Account-related utility methods.

AccountUtils.java

import android.accounts.Account;
import android.accounts.AccountManager;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Build;
import android.preference.PreferenceManager;
 
import com.google.android.gms.auth.GoogleAuthUtil;
 
public class AccountUtils {
 
  private static final String KEY_ACCOUNT_NAME = "account_name";
 
  // Cache the currently logged in user in memory. This will cause
  // problems if you directly modify the shared preferences; all
  // modifications to the shared preferences must be made through
  // the AccountUtils utility class!
  private static String mCurrentUser = null;
 
  public static Account getGoogleAccountByName(Context ctx, String accountName) {
    if (accountName != null) {
      AccountManager am = AccountManager.get(ctx);
      Account[] accounts = am.getAccountsByType(GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE);
      for (Account account : accounts) {
        if (accountName.equals(account.name)) {
          return account;
        }
      }
    }
    return null;
  }
 
  public static String getAccountName(Context ctx) {
    if (mCurrentUser != null) {
      return mCurrentUser;
    }
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(ctx);
    return prefs.getString(KEY_ACCOUNT_NAME, null);
  }
 
  @TargetApi(Build.VERSION_CODES.GINGERBREAD)
  public static void setAccountName(Context ctx, String accountName) {
    Editor editor = PreferenceManager.getDefaultSharedPreferences(ctx).edit();
    editor.putString(KEY_ACCOUNT_NAME, accountName);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
      editor.apply();
    } else {
      editor.commit();
    }
    mCurrentUser = accountName;
  }
 
  @TargetApi(Build.VERSION_CODES.GINGERBREAD)
  public static void removeAccount(Context ctx) {
    Editor editor = PreferenceManager.getDefaultSharedPreferences(ctx).edit();
    editor.remove(KEY_ACCOUNT_NAME);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
      editor.apply();
    } else {
      editor.commit();
    }
    mCurrentUser = null;
  }
}