备份管理器不工作

好的。我阅读了文档：here和here，无论如何都无法备份我的首选项。我的代码： AndroidManifest：备份管理器不工作

<application android:allowBackup="true" android:label="@string/app_name" 
    android:icon="@mipmap/ic_launcher" android:theme="@style/AppTheme" 
    android:backupAgent="TheBackupAgent" android:restoreAnyVersion="true"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN"/> 
      <category android:name="android.intent.category.LAUNCHER"/> 
     </intent-filter> 
    </activity> 
    <meta-data android:name="com.google.android.backup.api_key" android:value="AEdPqrEAAAAIGyGIg_B8K6KrtT06kRX_YljuwtOxzKYHBZ_H0A" /> 
</application>

我的主要活动：

package com.settings.backup.casper.backupsettings; 

public class MainActivity extends Activity{ 
private EditText txtContainer; 
private Button btnSave; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main_activity); 
    BackupManager bm = new BackupManager(this); 
    bm.dataChanged(); 
    bm.requestRestore(new RestoreObserver() { 
     @Override 
     public void restoreStarting(int numPackages) { 
      super.restoreStarting(numPackages); 
     } 
    }); 

    txtContainer = (EditText) findViewById(R.id.txtPreferences); 
    btnSave = (Button) findViewById(R.id.btnSave); 
    SharedPreferences preferences = getSharedPreferences(TheBackupAgent.PREFS_NAME, MODE_PRIVATE); 
    txtContainer.setText(preferences.getString("prf", "")); 

    btnSave.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      SharedPreferences preferences = getSharedPreferences(TheBackupAgent.PREFS_NAME, MODE_PRIVATE); 
      SharedPreferences.Editor editor = preferences.edit(); 
      editor.putString("prf", txtContainer.getText().toString()); 
      editor.commit(); 
      TheBackupAgent.requestBackup(getBaseContext()); 
     } 
    }); 
} 
}

我BackupAgentHelper的工具：

package com.settings.backup.casper.backupsettings; 

public class TheBackupAgent extends BackupAgentHelper { 
// The name of the SharedPreferences file 
static final String PREFS_NAME = "myprefs"; 
// A key to uniquely identify the set of backup data 
static final String PREFS_BACKUP_KEY = "myprefs"; 

@Override 
public void onCreate() { 
    SharedPreferencesBackupHelper helper = new SharedPreferencesBackupHelper(this, PREFS_NAME); 
    addHelper(PREFS_BACKUP_KEY, helper); 
    Log.d("Test", "Adding backupagent..."); 
} 

@Override 
public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws IOException { 
    super.onRestore(data, appVersionCode, newState); 
} 

@Override 
public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) throws IOException { 
    super.onBackup(oldState, data, newState); 
} 

public static void requestBackup(Context context) { 
    BackupManager bm = new BackupManager(context); 
    bm.dataChanged(); 
} 
}

我知道Android不立即背包数据AFTE r调用dataChanged（）;这就是为什么我使用adb shell作为android.dev上的例子，但是当我重新安装应用程序时它不会恢复。在手机选项中，我启用备份。我尝试了3种不同的手机这个代码。有人知道为什么它不起作用吗？

来源

2015-04-23 user3927708

尝试onCreate()去除

bm.requestRestore(new RestoreObserver() { 
     @Override 
     public void restoreStarting(int numPackages) { 
      super.restoreStarting(numPackages); 
     } 
    });

和bm.dataChanged();是没有必要的。

来源

2015-09-09 20:01:29 sh0m1

备份管理器不工作

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