网络图片加载的5种方式

HttpURLConnection方式

public Bitmap getImageBitmap(String url) {
		URL imgUrl = null;
		Bitmap bitmap = null;
		try {
			imgUrl = new URL(url);
			HttpURLConnection conn = (HttpURLConnection) imgUrl
					.openConnection();
			conn.setDoInput(true);
			conn.connect();
			InputStream is = conn.getInputStream();
			bitmap = BitmapFactory.decodeStream(is);
			is.close();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return bitmap;
}

HttpClient方式

public Bitmap getImageBitmap(String url) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		HttpGet httpget = new HttpGet(url);
		try {
			HttpResponse resp = httpclient.execute(httpget);
			// 判断是否正确执行
			if (HttpStatus.SC_OK == resp.getStatusLine().getStatusCode()) {
				// 将返回内容转换为bitmap
				HttpEntity entity = resp.getEntity();
				InputStream in = entity.getContent();
				Bitmap mBitmap = BitmapFactory.decodeStream(in);
				// 向handler发送消息，执行显示图片操作
				return mBitmap;
			}
 
		} catch (Exception e) {
		} finally {
			httpclient.getConnectionManager().shutdown();
		}
 
		return null;
}

XUtils方式

private void initView() {
	// TODO Auto-generated method stub
	BitmapUtils bitmapUtils = new BitmapUtils(this);
	// 加载网络图片
	bitmapUtils.display(imageView,
			"http://www.pptbz.com/pptpic/UploadFiles_6909/201203/2012031220134655.jpg");
 
	// 加载本地图片(路径以/开头， 绝对路径)
	// bitmapUtils.display(imageView, "/sdcard/test.jpg");
 
	// 加载assets中的图片(路径以assets开头)
	// bitmapUtils.display(imageView, "assets/img/wallpaper.jpg");
 
}

OkHttp方式

private void setIamge()
    {
    	String url = "http://www.pptbz.com/pptpic/UploadFiles_6909/201203/2012031220134655.jpg";
    	OkHttpUtils.get().url(url).tag(this)
    			.build()
    			.connTimeOut(20000).readTimeOut(20000).writeTimeOut(20000)
    			.execute(new BitmapCallback() {
    			@Override
    			public void onError(Call call, Exception e, int id) {
    				}
 
    			@Override
    			public void onResponse(Bitmap bitmap, int id) {
    					imageView.setImageBitmap(bitmap);
    				}
    			});
}

Volley方式

 /***
	 * ImageRequest加载图片
	 */
 public void setImg1()
 {
		
		
	ImageRequest request = new ImageRequest(VolleySingleton.imageThumbUrls[0],
		 new Response.Listener() {
		 @Override
		 public void onResponse(Bitmap bitmap) {
		        imageview1.setImageBitmap(bitmap);
		       }
		 }, 0, 0, Config.RGB_565,
		 new Response.ErrorListener() {
		     public void onErrorResponse(VolleyError error) {
		        imageview1.setImageResource(R.mipmap.ic_launcher);
		      }
	});
      VolleySingleton.getVolleySingleton(this.getApplicationContext()).addToRequestQueue(request);
	}
	/***
	 * 使用 ImageLoader 加载图片
	 */
	
	public void setImg2()
	{
		com.android.volley.toolbox.ImageLoader mImageLoader;
		mImageLoader =   VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
		mImageLoader.get(VolleySingleton.imageThumbUrls[1], 
				//mImageView是ImageView实例
				//第2个参数：默认图片
				//第2个参数：加载图片错误时的图片
		com.android.volley.toolbox.ImageLoader.getImageListener(imageview2,R.mipmap.ic_launcher, R.mipmap.ic_launcher));
	}
	/**
	 * 使用NetworkImageView加载图片
	 */
	public void setImg3()
	{
		com.android.volley.toolbox.ImageLoader mImageLoader;
		mImageLoader = VolleySingleton.getVolleySingleton(this.getApplicationContext()).getImageLoader();
		networkImageView.setImageUrl(VolleySingleton.imageThumbUrls[2], mImageLoader);
}