网络加载图片

    <uses-permission android:name="android.permission.INTERNET"/>

1

public class MainActivity extends ActionBarActivity {
	
	ImageView show;
	
	Bitmap bitmap;
	Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			if(msg.what == 0x123){
				show.setImageBitmap(bitmap);
			}
		};
	};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        show = (ImageView) findViewById(R.id.imageView1);
        new Thread(){
        	@Override
        	public void run() {
        		try {
					URL url = new URL("http://ygimg1.mnsfz.com/pic/yangguang/2013-4-17/1/6.jpg");
					InputStream is = url.openStream();
					bitmap = BitmapFactory.decodeStream(is);
					handler.sendEmptyMessage(0x123);
					is.close();
					is = url.openStream();
					OutputStream os = openFileOutput("crazyit.jpg", MODE_WORLD_READABLE);
					byte[] buff = new byte[1024];
					int hasRead = 0 ;
					while((hasRead = is.read(buff)) > 0){
						os.write(buff, 0, hasRead); 
					}
					is.close();
					os.close();
        		} catch (Exception e) {
        			e.printStackTrace();
        		}
        		super.run();
        	}
        }.start();
        
    }
}