解决requestFeature() must be called before adding content问题

问题描述

在编译运行android开发网站的教程，activity的生命周期的教程中遇到如下问题:
点击Dialog按钮，应用会崩溃

解决方法

将activity_dialog中的如下代码

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

改为如下代码

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