Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Jonathan Boisvert
Jonathan Boisvert
4,582 Points

./MainActivity.java:24: error: method isChecked in class CheckBox cannot be applied to given types,Trouble with boolean

android activity lifecycle, Challenge 4/4 not finding a solution to this problem, missing the concept here?

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();
  }

  @Override
  protected void onPause () {
    super.onPause();
    if (mSharedPreferences.getBoolean(KEY_CHECKBOX, mCheckBox.isChecked(false))) {
    mCheckBox.setChecked(true);
  } else {
    mCheckBox.setChecked(false);
    }
  }
}

1 Answer

Seth Kroger
Seth Kroger
56,413 Points

isChecked() doesn't take any arguments but I'm not entirely sure you should be using it for a default value. Also you should be saving the in onPause() not setting it from prefs. That should happen in onResume().