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Start your free trialManas Vijaywargiya
12,598 PointssetChecked method
Lastly, retrieve the saved value in onCreate and set the state of the CheckBox. If there isn't a saved value, the CheckBox should NOT be checked. Hint: Use the setChecked method.
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 mSharedPreferences;
private SharedPreferences.Editor mEditor;
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();
mSharedPreferences.getBoolean(KEY_CHECKBOX, "");
mCheckBox.setChecked(true);
}
@Override
protected void onPause() {
super.onPause();
mEditor.putBoolean(KEY_CHECKBOX, mCheckBox.isChecked());
mEditor.apply();
}
}
1 Answer
Ryan Lentz
9,191 PointsIf there is a saved value, you want mCheckBox to have that value. If there is no saved value, you want mCheckBox to be false. Perfect place for an if/else block.
Replace:
mSharedPreferences.getBoolean(KEY_CHECKBOX, "");
mCheckBox.setChecked(true);
With:
if (mSharedPreferences.getBoolean(KEY_CHECKBOX, false)) {
mCheckBox.setChecked(true);
} else {
mCheckBox.setChecked(false);
}