Question

我在运行时收到堆栈跟踪错误。

Runtime Exception : An error occurred while executing doInBackground()
Fatal signal 6 (SIGABRT) at 0x0000162c (code=-6), thread 5676

我发布了完整的堆栈跟踪并指出了下面的错误行编码

加载片段页面时，我收到此日志错误。严重的应用程序崩溃。它已经在所有设备中发生。

堆栈跟踪：

01-30 05:05:57.213: E/dalvikvm(5676): VM aborting
01-30 05:05:57.213: A/libc(5676): Fatal signal 6 (SIGABRT) at 0x0000162c (code=-6), thread 5676 (e.quranmadeeasy)
01-30 05:05:57.761: D/dalvikvm(5767): GC_FOR_ALLOC freed 121K, 6% free 3345K/3524K, paused 2ms, total 2ms
01-30 05:05:57.761: I/dalvikvm-heap(5767): Grow heap (frag case) to 4.394MB for 1127532-byte allocation
01-30 05:05:57.761: D/dalvikvm(5767): GC_FOR_ALLOC freed <1K, 4% free 4446K/4628K, paused 2ms, total 2ms
01-30 05:05:57.805: W/dalvikvm(5767): threadid=12: thread exiting with uncaught exception (group=0xa4cc6b20)
01-30 05:05:57.805: W/dalvikvm(5767): threadid=15: thread exiting with uncaught exception (group=0xa4cc6b20)
01-30 05:05:57.805: I/Process(5767): Sending signal. PID: 5767 SIG: 9

01-30 05:05:57.805: E/AndroidRuntime(5767): FATAL EXCEPTION: AsyncTask #1
01-30 05:05:57.805: E/AndroidRuntime(5767): Process: com.qrme.quranmadeeasy, PID: 5767
01-30 05:05:57.805: E/AndroidRuntime(5767): java.lang.RuntimeException: An error occured while executing doInBackground()
01-30 05:05:57.805: E/AndroidRuntime(5767):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.lang.Thread.run(Thread.java:841)
01-30 05:05:57.805: E/AndroidRuntime(5767): Caused by: java.lang.NullPointerException
01-30 05:05:57.805: E/AndroidRuntime(5767):     at com.qrme.quranmadeeasy.LessonActivity$getLesson.doInBackground(LessonActivity.java:258)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at com.qrme.quranmadeeasy.LessonActivity$getLesson.doInBackground(LessonActivity.java:1)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
01-30 05:05:57.805: E/AndroidRuntime(5767):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
01-30 05:05:57.805: E/AndroidRuntime(5767):     ... 4 more

LessonActivity.java：

public class LessonActivity extends Activity implements OnItemClickListener {

    static ArrayList<Lesson> lessonList =null ;
    static ArrayList<Settings> settings = null;
    int chapterId;

   @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
        setContentView(R.layout.activity_lesson);

     if (getIntent() != null && getIntent().getExtras() != null) {
        String chapt_id = getIntent().getExtras().getString("CHAPTER_ID");
        chapter = getIntent().getExtras().getString("CHAPTER_NAME");
        // txtChapterdetails.setText(chapter);
        if (chapt_id != null && !chapt_id.equalsIgnoreCase("")) {
            chapterId = Integer.parseInt(chapt_id);
        }
    }
initialize();
        listLesson.setOnItemClickListener(this);
    }

   @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

   new getLesson().execute("");
  }

..............
..............

// Async Task for getting all lesson of a chapter

    public class getLesson extends AsyncTask<String, Void, String> {

        // ProgressDialog pd; // progress dialog declaration

        @Override
        protected String doInBackground(String... params) {

            lessonList = DatabaseQueryHelper.getInstance().getLesson(chapterId); -->258th line

            return null;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected void onPostExecute(String result) {

            if(lessonList!=null)
            {
                if(lessonList.size()>0)
                {
            al = new AdapterLesson(LessonActivity.this, lessonList); 
            listLesson.setAdapter(al); 

            }
            }
        }
    }
}

任何人都可以帮助我。谢谢。

Answer 1

DatabaseQueryHelper.getInstance().getLesson(chapterId);

此语句无法从数据库中查找数据，因此应检查您的代码......

以及为什么

@Override
        protected String doInBackground(String... params) {

            lessonList = DatabaseQueryHelper.getInstance().getLesson(chapterId); 
            return null;
        }

它返回null ...

Answer 2

根据stacktrace，我认为问题是DatabaseQueryHelper.getInstance（）返回null;

Answer 3

你的数据库查询没有返回任何结果，这就是为什么你得到空指针异常...使用if条件检查它...其次你返回null onPostExecute()方法.insted of返回null返回课程列表

lessonList = DatabaseQueryHelper.getInstance().getLesson(chapterId);

return lessonList;

然后在onPostExecute（）中检查是否为null，如

我不知道你的lessonList是一个数组还是什么，但你必须遵循以下方法

if(result!=null)
{
       if(result.size()>0)
       {
        your code  

       }

Answer 4

最后我找到了答案。

因more contents added in a single Table cell on local Database.

而发生致命异常错误

我在SQLite Manager Ad-Ons的帮助下看到了本地数据库。然后我才知道，在单个表格单元格中添加了更多内容。

这就是它抛出此错误的原因：

VM aborting
Fatal signal 6 (SIGABRT) at 0x0000162c (code=-6), thread 5676

然后我在特定的表格单元格中添加了较少的内容。我没有看到任何崩溃。按照我的预期获得输出。

运行时异常：执行doInBackground（）时发生错误

4 个答案: