How to save a checkbox state in android app

Question

I have this app with a simple checkbox which adds a line to build.prop when the user presses it , the thing works but when i exit the app the check box is reseted , is there

Answer 1

Where did you get this extremely odd approach using getRuntime().exec()? Here's an easy working code sample for you using SharedPreferences. Replace your whole switch-statement with this one:

switch(view.getId()) {
case R.id.checkBox1:
    PreferenceManager.getDefaultSharedPreferences(this).edit()
        .putBoolean("checkBox1", checked).commit();
    break;
}

Inside onCreate() add this:

CheckBox checkBox1 = (CheckBox) findViewById(R.id.checkBox1);
boolean checked = PreferenceManager.getDefaultSharedPreferences(this)
    .getBoolean("checkBox1", false);
checkBox1.setChecked(checked);

Done.

Answer 2

You can save the value in a preference and bind the value when it loads. for example,

boolean checkedFlag = Preference.getBoolean("checkboxstate",false);
    CheckBox cb = (CheckBox) findViewById(R.id.checkBox1);
    cb.setChecked(checkedFlag);

For setting values in preference

SharedPreferences Preference = getSharedPreferences("pref", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = Preference.edit();
editor.putBoolean("checkboxstate", checkboxstate);
editor.commit();

retrive value like

SharedPreferences Preference = getSharedPreferences("pref", Activity.MODE_PRIVATE);
 boolean isCheckboxSet = Preference.getBoolean("checkboxstate");

Answer 3

Yes, you can Just save the value of checkBox state in SharedPreferences and then retrieve them later when required

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString("state", "checked");
editor.commit();

later you can get it like

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
 String str = sp.getString("state");

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.See How to use SharedPreferences in Android to store, fetch and edit values

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You can use putBoolean() and getBoolean() methods of Sharedpreferences too as checkboxes have only two states