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;
  }  

}