应朋友要求,把Launcher应用再详细解说一下。
首先,我们需要去LauncherApplication里面看一下,因为这里没有两个成员变量对我们这一讲非常重要,它们就是
public LauncherModel mModel; public IconCache mIconCache;
在LauncherApplication的onCreate()创建
mIconCache = new IconCache(this); mModel = new LauncherModel(this, mIconCache);
IconCache很明显是应用Icon缓存,这个一会我们会讲到,LauncherModel是BroadcastReceiver,用来接受应用添加、删除、变动等等的广播,来做响应的操作。我们去LauncherModel的构造函数中看看
LauncherModel(LauncherApplication app, IconCache iconCache) { mAppsCanBeOnExternalStorage = !Environment.isExternalStorageEmulated(); mApp = app; mAllAppsList = new AllAppsList(iconCache); mIconCache = iconCache; mDefaultIcon = Utilities.createIconBitmap( mIconCache.getFullResDefaultActivityIcon(), app); final Resources res = app.getResources(); mAllAppsLoadDelay = res.getInteger(R.integer.config_allAppsBatchLoadDelay); mBatchSize = res.getInteger(R.integer.config_allAppsBatchSize); Configuration config = res.getConfiguration(); mPreviousConfigMcc = config.mcc; }
这里的mAllAppsList也就是AllAppsList,是用来存储我们应用信息的,十分重要,我们Launcher的一半操作是围绕这它进行的,在AllAppsList类中的重要变量
/** The list off all apps. */ public ArrayList<ApplicationInfo> data = new ArrayList<ApplicationInfo>(DEFAULT_APPLICATIONS_NUMBER); /** The list of apps that have been added since the last notify() call. */ public ArrayList<ApplicationInfo> added = new ArrayList<ApplicationInfo>(DEFAULT_APPLICATIONS_NUMBER); /** The list of apps that have been removed since the last notify() call. */ public ArrayList<ApplicationInfo> removed = new ArrayList<ApplicationInfo>(); /** The list of apps that have been modified since the last notify() call. */ public ArrayList<ApplicationInfo> modified = new ArrayList<ApplicationInfo>(); private IconCache mIconCache;
从名字就可以知道这些是用来存储什么的,这里不再一一解释,我们看看ApplicationInfo里面都存储了应用的什么信息
/** * The application name. */ CharSequence title; /** * The intent used to start the application. */ Intent intent; /** * A bitmap version of the application icon. */ Bitmap iconBitmap; /** * The time at which the app was first installed. */ long firstInstallTime; ComponentName componentName;
名字title、启动的Intent、iconBitmap、第一次安装时间firstInstallTime、ComponentName等等,具体这些干什么的,不用我一一解释了吧。
好了,LauncherApplication我们就看到这里,然后我们进入Launcher中,Launcher是一个Activity,所以我们就先看它的onCreate函数,我们只截取我们关心的代码
LauncherApplication app = ((LauncherApplication)getApplication()); mModel = app.setLauncher(this); mIconCache = app.getIconCache(); mDragController = new DragController(this);
这里获取我们刚才创建的LauncherApplication,然后获取到刚才创建的LauncherModel并把我们的Launcher传进去,接着获取到我们刚才创建的IconCache,最后就是创建DragController,这是我们拖动图标时用到的,后面会讲解到。由于Widget的管理和app差不多,这里就不再讲解只讲app。接着
if (!mRestoring) { mModel.startLoader(this, true); }
去加载我们的应用
public void startLoader(Context context, boolean isLaunching) { synchronized (mLock) { if (DEBUG_LOADERS) { Log.d(TAG, "startLoader isLaunching=" + isLaunching); } // Don‘t bother to start the thread if we know it‘s not going to do anything if (mCallbacks != null && mCallbacks.get() != null) { // If there is already one running, tell it to stop. // also, don‘t downgrade isLaunching if we‘re already running isLaunching = isLaunching || stopLoaderLocked(); mLoaderTask = new LoaderTask(context, isLaunching); sWorkerThread.setPriority(Thread.NORM_PRIORITY); sWorker.post(mLoaderTask); } } }
启动了一个线程LoaderTask来加载我们的应用,我们直接去LoaderTask的run()方法中查看
keep_running: { // Elevate priority when Home launches for the first time to avoid // starving at boot time. Staring at a blank home is not cool. synchronized (mLock) { if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to " + (mIsLaunching ? "DEFAULT" : "BACKGROUND")); android.os.Process.setThreadPriority(mIsLaunching ? Process.THREAD_PRIORITY_DEFAULT : Process.THREAD_PRIORITY_BACKGROUND); } if (loadWorkspaceFirst) { if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace"); loadAndBindWorkspace(); } else { if (DEBUG_LOADERS) Log.d(TAG, "step 1: special: loading all apps"); loadAndBindAllApps(); } if (mStopped) { break keep_running; } // Whew! Hard work done. Slow us down, and wait until the UI thread has // settled down. synchronized (mLock) { if (mIsLaunching) { if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to BACKGROUND"); android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); } } waitForIdle(); // second step if (loadWorkspaceFirst) { if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps"); loadAndBindAllApps(); } else { if (DEBUG_LOADERS) Log.d(TAG, "step 2: special: loading workspace"); loadAndBindWorkspace(); } // Restore the default thread priority after we are done loading items synchronized (mLock) { android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT); } }
这里就决定了是先加载Apps还是先加载Workspace,这只我们只讲解Apps,也就是loadAndBindAllApps()
private void loadAndBindAllApps() { if (DEBUG_LOADERS) { Log.d(TAG, "loadAndBindAllApps mAllAppsLoaded=" + mAllAppsLoaded); } if (!mAllAppsLoaded) { loadAllAppsFromPersistence(); loadAllAppsByBatch(); synchronized (LoaderTask.this) { if (mStopped) { return; } mAllAppsLoaded = true; } } else { onlyBindAllApps(); } }
loadAllAppsFromPersistence()是从数据库加载应用,由于代码不同,可能有的没有这一过程,loadAllAppsByBatch()解析应用来加载应用,onlyBindAllApps()跳过了更新应用列表的过程,是loadAllAppsByBatch()的部分代码,不再讲解,这里我们只讲解loadAllAppsByBatch()
private void loadAllAppsByBatch() { final long t = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0; // Don‘t use these two variables in any of the callback runnables. // Otherwise we hold a reference to them. final Callbacks oldCallbacks = mCallbacks.get(); if (oldCallbacks == null) { // This launcher has exited and nobody bothered to tell us. Just bail. Log.w(TAG, "LoaderTask running with no launcher (loadAllAppsByBatch)"); return; } final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); final PackageManager packageManager = mContext.getPackageManager(); List<ResolveInfo> apps = null; int N = Integer.MAX_VALUE; int startIndex; int i=0; int batchSize = -1; while (i < N && !mStopped) { if (i == 0) { mAllAppsList.clear(); final long qiaTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0; apps = packageManager.queryIntentActivities(mainIntent, 0); // for (ResolveInfo resolveInfo : apps) { // ActivityInfo activityInfo = resolveInfo.activityInfo; // if(activityInfo == null){ // Log.v("Launcher", "loadAllAppsByBatch resolvePackageName:" + resolveInfo.resolvePackageName); // }else{ // Log.v("Launcher", "loadAllAppsByBatch activityInfo:" + activityInfo.loadLabel(packageManager).toString()); // } // } if (DEBUG_LOADERS) { Log.d(TAG, "queryIntentActivities took " + (SystemClock.uptimeMillis()-qiaTime) + "ms"); } if (apps == null) { return; } N = apps.size(); if (DEBUG_LOADERS) { Log.d(TAG, "queryIntentActivities got " + N + " apps"); } if (N == 0) { // There are no apps?!? return; } if (mBatchSize == 0) { batchSize = N; } else { batchSize = mBatchSize; } final long sortTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0; Collections.sort(apps, new LauncherModel.ShortcutNameComparator(packageManager, mLabelCache)); if (DEBUG_LOADERS) { Log.d(TAG, "sort took " + (SystemClock.uptimeMillis()-sortTime) + "ms"); } } final long t2 = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0; startIndex = i; for (int j=0; i<N && j<batchSize; j++) { // This builds the icon bitmaps. mAllAppsList.add(new ApplicationInfo(packageManager, apps.get(i), mIconCache, mLabelCache)); i++; } final boolean first = i <= batchSize; final Callbacks callbacks = tryGetCallbacks(oldCallbacks); final ArrayList<ApplicationInfo> added = mAllAppsList.added; mAllAppsList.added = new ArrayList<ApplicationInfo>(); mHandler.post(new Runnable() { public void run() { final long t = SystemClock.uptimeMillis(); if (callbacks != null) { isNeedSave = true; if (first) { callbacks.bindAllApplications(added); } else { callbacks.bindAppsAdded(added); } if (DEBUG_LOADERS) { Log.d(TAG, "bound " + added.size() + " apps in " + (SystemClock.uptimeMillis() - t) + "ms"); } } else { Log.i(TAG, "not binding apps: no Launcher activity"); } } }); if (DEBUG_LOADERS) { Log.d(TAG, "batch of " + (i-startIndex) + " icons processed in " + (SystemClock.uptimeMillis()-t2) + "ms"); } if (mAllAppsLoadDelay > 0 && i < N) { try { if (DEBUG_LOADERS) { Log.d(TAG, "sleeping for " + mAllAppsLoadDelay + "ms"); } Thread.sleep(mAllAppsLoadDelay); } catch (InterruptedException exc) { } } } if (DEBUG_LOADERS) { Log.d(TAG, "cached all " + N + " apps in " + (SystemClock.uptimeMillis()-t) + "ms" + (mAllAppsLoadDelay > 0 ? " (including delay)" : "")); } }
首先获取Action为Intent.ACTION_MAIN,Category为Intent.CATEGORY_LAUNCHER的所有Apps
final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); final PackageManager packageManager = mContext.getPackageManager(); List<ResolveInfo> apps = null;
mAllAppsList.clear(); final long qiaTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0; apps = packageManager.queryIntentActivities(mainIntent, 0);
并且把我们mAllAppsList清空,这个mAllAppsList我们前面说过,这里不再赘述,然后
for (int j=0; i<N && j<batchSize; j++) { // This builds the icon bitmaps. mAllAppsList.add(new ApplicationInfo(packageManager, apps.get(i), mIconCache, mLabelCache)); i++; }
去加载我们的应用,ApplicationInfo之前我们也说过,但是前面只看了它存储了我们应用的什么信息,这里我们去看看它的构造函数
public ApplicationInfo(PackageManager pm, ResolveInfo info, IconCache iconCache, HashMap<Object, CharSequence> labelCache) { final String packageName = info.activityInfo.applicationInfo.packageName; this.componentName = new ComponentName(packageName, info.activityInfo.name); this.container = ItemInfo.NO_ID; this.setActivity(componentName, Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); try { int appFlags = pm.getApplicationInfo(packageName, 0).flags; if ((appFlags & android.content.pm.ApplicationInfo.FLAG_SYSTEM) == 0) { flags |= DOWNLOADED_FLAG; if ((appFlags & android.content.pm.ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) { flags |= UPDATED_SYSTEM_APP_FLAG; } } firstInstallTime = pm.getPackageInfo(packageName, 0).firstInstallTime; } catch (NameNotFoundException e) { Log.d(TAG, "PackageManager.getApplicationInfo failed for " + packageName); } iconCache.getTitleAndIcon(this, info, labelCache); }
首先,给ApplicationInfo中的componentName和container变量赋值,然后
this.setActivity(componentName, Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
也就是
final void setActivity(ComponentName className, int launchFlags) { intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_LAUNCHER); intent.setComponent(className); intent.setFlags(launchFlags); itemType = LauncherSettings.BaseLauncherColumns.ITEM_TYPE_APPLICATION; }
给ApplicationInfo的intent赋值,这里我们可以看出通过intent就可以启动我们相对应的应用了。接着就是给ApplicationInfo的flags和firstInstallTime赋值,这些都不再详细解说,我们详细看看iconCache.getTitleAndIcon(this, info, labelCache)也就是
public void getTitleAndIcon(ApplicationInfo application, ResolveInfo info, HashMap<Object, CharSequence> labelCache) { synchronized (mCache) { CacheEntry entry = cacheLocked(application.componentName, info, labelCache); application.title = entry.title; application.iconBitmap = createBitmap(application.componentName, entry.icon, application); } }
CacheEntry也就是
private static class CacheEntry { public Bitmap icon; public String title; }
只保存了应用的图标和名字。cacheLocked(application.componentName, info, labelCache)也就是
private CacheEntry cacheLocked(ComponentName componentName, ResolveInfo info, HashMap<Object, CharSequence> labelCache) { CacheEntry entry = mCache.get(componentName); if (entry == null) { entry = new CacheEntry(); mCache.put(componentName, entry); ComponentName key = LauncherModel.getComponentNameFromResolveInfo(info); if (labelCache != null && labelCache.containsKey(key)) { entry.title = labelCache.get(key).toString(); } else { entry.title = info.loadLabel(mPackageManager).toString(); if (labelCache != null) { labelCache.put(key, entry.title); } } if (entry.title == null) { entry.title = info.activityInfo.name; } entry.icon = Utilities.createIconBitmap( getFullResIcon(info), mContext); } return entry; }
首先从我们的缓存中获取,如果有就直接返回,如果没有就去获取。获取title也一样,先从缓存中获取,如果有就使用,如果没有就从应用的信息中获取,这里我们可以更改应用在Launcher中显示的名字,这些都容易理解,不做过多解释。接下来就是Icon的获取
entry.icon = Utilities.createIconBitmap( getFullResIcon(info), mContext);
我们看看getFullResIcon也就是
public Drawable getFullResIcon(ResolveInfo info) { Resources resources; try { resources = mPackageManager.getResourcesForApplication( info.activityInfo.applicationInfo); } catch (PackageManager.NameNotFoundException e) { resources = null; } if (resources != null) { int iconId = info.activityInfo.getIconResource(); if (iconId != 0) { return getFullResIcon(resources, iconId); } } return getFullResDefaultActivityIcon(); }
首先获取到我们加载应用的资源信息
resources = mPackageManager.getResourcesForApplication( info.activityInfo.applicationInfo);
如果获取资源不成功就返回getFullResDefaultActivityIcon(),如果获取资源成功
if (resources != null) { int iconId = info.activityInfo.getIconResource(); if (iconId != 0) { return getFullResIcon(resources, iconId); } }
就得到相应应用图标的ID,然后返回getFullResIcon也就是
public Drawable getFullResIcon(Resources resources, int iconId) { Drawable d; try { d = resources.getDrawableForDensity(iconId, mIconDpi); } catch (Resources.NotFoundException e) { d = null; } return (d != null) ? d : getFullResDefaultActivityIcon(); }
通过图标的ID获取到图片Drawable返回,如果获取图片不成功同样返回getFullResDefaultActivityIcon(),也就是
public Drawable getFullResDefaultActivityIcon() { return getFullResIcon(Resources.getSystem(), com.android.internal.R.mipmap.sym_def_app_icon); }
这个资源是我们framework下面的一张图片,也就是我们经常见的那个android小人人,可能不同代码这个图片有改动。如果想要把Launcher的图标改成我们想要的就可在这部分动手脚了,例如我们获取到一个我们准备好的图片,然后返回就可以了,这些不再多讲。现在回到cacheLocked中,还看
entry.icon = Utilities.createIconBitmap( getFullResIcon(info), mContext);
这句话,刚才我们分析了getFullResIcon(info)返回一个Drawable,现在我们看看Utilities.createIconBitmap,Utilities.createIconBitmap是一个重构函数,一个传进去Bitmap,一个传进去Drawable,我们看传进去Drawable的函数
static Bitmap createIconBitmap(Drawable icon, Context context) { synchronized (sCanvas) { // we share the statics :-( if (sIconWidth == -1) { initStatics(context); } int width = sIconWidth; int height = sIconHeight; if (icon instanceof PaintDrawable) { PaintDrawable painter = (PaintDrawable) icon; painter.setIntrinsicWidth(width); painter.setIntrinsicHeight(height); } else if (icon instanceof BitmapDrawable) { // Ensure the bitmap has a density. BitmapDrawable bitmapDrawable = (BitmapDrawable) icon; Bitmap bitmap = bitmapDrawable.getBitmap(); if (bitmap.getDensity() == Bitmap.DENSITY_NONE) { bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics()); } } int sourceWidth = icon.getIntrinsicWidth(); int sourceHeight = icon.getIntrinsicHeight(); if (sourceWidth > 0 && sourceHeight > 0) { // There are intrinsic sizes. if (width < sourceWidth || height < sourceHeight) { // It‘s too big, scale it down. final float ratio = (float) sourceWidth / sourceHeight; if (sourceWidth > sourceHeight) { height = (int) (width / ratio); } else if (sourceHeight > sourceWidth) { width = (int) (height * ratio); } } else if (sourceWidth < width && sourceHeight < height) { // Don‘t scale up the icon width = sourceWidth; height = sourceHeight; } } // no intrinsic size --> use default size int textureWidth = sIconTextureWidth; int textureHeight = sIconTextureHeight; final Bitmap bitmap = Bitmap.createBitmap(textureWidth, textureHeight, Bitmap.Config.ARGB_8888); final Canvas canvas = sCanvas; canvas.setBitmap(bitmap); final int left = (textureWidth-width) / 2; final int top = (textureHeight-height) / 2; if (false) { // draw a big box for the icon for debugging canvas.drawColor(sColors[sColorIndex]); if (++sColorIndex >= sColors.length) sColorIndex = 0; Paint debugPaint = new Paint(); debugPaint.setColor(0xffcccc00); canvas.drawRect(left, top, left+width, top+height, debugPaint); } sOldBounds.set(icon.getBounds()); icon.setBounds(left, top, left+width, top+height); icon.draw(canvas); icon.setBounds(sOldBounds); canvas.setBitmap(null); return bitmap; } }
很明显在这里对图片大小等做了修整吧,如果要控制Launcher图标显示就在这里做手脚吧,如可以添加一个背景图片什么的,或显示大小什么的,不再多说。然后我们回到getTitleAndIcon,接着看
application.title = entry.title; application.iconBitmap = createBitmap(application.componentName, entry.icon, application);
就是给我们的ApplicationInfo中的title和iconBitmap赋值了。这里有疑问了?我们的图标图片不是已经做好了,这里怎么又createBitmap呢?我们去看看
public Bitmap createBitmap(ComponentName componentName, Bitmap bitmap, ApplicationInfo application) { if (!componentName.getPackageName().equals("com.android.mms")) { return bitmap; } //return the Bitmap with unRead Tip return MessageManager.getInstance(mContext).createMmsBitmap(bitmap, application); }
这下我们恍然大悟了吧,这是在做什么呢?是在把我们未读短信的个数显示在图标上,明白了吧。如果我们要把未接电话的个数显示在图片上就可以在这里动手脚了,至于怎么获取到未读短信,未接电话个数的,怎么把数字做到图片上的,这些都是学习android的必备知识,不在详细解说。不懂的可以顺这代码看看就知道了。到此我们一个应用的ApplicationInfo制作完成了。然后就是循环的问题了,我们回到LauncherModel中loadAllAppsByBatch继续看
for (int j=0; i<N && j<batchSize; j++) { // This builds the icon bitmaps. mAllAppsList.add(new ApplicationInfo(packageManager, apps.get(i), mIconCache, mLabelCache)); i++; }
刚才我们用了大量的篇幅讲解了制作一个ApplicationInfo的过程,希望大家都能明白。接着我们看看mAllAppsList.add也就是
public void add(ApplicationInfo info) { if (findActivity(data, info.componentName)) { return; } data.add(info); added.add(info); }
把我们制作好的ApplicationInfo给了AllAppsList的data和added这两个我们前面说过,这里不再多说。继续看LauncherModel中loadAllAppsByBatch后面的内容
final boolean first = i <= batchSize; final Callbacks callbacks = tryGetCallbacks(oldCallbacks); final ArrayList<ApplicationInfo> added = mAllAppsList.added; mAllAppsList.added = new ArrayList<ApplicationInfo>(); mHandler.post(new Runnable() { public void run() { final long t = SystemClock.uptimeMillis(); if (callbacks != null) { isNeedSave = true; if (first) { callbacks.bindAllApplications(added); } else { callbacks.bindAppsAdded(added); } if (DEBUG_LOADERS) { Log.d(TAG, "bound " + added.size() + " apps in " + (SystemClock.uptimeMillis() - t) + "ms"); } } else { Log.i(TAG, "not binding apps: no Launcher activity"); } } });
把我们的mAllAppsList.added给了一个新申请的ArrayList<ApplicationInfo>也就是added,然后把我们的mAllAppsList.added重新申请,置空。最后又启动了一个线程来加载和显示我们的应用了,也就是
if (first) { callbacks.bindAllApplications(added); } else { callbacks.bindAppsAdded(added); }
这两个差不多,最终走向一样,我们只看一个bindAllApplications,bindAllApplications是在Launcher中实现的
public void bindAllApplications(final ArrayList<ApplicationInfo> apps) { // Remove the progress bar entirely; we could also make it GONE // but better to remove it since we know it‘s not going to be used View progressBar = mAppsCustomizeTabHost. findViewById(R.id.apps_customize_progress_bar); if (progressBar != null) { ((ViewGroup)progressBar.getParent()).removeView(progressBar); } if (LOGD) Log.d(TAG, "bindAllApplications " + apps.toString()); // We just post the call to setApps so the user sees the progress bar // disappear-- otherwise, it just looks like the progress bar froze // which doesn‘t look great mAppsCustomizeTabHost.post(new Runnable() { public void run() { if (mAppsCustomizeContent != null) { mAppsCustomizeContent.setApps(apps); } } }); }
这里出现两个布局mAppsCustomizeTabHost和mAppsCustomizeContent,这里插个小曲,来说一下Launcher布局,我们不从最底层说起,我们从DragLayout这层说起,顾名思义是拖动层了,这一层包含AppsCustomizeTabHost也就是主菜单,Hotseat最下面的那一行应用图标,Workspace就是待机界面了等等吧,其它不重要的就不说了。接着说说Workspace,Workspace包含很多CellLayout,CellLayout就是我们在待机左右滑动时的页,CellLayout又包含CellLayoutChildren,CellLayoutChildren包含许多LauncherAppWidgetHostView接下来就是我们的Widget了,CellLayoutChildren还包含BubbleTextView,就是我们的App图标了,这就是Workspace的构造。接着说说主菜单,也就是AppsCustomizeTabHost,AppsCustomizeTabHost之上有很多层,不再解释,直接到AppsCustomizePagedView层,AppsCustomizePagedView包含很多PagedViewCellLayout,PagedViewCellLayout就是我们在主菜单左右滑动出现的页了,PagedViewCellLayout之上是PagedViewCellLayoutChildren,PagedViewCellLayoutChildren包含很多PagedViewIcon也就是我们的应用图标。这样我们就清楚了Launcher的大致布局了。好了,我们接着说mAppsCustomizeTabHost和mAppsCustomizeContent,这两个也就是AppsCustomizeTabHost和AppsCustomizePagedView,通过上面的解释可以明白它们之间的关系了,我们这里要加载应用,就是去AppsCustomizePagedView中加载了,也就是mAppsCustomizeContent.setApps(apps)了
public void setApps(ArrayList<ApplicationInfo> list) { mApps = list; Collections.sort(mApps, LauncherModel.APP_NAME_COMPARATOR); updatePageCounts(); // The next layout pass will trigger data-ready if both widgets and apps are set, so // request a layout to do this test and invalidate the page data when ready. LauncherModel.cacheAllApp(mContext, mApps); if (testDataReady()) requestLayout(); invalidatePageData(); }
首先重新计算我们的page页个数
private void updatePageCounts() { mNumWidgetPages = (int) Math.ceil(mWidgets.size() / (float) (mWidgetCountX * mWidgetCountY)); mNumAppsPages = (int) Math.ceil((float) mApps.size() / (mCellCountX * mCellCountY)); }
接着备份我们的应用信息到数据库LauncherModel.cacheAllApp(mContext, mApps),也就我们前面说的从数据库加载应用的过程,由于代码不同,有的代码没有这一部分,所以不做讲解,好处就是开机加载应用图标比较快。然后就是更新我们布局,就可以把我们的应用显示出来了。而invalidatePageData()是什么呢?就是Launcher页面都放满了图标,就新增一页,来放图标,最终还是通过requestLayout()来从新分布布局刷新显示了。至此我们的图标就显示出来了。
接着我们说说当点击图标的时候怎样启动应用的。这个分为两个,一个是点击主菜单图标,一个点击待机图标。我么先说点击待机图标也就是Workspace图标,这个事件响应再Launcher中,也就是
public void onClick(View v) { // Make sure that rogue clicks don‘t get through while allapps is launching, or after the // view has detached (it‘s possible for this to happen if the view is removed mid touch). if (v.getWindowToken() == null) { return; } if (mWorkspace.isSwitchingState()) { return; } Object tag = v.getTag(); if (tag instanceof ShortcutInfo) { // Open shortcut final Intent intent = ((ShortcutInfo) tag).intent; int[] pos = new int[2]; v.getLocationOnScreen(pos); intent.setSourceBounds(new Rect(pos[0], pos[1], pos[0] + v.getWidth(), pos[1] + v.getHeight())); boolean success = startActivitySafely(intent, tag); if (success && v instanceof BubbleTextView) { mWaitingForResume = (BubbleTextView) v; mWaitingForResume.setStayPressed(true); } } else if (tag instanceof FolderInfo) { if (v instanceof FolderIcon) { FolderIcon fi = (FolderIcon) v; handleFolderClick(fi); } } else if (v == mAllAppsButton) { if (mState == State.APPS_CUSTOMIZE) { showWorkspace(true); } else { onClickAllAppsButton(v); } } }
先说一下ShortcutInfo,ShortcutInfo的信息是从ApplicationInfo信息中获取的,至于是怎么获取,这里就不再解释,童鞋们可以自己研究。所以这里的((ShortcutInfo) tag).intent信息大家就很明白了,是可以启动一个应用的,前面说过,不再解释。至于下面的FolderInfo就是点击文件夹时做了什么,这里不讲解了,自己研究。然后看看主菜单点击时是如何启动应用的,这部分在AppsCustomizePagedView中
public void onClick(View v) { // When we have exited all apps or are in transition, disregard clicks if (!mLauncher.isAllAppsCustomizeOpen() || mLauncher.getWorkspace().isSwitchingState()) return; if (v instanceof PagedViewIcon) { // Animate some feedback to the click final ApplicationInfo appInfo = (ApplicationInfo) v.getTag(); // bug 211336 begin //if (OptConfig.LC_RAM_SUPPORT) { // remove the animation when click mLauncher.startActivitySafely(appInfo.intent, appInfo); //} else { // animateClickFeedback(v, new Runnable() { // @Override // public void run() { // mLauncher.startActivitySafely(appInfo.intent, appInfo); // } // }); //} // bug 211336 end } else if (v instanceof PagedViewWidget) { // Let the user know that they have to long press to add a widget Toast.makeText(getContext(), R.string.long_press_widget_to_add, Toast.LENGTH_SHORT).show(); // Create a little animation to show that the widget can move float offsetY = getResources().getDimensionPixelSize(R.dimen.dragViewOffsetY); final ImageView p = (ImageView) v.findViewById(R.id.widget_preview); AnimatorSet bounce = new AnimatorSet(); ValueAnimator tyuAnim = ObjectAnimator.ofFloat(p, "translationY", offsetY); tyuAnim.setDuration(125); ValueAnimator tydAnim = ObjectAnimator.ofFloat(p, "translationY", 0f); tydAnim.setDuration(100); bounce.play(tyuAnim).before(tydAnim); bounce.setInterpolator(new AccelerateInterpolator()); bounce.start(); } }
两部分,一部分是点击主菜单图标,一部分是点击Widget,也就是长按Widget添加到Workspace待机,这里只说点击主菜单图标也就是PagedViewIcon,单点击PagedViewIcon的时候就会获取到响应的ApplicationInfo信息,通过ApplicationInfo的intent来启动一个应用是完全可以的,这个我们前面已经强调过很多次了。
点击图标启动应用就讲这么多,不再多讲,接下来我们说说拖动图标或者widget。当我们长按时就可以从待机移动图标或widget,还可一从主菜单把图标或widget移动到待机,这个过程是怎么一回事呢?这里做一下讲解。先说在workspace待机拖动图标,我们从长按事件说起,这个在Launcher中
public boolean onLongClick(View v) { if (mState != State.WORKSPACE) { return false; } if (isWorkspaceLocked()) { return false; } if (!(v instanceof CellLayout)) { v = (View) v.getParent().getParent(); } resetAddInfo(); CellLayout.CellInfo longClickCellInfo = (CellLayout.CellInfo) v.getTag(); // This happens when long clicking an item with the dpad/trackball if (longClickCellInfo == null) { return true; } // The hotseat touch handling does not go through Workspace, and we always allow long press // on hotseat items. final View itemUnderLongClick = longClickCellInfo.cell; boolean allowLongPress = isHotseatLayout(v) || mWorkspace.allowLongPress(); if (allowLongPress && !mDragController.isDragging()) { if (itemUnderLongClick == null) { // User long pressed on empty space mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS, HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING); startWallpaper(); } else { if (!(itemUnderLongClick instanceof Folder)) { // User long pressed on an item mWorkspace.startDrag(longClickCellInfo); } } } return true; }
也就是mWorkspace.startDrag(longClickCellInfo)其它内容不做讲解,感兴趣可以看看。mWorkspace.startDrag(longClickCellInfo)也就是
void startDrag(CellLayout.CellInfo cellInfo) { View child = cellInfo.cell; // Make sure the drag was started by a long press as opposed to a long click. if (!child.isInTouchMode()) { return; } mDragInfo = cellInfo; child.setVisibility(GONE); child.clearFocus(); child.setPressed(false); final Canvas canvas = new Canvas(); // We need to add extra padding to the bitmap to make room for the glow effect final int bitmapPadding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS; // The outline is used to visualize where the item will land if dropped mDragOutline = createDragOutline(child, canvas, bitmapPadding); beginDragShared(child, this); }
创建一个Bitmap为mDragOutline这个mDragOutline保存的是原始的图片,等到UP的时候也就是松手的时候会用到。然后就是beginDragShared也就是
public void beginDragShared(View child, DragSource source) { Resources r = getResources(); // We need to add extra padding to the bitmap to make room for the glow effect final int bitmapPadding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS; // The drag bitmap follows the touch point around on the screen final Bitmap b = createDragBitmap(child, new Canvas(), bitmapPadding); final int bmpWidth = b.getWidth(); mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY); final int dragLayerX = (int) mTempXY[0] + (child.getWidth() - bmpWidth) / 2; int dragLayerY = mTempXY[1] - bitmapPadding / 2; Point dragVisualizeOffset = null; Rect dragRect = null; if (child instanceof BubbleTextView || child instanceof PagedViewIcon) { int iconSize = r.getDimensionPixelSize(R.dimen.app_icon_size); int iconPaddingTop = r.getDimensionPixelSize(R.dimen.app_icon_padding_top); int top = child.getPaddingTop(); int left = (bmpWidth - iconSize) / 2; int right = left + iconSize; int bottom = top + iconSize; dragLayerY += top; // Note: The drag region is used to calculate drag layer offsets, but the // dragVisualizeOffset in addition to the dragRect (the size) to position the outline. dragVisualizeOffset = new Point(-bitmapPadding / 2, iconPaddingTop - bitmapPadding / 2); dragRect = new Rect(left, top, right, bottom); } else if (child instanceof FolderIcon) { int previewSize = r.getDimensionPixelSize(R.dimen.folder_preview_size); dragRect = new Rect(0, 0, child.getWidth(), previewSize); } // Clear the pressed state if necessary if (child instanceof BubbleTextView) { BubbleTextView icon = (BubbleTextView) child; icon.clearPressedOrFocusedBackground(); } mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(), DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect); b.recycle(); }
创建一个拖动的Bitmap这个和刚才的mDragOutline不同,这个Bitmap透明度、大小等等有变化的。然后就是
mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(), DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect);
也就是
public void startDrag(Bitmap b, int dragLayerX, int dragLayerY, DragSource source, Object dragInfo, int dragAction, Point dragOffset, Rect dragRegion) { if (PROFILE_DRAWING_DURING_DRAG) { android.os.Debug.startMethodTracing("Launcher"); } // Hide soft keyboard, if visible if (mInputMethodManager == null) { mInputMethodManager = (InputMethodManager) mLauncher.getSystemService(Context.INPUT_METHOD_SERVICE); } mInputMethodManager.hideSoftInputFromWindow(mWindowToken, 0); for (DragListener listener : mListeners) { listener.onDragStart(source, dragInfo, dragAction); } final int registrationX = mMotionDownX - dragLayerX; final int registrationY = mMotionDownY - dragLayerY; final int dragRegionLeft = dragRegion == null ? 0 : dragRegion.left; final int dragRegionTop = dragRegion == null ? 0 : dragRegion.top; mDragging = true; mDragObject = new DropTarget.DragObject(); mDragObject.dragComplete = false; mDragObject.xOffset = mMotionDownX - (dragLayerX + dragRegionLeft); mDragObject.yOffset = mMotionDownY - (dragLayerY + dragRegionTop); mDragObject.dragSource = source; mDragObject.dragInfo = dragInfo; mVibrator.vibrate(VIBRATE_DURATION); final DragView dragView = mDragObject.dragView = new DragView(mLauncher, b, registrationX, registrationY, 0, 0, b.getWidth(), b.getHeight()); if (dragOffset != null) { dragView.setDragVisualizeOffset(new Point(dragOffset)); } if (dragRegion != null) { dragView.setDragRegion(new Rect(dragRegion)); } dragView.show(mMotionDownX, mMotionDownY); handleMoveEvent(mMotionDownX, mMotionDownY); }
创建一个DragView然后显示dragView.show,长按的时候会震动一下也就是在这里mVibrator.vibrate(VIBRATE_DURATION),最终handleMoveEvent(mMotionDownX, mMotionDownY)也就是
private void handleMoveEvent(int x, int y) { mDragObject.dragView.move(x, y); // Drop on someone? final int[] coordinates = mCoordinatesTemp; DropTarget dropTarget = findDropTarget(x, y, coordinates); mDragObject.x = coordinates[0]; mDragObject.y = coordinates[1]; if (dropTarget != null) { DropTarget delegate = dropTarget.getDropTargetDelegate(mDragObject); if (delegate != null) { dropTarget = delegate; } if (mLastDropTarget != dropTarget) { if (mLastDropTarget != null) { mLastDropTarget.onDragExit(mDragObject); } dropTarget.onDragEnter(mDragObject); } dropTarget.onDragOver(mDragObject); } else { if (mLastDropTarget != null) { mLastDropTarget.onDragExit(mDragObject); } } mLastDropTarget = dropTarget; // After a scroll, the touch point will still be in the scroll region. // Rather than scrolling immediately, require a bit of twiddling to scroll again final int slop = ViewConfiguration.get(mLauncher).getScaledWindowTouchSlop(); mDistanceSinceScroll += Math.sqrt(Math.pow(mLastTouch[0] - x, 2) + Math.pow(mLastTouch[1] - y, 2)); mLastTouch[0] = x; mLastTouch[1] = y; if (x < mScrollZone) { if (mScrollState == SCROLL_OUTSIDE_ZONE && mDistanceSinceScroll > slop) { mScrollState = SCROLL_WAITING_IN_ZONE; if (mDragScroller.onEnterScrollArea(x, y, SCROLL_LEFT)) { mScrollRunnable.setDirection(SCROLL_LEFT); mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY); } } } else if (x > mScrollView.getWidth() - mScrollZone) { if (mScrollState == SCROLL_OUTSIDE_ZONE && mDistanceSinceScroll > slop) { mScrollState = SCROLL_WAITING_IN_ZONE; if (mDragScroller.onEnterScrollArea(x, y, SCROLL_RIGHT)) { mScrollRunnable.setDirection(SCROLL_RIGHT); mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY); } } } else { if (mScrollState == SCROLL_WAITING_IN_ZONE) { mScrollState = SCROLL_OUTSIDE_ZONE; mScrollRunnable.setDirection(SCROLL_RIGHT); mHandler.removeCallbacks(mScrollRunnable); mDragScroller.onExitScrollArea(); } } }
当开始拖动的时候也就开始分发ACTION_MOVE消息,也就是
public boolean onTouchEvent(MotionEvent ev) { if (!mDragging) { return false; } final int action = ev.getAction(); final int[] dragLayerPos = getClampedDragLayerPos(ev.getX(), ev.getY()); final int dragLayerX = dragLayerPos[0]; final int dragLayerY = dragLayerPos[1]; switch (action) { case MotionEvent.ACTION_DOWN: // Remember where the motion event started mMotionDownX = dragLayerX; mMotionDownY = dragLayerY; if ((dragLayerX < mScrollZone) || (dragLayerX > mScrollView.getWidth() - mScrollZone)) { mScrollState = SCROLL_WAITING_IN_ZONE; mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY); } else { mScrollState = SCROLL_OUTSIDE_ZONE; } break; case MotionEvent.ACTION_MOVE: handleMoveEvent(dragLayerX, dragLayerY); break; case MotionEvent.ACTION_UP: // Ensure that we‘ve processed a move event at the current pointer location. handleMoveEvent(dragLayerX, dragLayerY); mHandler.removeCallbacks(mScrollRunnable); if (mDragging) { drop(dragLayerX, dragLayerY); } endDrag(); break; case MotionEvent.ACTION_CANCEL: cancelDrag(); break; } return true; }
这里的MotionEvent.ACTION_MOVE消息,一直重复handleMoveEvent,当松手的时候就是MotionEvent.ACTION_UP了。我们还先回到handleMoveEvent看看
mDragObject.dragView.move(x, y);
这个就是拖动的过程了,也就是
void move(int touchX, int touchY) { DragLayer.LayoutParams lp = mLayoutParams; lp.x = touchX - mRegistrationX + (int) mOffsetX; lp.y = touchY - mRegistrationY + (int) mOffsetY; mDragLayer.requestLayout(); }
一直更改坐标,然后更新。然后还回到handleMoveEvent下面的内容是什么呢?大致解释一下不再深入解析,就是当drop也就是UP松手时做的一下事情,和当移动到边缘时切换到下一页,这些不再讲解。然后我们回到MotionEvent.ACTION_UP消息,也就是
handleMoveEvent(dragLayerX, dragLayerY); mHandler.removeCallbacks(mScrollRunnable); if (mDragging) { drop(dragLayerX, dragLayerY); } endDrag();
handleMoveEvent我们刚才已经说过了,endDrag()时拖动结束释放资源,我们单看drop(dragLayerX, dragLayerY)也就是
private void drop(float x, float y) { final int[] coordinates = mCoordinatesTemp; final DropTarget dropTarget = findDropTarget((int) x, (int) y, coordinates); mDragObject.x = coordinates[0]; mDragObject.y = coordinates[1]; boolean accepted = false; if (dropTarget != null) { mDragObject.dragComplete = true; dropTarget.onDragExit(mDragObject); if (dropTarget.acceptDrop(mDragObject)) { dropTarget.onDrop(mDragObject); accepted = true; } } mDragObject.dragSource.onDropCompleted((View) dropTarget, mDragObject, accepted); }
也就是dropTarget.onDrop(mDragObject),其它内容不做详解,都是放松手后做了一些处理,我们只看看dropTarget.onDrop(mDragObject),DropTarget是个接口,在Workspace中实现
public void onDrop(DragObject d) { mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset, d.dragView, mDragViewVisualCenter); // We want the point to be mapped to the dragTarget. if (mDragTargetLayout != null) { if (mLauncher.isHotseatLayout(mDragTargetLayout)) { mapPointFromSelfToSibling(mLauncher.getHotseat(), mDragViewVisualCenter); } else { mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter, null); } } CellLayout dropTargetLayout = mDragTargetLayout; int snapScreen = -1; if (d.dragSource != this) { final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1] }; onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d); } else if (mDragInfo != null) { final View cell = mDragInfo.cell; if (dropTargetLayout != null) { // Move internally boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout); boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout); long container = hasMovedIntoHotseat ? LauncherSettings.Favorites.CONTAINER_HOTSEAT : LauncherSettings.Favorites.CONTAINER_DESKTOP; int screen = (mTargetCell[0] < 0) ? mDragInfo.screen : indexOfChild(dropTargetLayout); int spanX = mDragInfo != null ? mDragInfo.spanX : 1; int spanY = mDragInfo != null ? mDragInfo.spanY : 1; // First we find the cell nearest to point at which the item is // dropped, without any consideration to whether there is an item there. mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell); // If the item being dropped is a shortcut and the nearest drop // cell also contains a shortcut, then create a folder with the two shortcuts. if (!mInScrollArea && createUserFolderIfNecessary(cell, container, dropTargetLayout, mTargetCell, false, d.dragView, null)) { return; } if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell, d, false)) { return; } // Aside from the special case where we‘re dropping a shortcut onto a shortcut, // we need to find the nearest cell location that is vacant mTargetCell = findNearestVacantArea((int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], mDragInfo.spanX, mDragInfo.spanY, cell, dropTargetLayout, mTargetCell); if (mCurrentPage != screen && !hasMovedIntoHotseat) { snapScreen = screen; snapToPage(screen); } if (mTargetCell[0] >= 0 && mTargetCell[1] >= 0) { if (hasMovedLayouts) { // Reparent the view /* Modify 112809 Spreadst of 112809 Monkey start */ if(getParentCellLayoutForView(cell) != null){ getParentCellLayoutForView(cell).removeView(cell); }else{ Log.d(TAG,"this view not be added to CellLayout"); } addInScreen(cell, container, screen, mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY); } // update the item‘s position after drop final ItemInfo info = (ItemInfo) cell.getTag(); CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams(); dropTargetLayout.onMove(cell, mTargetCell[0], mTargetCell[1]); lp.cellX = mTargetCell[0]; lp.cellY = mTargetCell[1]; cell.setId(LauncherModel.getCellLayoutChildId(container, mDragInfo.screen, mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY)); if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT && cell instanceof LauncherAppWidgetHostView) { final CellLayout cellLayout = dropTargetLayout; // We post this call so that the widget has a chance to be placed // in its final location final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell; AppWidgetProviderInfo pinfo = hostView.getAppWidgetInfo(); if (pinfo != null && pinfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE) { final Runnable resizeRunnable = new Runnable() { public void run() { DragLayer dragLayer = mLauncher.getDragLayer(); dragLayer.addResizeFrame(info, hostView, cellLayout); } }; post(new Runnable() { public void run() { if (!isPageMoving()) { resizeRunnable.run(); } else { mDelayedResizeRunnable = resizeRunnable; } } }); } } ItemInfo modelItem = null; if(info != null) { modelItem = LauncherModel.sItemsIdMap.get(info.id); } if(modelItem == null){ /**Bug141020 Bug146476 start.if the item has been deleted from db ,such as stk1 ,stk2, * just return,if the item is Folder and there is no other Shorcut except stk1 ,stk2 * delete the Emputy Folder**/ if(cell instanceof FolderIcon){ FolderIcon folder= (FolderIcon)cell; ArrayList<View> folderItem = folder.mFolder.getItemsInReadingOrder(); if(folderItem.size() == 0){ getParentCellLayoutForView(cell).removeView(cell); } } return; } LauncherModel.moveItemInDatabase(mLauncher, info, container, screen, lp.cellX, lp.cellY); } } final CellLayout parent = (CellLayout) cell.getParent().getParent(); // Prepare it to be animated into its new position // This must be called after the view has been re-parented final Runnable disableHardwareLayersRunnable = new Runnable() { @Override public void run() { mAnimatingViewIntoPlace = false; updateChildrenLayersEnabled(); } }; mAnimatingViewIntoPlace = true; if (d.dragView.hasDrawn()) { int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION; setFinalScrollForPageChange(snapScreen); mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration, disableHardwareLayersRunnable); resetFinalScrollForPageChange(snapScreen); } else { cell.setVisibility(VISIBLE); } parent.onDropChild(cell); } }
这个函数比较大,就不一一解释了,大概说一下,分为三种情况,第一如果是从主菜单拖到workspace待机的走onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d)这里,如果是在workspace拖动的,分两种情况,一种就是没有把该图标拖到另外一页,就更新刷新就完了,如果拖到了下一页就走
addInScreen(cell, container, screen, mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY);
addInScreen也就是
void addInScreen(View child, long container, int screen, int x, int y, int spanX, int spanY, boolean insert) { if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) { if (screen < 0 || screen >= getChildCount()) { Log.e(TAG, "The screen must be >= 0 and < " + getChildCount() + " (was " + screen + "); skipping child"); return; } } final CellLayout layout; if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) { layout = mLauncher.getHotseat().getLayout(); child.setOnKeyListener(null); // Hide folder title in the hotseat if (child instanceof FolderIcon) { ((FolderIcon) child).setTextVisible(false); } if (screen < 0) { screen = mLauncher.getHotseat().getOrderInHotseat(x, y); } else { // Note: We do this to ensure that the hotseat is always laid out in the orientation // of the hotseat in order regardless of which orientation they were added x = mLauncher.getHotseat().getCellXFromOrder(screen); y = mLauncher.getHotseat().getCellYFromOrder(screen); } } else { // Show folder title if not in the hotseat if (child instanceof FolderIcon) { ((FolderIcon) child).setTextVisible(true); } layout = (CellLayout) getChildAt(screen); child.setOnKeyListener(new IconKeyEventListener()); } CellLayout.LayoutParams lp = (CellLayout.LayoutParams) child.getLayoutParams(); if (lp == null) { lp = new CellLayout.LayoutParams(x, y, spanX, spanY); } else { lp.cellX = x; lp.cellY = y; lp.cellHSpan = spanX; lp.cellVSpan = spanY; } if (spanX < 0 && spanY < 0) { lp.isLockedToGrid = false; } // Get the canonical child id to uniquely represent this view in this screen int childId = LauncherModel.getCellLayoutChildId(container, screen, x, y, spanX, spanY); boolean markCellsAsOccupied = !(child instanceof Folder); if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) { // TODO: This branch occurs when the workspace is adding views // outside of the defined grid // maybe we should be deleting these items from the LauncherModel? Log.w(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout"); } if (!(child instanceof Folder)) { child.setHapticFeedbackEnabled(false); child.setOnLongClickListener(mLongClickListener); } if (child instanceof DropTarget) { mDragController.addDropTarget((DropTarget) child); } }
这里做了一些计算,拖动的是什么,放在哪里等等吧,然后就layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)这里的layout是CellLayout所以layout.addViewToCellLayout也就是
public boolean addViewToCellLayout( View child, int index, int childId, LayoutParams params, boolean markCells) { final LayoutParams lp = params; // Generate an id for each view, this assumes we have at most 256x256 cells // per workspace screen if (lp.cellX >= 0 && lp.cellX <= mCountX - 1 && lp.cellY >= 0 && lp.cellY <= mCountY - 1) { // If the horizontal or vertical span is set to -1, it is taken to // mean that it spans the extent of the CellLayout if (lp.cellHSpan < 0) lp.cellHSpan = mCountX; if (lp.cellVSpan < 0) lp.cellVSpan = mCountY; child.setId(childId); mChildren.addView(child, index, lp); if (markCells) markCellsAsOccupiedForView(child); return true; } return false; }
也就是mChildren.addView(child, index, lp)了,这里的mChildren也就是CellLayoutChildren,CellLayoutChildren我们前面说过了,就不再说了,至此一个移动过程结束。现在我们回过头来看看如果是从主菜单拖到workspace待机是怎么一个过程,这个过程主要是从主菜单到workspace的转换过程,我们还是从长按事件开始,从主菜单长按事件应该在AppsCustomizePagedView里面,但是这里没有,我们去它的父类PagedViewWithDraggableItems中寻找,也就是
@Override public boolean onLongClick(View v) { // Return early if this is not initiated from a touch if (!v.isInTouchMode()) return false; // Return early if we are still animating the pages if (mNextPage != INVALID_PAGE) return false; // When we have exited all apps or are in transition, disregard long clicks if (!mLauncher.isAllAppsCustomizeOpen() || mLauncher.getWorkspace().isSwitchingState()) return false; return beginDragging(v); }
也就是beginDragging,beginDragging在其子类AppsCustomizePagedView中重写了,也就是
@Override protected boolean beginDragging(View v) { // Dismiss the cling mLauncher.dismissAllAppsCling(null); if (!super.beginDragging(v)) return false; // Go into spring loaded mode (must happen before we startDrag()) mLauncher.enterSpringLoadedDragMode(); if (v instanceof PagedViewIcon) { beginDraggingApplication(v); } else if (v instanceof PagedViewWidget) { beginDraggingWidget(v); } return true; }
mLauncher.enterSpringLoadedDragMode()是做什么的呢?就是隐藏主菜单,显示workspace待机,这样就从显示上切换到workspace了,但是实质还没切换到workspace,这个后面会讲到,然后就是区分开拖动的是PagedViewIcon(App图标),还是PagedViewWidget(widget图标)。这里我们只看App图标,也就是beginDraggingApplication(v)
private void beginDraggingApplication(View v) { mLauncher.getWorkspace().onDragStartedWithItem(v); mLauncher.getWorkspace().beginDragShared(v, this); }
这里就是实质上切换到workspace了,先看上面一句mLauncher.getWorkspace().onDragStartedWithItem(v)也就是
public void onDragStartedWithItem(View v) { final Canvas canvas = new Canvas(); // We need to add extra padding to the bitmap to make room for the glow effect final int bitmapPadding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS; // The outline is used to visualize where the item will land if dropped mDragOutline = createDragOutline(v, canvas, bitmapPadding); }
这里同样创建了一个Bitmap为mDragOutline,和刚才我们讲解workspace拖动一样啦,就不再说了,然后看看下句mLauncher.getWorkspace().beginDragShared(v, this)也就是
public void beginDragShared(View child, DragSource source) { Resources r = getResources(); // We need to add extra padding to the bitmap to make room for the glow effect final int bitmapPadding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS; // The drag bitmap follows the touch point around on the screen final Bitmap b = createDragBitmap(child, new Canvas(), bitmapPadding); final int bmpWidth = b.getWidth(); mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY); final int dragLayerX = (int) mTempXY[0] + (child.getWidth() - bmpWidth) / 2; int dragLayerY = mTempXY[1] - bitmapPadding / 2; Point dragVisualizeOffset = null; Rect dragRect = null; if (child instanceof BubbleTextView || child instanceof PagedViewIcon) { int iconSize = r.getDimensionPixelSize(R.dimen.app_icon_size); int iconPaddingTop = r.getDimensionPixelSize(R.dimen.app_icon_padding_top); int top = child.getPaddingTop(); int left = (bmpWidth - iconSize) / 2; int right = left + iconSize; int bottom = top + iconSize; dragLayerY += top; // Note: The drag region is used to calculate drag layer offsets, but the // dragVisualizeOffset in addition to the dragRect (the size) to position the outline. dragVisualizeOffset = new Point(-bitmapPadding / 2, iconPaddingTop - bitmapPadding / 2); dragRect = new Rect(left, top, right, bottom); } else if (child instanceof FolderIcon) { int previewSize = r.getDimensionPixelSize(R.dimen.folder_preview_size); dragRect = new Rect(0, 0, child.getWidth(), previewSize); } // Clear the pressed state if necessary if (child instanceof BubbleTextView) { BubbleTextView icon = (BubbleTextView) child; icon.clearPressedOrFocusedBackground(); } mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(), DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect); b.recycle(); }
又到了这里了,这个和刚才workspace拖动是一样的了,也不做解释了,然后就进入mDragController.startDrag再然后就是handleMoveEvent循环了,然后就是拖到适当位置MotionEvent.ACTION_UP消息了,然后就是drop,dropTarget.onDrop这些过程和workspace拖动过程都一样了,唯独到了Workspace的onDrop中不同,也就是我们前面提到的,当从主菜单托出图标是会走onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d)也就是
private void onDropExternal(final int[] touchXY, final Object dragInfo, final CellLayout cellLayout, boolean insertAtFirst, DragObject d) { final Runnable exitSpringLoadedRunnable = new Runnable() { @Override public void run() { mLauncher.exitSpringLoadedDragModeDelayed(true, false); } }; ItemInfo info = (ItemInfo) dragInfo; int spanX = info.spanX; int spanY = info.spanY; if (mDragInfo != null) { spanX = mDragInfo.spanX; spanY = mDragInfo.spanY; } final long container = mLauncher.isHotseatLayout(cellLayout) ? LauncherSettings.Favorites.CONTAINER_HOTSEAT : LauncherSettings.Favorites.CONTAINER_DESKTOP; final int screen = indexOfChild(cellLayout); if (!mLauncher.isHotseatLayout(cellLayout) && screen != mCurrentPage && mState != State.SPRING_LOADED) { snapToPage(screen); } if (info instanceof PendingAddItemInfo) { final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo; boolean findNearestVacantCell = true; if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) { mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY, cellLayout, mTargetCell); if (willCreateUserFolder((ItemInfo) d.dragInfo, mDragTargetLayout, mTargetCell, true) || willAddToExistingUserFolder((ItemInfo) d.dragInfo, mDragTargetLayout, mTargetCell)) { findNearestVacantCell = false; } } if (findNearestVacantCell) { mTargetCell = findNearestVacantArea(touchXY[0], touchXY[1], spanX, spanY, null, cellLayout, mTargetCell); } Runnable onAnimationCompleteRunnable = new Runnable() { @Override public void run() { // When dragging and dropping from customization tray, we deal with creating // widgets/shortcuts/folders in a slightly different way switch (pendingInfo.itemType) { case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET: mLauncher.addAppWidgetFromDrop((PendingAddWidgetInfo) pendingInfo, container, screen, mTargetCell, null); break; case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT: mLauncher.processShortcutFromDrop(pendingInfo.componentName, container, screen, mTargetCell, null); break; default: throw new IllegalStateException("Unknown item type: " + pendingInfo.itemType); } cellLayout.onDragExit(); } }; // Now we animate the dragView, (ie. the widget or shortcut preview) into its final // location and size on the home screen. RectF r = estimateItemPosition(cellLayout, pendingInfo, mTargetCell[0], mTargetCell[1], spanX, spanY); int loc[] = new int[2]; loc[0] = (int) r.left; loc[1] = (int) r.top; setFinalTransitionTransform(cellLayout); float cellLayoutScale = mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(cellLayout, loc); resetTransitionTransform(cellLayout); float dragViewScale = Math.min(r.width() / d.dragView.getMeasuredWidth(), r.height() / d.dragView.getMeasuredHeight()); // The animation will scale the dragView about its center, so we need to center about // the final location. loc[0] -= (d.dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2; loc[1] -= (d.dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2; mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, loc, dragViewScale * cellLayoutScale, onAnimationCompleteRunnable); } else { // This is for other drag/drop cases, like dragging from All Apps View view = null; switch (info.itemType) { case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION: case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT: if (info.container == NO_ID && info instanceof ApplicationInfo) { // Came from all apps -- make a copy info = new ShortcutInfo((ApplicationInfo) info); } view = mLauncher.createShortcut(R.layout.application, cellLayout, (ShortcutInfo) info); break; case LauncherSettings.Favorites.ITEM_TYPE_FOLDER: view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout, (FolderInfo) info, mIconCache); break; default: throw new IllegalStateException("Unknown item type: " + info.itemType); } // First we find the cell nearest to point at which the item is // dropped, without any consideration to whether there is an item there. if (touchXY != null) { mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY, cellLayout, mTargetCell); d.postAnimationRunnable = exitSpringLoadedRunnable; if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, true, d.dragView, d.postAnimationRunnable)) { return; } if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, d, true)) { return; } } if (touchXY != null) { // when dragging and dropping, just find the closest free spot mTargetCell = findNearestVacantArea(touchXY[0], touchXY[1], 1, 1, null, cellLayout, mTargetCell); } else { cellLayout.findCellForSpan(mTargetCell, 1, 1); } addInScreen(view, container, screen, mTargetCell[0], mTargetCell[1], info.spanX, info.spanY, insertAtFirst); cellLayout.onDropChild(view); CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams(); cellLayout.getChildrenLayout().measureChild(view); LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screen, lp.cellX, lp.cellY); if (d.dragView != null) { // We wrap the animation call in the temporary set and reset of the current // cellLayout to its final transform -- this means we animate the drag view to // the correct final location. setFinalTransitionTransform(cellLayout); mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view, exitSpringLoadedRunnable); resetTransitionTransform(cellLayout); } } }
这里也分为两个部分一部分是PendingAddItemInfo,PendingAddItemInfo是Widget有关的,这里不再详解,而我们的应用图标又会走到
addInScreen(view, container, screen, mTargetCell[0], mTargetCell[1], info.spanX, info.spanY, insertAtFirst);
这里,addInScreen我们上面已经讲解过了,这里就不再赘述了。其它的内容不再讲解,有兴趣自己研究吧。至此我们的拖动过程就讲解完了。
这篇中我们讲解了Launcher图标的加载过程,点击图标进入应用的过程,拖动图标的过程,至于安装应用、卸载应用、更新应用、壁纸、widget等等其它Launcher内容,如果有需以后再讲解吧。
还是那句话,给大师们茶余饭后取乐,给后来者抛砖引玉,不要在背后骂我就谢天谢地了。