消费后如何向儿童发送触摸事件

Question

布局如下：

View 1是一个自定义的布局FlipperLayout，View 2是一个扩展的ListView PinnedHeaderListView，我想添加一个“pull to refresh”功能。视图1需要收听触摸事件才能向左或向右翻转。视图2也需要触摸事件。问题是，如果View 1消耗了触摸事件，则View 2无法获取它。

即使View 1消耗了该事件，我怎样才能将事件发送到View 2？

Answer 1

考虑以下自定义布局：

class FlingLinearLayout extends LinearLayout {

    private GestureDetector mDetector;

    public FlingLinearLayout(Context context) {
        super(context);
        setOrientation(LinearLayout.VERTICAL);
        OnGestureListener listener = new SimpleOnGestureListener() {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                Log.d(TAG, "onFling vx: " + velocityX + ", vy: " + velocityY);
                if (Math.abs(velocityX) > Math.abs(velocityY)) {
                    String text = (velocityX > 0? "left to right" : "right to left") + " fling";
                    Toast.makeText(getContext(), text, Toast.LENGTH_LONG).show();
                    return true;
                }
                return false;
            }
        };
        mDetector = new GestureDetector(context, listener);
        setBackgroundColor(0xaaff0000);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //Log.d(TAG, "onTouchEvent " + event);
        // handle own events (initiated in red area)
        mDetector.onTouchEvent(event);
        return true;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        //Log.d(TAG, "onInterceptTouchEvent " + ev);
        // handle child events
        // note: if you horizontally fling over button its onClick() is not performed
        return mDetector.onTouchEvent(ev);
    }
}

及其在您的活动中的用法：

ViewGroup ll = new FlingLinearLayout(this);
Button b;
OnClickListener l = new OnClickListener() {
    @Override
    public void onClick(View v) {
        Button b = (Button) v;
        Log.d(TAG, "onClick " + b.getText());
    }
};
b = new Button(this);
b.setText("first");
b.setOnClickListener(l);
ll.addView(b);
b = new Button(this);
b.setText("second");
b.setOnClickListener(l);
ll.addView(b);
b = new Button(this);
b.setText("third");
b.setOnClickListener(l);
ll.addView(b);
setContentView(ll);

Answer 2

touch事件返回一个布尔值，指定是否消耗了事件，只返回false，并且事件将继续隧道到子视图