Android编程实现两点触控功能示例

package com.zzj;import android.app.Activity;import android.os.Bundle;import android.view.MotionEvent;public class AndroidTestActivity extends Activity {  private float x0, y0;  private float x1, y1;  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);  }  public boolean onTouchEvent(MotionEvent event) {    int pointerCount = event.getPointerCount();    int action = event.getAction();    if (pointerCount == 1) {      switch (action) {      case MotionEvent.ACTION_DOWN:        x0 = event.getX(0);        y0 = event.getY(0);        System.out.println("ACTION_DOWN pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_UP:        System.out.println("ACTION_UP pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_MOVE:        System.out.println("ACTION_MOVE pointerCount=" + pointerCount);        break;      }    }    if (pointerCount == 2) {      switch (action) {      case MotionEvent.ACTION_DOWN:        x0 = event.getX(0);        y0 = event.getY(0);        System.out.println("ACTION_DOWN pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_UP:        System.out.println("ACTION_UP pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_MOVE:        System.out.println("ACTION_MOVE pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_POINTER_1_DOWN:        System.out.println("ACTION_POINTER_1_DOWN pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_POINTER_1_UP:        System.out.println("ACTION_POINTER_1_UP pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_POINTER_2_DOWN:        System.out.println("ACTION_POINTER_2_DOWN pointerCount=" + pointerCount);        break;      case MotionEvent.ACTION_POINTER_2_UP:        System.out.println("ACTION_POINTER_2_UP pointerCount=" + pointerCount);        break;      }    }    return super.onTouchEvent(event);  }}