Switch (button) Throws Nullpointerexception

I know this question already exists, but I tried serveral solutions and none worked for me. In my case, I need a Switch Button in the ActionBar. I tried to manually add a minSdk V

Solution 1:

Follow the answer by 'ρяσѕρєя K' but change his following line of code:

MenuItemitem= menu.findItem(R.id.switch_button);

to this:

MenuItem item = menu.findItem(R.id.myswitch); //the id was changed!

That should get rid of the NullPointerException, hope this helps :)

So you should have something like this:

@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_minepedia_main);
} 

@OverridepublicbooleanonCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main_actions, menu);

    MenuItem item = menu.findItem(R.id.myswitch);
    switchButton = (Switch)item.getActionView();

    switchButton.setOnCheckedChangeListener(newCompoundButton.OnCheckedChangeListener({

    @OverridepublicvoidonCheckedChanged(CompoundButton buttonView, boolean isChecked) {

    //The following is a local boolean variable if (isChecked) {
                ONLINE_MODE_ENABLED = true; 
            } else { 
                ONLINE_MODE_ENABLED = false; 
            } 

        } 
    }); 

    returnsuper.onCreateOptionsMenu(menu);
}

Additionally change this line:

android:actionLayout="@layout/switch_layout"

to this:

android:actionViewClass="android.widget.Switch"

That is within your menu xml. If you apply that change then you are using the switch button provided by android and that must work.

Solution 2:

Because Switch button is inside main_actions.xml so you should use menu.findItem in onCreateOptionsMenu to access views from Menu as:

@OverridepublicbooleanonCreateOptionsMenu(Menu menu) { 
    MenuInflaterinflater= getMenuInflater();
    inflater.inflate(R.menu.main_actions, menu);

    MenuItemitem= menu.findItem(R.id.switch_button);
    switchButton = (Switch)item.getActionView();

    returnsuper.onCreateOptionsMenu(menu);
}