packagecom.example.eventtest; importjava.util.ArrayList; importandroid.os.Bundle; importandroid.app.Activity; importandroid.gesture.GestureOverlayView; importandroid.gesture.GestureOverlayView.OnGestureListener; importandroid.graphics.Point; importandroid.view.Menu; importandroid.view.MotionEvent; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Toast; publicclassMainActivityextendsActivity{ doublenLenStart=0; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override publicbooleanonTouchEvent(MotionEventevent){ intnCnt=event.getPointerCount(); intn=event.getAction(); if((event.getAction()&MotionEvent.ACTION_MASK)==MotionEvent.ACTION_POINTER_DOWN&&2==nCnt)//<spanstyle="color:#ff0000;">2表示两个手指</span> { for(inti=0;i<nCnt;i++) { floatx=event.getX(i); floaty=event.getY(i); Pointpt=newPoint((int)x,(int)y); } intxlen=Math.abs((int)event.getX(0)-(int)event.getX(1)); intylen=Math.abs((int)event.getY(0)-(int)event.getY(1)); nLenStart=Math.sqrt((double)xlen*xlen+(double)ylen*ylen); }elseif((event.getAction()&MotionEvent.ACTION_MASK)==MotionEvent.ACTION_POINTER_UP&&2==nCnt) { for(inti=0;i<nCnt;i++) { floatx=event.getX(i); floaty=event.getY(i); Pointpt=newPoint((int)x,(int)y); } intxlen=Math.abs((int)event.getX(0)-(int)event.getX(1)); intylen=Math.abs((int)event.getY(0)-(int)event.getY(1)); doublenLenEnd=Math.sqrt((double)xlen*xlen+(double)ylen*ylen); if(nLenEnd>nLenStart)//通过两个手指开始距离和结束距离，来判断放大缩小 { Toast.makeText(getApplicationContext(),"放大",3000).show(); } else { Toast.makeText(getApplicationContext(),"缩小",3000).show(); } } getAction()方法返回的是int类型，用到的只有低16位，其中：低八位是动作的类型，高8位是触摸点索引值的表示（单点为0，双点为1） 获得动作类型：intaction=event.getAction()&ACTION_MASK 或者使用getActionMasked() 获得触摸点索引类型：intpointerIndex=(event.getAction()&ACTION_POINTER_INDEX_MASK)>>ACTION_POINTER_INDEX_SHIFT 或者使用getActionIndex() returnsuper.onTouchEvent(event); } } |
