Android Handler练习

 package com.example.myact12;

 import java.util.Random;

 import android.support.v7.app.ActionBarActivity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 /**
  * Android handler
  * @Describe:
  * @package: com.example.myact12
  * @author shaobn
  * @date 2015-9-16 上午10:11:50
  */
 public class MainActivity extends ActionBarActivity {
     private Button start;
     private Button end;
     private TextView textView;
     private Handler handler = new Handler();

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         start = (Button) this.findViewById(R.id.button1);
         end = (Button) this.findViewById(R.id.button2);
         textView = (TextView) this.findViewById(R.id.textView1);
         start.setOnClickListener(new ButtonClick());
         end.setOnClickListener(new ButtonClick());
     }
     class ButtonClick implements View.OnClickListener{
         @Override
         public void onClick(View arg0) {
             // TODO Auto-generated method stub
                 switch (arg0.getId()) {
                 case R.id.button1:
                     Runnable runnable = new Runnable() {

                         @Override
                         public void run() {
                             // TODO Auto-generated method stub
                             Random random = new Random();
                             final int num = random.nextInt(100);
                             Runnable runnable2 = new Runnable() {

                                 @Override
                                 public void run() {
                                     // TODO Auto-generated method stub
                                     try {
                                         Thread.sleep(1000);
                                     } catch (Exception e) {
                                         // TODO: handle exception
                                         e.printStackTrace();
                                     }

                                     MainActivity.this.textView.setText(String.valueOf(num));
                                 }
                             };

                             MainActivity.this.handler.post(runnable2);
                         }
                     };
                     new Thread(runnable).start();
                     break;

                 case R.id.button2:
                     Runnable runnable2 = new Runnable() {

                         @Override
                         public void run() {
                             // TODO Auto-generated method stub

                         }
                     };
                     break;
                 }

         }

     }
 }