Question

我想隐藏标题栏，无论是背景还是前景。我刚刚试过这段代码但是有错误。有人说我的代码出了什么问题吗？

这是错误：

FATAL EXCEPTION: AsyncTask #1
    Process: com.example.amadey.myapplication3, PID: 21769
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
            at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:249)
            at android.app.Activity.requestWindowFeature(Activity.java:3298)
            at com.example.amadey.myapplication3.Activity$AsyncCaller.doInBackground(Activity.java:31)
            at com.example.amadey.myapplication3.Activity$AsyncCaller.doInBackground(Activity.java:28)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

我的代码：

public class Activity extends Activity {
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        new AsyncCaller().execute();

   }


    private class AsyncCaller extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... params) {
            Activity.this.requestWindowFeature(Window.FEATURE_NO_TITLE);
            return null;
        }
    }
}

Answer 1

调用setContentView后无法调用requestWindowFeature。它必须在之前调用。它根本不应该从AsyncTask中调用。

Answer 2

除主 UI线程外，您无法在任何线程中执行UI操作。

Activity.this.requestWindowFeature(Window.FEATURE_NO_TITLE);此行必须位于onCreate()类的Activity方法中。

此外，您最好更改活动的名称。

隐藏前景和背景中的标题栏

2 个答案: