how to check the SharedPreferences string is empty or null *android

Question

I want to check a string in SharedPreferences used it to store username and password, so if username and password is not null or empty it will be directed to home, otherwise

Answer 1

 if(appSettings.contains(Constants.WEATHER_SUBN_POSTION)) {
        savedSubPostion = appSettings.getInt(Constants.WEATHER_SUBN_POSTION, 0);
 }

First check it contains the value.

Answer 2

public static final String DEFAULT_VALUE = "default";
public static final String ANY_FIELD = "any_field";

SharedPreferences prefs = context.getPreferences(Activity.MODE_PRIVATE);
String text = prefs.getString(ANY_FIELD, DEFAULT_VALUE);
if (text.equals(DEFAULT_VALUE)) {
    //TODO:
} else {
    //TODO:
}

Good luck!

Answer 3

Do this:

SharedPreferences myPrefs = this.getSharedPreferences("myPrefs", MODE_WORLD_READABLE);
String username = myPrefs.getString("USERNAME",null);
String password = myPrefs.getString("PASSWORD",null);

if username and password are present, they will have a value otherwise they will be null.

if (username != null && password != null )
{
    //username and password are present, do your stuff
}

You don't have to check their presence separately. Trying to retrieve their value will return null ( if not present ) or the value ( if present ) automatically.

Answer 4

Try this

  if(PreferenceConnector.getString("USERNAME")!=null){   
      Intent intent = new 
      Intent(MainActivity.this,MainHome_Activity.class);
      startActivity(intent);
   }
   else 
   {
     Intent intent = new Intent(MainActivity.this,LoginFormPegawai_Activity.class);
     startActivity(intent);
   }