必须在添加内容之前调用 ActionBarActivity requestFeature

Question

编辑反映matias's cmets

实际上，最初我的代码中没有supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); 或requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);，直到我注意到runtime exception when below combinations of actions happened

用户按下 Home 按钮以最小化应用程序并尝试从 Recent Apps 恢复它（长按 Home 按钮）

当屏幕旋转发生时（注意：清单没有 configChange声明）

然后我认为在初始化过程中显示不确定的进度条应该是导致问题的原因，所以只有我尝试调用 request* 方法，认为它会清除它，但什么也没发生..

最后，为了测试，我删除了showPdIndeterminate();。因此，在我的代码中没有任何地方显示它。在上述情况下仍然会发生同样的情况

---

我有一个基于ActionBarActivity 的片段，我的布局包含在DrawerLayout 和two framelayouts 中以容纳两个片段。

我尝试了requestFeature() must be called before adding content error on super.onCreate，但仍然是同样的例外

@Override
protected void onCreate(Bundle savedInstanceState) {
    Log.e(TAG, "Inside OnCreate");
    // supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    showPdIndeterminate();
           ....
}

而showPdIndeterminate() 是

private void showPdIndeterminate() {
    pd = ProgressDialog.show(this, "Initializing", "Pls wait...");
    pd.setIndeterminate(true);
    pd.show();
}

如果我尝试supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);，我会收到NullPointerException，所以只发表了评论。

错误日志是：

06-16 04:04:57.280: D/AndroidRuntime(27280): Shutting down VM
06-16 04:04:57.280: W/dalvikvm(27280): threadid=1: thread exiting with uncaught exception (group=0x413592a0)
06-16 04:04:57.285: E/AndroidRuntime(27280): FATAL EXCEPTION: main
06-16 04:04:57.285: E/AndroidRuntime(27280): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.demo/com.example.demo.MainActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3553)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.os.Looper.loop(Looper.java:137)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.main(ActivityThread.java:4898)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at java.lang.reflect.Method.invokeNative(Native Method)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at java.lang.reflect.Method.invoke(Method.java:511)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at dalvik.system.NativeStart.main(Native Method)
06-16 04:04:57.285: E/AndroidRuntime(27280): Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
06-16 04:04:57.285: E/AndroidRuntime(27280):    at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:267)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.Activity.requestWindowFeature(Activity.java:3320)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:63)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at com.example.demo.MainActivity.onCreate(MainActivity.java:464)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.Activity.performCreate(Activity.java:5206)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
06-16 04:04:57.285: E/AndroidRuntime(27280):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
06-16 04:04:57.285: E/AndroidRuntime(27280):    ... 12 more

注意：我在方向更改以及通过按主页按钮从最近的应用程序列表启动它时收到此异常

无论片段的onActivityCreated() oronCreate() 中是否有（没有）setRetainInstance(true);，此异常**最终**都会产生

为什么会这样？如何解决？

Answer 1

在您的 Activity 中覆盖 setContentView 并查看调用该方法的位置/内容。一旦你找到了它的名字，我相信我们可以找到一个可行的解决方案。

@Override
public void setContentView (int layoutResID)
{
  //Set a break point on the next line or log out a message. 
  super.setContentView(layoutResID);
}

Answer 2

尝试在setcontentView() 之前但在onCreate() 之后调用requestWindowFeature()。

为我工作。

Answer 3

android.support.v7.app.ActionBarActivity 通过添加ActionBar 来更改窗口的内容。此外，FEATURE_INDETERMINATE_PROGRESS 取决于是否存在操作栏。

试试这样的：

@Override
protected void onCreate(Bundle savedInstanceState) {
   ABD = ActionBarActivityDelegate.createDelegate(this);
   super.onCreate(savedInstanceState);
   ABD.onCreate(savedInstanceState);
}

ActionBarActivityDelegate 类可以在here 中找到。

最后，如果可能，您应该考虑锁定屏幕方向。这个有详细描述here。