Почему мое приложение для Android разбилось?

Question

Пока я отлаживаю свое приложение, он падает. Я получаю сообщение «к сожалению, XXX остановил ошибку». Приложение, просматривающее файлы с SD.

Это сообщение Logcat:

01-15 22:08:49.878 20190-20190/com.example.ReadFile I/System.out﹕ debugger has settled (1378) 
01-15 22:08:49.962 20190-20209/com.example.ReadFile D/OpenGLRenderer﹕ Render dirty regions requested: true 
01-15 22:08:49.966 20190-20190/com.example.ReadFile D/Atlas﹕ Validating map... 
01-15 22:08:50.046 20190-20209/com.example.ReadFile I/OpenGLRenderer﹕ Initialized EGL, version 1.4 
01-15 22:08:50.068 20190-20209/com.example.ReadFile D/OpenGLRenderer﹕ Enabling debug mode 0 
01-15 22:08:50.070 20190-20209/com.example.ReadFile D/mali_winsys﹕ new_window_surface returns 0x3000 
01-15 22:08:58.528 20190-20190/com.example.ReadFile I/Choreographer﹕ Skipped 129 frames! The application may be doing too much work on its main thread. 
01-15 22:09:11.207 20190-20198/com.example.ReadFile A/libc﹕ Fatal signal 11 (SIGSEGV), code 1, fault addr 0xdead1234 in tid 20198 (JDWP) 

Вот код:

Это активность:

public class MyActivity extends Activity { 

    private UdpClient mUdpClient; 
    private TextView txtTest; 
    private Button btnDisconnect; 
    private Button btnConnect; 

    /** 
    * Called when the activity is first created. 
    */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     txtTest = (TextView)findViewById(R.id.txtTest); 
     btnConnect = (Button)findViewById(R.id.btnConnect); 

     btnConnect.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       ConnectToServer(); 
      } 
     }); 
    } 

    private void ConnectToServer() { 
     new ConnectTask().execute(""); 
    } 
    public class ConnectTask extends AsyncTask<String, Bitmap, UdpClient> { 
     @Override 
     protected UdpClient doInBackground(String... message) { 

      mUdpClient = new UdpClient(getApplicationContext()); 
      mUdpClient.run(); 
      return null; 
     } 

     @Override 
     protected void onProgressUpdate(Bitmap... bitmap){ 
      super.onProgressUpdate(bitmap); 
     } 
    } 
} 

Это код, который прочитал файлы:

public class UdpClient { 
    public static Context ctx; 


    public UdpClient(Context context) { 
     ctx = context; 
    } 

    public void run() 
    { 
     int valueIndex = R.raw.image_nearest; 
     int imageXYs = R.raw.image_xy; 

     String[] strNearestValue = this.ReadValueFile(valueIndex); 
     String[] imageXY = ReadValueFile(imageXYs); 

     int []nearestValue = new int[strNearestValue.length]; 

     int numOfPixel = imageXY.length; 
     int []pixels = new int[numOfPixel]; 

     for(int i=0;i<imageXY.length;i++) 
     { 
      nearestValue[i] = Integer.parseInt(strNearestValue[i]); 
      pixels[i]=GetXY(imageXY[i]); 
     } 
    } 

    public static int GetXY(String xyRaw) { 
     String[] xy = xyRaw.split(","); 
     short xPixel = Short.parseShort(xy[0]); 
     short yPixel = Short.parseShort(xy[1]); 
     int pixelIndex = 800 * (yPixel - 1) + xPixel - 1; 
     return pixelIndex; 
    } 


    private String[] ReadValueFile(int fileResourceID) { 
     List<String> list = new ArrayList<String>(); 
     try(InputStream inputStream = ctx.getResources().openRawResource(fileResourceID);){ 
      try(BufferedReader br= new BufferedReader(new InputStreamReader(inputStream))) 
      { 
       String line; 
       while ((line = br.readLine()) != null) { 
        list.add(line); 
       } 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return list.toArray(new String[list.size()]); 
    } 
} 

Это stacktrace:

01-15 22:02:00.884 19747-19847/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1 
    Process: com.example.ReadFile, PID: 19747 
    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:818) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ReadFile.UdpClient.run()' on a null object reference 
      at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:55) 
      at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:51) 
      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:818) 
01-15 22:02:37.108 19870-19901/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1 
    Process: com.example.ReadFile, PID: 19870 
    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:818) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ReadFile.UdpClient.run()' on a null object reference 
      at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:55) 
      at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:51) 
      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:818) 
01-15 22:08:16.826  399-442/? E/InputDispatcher﹕ channel '2f43cf57 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 
01-15 22:35:42.096  399-442/? E/InputDispatcher﹕ channel '23d7860 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 
01-15 22:58:22.366  399-442/? E/InputDispatcher﹕ channel '14d3e113 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 
01-15 23:02:44.483 21264-21272/com.example.ReadFile A/libc﹕ Fatal signal 11 (SIGSEGV), code 1, fault addr 0xdead1234 in tid 21272 (JDWP) 
01-15 23:02:45.046  399-442/? E/InputDispatcher﹕ channel '16edc311 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed! 

Ошибка программы после того, как я прочитал файлы.

Answer 1

Похоже, что основной процессор перегружен работой, другими словами, он очень ресурсоемкий. Например, когда файл перестает отвечать на запросы и падает в окнах, это в основном то же самое, попробуйте оптимизировать его или распространить из нити.

Answer 2

В журнале указано, что mUdpClient имеет значение NULL. Попробуйте инициализировать mUdpClient перед вызовом AsyncTask:

mUdpClient = новый UdpClient (getApplicationContext());

Также попробуйте сделать публикацию mUdpClient общедоступной.