錯誤加載靜態片段和FrameLayout裏（

Question

我試圖用靜態片段加載佈局，並使用該佈局在的LinearLayout：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:orientation="horizontal" android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:baselineAligned="false" 
    android:divider="?android:attr/dividerHorizontal" 
    tools:context="com.eldad.yossi.popularmovs.MainActivity"> 
    <fragment 
     android:id="@+id/main_fragment" 
     android:name="com.eldad.yossi.popularmovs.MainActivityFragment" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="2" 
     tools:layout="@android:layout/list_content" /> 
    <FrameLayout 
     android:id="@+id/movies_detail_container" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="4" /> 
</LinearLayout> 

但是，當應用程序啓動我得到這個錯誤：

當我使用只包含片段佈局加載它們

11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime: FATAL EXCEPTION: ModernAsyncTask #2 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime: Process: com.eldad.yossi.popularmovs, PID: 13809 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground() 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.ModernAsyncTask$3.done(ModernAsyncTask.java:142) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.lang.Thread.run(Thread.java:818) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1437) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.content.ContentResolver.query(ContentResolver.java:462) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.ContentResolverCompatJellybean.query(ContentResolverCompatJellybean.java:29) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.ContentResolverCompat$ContentResolverCompatImplJB.query(ContentResolverCompat.java:57) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.ContentResolverCompat.query(ContentResolverCompat.java:125) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:59) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:37) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:296) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:54) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:42) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:128) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)  
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)  
11-02 23:02:36.418 13809-13880/com.eldad.yossi.popularmovs E/AndroidRuntime:  at java.lang.Thread.run(Thread.java:818)  

相同的活動和片段工作。

什麼想法？

完整的代碼是在GitHub回購 - https://github.com/yossildad/PopularMovs 謝謝。

Answer 1

您的問題不在片段聲明中。根據堆棧跟蹤，查看您正在擴展的ModernASyncTask的doInBackground方法。 java.lang.RuntimeException：執行doInBackground（）時發生錯誤 - 我猜可能你可能對上下文對象有空引用。

Answer 2

從堆棧跟蹤我可以看到你試圖從活動com.eldad.yossi.popularmovs.MainActivity的doInBackground（）方法中的空引用中獲取一個URI。

Answer 3

好吧，我發現了這個錯誤。在創建片段內的Loader 時，我使用了未初始化的uri。 感謝您的幫助，併爲此感到抱歉。