I created a button which changes its Image onClick.
As I tried to add another Button which does exactly the same the app crashed.

I don´t know how to add a second or more Buttons which have an access to the onClick method.
I found similar questions to this but nothing solved the Problem.

Here´s the code with the example. It works for 1 button.

code: 

```
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends ActionBarActivity {
    Button b;

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b=(Button)findViewById(R.id.button3);
    b.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            b.setBackgroundResource(R.drawable.ic_launcher);

        }
    });
}
}

```