Question

我有一项活动，我希望能够在其上听滑动。我的活动中有一个ScrollView，一个大的TextView已经填满了该ScrollView的所有区域。为了启用对我整个活动的滑动，我扩展了Activity类并定义了SwipeActivity，如下所示：

public abstract class SwipeActivity extends Activity {

private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private int SWIPE_THRESHOLD_VELOCITY;
private GestureDetector gestureDetector;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    gestureDetector = new GestureDetector(new SwipeDetector());
    ViewConfiguration configuration = ViewConfiguration.get(this);
    SWIPE_THRESHOLD_VELOCITY = configuration.getScaledMinimumFlingVelocity();
}

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

        // 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) {
            rightSwipe();
            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);
}

protected abstract void rightSwipe();

protected abstract void leftSwipe();
}

现在，我可以在任何扩展SwipeActivity的活动上捕获rightSwipe()和leftSwipe()。所以，我宣布我的主要活动是这样的：

public class ContentActivity extends SwipeActivity implements OnLongClickListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Here I add a TextView programmatically to my Vertical ScrollView and set this activity to listen to its long clicks (touches)
        ScrollView scrollView = (ScrollView) findViewById(R.id.content_scroll);
        TextView textView = new TextView(ContentActivity.this);
        textView.setText("Some Really Long Text!");
        textView.setOnLongClickListener(this);
        scrollView.addView(textView);
    }      

    @Override
    public boolean onLongClick(View v) {
        return doLongClickAction();
    }

    @Override
    public void rightSwipe() {
        doSwipeAction();
    }

    @Override
    public void leftSwipe() {
        doSwipeAction();
    }

}

现在，所有内容都显示正常且垂直scrollView滚动正确，并且在textView上滑动操作和长按点击，除了一件事：

大约10次我在textView上滑动，3次同时启动doLongClickAction()和doSwipeAction()，这对用户来说并不友好。

我知道我的问题与触摸事件的碰撞有关，但经过几个小时的学习和测试后，我无法解决。你能告诉我我的错误在哪里吗？

（我应该补充一点：当我捕获点击而不是长时间点击TextView时，一切正常，但当用户点击textview中的链接时，会启动textview的onClick事件，然后打开浏览器！）

在TextView上滑动/ Fling也随机运行其onLongClick

0 个答案: