安卓监听返回键无反应

Question

重写了onKeyDown(int keyCode, KeyEvent event) 但是按返回键没反应，去掉onKeyDown(int keyCode, KeyEvent event) 方法就有效了
public boolean onKeyDown(int keyCode, KeyEvent event)

{

if (keyCode == KeyEvent.KEYCODE_BACK )

{

//为什么重写了此方法返回键就无效了呢
return true;
}

        return super.onKeyDown(keyCode, event);

    }  

Answer 1

public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK ) {
// XX 是要从哪返回的view
XX.wv.goBack();
}