android - 在 ScrollView 中实现向左/向右滑动

Question

我想向 ScrollView 添加滑动功能(从右到左和从左到右)，但不拦截所有触摸事件，这样子按钮仍然可以点击。

我像这样向 ScrollView 添加了触摸监听器:

this.getView().findViewById(R.id.scrollView1).setOnTouchListener(new OnSwipeTouchListener() {
            public void onSwipeTop() {
                Toast.makeText(DetailFragment.this.getActivity(), "top", Toast.LENGTH_SHORT).show();
            }

            public void onSwipeRight() {
                Toast.makeText(DetailFragment.this.getActivity(), "right", Toast.LENGTH_SHORT).show();
            }

            public void onSwipeLeft() {
                Toast.makeText(DetailFragment.this.getActivity(), "left", Toast.LENGTH_SHORT).show();
            }

            public void onSwipeBottom() {
                Toast.makeText(DetailFragment.this.getActivity(), "bottom", Toast.LENGTH_SHORT).show();
            }
        });

如果我让它保持原样，那么我的触摸监听器将永远不会被调用。所以我必须子类化 ScrollView 并覆盖 onInterceptTouchEvent，这样 ScrollView 将决定它要拦截哪些触摸事件:

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    boolean intercept = false;
    final int action = ev.getAction();
    ViewConfiguration vc = ViewConfiguration.get(this.getContext());
    int slop = vc.getScaledTouchSlop();
    switch (action & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_UP: {
            float currX = ev.getX();
            if (Math.abs(currX - originalX) > slop) {
                intercept = true;
            }
            break;
        }
        case MotionEvent.ACTION_DOWN: {
            originalX = ev.getX();
            break;
        }
    }

    return (super.onInterceptTouchEvent(ev) || intercept);
}

所以我的想法是只拦截向左/向右滑动，所有其他事件应该留给 subview 。 ScrollView 中的按钮似乎可以工作，但我的监听器无论如何都不会被调用。

我在 xml 中的 View 如下所示:

<com.damluar.mobile.inbox.MyScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:visibility="visible"
            android:id="@+id/detailLayout">
        <LinearLayout
                android:id="@+id/detailButtonLayout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:orientation="horizontal"
                android:background="@color/default_color">
        </LinearLayout>

    </LinearLayout>
</com.damluar.mobile.inbox.MyScrollView>

Answer 1

请检查并标记它是否有用。我已经稍微更新了 OnSwipeTouchListener 以获得 onTouch 的回调。

public class OnSwipeTouchListener implements OnTouchListener {
private final GestureDetector gestureDetector = new GestureDetector(
        new GestureListener());

@Override
public boolean onTouch(final View view, final MotionEvent motionEvent) {
    return gestureDetector.onTouchEvent(motionEvent);

}

private final class GestureListener extends SimpleOnGestureListener {

    private static final int SWIPE_THRESHOLD = 50;
    private static final int SWIPE_VELOCITY_THRESHOLD = 50;
    private static final int SWIPE_DISTANCE = 50;


    private boolean isFlingCall = false;

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



    @Override
    public boolean onSingleTapUp(MotionEvent e){    
        if(!isFlingCall) {
            onTouch();
            return false;
        }
        else {
            return true;
        }

    }
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        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 > SWIPE_DISTANCE) {
                        isFlingCall = true;
                        onSwipeRight();
                        return true;
                    }
                    else {
                        onSwipeLeft();
                        return true;
                    }
                }
            }

        } catch (Exception exception) {
            exception.printStackTrace();
        }
        onTouch();
        return true;
    }
}

public void onSwipeRight() {
}

public void onSwipeLeft() {
}
public void onTouch() {
}
}

谢谢

JH