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);
  }
}