CODEWITHSUNDEEP
javaandroidandroid-asynctask
Marcel Marino
Marcel Marino

Reputation: 1002

Android - ASyncTask Error ThreadPoolExecutor

I'm trying to download files in the background. I didn't change anything having to do with the file downloading or the asynctask, and all of a sudden it no longer worked. Here's my LogCat:

    03-04 17:51:45.485: W/System.err(1481): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
    03-04 17:51:45.485: W/System.err(1481):     at libcore.io.Posix.open(Native Method)
     03-04 17:51:45.485: W/System.err(1481):    at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
     03-04 17:51:45.485: W/System.err(1481):    at libcore.io.IoBridge.open(IoBridge.java:393)
     03-04 17:51:45.485: W/System.err(1481):    ... 14 more
     03-04 17:51:45.765: W/dalvikvm(1481): threadid=11: thread exiting with uncaught exception (group=0xb4af3b90)
     03-04 17:51:45.865: E/AndroidRuntime(1481): FATAL EXCEPTION: AsyncTask #1
     03-04 17:51:45.865: E/AndroidRuntime(1481): Process: com.csc.android.industryforum, PID: 1481
     03-04 17:51:45.865: E/AndroidRuntime(1481): java.lang.RuntimeException: An error occured while executing doInBackground()
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at android.os.AsyncTask$3.done(AsyncTask.java:300)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.lang.Thread.run(Thread.java:841)
     03-04 17:51:45.865: E/AndroidRuntime(1481): Caused by: java.lang.NullPointerException: lock == null
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.io.Reader.<init>(Reader.java:64)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.io.InputStreamReader.<init>(InputStreamReader.java:122)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.io.InputStreamReader.<init>(InputStreamReader.java:59)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at com.csc.android.industryforum.MainActivity.readFileArray(MainActivity.java:902)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at com.csc.android.industryforum.MainActivity.handleMenuInfo(MainActivity.java:355)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at com.csc.android.industryforum.MainActivity.access$1(MainActivity.java:342)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at com.csc.android.industryforum.MainActivity$DownloadTask.doInBackground(MainActivity.java:1023)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at com.csc.android.industryforum.MainActivity$DownloadTask.doInBackground(MainActivity.java:1)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
     03-04 17:51:45.865: E/AndroidRuntime(1481):    ... 4 more
     03-04 17:51:46.485: I/Choreographer(1481): Skipped 72 frames!  The application may be doing too much work on its main thread.
     03-04 17:51:46.925: I/Choreographer(1481): Skipped 65 frames!  The application may be doing too much work on its main thread.
     03-04 17:51:48.615: E/WindowManager(1481): android.view.WindowLeaked: Activity com.csc.android.industryforum.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b4dcd940 V.E..... R.....ID 0,0-424,140} that was originally added here
     03-04 17:51:48.615: E/WindowManager(1481):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.Dialog.show(Dialog.java:286)
     03-04 17:51:48.615: E/WindowManager(1481):     at com.csc.android.industryforum.MainActivity.loadFiles(MainActivity.java:136)
     03-04 17:51:48.615: E/WindowManager(1481):     at com.csc.android.industryforum.MainActivity.onCreate(MainActivity.java:99)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.Activity.performCreate(Activity.java:5243)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.ActivityThread.access$700(ActivityThread.java:135)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.os.Handler.dispatchMessage(Handler.java:102)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.os.Looper.loop(Looper.java:137)
     03-04 17:51:48.615: E/WindowManager(1481):     at android.app.ActivityThread.main(ActivityThread.java:4998)
     03-04 17:51:48.615: E/WindowManager(1481):     at java.lang.reflect.Method.invokeNative(Native Method)
     03-04 17:51:48.615: E/WindowManager(1481):     at java.lang.reflect.Method.invoke(Method.java:515)
     03-04 17:51:48.615: E/WindowManager(1481):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
     03-04 17:51:48.615: E/WindowManager(1481):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
     03-04 17:51:48.615: E/WindowManager(1481):     at dalvik.system.NativeStart.main(Native Method)

According to one of the answers, the problem is with my file reading, so here's the code:

private ArrayList<String> readFileArray(File file){
    FileInputStream in = null;
    try {
        in = openFileInput(file.getName());
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    InputStreamReader inputStreamReader = new InputStreamReader(in);//this is line 902
    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
    StringBuilder sb = new StringBuilder(); 
    String line;
    String line1 = "";
    ArrayList<String> ar1 = new ArrayList<String>(); 
    try {
        while ((line = bufferedReader.readLine()) != null) {
            sb.append(line);
            ar1.add(line);
            if (line1.equals("")){
                line1 = line1 + line;
            }else{
            line1 = line1 + "\n" + line;
            }
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return ar1;

}

And here's the code that calls that code:

    private String[] handleMenuInfo(String selection){
    DataClass dc = new DataClass(this);

    File dir = getDir("myDir", Context.MODE_PRIVATE);
    File file = new File(dir, selection + ".txt");
    ArrayList <String> menuArray;

        menuArray = readFileArray(file);
        String[] menuList = menuArray.toArray(new String[menuArray.size()]);
        return menuList;
    //}

}

Here's the ASyncTask

 private class DownloadTask extends AsyncTask<Integer, Void, Void> {

    private Context context;
    private PowerManager.WakeLock mWakeLock;

    public DownloadTask(Context context) {
        this.context = context;
    }

    @Override
    protected void onPreExecute() {

    }

     protected void onPostExecute() {

    }

    @Override
    protected Void doInBackground(Integer... sUrl) {

            DataClass dc = new DataClass(c);
            //ArrayList<String> menuArray = dc.getMenuArray("Home");
            String[] menuArray = {"Home", "Announcements", "Speakers", "Events", "Exhibitors", "Agenda", "Hotels", "Documents"}; 
            File dir = getDir("myDir", Context.MODE_PRIVATE);

            for(int i=1; i <= 7; i++){
                String[] menuList = handleMenuInfo(menuArray[i]);
                mProgressDialog.setIndeterminate(false);
                mProgressDialog.setMax(7);
                mProgressDialog.setProgress(i);
                for(int i2=1; i2 < menuList.length; i2++){
                File file = new File(dir, menuArray[i]  + "/" + menuList[i2] + ".txt");
                ArrayList<String> viewArray = dc.getInfoArray(menuArray[i],menuList[i2]);
                writeToFile(file, viewArray);

                }
            }
            SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(c);
            Editor editor = sharedPreferences.edit();
            editor.putString("new", "No");
            editor.commit();
            mProgressDialog.dismiss();
       return null;


        }
    }


}

Upvotes: 0

Views: 4940

Answers (1)

Paul Lammertsma
Paul Lammertsma

Reputation: 38252

Based purely off of the stack trace you've provided, it appears that you're encountering this problem. In MainActivity.DownloadTask, you're passing an uninitialized FileInputStream into the InputStreamReader.

The problem resides around the instantiation of your InputStream being used in MainActivity, line 902.

Upvotes: 1

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