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My intention is to implement a backup service for my application, storing within the cloud configuration properties when changes are made, and retrieving them when the application first starts.

But I'm having some problems: the backup process is not made correctly.

My Android Manifest contains the following:

<application
    ...
    android:label="@string/app_name"
    android:theme="@style/AppTheme" 
    android:allowBackup="true"
    android:backupAgent=".backup.BizkaimoveBackup">
        ...

        <!-- Android Backup -->
        <meta-data 
            android:name="com.google.android.backup.api_key" 
            android:value="--key--" />
        <!-- Android Backup -->

The BackupAgentHelper class contains:

public class BizkaimoveBackup extends BackupAgentHelper {

    /*
     * Atributos
     */
    private static String LOG_TAG = "BizkaimoveBackup";
    private SharedPreferencesBackupHelper spbh;

    /**
     * El nombre del fichero de SharedPreferences: el mismo que hay en globales.
     */
    private static String PREFS = "bizkaimovePrefs";

    /**
     * Una clave para identificar unequívocamente un conjunto de datos de backup
     */
    private static final String PREFS_BACKUP_KEY = "myprefs";

    /*
     * Métodos
     */
    @Override
    public void onCreate() {
        spbh = new SharedPreferencesBackupHelper(this, PREFS);
        addHelper(PREFS, spbh);
        Log.d(LOG_TAG, "Añadiendo BackupAgent...");
    }

}

To store changes in the cloud, I do the following: 

switchPreferenceIdiomaEs = (SwitchPreference) findPreference("pref_switch_idioma_es");
    switchPreferenceIdiomaEu = (SwitchPreference) findPreference("pref_switch_idioma_eu");

    switchPreferenceIdiomaEs.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            //newValue es boolean aquí
            SharedPreferences sp = getActivity().getSharedPreferences("bizkaimovePrefs", Context.MODE_PRIVATE);
            Editor spEditor = sp.edit();
            spEditor.putBoolean("idiomaEsCastellano", (Boolean) newValue);
            spEditor.putBoolean("idiomaEsEuskera", !((Boolean) newValue));
            spEditor.commit();
            switchPreferenceIdiomaEu.setChecked(!((Boolean) newValue));

            BackupManager.dataChanged("com.ingartek.bizkaimove");

            return true;
        }
    });

The XML preferencias.xml file contains the following:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:key="bizkaimovePrefs"
    android:persistent="true"
    android:id="@+id/listaPrefs">

    <PreferenceCategory
        android:title="@string/config_idioma">

        <!-- Un switch para euskera, otro para castellano -->
        <SwitchPreference 
            android:key="pref_switch_idioma_eu"
            android:title="@string/config_euskera"
            android:switchTextOn="@string/config_euskera"
            android:switchTextOff="@string/config_castellano"/>

        <SwitchPreference 
            android:key="pref_switch_idioma_es"
            android:title="@string/config_castellano"
            android:switchTextOn="@string/config_castellano"
            android:switchTextOff="@string/config_euskera"/>

    </PreferenceCategory>
    ...

And finally, within the onCreate() of the HomeActivity I do the following:

BackupManager bm = new BackupManager(this);
        bm.requestRestore(new RestoreObserver() {

            @Override
            public void restoreStarting(int numPackages) {
                Toast.makeText(getApplicationContext(), "Empezando recuperación de backup...", Toast.LENGTH_SHORT).show();
                super.restoreStarting(numPackages);
            }

            @Override
            public void restoreFinished(int error) {
                Toast.makeText(getApplicationContext(), "Recuperación de backup finalizada. Error: " + error, Toast.LENGTH_SHORT).show();
                super.restoreFinished(error);

However, after doing the actions described here http://developer.android.com/guide/topics/data/backup.html#Testing no data is retrieved after uninstalling my app.

I have been able to download and test this https://bitbucket.org/andreaskristensson/android-example-preference-fragment-and-backup-api/downloads but neither it isn't working.

What am I doing incorrectly?

Thanks in advance.

4

1 回答 1

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终于明白我的问题是什么了...

我创建了另一个文件，其中存储了一些首选项，其余的则保存在默认首选项 XML 文件中。

所以备份经理只与其中一个合作。

于 2016-02-11T12:02:39.910 回答