Calling SharedPreferences using application context.

If you wish not to pass context from your activity going to your Presenters and ViewModels when saving or retrieving your key-value data from SharedPreferences this might help you.

In your Application context:

public class MyApplication extends Application {

  private static Context context;

  @Override public void onCreate() {
    super.onCreate();
    context = getApplicationContext();
  }

  public static Context getContext() {
    return context;
  }
}

Usage:

PreferenceManager.getDefaultSharedPreferences(MyApplication.getContext());

I created a sample SharedPreferenceData class where you can save and retrieve your key-value data.

public class SharePreferenceData {

  private static final String TOKEN = "token";

  private SharedPreferences sharedPreferences;

  public static SharePreferenceData getInstance() {
    return new SharePreferenceData();
  }

  private SharePreferenceData() {
    this.sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MyApplication.getContext());
  }

  public void saveToken(final String token) {
    sharedPreferences.edit().putString(SharePreferenceData.TOKEN, token).apply();
  }

  public String getToken() {
    return sharedPreferences.getString(SharePreferenceData.TOKEN, StringUtils.EMPTY);
  }
}

Don’t forget to modify your AndroidManifest.xml file:

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

To learn more about SharedPreferences visit this link.