以编程方式模拟平滑的拖动事件 [英] Simulate smooth Drag Event programmatically

问题描述

我使用了自定义 DragLinearLayout 。我使用 addDragView（）添加的所有子级都是可拖动的（用户交互）。

我想为单击的视图模拟拖动事件（顺利移至底部）

I used custom DragLinearLayout. All child I added using addDragView() are draggable (user interaction).
I want to simulate Drag Event for clicked View (smooth move to the bottom of Layout).

ACTION_DOWN -> ACTION_MOVE -> ACTION_UP

我尝试了此代码，但没有用。

I tried this code, but it didn't work.

long downTime = SystemClock.uptimeMillis();
long eventTime = SystemClock.uptimeMillis();
float x = view.getLeft();
float y = view.getTop();
int metaState = 0;
MotionEvent downEvent = MotionEvent.obtain(
                            downTime,
                            eventTime + 1000,
                            MotionEvent.ACTION_DOWN,
                            x,
                            y,
                            metaState
                    );
view.dispatchTouchEvent(downEvent);

MotionEvent moveEvent = MotionEvent.obtain(
                            downTime,
                            eventTime + 1000,
                            MotionEvent.ACTION_MOVE,
                            x,
                            y + 300,
                            metaState
                    );
view.dispatchTouchEvent(moveEvent);

MotionEvent upEvent = MotionEvent.obtain(
                            downTime,
                            eventTime + 1001,
                            MotionEvent.ACTION_UP,
                            x,
                            y + 300,
                            metaState
                    );
view.dispatchTouchEvent(upEvent);

推荐答案

我遇到了同样的问题，我不得不模拟

I had the same problem, I had to simulate the listview to overscroll.

经过一些调整后，我成功完成了工作。

After some tweak, I successfully did the work.

这是我所做的： （ overScrollDown（）是我的自定义ListView中的函数）

Here is what I did: (overScrollDown() is a function in My Custom ListView)

您可以在此要点。还要截屏

public void overScrollDown() {
    post(new Runnable() {
        @Override
        public void run() {
            final MotionEvent event = MotionEvent.obtain(System.currentTimeMillis(), System.currentTimeMillis(), MotionEvent.ACTION_DOWN, getWidth() / 2, getHeight() / 2, 0);
            dispatchTouchEvent(event);
            event.recycle();
        }
    });

    postDelayed(new Runnable() {
        @Override
        public void run() {
            final MotionEvent event = MotionEvent.obtain(System.currentTimeMillis(), System.currentTimeMillis(), MotionEvent.ACTION_MOVE, getWidth() / 2, getHeight() / 2, 0);
            dispatchTouchEvent(event);
            event.recycle();
        }
    }, 50);

    postDelayed(new Runnable() {
        @Override
        public void run() {
            final MotionEvent event = MotionEvent.obtain(System.currentTimeMillis(), System.currentTimeMillis(), MotionEvent.ACTION_MOVE, getWidth() / 2, getHeight() / 2 + 400, 0);
            dispatchTouchEvent(event);
            event.recycle();
        }
    }, 100);

    postDelayed(new Runnable() {
        @Override
        public void run() {
            final MotionEvent event = MotionEvent.obtain(System.currentTimeMillis(), System.currentTimeMillis(), MotionEvent.ACTION_UP, getWidth() / 2, getHeight() / 2 + 400, 0);
            dispatchTouchEvent(event);
            event.recycle();
        }
    }, 3000);
}

Btw。使用更多 ACTION_MOVE 事件可以方便地进行向下滚动操作。

Btw. the scroll down operation can be smooth with more ACTION_MOVE Event..

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