How do I make a checkbox stay in the same state every time I open my app?

Question

I have a checkbox on my activity. I'm wondering how to make its state stay the same (checked/unchecked) everytime I open my app.

Answer 1

You can use SharedPreferences to implement CheckBox which retains its state even if application is closed.

• When user checks/un-check CheckBox.Save it's state in Shared Preferences.
• Whenever user Opens your activity. Read previously saved value from Shared-Preferences, and set the state of check box.

Here is an Example code to for Saving state of checkbox even if app is closed.

public class TestActivity extends Activity{
    CheckBox checkBox = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        checkBox = (CheckBox) findViewById(R.id.my_check_box);
        boolean isChecked = getBooleanFromPreferences("isChecked");
        Log.i("start",""+isChecked);
        checkBox.setChecked(isChecked);
        checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton view, boolean isChecked) {
                Log.i("boolean",""+isChecked);
                TestActivity.this.putBooleanInPreferences(isChecked,"isChecked");
            }
        });
    }
    public void putBooleanInPreferences(boolean isChecked,String key){
        SharedPreferences sharedPreferences = this.getPreferences(Activity.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putBoolean(key, isChecked);
        editor.commit();        
    }
    public boolean getBooleanFromPreferences(String key){
        SharedPreferences sharedPreferences = this.getPreferences(Activity.MODE_PRIVATE);
        Boolean isChecked = sharedPreferences.getBoolean(key, false);
        return isChecked;       
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <CheckBox
        android:id="@+id/my_check_box"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

Answer 2

checkBox.setChecked(true);
If you want the last state, simply write the checked state to SharedPreferences in the onPause() method and get the state in the onResume() method.

Reference: http://developer.android.com/reference/android/widget/CheckBox.html http://developer.android.com/reference/android/content/SharedPreferences.html

Answer 3

Your best option is to implement SharedPreferences in your app and save it's state. When you run your app you retrieve the status from the preferences and check/uncheck the checkbox.

Answer 4

In order to remember application state, you will want to make use of the onSaveInstanceState() and onRestoreInstanceState() methods (see this answer for more info) to determine if the box should be checked or unchecked...

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  savedInstanceState.putBoolean("IsCheckboxChecked", _myCheckbox.isChecked());
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  _myCheckbox.setChecked(savedInstanceState.getBoolean("IsCheckboxChecked"));
}

Answer 5

Your best bet is to use SharedPreference. You can use it like this:

Save the current state to sharedpreference:

SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit(); //opens the editor
editor.putBoolean("isChecked", true); //true or false
editor.commit(); //saves it in shared preference

then when your activity starts you can check that value in the SharedPreference like this:

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

    SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);

    CheckBox checkBox = (CheckBox) findViewById(R.id.checkbox_id);
    checkBox.setChecked(sharedPreferences.getBoolean("isChecked", false));
}

Hope you can use this information