package activity.cyq.handlermessage;

 import android.content.res.Resources;

 import android.graphics.Bitmap;

 import android.graphics.BitmapFactory;

 import android.os.Handler;

 import android.os.Message;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.widget.Button;

 import android.widget.ImageView;

 import android.widget.TextView;

 import android.widget.Toast;

 public class MainActivity extends AppCompatActivity {

     private TextView textView;

     private Button button;

     private ImageView imageView;

     private int[] iamgeId = new int[]{R.drawable.aaa1, R.drawable.aaa3, R.drawable.image1};

     private Handler handler = new Handler(new Handler.Callback() {

         @Override

         public boolean handleMessage(Message msg) {

             Toast.makeText(MainActivity.this, "这是Handler的回掉函数", Toast.LENGTH_SHORT).show();

             /*如果返回true则终止handler()的执行 ，可用于对message内容进行判断，今儿决定是否继续对messsage的处理*/

             return false;

         }

     }) {

         @Override

         public void handleMessage(Message msg) {

             super.handleMessage(msg);

             textView.setText(msg.arg1 + "" + msg.arg2);

             imageView.setImageBitmap((Bitmap) msg.obj);

         }

     };

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         textView = (TextView) findViewById(R.id.textView);

         button = (Button) findViewById(R.id.button);

         imageView = (ImageView) findViewById(R.id.imageView);

         /*通过handler.post(Runnable)方法根性UI*/

         new Thread() {

             @Override

             public void run() {

                 super.run();

                 /*创建一个Bitmap对象*/

                 Resources res = getResources();

                 Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.aaa1);

                 /*发送Message*/

                 Message message = new Message();

                 message.arg1 = 123;

                 message.arg2 = 245;

                 message.obj = bmp;

                 /* arg1 arg2 是int类型数据 obj为object类型数据 */

                 handler.sendMessage(message);

             }

         }.start();

     }

 }