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Start your free trialmichael lee
5,179 Pointshow to set the string value to the check?
in my code I am trying to convert String into check value in order to retrieve, but can't find a way to do that
import android.view.View;
import android.os.Bundle;
public class MainActivity extends Activity {
public CheckBox mCheckBox;
static final String PREFS_FILE = "com.teamtreehouse.sharedpreferencesapp.preferences";
static final String KEY_CHECKBOX = "KEY_CHECKBOX";
private SharedPreferences mSharedPreferences;
private SharedPreferences.Editor mEditor;
@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();
CheckBox editTextCheck= mSharedPreferences.getString(KEY_CHECKBOX, "");
mCheckBox.setChecked(editTextCheck);
}
@Override
protected void onPause() {
super.onPause();
mEditor.putBoolean(KEY_CHECKBOX, mCheckBox.isChecked());
mEditor.apply();
}
}
1 Answer
Lauren Moineau
9,483 PointsHi Michael. Let's have a look at your code retrieving the stored value:
CheckBox editTextCheck= mSharedPreferences.getString(KEY_CHECKBOX, "");
As with a Bundle, remember that whatever you're putting in, you're getting out. It won't change type in between. In onPause(), you saved a Boolean in SharedPreferences, using putBoolean(). So here, you need to get a Boolean, not a String.
Now, because it's a Boolean, you'll have to save it in a new Boolean variable, just like Ben created a String variable to store that retrieved String value in the video.
Finally, because it's a Boolean and not a String, you can't give an empty String as the default value (""). The instructions say : "If there isn't a saved value, the CheckBox should NOT be checked."
Hint: Remember that a Boolean can only have 2 values: true or false. So which should we put as default here so that the checkbox is not checked?
Hope that helps you complete the challenge :)
michael lee
5,179 Pointsmichael lee
5,179 Pointsthanks a lot, Lauren. It is truly very helpful, I appreciate the detailed explanation~
Lauren Moineau
9,483 PointsLauren Moineau
9,483 PointsYou're very welcome Michael :)