android - 带有操作栏的 requestFeature

Question

所以我在看谷歌的操作栏 API 演示，他们有这个

// The Action Bar is a window feature. The feature must be requested
    // before setting a content view. Normally this is set automatically
    // by your Activity's theme in your manifest. The provided system
    // theme Theme.WithActionBar enables this for you. Use it as you would
    // use Theme.NoTitleBar. You can add an Action Bar to your own themes
    // by adding the element <item name="android:windowActionBar">true</item>
    // to your style definition.
    getWindow().requestFeature(Window.FEATURE_ACTION_BAR);

但是当我尝试添加最后一行代码时 getWindow().requestFeature(Window.FEATURE_ACTION_BAR); 我的应用程序在启动时就死机了。那么它到底有什么作用呢？

Answer 1

secret 是调用的顺序。请求功能必须在什么都不填充之前调用。我按照这个顺序做并且工作正常:

getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.your_activity_layout);