小编bha*_*rat的帖子

我GestureDetector.OnGestureListener在 Activity 中实现，其覆盖的 onTouchEvent 是：

public boolean onTouchEvent(MotionEvent event) {
       //gestureDetector is new GestureDetector(this,this) in Activity's onCreate()
       this.gestureDetector.onTouchEvent(event);
       return super.onTouchEvent(event);
    }

使用 MotionEvent 类中的 getEdgeFlags 进行边缘检测，如下所示：

 @Override
public boolean onDown(MotionEvent e) {
    final int edgeInfo = e.getEdgeFlags();
    return ((edgeInfo == MotionEvent.EDGE_LEFT) || (edgeInfo == MotionEvent.EDGE_RIGHT)) ||
            (edgeInfo == MotionEvent.EDGE_BOTTOM);
}

但是 onDown 总是返回 false。我也试过改变

final int edgeInfo = e.getEdgeFlags(); 到
final int edgeInfo = e.getAction() & e.getEdgeFlags();

以及final int edgeInfo = e.getActionMasked() & e.getEdgeFlags();以防万一。

却无济于事。

我看过 …

我正在编写一个非常基本的Home Launcher,我在AppsGridActivity中创建了一个类AppsInfoModel,一个CustomAdapter和一个GridView.

这是我在Activity中填充适配器的代码

    appsGrid = (GridView) findViewById(R.id.appsGrid);
    appsInfo = new AppsInfoModel(this);
    appsGrid.setAdapter(new CustomAdapter(this,appsInfo));

这是适配器

public class CustomAdapter extends BaseAdapter {

Context context;
AppsInfoModel appInfo;
CustomAdapter(Context context,AppsInfoModel appInfo) {
    this.context = context;
    this.appInfo = appInfo;
}

@Override
public int getCount() {
    return appInfo.getSize();
}

@Override
public Object getItem(int position) {
    return appInfo.getItem(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        LayoutInflater inflater = ((Activity) …