android view 上下左右滑动事件

最新推荐文章于 2024-04-28 18:47:53 发布

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本文详细探讨了如何在Android应用中实现View的上下左右滑动事件监听。通过自定义View并覆盖onTouchEvent()方法，结合MotionEvent ACTION_DOWN、ACTION_MOVE和ACTION_UP等事件，可以捕捉和处理滑动操作。同时，文章还讨论了如何进行滑动方向判断和防止误触的优化策略。

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import android.app.Activity;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public abstract class MoveListerner implements OnTouchListener,
		OnGestureListener {
	public static final int MOVE_TO_LEFT = 0;
	public static final int MOVE_TO_RIGHT = MOVE_TO_LEFT + 1;
	public static final int MOVE_TO_UP = MOVE_TO_RIGHT + 1;
	public static final int MOVE_TO_DOWN = MOVE_TO_UP + 1;

	private static final int FLING_MIN_DISTANCE = 150;
	private static final int FLING_MIN_VELOCITY = 50;
	private boolean isScorllStart = false;
	private boolean isUpAndDown = false;
	GestureDetector mGestureDetector;
	float x1 = 0;
	float x2 = 0;
	float y1 = 0;
	float y2 = 0;

	public MoveListerner(Activity context) {
		super();
		mGestureDetector = new GestureDetector(context, this);
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		if (mGestureDetector.onTouchEvent(event))
			return true;
		// 处理手势结束
		switch (event.getAction() & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_UP:
			endGesture();
			break;
		}
		return false;
	}

	private void endGesture() {
		isScorllStart = false;
		isUpAndDown = false;
		Log.e("a", "AA:over");
		moveOver();
	}

	public abstract void moveDirection(View v, int direction);

	public abstract void moveUpAndDownDistance(MotionEvent event,int distance,int distanceY);

	public abstract void moveOver();

	@Override
	public boolean onDown(MotionEvent e) {
		// TODO Auto-generated method stub
		return true;
	}

	@Override
	public void onShowPress(MotionEvent e) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onSingleTapUp(MotionEvent e) {
		// TODO Auto-generated method stub
		return true;
	}

	@Override
	public void onLongPress(MotionEvent e) {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		Log.e("a", "AA:B" + distanceX + ":" + distanceY);
		float mOldY = e1.getY();
		int y = (int) e2.getRawY();
		if (!isScorllStart) {
			if (Math.abs(distanceX) / Math.abs(distanceY) > 2) {
				// 左右滑动
				isUpAndDown = false;
				isScorllStart = true;
			} else if (Math.abs(distanceY) / Math.abs(distanceX) > 3) {
				// 上下滑动
				isUpAndDown = true;
				isScorllStart = true;
			} else {
				isScorllStart = false;
			}
		} else {
			// 算滑动速度的问题了
			if (isUpAndDown) {
				// 是上下滑动，关闭左右检测
				if (mOldY + 5 < y) {
					moveUpAndDownDistance(e2,-3,(int)distanceY);
				} else if (mOldY + 5 > y) {
					moveUpAndDownDistance(e2,3,(int)distanceY);
				}
			}
		}
		return true;
	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		Log.e("a", "AA:A" + velocityX + ":" + velocityY);
		if (isUpAndDown)
			return false;
		if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE
				&& Math.abs(velocityX) > FLING_MIN_VELOCITY) {
			// Fling left
			moveDirection(null, MOVE_TO_LEFT);
		} else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE
				&& Math.abs(velocityX) > FLING_MIN_VELOCITY) {
			// Fling right
			moveDirection(null, MOVE_TO_RIGHT);
		}
		// else if (e1.getY() - e2.getY() > FLING_MIN_DISTANCE
		// && Math.abs(velocityY) > FLING_MIN_VELOCITY) {
		// // Fling up
		// moveDirection(null, MOVE_TO_UP);
		// } else {
		// // Fling down
		// moveDirection(null, MOVE_TO_DOWN);
		// }
		return false;
	}
}