Android： 一个两点触控的案例

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);
    }
}