Android 在xml中扩展类集时出错

Android 在xml中扩展类集时出错,android,android-layout,android-animation,Android,Android Layout,Android Animation,我试图创建一个textView,它会在屏幕上滑动,并产生错误,但我不知道为什么。这是我的xml: <set xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent"

我试图创建一个
textView
,它会在屏幕上滑动,并产生错误,但我不知道为什么。这是我的xml:

<set xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillAfter="true">

    <scale
        android:duration="500"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:interpolator="@android:anim/linear_interpolator"
        android:toXScale="1.0"
        android:toYScale="0.0" />

    <TextView
        android:id="@+id/scroll_message"
        android:text="@string/scroll_text"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:minLines="1"
        android:maxLines="10"
        android:width="250dp"
        android:textColor="@android:color/black"
        android:textStyle="bold" />

</set>
给出的错误是:

            09-10 09:02:47.117  31292-31292/com.example.rsa.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.rsa.myapplication, PID: 31292
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rsa.myapplication/com.example.rsa.myapplication.MyActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class set
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2255)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2317)
        at android.app.ActivityThread.access$800(ActivityThread.java:143)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1258)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5070)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)
 Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class set
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:753)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:478)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:410)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:361)
        at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350)
        at android.app.Activity.setContentView(Activity.java:2122)
        at com.example.ranjeev.myapplication.MyActivity.onCreate(MyActivity.java:23)
        at android.app.Activity.performCreate(Activity.java:5720)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1102)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2208)
什么会导致这个错误


使用代码中的动画集,如下所示:

public void onResume(){
    super.onResume();
    textView.startAnimation(AnimationUtils.loadAnimation(getActivity(), R.anim.slide_up));
}

您好……当我使用此代码时,它会在
R.anim.slide\u up
上出错,并说“错误:找不到符号变量
anim
我假设您将动画集保存在
anim
资源文件夹中,作为名为
slide\u up.xml
的xml文件。你应该认真阅读《Android开发者指南》中的动画:不,名为
activity\u my
的xml文件在布局文件夹中。创建
anim
文件夹仍会显示相同的错误。
public void onResume(){
    super.onResume();
    textView.startAnimation(AnimationUtils.loadAnimation(getActivity(), R.anim.slide_up));
}