Handler

不想多说

   private Button btn;
 private ImageView image;
 private ProgressDialog dialog;
 private static int FINSH=1;
 private Handler handler=new Handler(){
  public void handleMessage(android.os.Message msg) {
   if(msg.what==FINSH){
    dialog.dismiss();
   }
   byte[] data=(byte[])msg.obj;
   Bitmap bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);
   image.setImageBitmap(bitmap);
  };
 };
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  dialog=new ProgressDialog(this);
  dialog.setMessage("load.....");
  btn=(Button) findViewById(R.id.button1);
  image=(ImageView) findViewById(R.id.imageView1);
  btn.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    new Thread(new Down()).start();
    dialog.show();
   }
  });
 }
 
 public class Down implements Runnable{
  private String path="http://www.baidu.com/img/315-270_e9a7cf5b20f0b58d37dcbe8b9b170713.gif";
  @Override
  public void run() {
   // TODO Auto-generated method stub
   HttpClient client=new DefaultHttpClient();
   HttpPost post=new HttpPost(path);
   try {
    HttpResponse response=client.execute(post);
    if(response.getStatusLine().getStatusCode()==200){
     byte[] bs=EntityUtils.toByteArray(response.getEntity());
     Message message=Message.obtain();
     message.obj=bs;
     message.what=FINSH;
     handler.sendMessage(message);
    }
   } catch (Exception e) {
    // TODO: handle exception
   }finally{
    client.getConnectionManager().shutdown();
   }
   
  }
  }

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Handler

原文：http://www.cnblogs.com/lk119/p/3602286.html