最近在学习第一行代码这本书,里面的关于activity生命周期有一段例子,但是我自己用mac上装的as运行一直出问题,看log的话就是android.util.AndroidRuntimeException: requestFeature() must be called before adding content这个错误,从网上找了半天,终于找到了解决办法,虽然没有太明白原理,但是在这里做个分享吧。

这个是修改之后的代码

 protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState);
setContentView(R.layout.dialog_layout);
}

本来requestWindowFeature这个方法是在第二句的,但是并没有跟报错的内容相符合,但是确实把这个语句放在最前面就可以运行了,有知道为什么的大神可以帮我解答一下,谢谢。

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