java.lang.ClassCastException：ish.message.Message不能转换为android.app.Application

我正在制作一个应用程序，该应用程序抛出“ClassCastException：无法转换为android.app.Application”。我已经提到了stackoverflow上的各种类似的问题，但没有答案解决我的问题。java.lang.ClassCastException：ish.message.Message不能转换为android.app.Application

这里是我的代码：

MainActivity.java：

public class MainActivity extends ListActivity { 

private List<Note> posts; 

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


    //gets current user 
    ParseUser currentUser = ParseUser.getCurrentUser(); 

    //checks if a user has already logged in 
    if (currentUser == null) { 

     //loads the sign in/sign up page 
     loadLoginView(); 
    } 


    //now after a user has logged in... 

    //creates an array adapter to hold the posts 
    posts = new ArrayList<Note>(); 
    ArrayAdapter<Note> adapter = new ArrayAdapter<Note>(this, 
      R.layout.list_item_layout, posts); 
    setListAdapter(adapter); 

    //Refreshes posts 
    refreshPostList(); 
} 



private void loadLoginView() { 
    Intent intent = new Intent(this, LoginActivity.class); 
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); 
    startActivity(intent); 
} 







@Override 
protected void onListItemClick(ListView l, View v, int position, long id) { 

    Note note = posts.get(position); 
    Intent intent = new Intent(this, EditNoteActivity.class); 
    intent.putExtra("noteId", note.getId()); 
    intent.putExtra("noteTitle", note.getTitle()); 
    intent.putExtra("noteContent", note.getContent()); 
    startActivity(intent); 

} 

private void refreshPostList() { 

    //query gets access to posts in parse 
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Post"); 
    query.whereEqualTo("author", ParseUser.getCurrentUser()); 


    setProgressBarIndeterminateVisibility(true); 

    query.findInBackground(new FindCallback<ParseObject>() { 

     @SuppressWarnings("unchecked") 
     @Override 
     public void done(List<ParseObject> postList, ParseException e) { 
      setProgressBarIndeterminateVisibility(false); 
      if (e == null) { 
       // If there are results, update the list of posts 
       // and notify the adapter 
       posts.clear(); 
       for (ParseObject post : postList) { 
        Note note = new Note(post.getObjectId(), post 
          .getString("title"), post.getString("content")); 
        posts.add(note); 
       } 
       ((ArrayAdapter<Note>) getListAdapter()) 
         .notifyDataSetChanged(); 
      } else { 

       Log.d(getClass().getSimpleName(), "Error: " + e.getMessage()); 
      } 

     } 

    }); 

} 
}

Android清单：

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

<uses-sdk 
    android:minSdkVersion="11" 
    android:targetSdkVersion="21" /> 

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 

<application 
    android:name=".Message" 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name=".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> 

    <activity 
     android:name=".EditNoteActivity" 
     android:label="@string/title_activity_edit_note" > 
     <meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="ish.message.MainActivity" /> 
    </activity> 
    <activity 
     android:name=".LoginActivity" 
     android:label="@string/title_activity_login" > 
    </activity> 
    <activity 
     android:name=".SignUpActivity" 
     android:label="@string/title_activity_sign_up" > 
     <meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="ish.message.LoginActivity" /> 
    </activity> 
    <activity 
     android:name=".Users" 
     android:label="@string/title_activity_users" > 
     <meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="ish.message.MainActivity" /> 
    </activity> 
    <activity 
     android:name=".Message" 
     android:label="@string/title_activity_message" > 
    </activity> 
    <activity 
     android:name=".EditTextMessage" 
     android:label="@string/title_activity_edit_text_message" > 
    </activity> 
</application>

logcat的痕迹：

09-18 21:24:44.507: E/AndroidRuntime(19919): FATAL EXCEPTION: main 
09-18 21:24:44.507: E/AndroidRuntime(19919): java.lang.RuntimeException: Unable to instantiate application ish.message.Message: java.lang.ClassCastException: ish.message.Message cannot be cast to android.app.Application 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.LoadedApk.makeApplication(LoadedApk.java:501) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4263) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.ActivityThread.access$1400(ActivityThread.java:143) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1301) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.os.Looper.loop(Looper.java:137) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.ActivityThread.main(ActivityThread.java:4960) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at java.lang.reflect.Method.invokeNative(Native Method) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at java.lang.reflect.Method.invoke(Method.java:511) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at dalvik.system.NativeStart.main(Native Method) 
09-18 21:24:44.507: E/AndroidRuntime(19919): Caused by: java.lang.ClassCastException: ish.message.Message cannot be cast to android.app.Application 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.Instrumentation.newApplication(Instrumentation.java:997) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.Instrumentation.newApplication(Instrumentation.java:982) 
09-18 21:24:44.507: E/AndroidRuntime(19919): at android.app.LoadedApk.makeApplication(LoadedApk.java:496) 
09-18 21:24:44.507: E/AndroidRuntime(19919): ... 11 more

如有需要，请随时索取更多详情。

来源

2014-09-18 Ish

什么是'消息'？是扩展Application还是Activity？ – Rustam 2014-09-18 16:40:09

@Rustam消息是我的应用程序的名称。另外我有一个名为Message的列表活动。 – Ish 2014-09-18 16:46:01

在AndroidMenifest.xml.

android:name=".Message"在Application标签删除android:name=".Message"从Application标签意味着你有一类extends Application类。

来源

2014-09-18 16:55:51 Rustam

非常感谢。有效！ – Ish 2014-09-18 17:02:13

java.lang.ClassCastException：ish.message.Message不能转换为android.app.Application

回答

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