首次运行时布局动画无法正常工作

我有一个带有项目列表的Activity，当您单击一个项目时，我希望该项目的播放控件从屏幕底部向上滑动并变得可见。我已经为滑入和滑出定义了一个动画集，并且它们有效。我在我的Activity中设置了动画监听器，并在单击项目时启动了滑入动画。我的问题是，第一次运行应用程序时，当我单击项目时，onClick回调被执行，但动画不会发生。第二次单击时，滑入动画发生了，但滑出动画没有发生。第三次及以后，它按预期工作。这是我的动画集。
vm_slide_in.xml

    <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" 
           android:fillAfter="true">
    <translate
        android:fromYDelta="800"
        android:toYDelta="0"
        android:duration="600" />
</set>

vm_slide_out.xml

：这是一个XML文件名，与VM滑动动画相关。

    <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" 
           android:fillAfter="true">
    <translate
        android:fromYDelta="0"
        android:toYDelta="800"
        android:duration="600" />
</set>

这是我的活动布局

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/AppBG">
    <RelativeLayout 
        style="@style/LogoBar" 
        android:id="@+id/logo_bar"      
        android:layout_alignParentTop="true">
        <include layout="@layout/logobar"></include>
    </RelativeLayout>
    <RelativeLayout 
        style="@style/TitleBar" 
        android:id="@+id/title_bar"     
        android:layout_below="@+id/logo_bar">
        <include layout="@layout/titlebar"></include>"
        <Button style="@style/TitleBarButton"
            android:id="@+id/vm_speaker_btn"
            android:text="@string/vm_speaker_btn_label" 
            android:layout_alignParentLeft="true"
            android:layout_margin="4dp">
        </Button>
        <Button style="@style/TitleBarButton"
            android:id="@+id/vm_edit_btn"
            android:text="@string/vm_edit_btn_label" 
            android:layout_alignParentRight="true"
            android:layout_margin="4dp">
        </Button>
    </RelativeLayout>
    <ListView
        android:id="@+id/@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/title_bar"/>
    <RelativeLayout
        android:id="@+id/vm_control_panel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/footer"
        android:visibility="gone">
        <include layout="@layout/vm_control"/>
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/footer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true">
        <include layout="@layout/taskbar"/>
    </RelativeLayout>
</RelativeLayout>

这是所包含控件的布局

    <?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
    <RelativeLayout 
        android:id="@+id/vm_control"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/dark_grey">
        <TextView
            android:id="@+id/vm_ctl_branding"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="5dp"
            android:text="@string/branding"
            android:textColor="@color/white">
        </TextView>
        <TextView style="@style/TimeMark"
            android:id="@+id/vm_timestamp"
            android:layout_toLeftOf="@+id/vm_progress"
            android:layout_below="@+id/vm_ctl_branding"
            android:layout_marginRight="3dp"
            android:text="0:00">
        </TextView>
        <SeekBar
            android:id="@+id/vm_progress"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_below="@+id/vm_ctl_branding"
            android:layout_centerHorizontal="true">
        </SeekBar>
        <TextView style="@style/TimeMark"
            android:id="@+id/vm_timeleft"
            android:layout_toRightOf="@+id/vm_progress"
            android:layout_below="@+id/vm_ctl_branding"
            android:layout_marginLeft="3dp"
            android:text="-0:00">
        </TextView>
        <LinearLayout
            android:id="@+id/vm_action_button_layout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/vm_timestamp"
            android:layout_alignRight="@+id/vm_timeleft"
            android:orientation="horizontal"
            android:layout_below="@+id/vm_progress">
            <TextView style="@style/Vm_Action_Button"
                android:background="@drawable/vm_action_btn_call"
                android:id="@+id/vm_callback_btn"
                android:layout_marginRight="5dp"
                android:text="@string/vm_action_btn_callback">
            </TextView>
            <TextView style="@style/Vm_Action_Button"
                android:background="@drawable/vm_action_btn_delete"
                android:id="@+id/vm_delete_btn"
                android:layout_marginLeft="5dp"
                android:text="@string/vm_action_btn_delete">
            </TextView>
        </LinearLayout>
    </RelativeLayout>
</merge>

从我的onCreate方法开始...

// Handle list item selections
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        final Voicemail vmItem = (Voicemail) vmla.getItem(position);
        Toast.makeText(ctx, "Name: " + vmItem.getCallerName() + " Position: " + position, Toast.LENGTH_SHORT)
                .show();
        vVm_controls.startAnimation(mSlideIn);
    }
});

我的动画回调函数...

@Override
public void onAnimationStart(Animation animation) {
    vm_controls_in = !vm_controls_in;
    if (vm_controls_in) {
        vVm_controls.setVisibility(View.GONE);
    } else {
        vVm_controls.setVisibility(View.VISIBLE);
        // vVm_controls.bringToFront();
    }
}

@Override
public void onAnimationEnd(Animation animation) {
    if (!vm_controls_in) {
        try {
            Thread.sleep(1000);
            vVm_controls.startAnimation(mSlideOut);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

@Override
public void onAnimationRepeat(Animation animation) {
    // TODO Auto-generated method stub

}