倒计时 3..2..1 跳转 hander消息机制

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布局:<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/logo"    tools:context="com.example.administrator.jinritoutiao.MainActivity"><TextView    android:id="@+id/tv"    android:layout_width="50dp"    android:layout_height="150dp"    android:textSize="40dp"    android:text="3"    android:textColor="#f00"    android:layout_alignParentRight="true"    />
//代码


public class MainActivity extends AppCompatActivity {   
 private Timer timer;  
  private int i = 3; 
   private Handler handler = new Handler(){  
      @Override   
     public void handleMessage(Message msg) { 
           if(msg.what == 0){       
         //计时停止            
          timer.cancel();    
         Intent intent = new Intent(MainActivity.this,Main2Activity.class);  
              startActivity(intent);  
          }else{     
           textView.setText(""+i--);   
         }        }    };  
  private TextView textView; 
   @Override  
  protected void onCreate(Bundle savedInstanceState) {   
     super.onCreate(savedInstanceState);      
         timer = new Timer();     
   textView = (TextView) findViewById(R.id.tv);  
      timer.schedule(new TimerTask() {   
         @Override           
 public void run() {     
           if(i == 0){     
               handler.sendEmptyMessage(0);  
              }else{           
         handler.sendEmptyMessage(1);   
             }            }        },0,1000);    }}
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