--摘自《android插件化开发指南》
1.静态广播和动态广播仅区别于注册方式的不同。静态广播的注册信息保存在PMS中，动态广播的注册信息保存在AMS中
2.发送广播，也就是Context的sendBroadcast方法，最终会调用AMN.getDefault().broadcastIntent，把要发送的广播告诉AMS;
AMS在收到上述信息后，搜索AMS和PMS中保存的广播，看哪些广播符合条件，然后通知App进程启动这些广播，也就是调用这些广播的onReceive方法
3.无论发送广播还是接受广播，都携带一个筛选条件：intent-filter。
<receiver
android:name=".MyReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="baobao2"/>
</receiver>
MyReceiver myReceiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("baobao2");
registerReceiver(myReceiver,intentFilter);
***动态广播的插件化解决方案***
使用前面介绍的dex合并技术，插件中的动态广播就可以被宿主App正常调用了
***静态广播的插件化解决方案***
1)PMS只能读取宿主App的AndroidManifest文件，读取其中的静态广播并注册。我们可以通过反射，手动控制PMS读取插件的AndroidManifest中声明的静态广播列表
2)遍历这个静态广播列表。使用插件的classLoader加载列表中的每个广播类，实例化成一个对象，然后作为动态广播注册到AMS中
public final class ReceiverHelper {
private static final String TAG = "ReceiverHelper";
/**
* 解析插件Apk文件中的 <receiver>, 并存储起来
*
* @param apkFile
* @throws Exception
*/
public static void preLoadReceiver(Context context, File apkFile) {
// 首先调用parsePackage获取到apk对象对应的Package对象
Object packageParser = RefInvoke.createObject("android.content.pm.PackageParser");
Class[] p1 = {File.class, int.class};
Object[] v1 = {apkFile, PackageManager.GET_RECEIVERS};
Object packageObj = RefInvoke.invokeInstanceMethod(packageParser, "parsePackage", p1, v1);
// 读取Package对象里面的receivers字段,注意这是一个 List<Activity> (没错,底层把<receiver>当作<activity>处理)
// 接下来要做的就是根据这个List<Activity> 获取到Receiver对应的 ActivityInfo (依然是把receiver信息用activity处理了)
List receivers = (List) RefInvoke.getFieldObject(packageObj, "receivers");
for (Object receiver : receivers) {
registerDynamicReceiver(context, receiver);
}
}
// 解析出 receiver以及对应的 intentFilter
// 手动注册Receiver
public static void registerDynamicReceiver(Context context, Object receiver) {
//取出receiver的intents字段
List<? extends IntentFilter> filters = (List<? extends IntentFilter>) RefInvoke.getFieldObject(
"android.content.pm.PackageParser$Component", receiver, "intents");
try {
// 把解析出来的每一个静态Receiver都注册为动态的
for (IntentFilter intentFilter : filters) {
ActivityInfo receiverInfo = (ActivityInfo) RefInvoke.getFieldObject(receiver, "info");
BroadcastReceiver broadcastReceiver = (BroadcastReceiver) RefInvoke.createObject(receiverInfo.name);
context.registerReceiver(broadcastReceiver, intentFilter);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
***不启动App和插件中的静态广播通信***
在宿主的androidmanifest中注册占位StubReceiver
<application
android:name="jianqiang.com.receiverhook.UPFApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity> <receiver
android:name=".StubReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="jianqiang1" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang2" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang3" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang4" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang5" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang6" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang7" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang8" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang9" />
</intent-filter>
<intent-filter>
<action android:name="jianqiang10" />
</intent-filter>
</receiver>
</application>
插件的androidmanifest中注册
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme"> <receiver
android:name=".MyReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="baobao" />
</intent-filter>
<meta-data android:name="oldAction" android:value="jianqiang1"></meta-data>
</receiver>
<receiver
android:name=".MyReceiver2"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="baobao2" />
</intent-filter>
<meta-data android:name="oldAction" android:value="jianqiang2"></meta-data>
</receiver>
</application>
具体流程是宿主清单文件中查找jianqiang1，然后到插件的清单文件中查找jianqiang1，最后找到jianqiang1对应的baobao，这才是真正要注册的广播
实现逻辑如下
public final class ReceiverHelper {
private static final String TAG = "ReceiverHelper";
/**
* 解析插件Apk文件中的 <receiver>, 并存储起来
*
* @param apkFile
* @throws Exception
*/
public static void preLoadReceiver(Context context, File apkFile) {
// 首先调用parsePackage获取到apk对象对应的Package对象
Object packageParser = RefInvoke.createObject("android.content.pm.PackageParser");
Class[] p1 = {File.class, int.class};
Object[] v1 = {apkFile, PackageManager.GET_RECEIVERS};
Object packageObj = RefInvoke.invokeInstanceMethod(packageParser, "parsePackage", p1, v1);
String packageName = (String)RefInvoke.getFieldObject(packageObj, "packageName");
// 读取Package对象里面的receivers字段,注意这是一个 List<Activity> (没错,底层把<receiver>当作<activity>处理)
// 接下来要做的就是根据这个List<Activity> 获取到Receiver对应的 ActivityInfo (依然是把receiver信息用activity处理了)
List receivers = (List) RefInvoke.getFieldObject(packageObj, "receivers");
try {
for (Object receiver : receivers) {
Bundle metadata = (Bundle)RefInvoke.getFieldObject(
"android.content.pm.PackageParser$Component", receiver, "metaData");
String oldAction = metadata.getString("oldAction");
// 解析出 receiver以及对应的 intentFilter
List<? extends IntentFilter> filters = (List<? extends IntentFilter>) RefInvoke.getFieldObject(
"android.content.pm.PackageParser$Component", receiver, "intents");
// 把解析出来的每一个静态Receiver都注册为动态的
for (IntentFilter intentFilter : filters) {
ActivityInfo receiverInfo = (ActivityInfo) RefInvoke.getFieldObject(receiver, "info");
BroadcastReceiver broadcastReceiver = (BroadcastReceiver) RefInvoke.createObject(receiverInfo.name);
context.registerReceiver(broadcastReceiver, intentFilter);
String newAction = intentFilter.getAction(0);
ReceiverManager.pluginReceiverMappings.put(oldAction, newAction);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public class StubReceiver extends BroadcastReceiver {
public StubReceiver() {
}
@Override
public void onReceive(Context context, Intent intent) {
String newAction = intent.getAction();
if(ReceiverManager.pluginReceiverMappings.containsKey(newAction)) {
String oldAction = ReceiverManager.pluginReceiverMappings.get(newAction);
context.sendBroadcast(new Intent(oldAction));
}
}
}
缺点是要为StubReceiver配置几百个Action，无法避免
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