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Start your free trialEnrique Hernández
2,822 PointsGot stuck on challenge 3 of 4 Android Activity Lifecycle
Override the onPause method. Then save the value of the CheckBox. Hint: Use isChecked() to get the value of the CheckBox, and use 'putBoolean' to store the value.
This is the code but i tried using the answers given and can't get this done.
import android.view.View; import android.os.Bundle;
public class MainActivity extends Activity {
public CheckBox mCheckBox; private static final String PREFS_FILE = "com.packagename.preferences"; private static final String KEY_CHECKBOX = "KEY_CHECKBOX"; private SharedPreferences.Editor mEditor; private SharedPreferences mSharedPreferences;
@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();
} }
import android.view.View;
import android.os.Bundle;
public class MainActivity extends Activity {
public CheckBox mCheckBox;
private static final String PREFS_FILE = "com.packagename.preferences";
private static final String KEY_CHECKBOX = "KEY_CHECKBOX";
private SharedPreferences.Editor mEditor;
private SharedPreferences mSharedPreferences;
@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();
}
}
2 Answers
Kourosh Raeen
23,733 PointsIn the onPause() method, call the putBoolean() method on the Editor instance mEditor. Pass in the key and the boolean value of the checkbox which you can get by calling isChecked() on mCheckBock. Finally, call apply() on the Editor instance.
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";
public CheckBox mCheckBox;
private SharedPreferences.Editor mEditor;
private SharedPreferences mSharedPreferences;
@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();
mEditor.putBoolean(KEY_CHECKBOX, mCheckBox.isChecked());
mEditor.apply();
}
}
Enrique Hernández
2,822 PointsThank you, it worked!