Android三种基本的加载网络图片方式，包括普通加载网络方式、用ImageLoader加载图片、用Volley加载图片。
1. [代码]普通加载网络方式
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public class NormalLoadPictrue {
private String uri;
private ImageView imageView;
private byte[] picByte;
public void getPicture(String uri,ImageView imageView){
this.uri = uri;
this.imageView = imageView;
new Thread(runnable).start();
}
@SuppressLint("HandlerLeak")
Handler handle = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1) {
if (picByte != null) {
Bitmap bitmap = BitmapFactory.decodeByteArray(picByte, 0, picByte.length);
imageView.setImageBitmap(bitmap);
}
}
}
};
Runnable runnable = new Runnable() {
@Override
public void run() {
try {
URL url = new URL(uri);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(10000);
if (conn.getResponseCode() == 200) {
InputStream fis = conn.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int length = -1;
while ((length = fis.read(bytes)) != -1) {
bos.write(bytes, 0, length);
}
picByte = bos.toByteArray();
bos.close();
fis.close();
Message message = new Message();
message.what = 1;
handle.sendMessage(message);
}
}catch (IOException e) {
e.printStackTrace();
}
}
};
} |
2. [代码]用ImageLoader加载图片
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public class ImageLoaderPicture {
private DisplayImageOptions options;
public ImageLoaderPicture(Context context) {
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).threadPriority(Thread.NORM_PRIORITY - 2)
.denyCacheImageMultipleSizesInMemory()
.discCacheFileNameGenerator(new Md5FileNameGenerator())
.tasksProcessingOrder(QueueProcessingType.LIFO).enableLogging()
.memoryCache(new WeakMemoryCache())
.build();
ImageLoader.getInstance().init(config);
options = new DisplayImageOptions.Builder()
.showStubImage(0)
.showImageForEmptyUri(0)
.showImageOnFail(0)
.cacheInMemory().cacheOnDisc()
.imageScaleType(ImageScaleType.IN_SAMPLE_INT)
.bitmapConfig(android.graphics.Bitmap.Config.RGB_565)
.build();
}
public DisplayImageOptions getOptions() {
return options;
}
public void setOptions(DisplayImageOptions options) {
this.options = options;
}
} |
3. [代码]用Volley加载图片
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public class VolleyLoadPicture {
private ImageLoader mImageLoader = null;
private BitmapCache mBitmapCache;
private ImageListener one_listener;
public VolleyLoadPicture(Context context,ImageView imageView){
one_listener = ImageLoader.getImageListener(imageView, 0, 0);
RequestQueue mRequestQueue = Volley.newRequestQueue(context);
mBitmapCache = new BitmapCache();
mImageLoader = new ImageLoader(mRequestQueue, mBitmapCache);
}
public ImageLoader getmImageLoader() {
return mImageLoader;
}
public void setmImageLoader(ImageLoader mImageLoader) {
this.mImageLoader = mImageLoader;
}
public ImageListener getOne_listener() {
return one_listener;
}
public void setOne_listener(ImageListener one_listener) {
this.one_listener = one_listener;
}
class BitmapCache implements ImageCache {
private LruCache<String, Bitmap> mCache;
private int sizeValue;
public BitmapCache() {
int maxSize = 10 * 1024 * 1024;
mCache = new LruCache<String, Bitmap>(maxSize) {
@Override
protected int sizeOf(String key, Bitmap value) {
sizeValue = value.getRowBytes() * value.getHeight();
return sizeValue;
}
};
}
@Override
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
mCache.put(url, bitmap);
}
}
} |
4. [代码]Activity
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public class MainActivity extends Activity {
private ImageView imageView001,imageView002,imageView003;
public static final String picUrl = "http://img.quwenjiemi.com/2014/0701/thumb_420_234_20140701112917406.jpg";
//public static final String picUrl = "http://192.168.1.181:8081/AndroidSerivces/house.jpg";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView001 = (ImageView)findViewById(R.id.imageView001);
imageView002 = (ImageView)findViewById(R.id.imageView002);
imageView003 = (ImageView)findViewById(R.id.imageView003);
//用普通方法加载图片
new NormalLoadPictrue().getPicture(picUrl,imageView001);
//用ImageLoader加载图片
ImageLoader.getInstance().displayImage(picUrl, imageView002,new ImageLoaderPicture(this).getOptions(),new SimpleImageLoadingListener());
//用Volley加载图片
VolleyLoadPicture vlp = new VolleyLoadPicture(this, imageView003);
vlp.getmImageLoader().get(picUrl, vlp.getOne_listener());
}
} |
5. [代码]布局文件
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<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp">
<TextView
android:id="@+id/textView001"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1.用普通方法的加载图片"/>
<ImageView
android:id="@+id/imageView001"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView001"/>
<TextView
android:id="@+id/textView002"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView001"
android:text="2.用Android-Universal-Image-Loader加载图片"/>
<ImageView
android:id="@+id/imageView002"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView002"/>
<TextView
android:id="@+id/textView003"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView002"
android:text="3.用Volley加载图片"/>
<ImageView
android:id="@+id/imageView003"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView003"/>
</RelativeLayout>
</ScrollView> |
6. [文件] 三种基本网络加载图片方式.rar ~ 2MB 下载
转自：http://www.oschina.net/code/snippet_1470644_36944