Force close with SharedPreferences and toggle button in android

Question

i have a problem with my toggle button and i get always a force close. The code of button:

public void getToggle(View view) {
        boolean on = ((ToggleButton) view).isChecked();
        if (on) {
            PackageManager pm = getPackageManager();
            ComponentName compName = new ComponentName(getApplicationContext(),
            LowBatteryReceiver.class);
            pm.setComponentEnabledSetting(compName, PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);
            Toast.makeText(MainActivity.this, "Modalità risparmio attivata", Toast.LENGTH_LONG).show();
            TextView textView = (TextView)findViewById(R.id.risparmiostate);
            textView.setText("Modalità risparmio on");

            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("tgpref", true); // value to store
            editor.commit();

        }else{
            PackageManager pm = getPackageManager();
            ComponentName compName = new ComponentName(getApplicationContext(),
            LowBatteryReceiver.class);
            pm.setComponentEnabledSetting(compName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
            Toast.makeText(MainActivity.this, "Modalità risparmio disattivata", Toast.LENGTH_LONG).show();
            TextView textView = (TextView)findViewById(R.id.risparmiostate);
            textView.setText("Modalità risparmio off");

            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("tgpref", false); // value to store
            editor.commit();
        }
    }

and in the onCrerate

public SharedPreferences preferences;
    /** Called when the activity is first created. */
    @SuppressLint("NewApi")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
SharedPreferences preferences = getPreferences(MODE_PRIVATE);
        boolean tgpref = preferences.getBoolean("tgpref", true);  //default is true
        if (tgpref = true) //if (tgpref) may be enough, not sure
        {
          togglebutton.setChecked(true);
        }
        else
        {
            togglebutton.setChecked(false);
        }

Any ideas? I tryied everything. Thanks. My logcat doesn't work (i don't know why). Doesn't show me anything.

post the logcat error otherwise it is not easy to find out mean we can not find anything in dark night — Sunil Kumar, Jul 03 '13 at 05:29

score 1 · Accepted Answer · answered Jul 03 '13 at 05:31

1

Change

SharedPreferences preferences = getPreferences(MODE_PRIVATE);

to

 preferences = getPreferences(MODE_PRIVATE);

in onCreate of Activity because you are not initializing preferences instance which u have declared as class level field before using it in getToggle method

answered Jul 03 '13 at 05:31

ρяσѕρєя K

132,198
53
198
213

Doesn't work..Ok i have the logcat..I have a fatal error "Unable to start activity" and then "Caused by NullPointerException....MainActivity onCreate(57)" – David_D Jul 03 '13 at 06:02
Ok now it works, the problem was that i declared the togglebutton after the check condition. The only one problem now is that the toggle start in "on" state instead "off". Why? – David_D Jul 03 '13 at 06:07
man please HELP !! http://stackoverflow.com/questions/17421506/how-to-parse-same-name-tag-in-android-xml-dom-parsing – Altair Jul 03 '13 at 14:22
@ρяσѕρєяK : hmm...did you find any solution to this : http://stackoverflow.com/questions/17421506/how-to-parse-same-name-tag-in-android-xml-dom-parsing – Altair Jul 03 '13 at 14:42

score 1 · Answer 2 · answered Jul 03 '13 at 05:33

1

Try to use

if (tgpref == true)

Or

if(tgpref)

instead Of

if (tgpref = true).

Try to initialize your TextView textView = (TextView)findViewById(R.id.risparmiostate); in Oncreate().

Also remove SharedPreferences from SharedPreferences preferences = getPreferences(MODE_PRIVATE);As u already declared globally.

answered Jul 03 '13 at 05:33

Bhoomika Brahmbhatt

7,404
3
29
44

None of this solutions works :(. Is that possible that the problem is the way i set the toggle? – David_D Jul 03 '13 at 05:58
Put your updated code with xml.If u get logact error then also post it. – Bhoomika Brahmbhatt Jul 03 '13 at 08:09
I resolved. the problem was that i declared the togglebutton after the check condition.But now the toggle when i start for the first time the application, is set in "on" state and not "off". How can i set as default state? – David_D Jul 03 '13 at 08:37
1

change boolean tgpref = preferences.getBoolean("tgpref", true); to boolean tgpref = preferences.getBoolean("tgpref", false);. – Bhoomika Brahmbhatt Jul 03 '13 at 11:33

Force close with SharedPreferences and toggle button in android

2 Answers2