如何解决未知实体按钮错误？

Question

public class MainActivity extends Activity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

    Button btn=(Button) findViewById(R.id.mainBtn1);
    btn.setOnClickListener(new OnClickListener(){

    @Override
    public void onClick(View v)
    {
        MyActivity.setContentView(R.layout.sib-aval);
    }

    });
}
}

Answer 1

MyActivity必须是MainActivity，请检查删除：

MyActivity.setContentView(R.layout.sib-aval);

为此：

setContentView(R.layout.sib-aval);