布局动画在第一次运行时不起作用

我有一个包含项目列表的活动，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为可见.我已经为滑入和滑出定义了一个动画集，它们可以工作.我已经在我的活动中设置了我的 animationListener 并在一个项目的 onClick 动画中开始了我的幻灯片.我的问题是，第一次运行应用程序时，当我点击一个项目时，onClick 回调被执行，但动画没有发生.第二次单击时，会出现动画中的幻灯片，但不会出现幻灯片.第三次及以后，它按预期工作.这是我的动画集.

I have an Activity with a list of items and when you click on an item, I want playback controls for that item to slide up from the bottom of the screen and become visible. I've defined an animation set for the slide in and the slide out and they work. I've setup my animationListener in my activity and started my slide in animation onClick of an item. My problem is, the first time I run the app, when I click on an item, the onClick callback is executed, but the animation doesn't happen. Second time I click, the slide in animation happens, but not the slide out. Third and subsequent times, it works as expected. Here are my animation sets.

vm_slide_in.xml

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

vm_slide_out.xml

    <?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 
          
        android:       
        android:layout_alignParentTop="true">
        <include layout="@layout/logobar"></include>
    </RelativeLayout>
    <RelativeLayout 
          
        android:      
        android:layout_below="@ id/logo_bar">
        <include layout="@layout/titlebar"></include>"
        <Button  
            android: 
            android:text="@string/vm_speaker_btn_label" 
            android:layout_alignParentLeft="true"
            android:layout_margin="4dp">
        </Button>
        <Button  
            android: 
            android:text="@string/vm_edit_btn_label" 
            android:layout_alignParentRight="true"
            android:layout_margin="4dp">
        </Button>
    </RelativeLayout>
    <ListView
        android: 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@ id/title_bar"/>
    <RelativeLayout
        android: 
        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: 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true">
        <include layout="@layout/taskbar"/>
    </RelativeLayout>
</RelativeLayout>

这是包含控件的布局

    <?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
    <RelativeLayout 
        android: 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/dark_grey">
        <TextView
            android: 
            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  
            android: 
            android:layout_toLeftOf="@ id/vm_progress"
            android:layout_below="@ id/vm_ctl_branding"
            android:layout_marginRight="3dp"
            android:text="0:00">
        </TextView>
        <SeekBar
            android: 
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_below="@ id/vm_ctl_branding"
            android:layout_centerHorizontal="true">
        </SeekBar>
        <TextView  
            android: 
            android:layout_toRightOf="@ id/vm_progress"
            android:layout_below="@ id/vm_ctl_branding"
            android:layout_marginLeft="3dp"
            android:text="-0:00">
        </TextView>
        <LinearLayout
            android: 
            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  
                android:background="@drawable/vm_action_btn_call"
                android: 
                android:layout_marginRight="5dp"
                android:text="@string/vm_action_btn_callback">
            </TextView>
            <TextView  
                android:background="@drawable/vm_action_btn_delete"
                android: 
                android:layout_marginLeft="5dp"
                android:text="@string/vm_action_btn_delete">
            </TextView>
        </LinearLayout>
    </RelativeLayout>
</merge>

从我的 onCreate 方法...

From my onCreate method...

// 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);
    }
});

还有我的动画回调...

And my animation callbacks...

@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

}