android识别 单击和双击事件

package com.test.test;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.GestureDetector.OnGestureListener;
import android.widget.LinearLayout;
import android.widget.TextView;
public class AndroidTestActivity extends Activity implements OnGestureListener {      
  private LinearLayout main;      
  private TextView viewA;
  private GestureDetector gestureScanner;
  @Override 
  public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    gestureScanner = new GestureDetector(this);  
    gestureScanner.setOnDoubleTapListener(new GestureDetector.OnDoubleTapListener(){ 
      public boolean onDoubleTap(MotionEvent e) { 
        viewA.setText("-" + "onDoubleTap" + "-"); 
        //双击时产生一次
        Log.v("test", "onDoubleTap");
        return false; 
      }
      public boolean onDoubleTapEvent(MotionEvent e) { 
        //双击时产生两次
        Log.v("test", "onDoubleTapEvent");
        return false;
      } 
      public boolean onSingleTapConfirmed(MotionEvent e) { 
        viewA.setText("-" + "onSingleTapConfirmed" + "-"); 
        //短快的点击算一次单击
        Log.v("test", "onSingleTapConfirmed");
        return false; 
      } 
    });

    main = new LinearLayout(this);  
    main.setBackgroundColor(Color.GRAY);
    main.setLayoutParams(new LinearLayout.LayoutParams(320,480));
    main.setOrientation(LinearLayout.VERTICAL);
    viewA = new TextView(this);
    viewA.setBackgroundColor(Color.YELLOW);
    viewA.setTextColor(Color.BLACK);  
    viewA.setTextSize(16);
    viewA.setLayoutParams(new LinearLayout.LayoutParams(320,50));  
    main.addView(viewA);
    setContentView(main);  
  }
  public boolean onTouchEvent(MotionEvent me) {  
    return gestureScanner.onTouchEvent(me);  
  }  
  public boolean onDown(MotionEvent e) {  
    //viewA.setText("-" + "DOWN" + "-");  
    return true;  
  }  
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {  
    //viewA.setText("-" + "FLING" + "- "+velocityX + "- "+velocityY);  
    Log.v("test", "onFling "+e1.getX()+" "+e2.getX());
    return true;  
  }  
 
  public void onLongPress(MotionEvent e) {  
    //viewA.setText("-" + "LONG PRESS" + "-");  
  }  
  public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {  
    //viewA.setText("-" + "SCROLL" + "- "+distanceX + "- "+distanceY);  
    Log.v("test", "onScroll "+e1.getX()+" "+e2.getX());
    return true;  
  }  
  public void onShowPress(MotionEvent e) {  
    //viewA.setText("-" + "SHOW PRESS" + "-");  
  }
  public boolean onSingleTapUp(MotionEvent e) {  
    Log.v("test", "onSingleTapUp");
    //viewA.setText("-" + "SINGLE TAP UP" + "-"+ i++);  
    return true;  
  }  
 
}