Android手势实现切换界面的效果

最新推荐文章于 2019-06-11 21:03:19 发布

原创最新推荐文章于 2019-06-11 21:03:19 发布 · 2.1k 阅读

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#android #animation #velocity #distance #exception #float

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本文介绍了一种在Android应用中实现手势识别和滑动监听的方法。通过定义GestureDetector对象并实现OnGestureListener接口，可以捕捉用户的触摸及滑动手势，并根据不同的滑动方向触发相应的UI动画效果。

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定义手势对象detector=new GestureDetector(new GestureListener());

	listView.setOnTouchListener(new TouhListener());//设置监听手势

  //触摸屏幕监听
	class TouhListener implements OnTouchListener{


		@Override
		public boolean onTouch(View v, MotionEvent event) {
			// TODO Auto-generated method stub
//			Toast.makeText(getApplicationContext(), "----?", event.getAction()).show();
			return detector.onTouchEvent(event);
		}
		
	}

//手势滑动监听
	class GestureListener implements OnGestureListener{

		@Override
		public boolean onDown(MotionEvent e) {
			// TODO Auto-generated method stub
		/*
		 * 当触摸屏幕是使用这个函数
		 */
//			Toast.makeText(getApplicationContext(), "-----------> onDown", Toast.LENGTH_LONG).show();
			return false;
		}

		@Override
		public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
				float velocityY) {
			
			try { 
				if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) 
				return false; 
				// right to left swipe 
				if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE 
				&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
				Log.i("test ", "right"); 
				Animation reverse = AnimationUtils
						.loadAnimation(AgendaGridViewActivity.this, R.anim.push_left);
				if(index == 3){
					setSelect(index = 0,reverse);
				}else{
					setSelect(index =index+1,reverse);
				}
				gridMenus.setNextFocusRightId(View.FOCUS_DOWN);
				} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE 
				&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
				Log.i("test ", "left"); 
				Animation reverse = AnimationUtils
						.loadAnimation(AgendaGridViewActivity.this, R.anim.push_right);

				if(index == 0){
					setSelect(index = 3,reverse);
				}else{
					setSelect(index = index-1,reverse);
				}
				} 
				} catch (Exception e) { 
				// nothing 
				} 
				return false; 
		}