Question

所以我正在看谷歌的动作栏的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已经死了。那真的是什么呢？

Answer 1

秘密是呼叫的顺序。必须在填写任何内容之前调用请求功能。我按此顺序执行并且工作正常：

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

Answer 2

我知道这已经很晚了，你试过吗

requestWindowFeature(Window.FEATURE_ACTION_BAR)

requestFeature带有操作栏

2 个答案: