Question

我是Android的新手。我使用SimpleAdapter生成了Listview。 ListView连续显示3个文本视图。我想再添加一个textview并保持隐藏，直到用户滑动Listview行，即当用户滑动所有4个textview时应该是可见的。任何人都可以建议我如何做到这一点。任何链接或教程都会有所帮助。

Answer 1

从开发者文档中查看design pattern和how to implement it。

Answer 2

所以你想要的是一个固定高度的ListView。应用layout_weight属性来控制ListView和其他对象的高度。我猜ListView下面还有其他对象，否则你不希望它有一个固定的高度。

Answer 3

1st：你必须创建自己的自定义列表视图。

第二名：使用此

    navigaList.setOnTouchListener(swipeDetector);
navigaList.setOnItemClickListener(listener);

OnItemClickListener listener = new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                            long arg3) {
        if(swipeDetector.swipeDetected()) {
            if(swipeDetector.getAction() == Action.RL) {

            } else {

            }
        }        
    };

然后你必须使用这个类

来检测滑动

public class SwipeDetector implements View.OnTouchListener {

public static enum Action {
    LR, // Left to Right
    RL, // Right to Left
    TB, // Top to bottom
    BT, // Bottom to Top
    None // when no action was detected
}

private static final String logTag = "SwipeDetector";
private static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
private Action mSwipeDetected = Action.None;

public boolean swipeDetected() {
    return mSwipeDetected != Action.None;
}

public Action getAction() {
    return mSwipeDetected;
}

public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN: {
        downX = event.getX();
        downY = event.getY();
        mSwipeDetected = Action.None;
        return false; // allow other events like Click to be processed
    }
    case MotionEvent.ACTION_MOVE: {
        upX = event.getX();
        upY = event.getY();

        float deltaX = downX - upX;
        float deltaY = downY - upY;

        // horizontal swipe detection
        if (Math.abs(deltaX) > MIN_DISTANCE) {
            // left or right
            if (deltaX < 0) {
                Logger.show(Log.INFO,logTag, "Swipe Left to Right");
                mSwipeDetected = Action.LR;
                return true;
            }
            if (deltaX > 0) {
                Logger.show(Log.INFO,logTag, "Swipe Right to Left");
                mSwipeDetected = Action.RL;
                return true;
            }
        } else 

            // vertical swipe detection
            if (Math.abs(deltaY) > MIN_DISTANCE) {
                // top or down
                if (deltaY < 0) {
                    Logger.show(Log.INFO,logTag, "Swipe Top to Bottom");
                    mSwipeDetected = Action.TB;
                    return false;
                }
                if (deltaY > 0) {
                    Logger.show(Log.INFO,logTag, "Swipe Bottom to Top");
                    mSwipeDetected = Action.BT;
                    return false;
                }
            } 
        return true;
    }
    }
    return false;
}

}

希望这会对你有所帮助:)。

你可能会读到这个： here

如何在Android中滑动ListView行？

3 个答案: