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android - 如何将屏幕宽度分成两部分以进行滑动手势

问题描述

我正在使用 Exoplayer 开发视频播放器应用程序，并为音量和亮度应用滑动手势。上、下、右、左的滑动手势运行良好。但是我想将宽度分成两部分分别用于音量和亮度功能，建议我为此添加额外的代码。这是我的 OnSwipeTouchListner.java 代码

public class OnSwipeTouchListener implements View.OnTouchListener {
private final GestureDetector gestureDetector;

public OnSwipeTouchListener(Context ctx) {
    gestureDetector = new GestureDetector(ctx, new GestureListener());
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    return gestureDetector.onTouchEvent(event);
}

private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
    private static final int SWIPE_THRESHOLD = 100;
    private static final int SWIPE_VELOCITY_THRESHOLD = 100;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    ///below first one is downEvent second is moveEvent
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        boolean result = false;
        try {
            float diffY = e2.getY() - e1.getY();
            float diffX = e2.getX() - e1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                    result = true;
                }
            } else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                if (diffY > 0) {
                    onSwipeBottom();
                } else {
                    onSwipeTop();
                }
                result = true;
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}

public void onSwipeRight() {
}

public void onSwipeLeft() {
}

public void onSwipeTop() {
}

public void onSwipeBottom() {
}}

下面的代码是 Main Activity 中的实现

playerView.setOnTouchListener(new OnSwipeTouchListener(this){
        public void onSwipeTop() {
            Toast.makeText(VideoPlayerActivity.this, "top", Toast.LENGTH_SHORT).show();
        }
        public void onSwipeRight() {
            Toast.makeText(VideoPlayerActivity.this, "right", Toast.LENGTH_SHORT).show();
        }
        public void onSwipeLeft() {
            Toast.makeText(VideoPlayerActivity.this, "left", Toast.LENGTH_SHORT).show();
        }
        public void onSwipeBottom() {
            Toast.makeText(VideoPlayerActivity.this, "bottom", Toast.LENGTH_SHORT).show();
        }
    });

标签： androidandroid-studioswipeexoplayerswipe-gesture

解决方案

要检查屏幕的哪个部分被触摸（左侧或右侧），首先尝试通过在 onDown 中计算屏幕的宽度和高度：

screen_width = getResources().getDisplayMetrics().widthPixels;
screen_height = getResources().getDisplayMetrics().heightPixels;

创建 2 个布尔值：

private boolean isLeft;
private boolean isRight;

@Override
        public boolean onDown(MotionEvent event) {
            Log.d("TAG","onDown: ");
            screen_width = getResources().getDisplayMetrics().widthPixels;
            screen_height = getResources().getDisplayMetrics().heightPixels;
            
            if (event.getX() < (screen_width / 2)) {
                // isLeft means the left side is touched
                isLeft = true;
                isRight = false;

            } else if (event.getX() > (screen_width / 2)) {
                // isRight means the right side is touched
                isLeft = false;
                isRight = true;
            }
            // don't return false here
            // or else none of the other gestures will work
            return true;
        }

然后根据需要使用布尔值：

if (isRight) {

} else if (isLeft) {

}

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