I can't change background color another activity

Question

I have two activity. Cores and MudaCor. In Cores i have four buttons, selecting anything here tries to changes button color from MudaCor and start it, but the Android Emulator tell me "Error on App."

public class MudaCor extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_muda_cor); 
    } 
}

    btnVermelho.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            img1.setBackgroundColor(getResources().getColor(corVerde));
            img2.setBackgroundColor(getResources().getColor(corVerde));
            img3.setBackgroundColor(getResources().getColor(corVerde));
            img4.setBackgroundColor(getResources().getColor(corVerde));

            Intent intent = new Intent(Cores.this, MudaCor.class);
            startActivity(intent);
        }
    });

https://stackoverflow.com/help/how-to-ask - please include the stacktrace, and code for both Activities, at a minimum, with your question. — dominicoder, Sep 23 '17 at 22:36
btw, I would be interested to know who is `he` and `her` in your post. — zeekhuge, Sep 23 '17 at 22:37
public class MudaCor extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_muda_cor); } } — Goji Berry, Sep 23 '17 at 22:38
I need to know how to change the background of a button from another activity. — Goji Berry, Sep 23 '17 at 22:40
You aren't changing anything in the other activity because that Intent is empty — OneCricketeer, Sep 23 '17 at 22:44
Also, `img1` cannot be referenced across activities, so that's why your app is probably crashing — OneCricketeer, Sep 23 '17 at 22:50

I can't change background color another activity

0 Answers0