使用GestureLibrary和ScrollView

Question

正如我在标题上提到的,app也有一个ScrollView和一个GestureDetector.在ScrollView的触摸事件之外,GestureDetector处理从左到右和从右到左的滑动操作.他们都运作良好.

现在我想添加一个GestureLibrary-I表示raw-到Activity.我看了不同的来源,并以某种方式添加得当.简单地说,布局看起来像这样:

<android.gesture.GestureOverlayView
    android:id="@+id/gOverlay"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ScrollView 
        android:id="@+id/content_scroll"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scrollbars="none">

            </ScrollView>
            <!-- Other views -->
</android.gesture.GestureOverlayView>   

这是我想要的画(黄线),但它没有触发任何方法.这是我实施的方式OnGesturePerformedListener:

    /*
     * Gestures
     */
    gLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
    if (!gLibrary.load()) { finish(); }
    GestureOverlayView gestureOverlayView = (GestureOverlayView) findViewById(R.id.gOverlay);
    gestureOverlayView.addOnGesturePerformedListener(gestureListener);  

这是gestureListener:

private OnGesturePerformedListener gestureListener = new OnGesturePerformedListener() {
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
        ArrayList<Prediction> predictions = gLibrary.recognize(gesture);            
        if (predictions.size() > 1) {
            for(Prediction prediction: predictions){
                Log.d("Test", "Looking for gestures");
            }
        }
    }
};

就这样.在墙上,我在不同的Activity中尝试了这个源代码,它没有ScrollView并且工作正常.

最后,我不确定它是关于GestureDetector的,所以这就是app如何使用探测器:

public boolean dispatchTouchEvent(MotionEvent ev) {
    if (detector != null) {
        if (detector.onTouchEvent(ev)) {
            return true;
        }
    }
    return super.dispatchTouchEvent(ev);
}

我的SwipeDetector:

private class SwipeDetector extends SimpleOnGestureListener {
    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;
    public boolean onFling(android.view.MotionEvent e1, android.view.MotionEvent e2, float velocityX, float velocityY) {
        if( Math.abs( e1.getY() - e2.getY() ) > SWIPE_MAX_OFF_PATH ) { return false; }
        if( e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs( velocityX ) > SWIPE_THRESHOLD_VELOCITY ) { return false; }
        if( e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs( velocityX ) > SWIPE_THRESHOLD_VELOCITY ) {  filterButton.performClick();return true; }          
        return false;
    }
}

我的做法有什么问题？

Answer 1

android中的所有触摸事件都是从孩子到父母.因此,滚动视图处理所有触摸事件,并且您的手势检测器不会接收它们.您可以设置触摸侦听器ScrollView:

    scrollView.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (detector != null) {
                return detector.onTouchEvent(event);
            return false;
        }
    });

您必须检查滚动是否正常工作,并且您不会消耗滚动事件.