整个对话框的Android onTouchListener

Question

我有一个对话框来选择文件.此对话框包含用于显示目录和文件的列表视图,并具有用于导航目的的onItemClickListener.

如何对目录结构中的fling事件做出反应？我尝试在根RelativeLayout上设置一个OnTouchListener来将触摸事件分派给我的GestureListener:

    final GestureDetector detector = new GestureDetector(new MyGestureDetector(tvCurrentPath));     
        dialog.findViewById(R.id.rlFilelist).setOnTouchListener(new OnTouchListener() {
            public boolean onTouch(View view, MotionEvent e) {
                detector.onTouchEvent(e);
                return false;
            }
        });

事件在onTouch()中注册,但onFling()方法永远不会在MyGestureDetector中调用.但是,如果我将OnTouchListener附加到列表视图,它将按预期工作.这种方法的问题在于listview并不总是充满数据,当它是空的或点击下面的项目时,没有触发onTouch()事件.

对话框布局:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rlFilelist"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:focusable="true" >    

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@+id/llButtons" >

        <TextView
            android:id="@+id/tvCurrentPath"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:layout_marginRight="10dip" >
        </TextView>

        <ListView
            android:id="@+id/lvFileListing"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_above="@id/llButtons"
            android:layout_below="@id/tvCurrentPath" >
        </ListView>
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/llButtons"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="5dip"
        android:layout_marginTop="5dip" >

        <Button
            android:id="@+id/btAddDirectory"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginRight="10px"
            android:text="@string/host_tv_dg_add_directory" />

        <Button
            android:id="@+id/btUp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10px"
            android:layout_toRightOf="@id/btAddDirectory"
            android:text="@string/host_tv_dg_navigate_up" />

        <Button
            android:id="@+id/btClose"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/btUp"
            android:text="@string/_tv_close" />
    </RelativeLayout>

</RelativeLayout>

没有完全填充lisview的对话框的屏幕截图:http://imageshack.us/photo/my-images/802/dialog.png/

如何在整个对话框或"整个"列表视图中触发onFling()事件,即使它没有完全填充项目？

谢谢!

Answer 1

您应该创建一个扩展对话框类的类,然后您可以创建一个手势检测器并附加到类的ontouchevent.这是一个代码示例:

public class GestureDialog extends Dialog {
    public GestureDialog (Context context, int theme) {
        super(context, theme);

        gestDetec = new MyGestureDetector();    //inital setup
        gestureDetector = new GestureDetector(gestDetec);   
        gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (gestureDetector.onTouchEvent(event))
            return true;
        else
            return false;
    }
class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

        System.out.println( "Help im being touched!" );
        return false;
    }
}

}