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POAndroid AsyncTask doInBackground operation stopping suddenly with unhandled exception
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  1. POAndroid AsyncTask doInBackground operation stopping suddenly with unhandled exception
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    copied!<p>I am having a strange problem.My <strong>asyncTask operation</strong> is getting terminated suddenly with an unhandled exception.<strong>about 45 % of the tasks is getting completed then the termination occurs.</strong></p> <p>here is my logcat</p> <pre><code>01-26 12:13:48.216: I/System.out(4421): success 01-26 12:13:48.386: I/System.out(4421): success 01-26 12:13:48.576: I/System.out(4421): success 01-26 12:13:48.616: D/dalvikvm(4421): GC_CONCURRENT freed 473K, 48% free 3256K/6215K, external 0K/0K, paused 3ms+4ms 01-26 12:13:48.806: I/System.out(4421): success 01-26 12:13:48.806: W/dalvikvm(4421): threadid=9: thread exiting with uncaught exception (group=0x40018560) 01-26 12:13:48.806: E/AndroidRuntime(4421): FATAL EXCEPTION: AsyncTask #1 01-26 12:13:48.806: E/AndroidRuntime(4421): java.lang.RuntimeException: An error occured while executing doInBackground() 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.os.AsyncTask$3.done(AsyncTask.java:200) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.lang.Thread.run(Thread.java:1019) 01-26 12:13:48.806: E/AndroidRuntime(4421): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.ArrayList.get(ArrayList.java:311) 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.Instance.temporalSampler(Instance.java:91) 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.Instance.createInstance(Instance.java:76) 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.GestureStore.addGesture(GestureStore.java:158) 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.gesture.GestureLibrary.addGesture(GestureLibrary.java:68) 01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity.saveGesture(TestActivity.java:467) 01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity$A.doInBackground(TestActivity.java:102) 01-26 12:13:48.806: E/AndroidRuntime(4421): at com.android.pack.TestActivity$A.doInBackground(TestActivity.java:1) 01-26 12:13:48.806: E/AndroidRuntime(4421): at android.os.AsyncTask$2.call(AsyncTask.java:185) 01-26 12:13:48.806: E/AndroidRuntime(4421): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 01-26 12:13:48.806: E/AndroidRuntime(4421): ... 4 more 01-26 12:13:49.356: E/WindowManager(4421): Activity com.android.pack.TestActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053a358 that was originally added here 01-26 12:13:49.356: E/WindowManager(4421): android.view.WindowLeaked: Activity com.android.pack.TestActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4053a358 that was originally added here 01-26 12:13:49.356: E/WindowManager(4421): at android.view.ViewRoot.&lt;init&gt;(ViewRoot.java:259) 01-26 12:13:49.356: E/WindowManager(4421): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 01-26 12:13:49.356: E/WindowManager(4421): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 01-26 12:13:49.356: E/WindowManager(4421): at android.view.Window$LocalWindowManager.addView(Window.java:465) 01-26 12:13:49.356: E/WindowManager(4421): at android.app.Dialog.show(Dialog.java:241) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.pack.TestActivity.addgestures(TestActivity.java:159) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.pack.TestActivity.onOptionsItemSelected(TestActivity.java:404) 01-26 12:13:49.356: E/WindowManager(4421): at android.app.Activity.onMenuItemSelected(Activity.java:2205) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:776) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122) 01-26 12:13:49.356: E/WindowManager(4421): at android.view.View$PerformClick.run(View.java:9107) 01-26 12:13:49.356: E/WindowManager(4421): at android.os.Handler.handleCallback(Handler.java:587) 01-26 12:13:49.356: E/WindowManager(4421): at android.os.Handler.dispatchMessage(Handler.java:92) 01-26 12:13:49.356: E/WindowManager(4421): at android.os.Looper.loop(Looper.java:130) 01-26 12:13:49.356: E/WindowManager(4421): at android.app.ActivityThread.main(ActivityThread.java:3835) 01-26 12:13:49.356: E/WindowManager(4421): at java.lang.reflect.Method.invokeNative(Native Method) 01-26 12:13:49.356: E/WindowManager(4421): at java.lang.reflect.Method.invoke(Method.java:507) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847) 01-26 12:13:49.356: E/WindowManager(4421): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 01-26 12:13:49.356: E/WindowManager(4421): at dalvik.system.NativeStart.main(Native Method) 01-26 12:14:04.836: I/Process(4421): Sending signal. PID: 4421 SIG: 9 </code></pre> <p><strong>and here is the AsyncTask class</strong></p> <pre><code>class A extends AsyncTask&lt;File[],Integer,Void&gt; { private Context cnt; int count=0; @Override protected void onPreExecute() { } A(Context context) { cnt=context; } protected Void doInBackground(File[]... params) { // TODO Auto-generated method stub File[] newfiles=params[0]; File[] temp=null; int progress=0; float dircnt=0; int numberofdir=newfiles.length; for(File b:newfiles) { count=0; dirname=b.getName(); if(b.isDirectory()) { temp=b.listFiles(); } for(File a:temp) { gest=dotask.batchprocess(a.getPath()); if(gest!=null) System.out.println("success"); String name=dirname+"_"+count; saveGesture(name, gest); count++; } dircnt=dircnt+1; progress=(int)((dircnt/numberofdir)*100); try { Thread.sleep(60); publishProgress(progress); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return null; } @Override protected void onProgressUpdate(Integer... values) { // increment progress bar by progress value pd.setProgress(values[0]); pd.setMessage("completed "+dirname); } protected void onPostExecute() { pd.hide(); pd=null; } </code></pre> <p>}</p> <p>and here is the method that calls the Asynctask object and executes it</p> <pre><code>public void addgestures() { cView.postInvalidate(); dotask.setH(cView.getH()); dotask.setW(cView.getW()); count=0; files=null; /*if(dir.isDirectory()) { files=dir.listFiles(); }*/ files=dir.listFiles(); for(int i=0;i&lt;files.length;i++) { System.out.println(files[i].getPath()); } pd = new ProgressDialog(this); pd.setMessage("Matching progress"); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pd.setMax(100); pd.setCancelable(false); pd.setProgress(0); pd.show(); A a=new A(this); a.execute(files); } </code></pre> <p>There is no error in the rest of the program as about 40% of the task is being done successfully..So I din't upload the rest of the program.</p> <pre><code>**here is the TESTACTIVITY CLASS** package com.android.pack; import java.io.File; import java.net.URISyntaxException; import android.app.Activity; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.gesture.GestureLibrary; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.text.Editable; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.Toast; public class TestActivity extends Activity { /** Called when the activity is first created. */ int height; int weight; private ProgressDialog pd=null; customview cView; String path=""; String pathchk=""; String temp=""; String name=null; float pathSmooth[]; private File mStoreFile; Gesture gest; File dir; String dirname; File[] files; int count; int Height; int Weight; task dotask; Context ct; private static GestureLibrary sStore=null; private static final int FILE_SELECT_CODE = 0; public void perform() // { cView.set_file(pathchk); cView.postInvalidate(); } class A extends AsyncTask&lt;File[],Integer,Void&gt; { private Context cnt; int count=0; @Override protected void onPreExecute() { } A(Context context) { cnt=context; } protected Void doInBackground(File[]... params) { // TODO Auto-generated method stub File[] newfiles=params[0]; File[] temp=null; int progress=0; float dircnt=0; int numberofdir=newfiles.length; for(File b:newfiles) { count=0; dirname=b.getName(); if(b.isDirectory()) { temp=b.listFiles(); } for(File a:temp) { gest=dotask.batchprocess(a.getPath()); if(gest!=null) System.out.println("success"); String name=dirname+"_"+count; saveGesture(name, gest); count++; } dircnt=dircnt+1; progress=(int)((dircnt/numberofdir)*100); try { Thread.sleep(60); publishProgress(progress); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return null; } @Override protected void onProgressUpdate(Integer... values) { // increment progress bar by progress value pd.setProgress(values[0]); pd.setMessage("completed "+dirname); } protected void onPostExecute() { pd.hide(); pd=null; } } public void addgestures() { cView.postInvalidate(); dotask.setH(cView.getH()); dotask.setW(cView.getW()); count=0; files=null; /*if(dir.isDirectory()) { files=dir.listFiles(); }*/ files=dir.listFiles(); for(int i=0;i&lt;files.length;i++) { System.out.println(files[i].getPath()); } pd = new ProgressDialog(this); pd.setMessage("Matching progress"); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); pd.setMax(100); pd.setCancelable(false); pd.setProgress(0); pd.show(); A a=new A(this); a.execute(files); } public void showFileChooser() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); // File file = new File("/sdcard"); intent.setType("file://*"); intent.addCategory(Intent.CATEGORY_OPENABLE); try { startActivityForResult( Intent.createChooser(intent, "Select a File to Upload"), FILE_SELECT_CODE); } catch (android.content.ActivityNotFoundException ex) { // Potentially direct the user to the Market with a Dialog Toast.makeText(this, "Please install a File Manager.", Toast.LENGTH_SHORT).show(); } } public void smoothPoint() { float pathScale[]=cView.getPathSmooth(); int pi; // Index over all the points in the trace int ti; // Index over all the traces of a tracegroup float Xavg,Yavg; //int numTraces=getNumTraces(); int numTraces=1; int stopCount=0; int numPoints =(pathScale.length)/2; float xsd,ysd; int count1=1,count2=1; float m2=0,m1=0; float sumX=0, sumY=0; //partial sum float Xchannel []=new float[numPoints*2]; float Xdist=0,Ydist=0; float Ychannel []=new float[numPoints*2]; float nXchannel[]= new float[numPoints*2*2]; float nYchannel[]=new float[numPoints*2*2]; int finalCount=1; float n1Xchannel[]= new float[numPoints*4*2]; float n1Ychannel[]=new float[numPoints*4*2]; float xfinal[] = new float[numPoints*4*2]; float yfinal[]= new float[numPoints*4*2]; int valid[]=new int[numPoints]; Log.v("number of points",numPoints+""); for(int i=0;i&lt;numPoints;i++) { //valid[i]=1; Xchannel[i]=pathScale[i*2]; Ychannel[i]=pathScale[i*2+1]; } for(ti=0;ti&lt;numTraces;ti++) { sumX=sumY=0; for(pi=0;pi&lt;numPoints-1;pi++) { sumX+=Math.abs((Math.abs(Xchannel[pi+1])-Math.abs(Xchannel[pi]))); sumY+=Math.abs((Math.abs(Ychannel[pi+1])-Math.abs(Ychannel[pi]))); } } for(pi=1;pi&lt;numPoints-1;pi++) { m1=(Ychannel[pi]-Ychannel[pi-1])/(Xchannel[pi]-Xchannel[pi-1]); m2=(Ychannel[pi+1]-Ychannel[pi])/(Xchannel[pi+1]-Xchannel[pi]); if(m1*m2&lt;0) { valid[pi]=0; stopCount++; } } nXchannel[0]=Xchannel[0]; nYchannel[0]=Ychannel[0]; for(pi=1;pi&lt;numPoints;pi++) { nXchannel[pi*2-1]=(Xchannel[pi]+Xchannel[pi-1])/2; nYchannel[pi*2-1]=(Ychannel[pi]+Ychannel[pi-1])/2; //System.out.print(" \n mid x and y "+nXchannel[pi*2-1]+nYchannel[pi*2-1]); nXchannel[pi*2]=Xchannel[pi]; nYchannel[pi*2]=Ychannel[pi]; count1+=2; } //System.out.println("new array... "); n1Xchannel[0]=nXchannel[0]; n1Ychannel[0]=nYchannel[0]; for(pi=1;pi&lt;count1;pi++) { n1Xchannel[pi*2-1]=(nXchannel[pi]+nXchannel[pi-1])/2; n1Ychannel[pi*2-1]=(nYchannel[pi]+nYchannel[pi-1])/2; //System.out.print(" \n mid x and y "+n1Xchannel[pi*2-1]+n1Ychannel[pi*2-1]); n1Xchannel[pi*2]=nXchannel[pi]; count2+=2; n1Ychannel[pi*2]=nYchannel[pi]; } Log.v("Count1",count1+""); Log.v("Count2",count2+""); xfinal[0]=n1Xchannel[0]; yfinal[0]=n1Ychannel[0]; Xavg=sumX/(numPoints -1); Log.v("finalCount",finalCount+""); Log.v("Xavg",sumX+""); Yavg=sumY/(numPoints-1) ; for(pi=1;pi&lt;count2-1;pi++) { Xdist=Math.abs((Math.abs(n1Xchannel[pi])-Math.abs(xfinal[finalCount-1]))); Ydist=Math.abs((Math.abs(n1Ychannel[pi])-Math.abs(yfinal[finalCount-1]))); if(Xdist&gt;=Xavg||Ydist&gt;=Yavg) { xfinal[finalCount]=n1Xchannel[pi]; yfinal[finalCount++]=n1Ychannel[pi]; } } pathSmooth=new float[finalCount*2]; for(pi=0;pi&lt;finalCount;pi++) { pathSmooth[pi*2] = xfinal[pi]; pathSmooth[pi*2+1] = yfinal[pi]; //pnts.get(pi).x=(int) nXchannel[pi]; //pnts.get(pi).y=(int) nYchannel[pi]; ////System.out.println("x "+(int)nXchannel[pi]+ " and y "+(int)nYchannel[pi]); } cView.setPathSmooth(pathSmooth); } protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case FILE_SELECT_CODE: if (resultCode == RESULT_OK) { // Get the Uri of the selected file Uri uri = data.getData(); Log.v("check", "File Uri: " + uri.toString()); // Get the path try { path = FileUtils.getPath(this, uri); pathchk=path.substring(12); perform(); } catch (URISyntaxException e) { // TODO Auto-generated catch block Log.v("error", "File Path: "+pathchk); } Log.v("check", "File Path: "+path); // Get the file instance // File file = new File(path); // Initiate the upload } break; case 1: if(resultCode==RESULT_OK) { Uri uri=data.getData(); dir=new File(uri.getPath()); dirname=dir.getName(); //addgestures(); } break; } super.onActivityResult(requestCode, resultCode, data); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); cView = (customview)findViewById(R.id.customview1); LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.VERTICAL); mStoreFile= new File(Environment.getExternalStorageDirectory(), "gestures"); if (sStore == null) { sStore = GestureLibraries.fromFile(mStoreFile); } dotask=new task(); //select=(Button)findViewById(R.id.button1); } public boolean onCreateOptionsMenu(Menu menu) { //call the base class to include system menus super.onCreateOptionsMenu(menu); menu.add(0,1,0,"Open File"); // title menu.add(0,2,1,"Smoothen"); menu.add(0,3,2,"add to gesture library"); menu.add(0,4,3,"Assign a name"); menu.add(0,5,4,"select a folder"); menu.add(0,6,5,"Exit"); //It is important to return true to see the menu return true; } public boolean onOptionsItemSelected(MenuItem item) { // Handle item selection switch (item.getItemId()) { case 1: showFileChooser(); return true; case 2: smoothPoint(); return true; case 3: /*if(name.length()&lt;1) Toast.makeText(getApplicationContext(), "Give a name to the gesture ist", Toast.LENGTH_LONG).show(); else { gest=cView.batchprocess(pathchk); saveGesture(name, gest); }*/ addgestures(); return true; case 4: nameDialog(); return true; case 5: Intent intent = new Intent("org.openintents.action.PICK_DIRECTORY"); intent.setData(Uri.parse("file:///sdcard")); intent.putExtra("org.openintents.extra.TITLE", "Please select a folder"); intent.putExtra("org.openintents.extra.BUTTON_TEXT", "Use this folder"); startActivityForResult(intent, 1); return true; case 6: Toast.makeText(getApplicationContext(), "exiting", Toast.LENGTH_LONG).show(); System.exit(1); return true; default: return super.onOptionsItemSelected(item); } } public void nameDialog() { AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle("Title"); alert.setMessage("Message"); // Set an EditText view to get user input final EditText input = new EditText(this); alert.setView(input); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { name = input.getText().toString(); //Log.d("name",name); check(); // Do something with value! } }); alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // Canceled. } }); alert.show(); } public static GestureLibrary get() { return sStore; } public void check() { if(name.length()&lt;1) Toast.makeText(this,"No name is set for this gesture",Toast.LENGTH_SHORT).show(); else Toast.makeText(this,"GESTURE NAME IS "+name,Toast.LENGTH_SHORT).show(); } public void saveGesture(String name,Gesture gest) { final GestureLibrary store = get(); store.addGesture(name, gest); store.save(); } } </code></pre>
 

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