android - ClasscastException android.support.v7.widget.ShareActionProvider转换为action.view.ActionProvider

这个问题已经有了答案：
Unable to cast Action Provider to Share Action Provider
8答
下面是我的活动代码。
问题是我不能正确使用appcompat库，它给了我
ClasscastException android.support.v7.widget.ShareActionProvider to action.View.ActionProvider

   import android.content.Intent;
   import android.os.Bundle;
   import android.support.v4.view.MenuItemCompat;
   import android.support.v7.app.ActionBarActivity;
   import android.support.v7.widget.ShareActionProvider;
   import android.view.Menu;
   import android.view.MenuItem;

    public class MainActivity extends ActionBarActivity{
android.support.v7.widget.ShareActionProvider shareAction;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    MenuItem item =(MenuItem) menu.findItem(R.id.menu_settings);
    shareAction = (ShareActionProvider) MenuItemCompat
            .getActionProvider(item);
    shareAction.setShareIntent(createShareIntent());
    return true;
}

public Intent createShareIntent() {
    Intent share = new Intent(Intent.ACTION_SEND);
    share.setAction(Intent.ACTION_SEND).putExtra(Intent.EXTRA_TEXT, "TEST")
            .setType("text/plain");
    return share;
}

}

根据developer.android.com上的指南，我正确地使用了这个库
下面是我的菜单文件

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:easyshare="http://schemas.android.com/apk/res-auto">

<item
    android:id="@+id/menu_settings"
    android:orderInCategory="100"
    easyshare:showAsAction="ifRoom"
    easyshare:actionProviderClass="android.support.v7.widget.ShareActionProvider"
    />
  </menu>

**已编辑logcat输出**抱歉，之前我收到标签中给出的异常，但现在看到这个错误，不知何故找不到问题

    10-02 02:17:46.566: E/AndroidRuntime(896): FATAL EXCEPTION: main
    10-02 02:17:46.566: E/AndroidRuntime(896): java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$styleable
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:98)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
    10-02 02 :17:46.566: E/AndroidRuntime(896):     at net.mobitexter.easyshare.MainActivity.onCreate(MainActivity.java:16)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.app.Activity.performCreate(Activity.java:4465)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
    10-02 02:17:46.566: E/AndroidRuntime(896):  at android.app.ActivityThread.access$600(ActivityThread.java:127)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at android.os.Handler.dispatchMessage(Handler.java:99)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at android.os.Looper.loop(Looper.java:137)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at android.app.ActivityThread.main(ActivityThread.java:4448)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at java.lang.reflect.Method.invokeNative(Native Method)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at java.lang.reflect.Method.invoke(Method.java:511)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
     10-02 02:17:46.566: E/AndroidRuntime(896):     at dalvik.system.NativeStart.main(Native Method)
     10-02 02:18:02.152: I/Process(896): Sending signal. PID: 896 SIG: 9

*看看清单是否有用*
下面是我的清单文件的代码

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.mobitexter.easyshare"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="9"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="net.mobitexter.easyshare.MainActivity"
        android:label="@string/app_name"
         >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

最佳答案

你需要像这样替换shareactionprovider的角色

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
MenuItem item =(MenuItem) menu.findItem(R.id.menu_settings);
shareAction = (android.support.v7.widget.ShareActionProvider) item.getActionProvider();
shareAction.setShareIntent(createShareIntent());
return true;
}

它应该工作正常。请测试一下，告诉我它是否工作正常。