我的滑动抽屉测试不能正常工作

Question

我的SlidingDrawer测试反应错误，我开发的是为了从左到右工作，但它从右到左工作。

谁能告诉我我做错了什么？

我的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <SlidingDrawer
            android:id="@+id/slidingDrawer"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="horizontal"
            android:gravity="left"
            android:allowSingleTap="true"
            android:handle="@+id/handle"
            android:content="@+id/content">

            <ImageView
                android:contentDescription="content"
                android:id="@id/handle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/ic_action_sliding_to_right"/>

            <ImageView
                android:id="@+id/content"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/android_robot" />
    </SlidingDrawer>

</RelativeLayout>

我的活动

package com.pack.myslidingdrawer;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SlidingDrawer;
import android.widget.SlidingDrawer.OnDrawerCloseListener;
import android.widget.SlidingDrawer.OnDrawerOpenListener;
import android.widget.SlidingDrawer.OnDrawerScrollListener;
import android.widget.TextView;

public class MainActivity extends Activity {

    SlidingDrawer drawer;
    ImageView handle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        drawer = (SlidingDrawer)findViewById(R.id.slidingDrawer);
        handle     = (ImageView)findViewById(R.id.handle);

        drawer.setOnDrawerOpenListener(new OnDrawerOpenListener() {
                @Override
                public void onDrawerOpened() {
                    // Set another direction Icon 
                    ImageView view=(ImageView)drawer.getHandle();
                    view.setImageResource(R.drawable.ic_action_sliding_to_left);     
            }
        });

        drawer.setOnDrawerCloseListener(new OnDrawerCloseListener() {
                @Override
                public void onDrawerClosed() {
                    // Set another direction Icon
                    ImageView view=(ImageView)drawer.getHandle();
                    view.setImageResource(R.drawable.ic_action_sliding_to_right);
            }
        });

    }            
}

所以我理解SlidingDrawer android:orientation="horizontal"和android:gravity="left"确定水平方向以及handle应该在哪里，我错了吗？

我事先感谢你的帮助。