Question

如果ListView中嵌套HorizontalScrollView怎么解决滑动错乱

Answer 1

最近在开发中遇到HorizontalScrollView嵌套ScrollView导致滑动卡的情况，急横向水平滑动的View和垂直水平滑动的View，都在接收处理滑动时间，但是这种情况下触摸事件就会发生冲突。导致滑动非常卡，甚至出现程序停止响应。这种情况下我们需要重写view。下面是两个简单的例子，重写水平滑动View只接收水平方向上滑动的事件。我们使用手势GestureDetector来作区分。

<em>import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.HorizontalScrollView;

public class CustomHScrollView extends HorizontalScrollView{
private GestureDetector mGestureDetector;
private View.OnTouchListener mGestureListener;

private static final String TAG = "CustomHScrollView";

/**
* @function CustomHScrollView constructor
* @param context Interface to global information about an application environment.
*
*/
public CustomHScrollView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mGestureDetector = new GestureDetector(new HScrollDetector());
setFadingEdgeLength(0);
}

/**
* @function CustomHScrollView constructor
* @param context Interface to global information about an application environment.
* @param attrs A collection of attributes, as found associated with a tag in an XML document.
*/
public CustomHScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
mGestureDetector = new GestureDetector(new HScrollDetector());
setFadingEdgeLength(0);
}

/**
* @function CustomHScrollView constructor
* @param context Interface to global information about an application environment.
* @param attrs A collection of attributes, as found associated with a tag in an XML document.
* @param defStyle style of view
*/
public CustomHScrollView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
mGestureDetector = new GestureDetector(new HScrollDetector());
setFadingEdgeLength(0);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
}

// Return false if we're scrolling in the y direction
class HScrollDetector extends SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
if(Math.abs(distanceX) > Math.abs(distanceY)) {
return true;
}

return false;
}
}

} </em>

Answer 2

ListView 中嵌套HorizontalScrollView会让listView丢焦点

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