Toast Java

exemplo.java

public class BaseActvity extends Activity{
    public void toast(String message, int duration) {
        Toast.makeText(this, message, duration);
    }
}

public class MainActvity extends BaseActvity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toast("Hello, Java", Toast.LENGTH_SHORT);
    }
}