当用户在屏幕的任意位置右滑时，我必须完成 Activity。我试过 GestureDetector如果 Activity 中既不存在 ScrollView 也不存在 RescyclerView 并且另外还有具有 onClickListener 的 View ，那么这可以正常工作> 也不允许检测对它们的滑动。所以我尝试了一种不同的方法，通过编程将 View 覆盖到所有 View 顶部的布局中，然后尝试检测其上方的滑动事件。

private void swipeOverToExit(ViewGroup rootView) {

        OverlayLayout child = new OverlayLayout(this);

        ViewGroup.LayoutParams layoutParams =
                new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        child.setLayoutParams(layoutParams);

        rootView.addView(child);

}

叠加布局

public class OverlayLayout extends RelativeLayout {

    private float x1, x2;
    private final int MIN_DISTANCE = 150;

    public OverlayLayout(Context context) {
        super(context);
    }

    public OverlayLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public OverlayLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public OverlayLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }


    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        /*
         * This method JUST determines whether we want to intercept the motion.
         * If we return true, onTouchEvent will be called and we do the actual
         * logic there.
         */

        final int action = MotionEventCompat.getActionMasked(event);

        Logger.logD("Intercept===", action + "");


        // Always handle the case of the touch gesture being complete.
        if (action == MotionEvent.ACTION_DOWN) {
            return true; // Intercept touch event, let the parent handle swipe
        }

        Logger.logD("===", "Out side" + action + "");


        // In general, we don't want to intercept touch events. They should be
        // handled by the child view.
        return false;
    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                x1 = event.getX();
                break;
            case MotionEvent.ACTION_UP:

                x2 = event.getX();
                float deltaX = x2 - x1;

                if (Math.abs(deltaX) > MIN_DISTANCE) {

                    Logger.logD("Swipe Right===", MIN_DISTANCE + "");
                    return true;

                } else {

                    Logger.logD("Tap===", "Tap===");
                    return super.onTouchEvent(event);
                }
        }

        return true;

    }
}

逻辑是如果在 OverlayLayout 上执行滑动操作，则将触摸事件拦截到其他 View ，然后进一步结束 Activity。但是，现在我可以检测到 OverlayLayout 上的滑动事件，但是即使我在 return super.onTouchEvent(event); 的 else 条件下，其他 View 也无法响应 onTouchEvent 你可以在我的代码中找到。任何人请帮我完成它。我被固定在这里并且非常兴奋地学习这个技巧:)

最佳答案

您尝试做的基本上是 Android Wear 中的默认行为 并且它被认为是 Android Watches 中退出应用程序的标准做法。 在安卓穿戴DismissOverlayView为您完成所有繁重的工作。

智能手机有返回按钮，而 Wear 依靠长按或滑动关​​闭模式来退出屏幕。您应该在后按时关闭 Activity，在 Android 智能手机中混合佩戴模式会使用户感到困惑。至少显示一个警告对话框以避免意外退出。

解决方案

我看到这个问题被标记为 Android Activity 我建议你制作一个 Base Activity 来处理滑动手势和 finish() 本身从左到右滑动。

基本 Activity 类应如下所示:-

   public abstract class SwipeDismissBaseActivity extends AppCompatActivity {
    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    private GestureDetector gestureDetector;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        gestureDetector = new GestureDetector(new SwipeDetector());
    }

    private class SwipeDetector extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

            // Check movement along the Y-axis. If it exceeds SWIPE_MAX_OFF_PATH,
            // then dismiss the swipe.
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;

            // Swipe from left to right.
            // The swipe needs to exceed a certain distance (SWIPE_MIN_DISTANCE)
            // and a certain velocity (SWIPE_THRESHOLD_VELOCITY).
            if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                finish();
                return true;
            }

            return false;
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        // TouchEvent dispatcher.
        if (gestureDetector != null) {
            if (gestureDetector.onTouchEvent(ev))
                // If the gestureDetector handles the event, a swipe has been
                // executed and no more needs to be done.
                return true;
        }
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
}

Now you can make other activities extend this base Activity and they will Inheritance will automatically make them adopt swipe to dismiss behavior .

public class SomeActivity extends SwipeDismissBaseActivity {

这种方式的优点

• 纯 OOPS 方法
• 简洁的代码 - 无需在项目中使用的每种布局(相对、线性等)中编写滑动监听器
• 在 ScrollView 中完美运行

关于android - 向右滑动即可结束 Activity ？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38388210/