Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Android Android Activity Lifecycle Introducing SharedPreferences Saving and Retrieving Data with SharedPreferences

Arun Kumar
Arun Kumar
3,750 Points

Got stuck on challenge 4 of 4 Android Activity Lifecycle

Not sure what is wrong here i retrieve the value in a boolean and set the checkbox value to that of retrived boolean value and the default value is set to false

MainActivity.java
import android.view.View;
import android.os.Bundle;

public class MainActivity extends Activity {

  private static final String PREFS_FILE = "com.packagename.preferences";
  private static final String KEY_CHECKBOX = "KEY_CHECKBOX";

    private SharedPreferences.Editor mEditor;
    private SharedPreferences mSharedPreferences;

  public CheckBox mCheckBox;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mCheckBox = (CheckBox) findViewById(R.id.checkBox);

    mSharedPreferences = getSharedPreferences(PREFS_FILE, Context.MODE_PRIVATE);
    mEditor = mSharedPreferences.edit();

    boolean check = SharedPreferences.getBoolean(KEY_CHECKBOX,false);
    mCheckBox.setChecked(check);


  }

  @Override
  protected void onPause() {
    super.onPause();
    mEditor.putBoolean(KEY_CHECKBOX, mCheckBox.isChecked());
    mEditor.apply();
  }

}

1 Answer

Kourosh Raeen
Kourosh Raeen
23,732 Points

You are calling getBoolean on the SharedPreferences class. Instead, call it on mSharedPreferences:

boolean check = mSharedPreferences.getBoolean(KEY_CHECKBOX,false);
Arun Kumar
Arun Kumar
3,750 Points

Thanks!! Didn't notice that !programming without an IDE makes it tough to find what went wrong!