Question

I have been looking at some posts and still I cannot get mine code to work (I am a beginner) .. I am just tring to use the toast with my two buttons with a case switch .. When compiling it just crashes .. one something has an idea ?

Code :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_menu);

    TextView et = (TextView) findViewById(R.id.txtHeader);

    Button btnAdd = (Button) findViewById(R.id.btnAdd);
    Button btnDis = (Button) findViewById(R.id.btnDisplay);

    btnAdd.setOnClickListener((OnClickListener) this);
    btnDis.setOnClickListener((OnClickListener) this);

}


public void OnClick(View v) {

        switch (v.getId()) {
          case R.id.btnAdd:
        //  Toast msg = Toast.makeText(getBaseContext(), "Torben", Toast.LENGTH_LONG);
        //   msg.show();
            break;

          case R.id.btnDisplay:
        //    Toast msg1 = Toast.makeText(getBaseContext(), "Henriksen", Toast.LENGTH_LONG);
        //       msg1.show();
            break;

           default:

              break;
        }
      }

Answer 1

I see two main problems:

((OnClickListener) this

Make sure your class implements OnClickListener because you never need to cast if you are actually implementing the interface.’

The declaration of the class should be something like:

public class MyActivity extends Activity implements OnClickListener

Then change OnClick to lowercase o.

@Override
public void onClick(View v) {