Android三种基本的加载网络图片方式(转)

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

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

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

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

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

<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"