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POProgress dialog while running computation task in background (AsyncTask)
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copied!<p>I am very confused, i am trying for two days to make animation on an image while my engine is thinking of a move (this is a game app). I execute the chooseMove() method inside AsyncTask object because it is a little heavy recursive function that may take some time,and also i want to rotate an hourglass image while the engine is thinking. and i tried to do it every way i know: another AsyncTask, Android's own animation class,handlers etc'. but no matter what i do it seems that i can't make it work. if i try to execute two threads at the same time,it only executes one of them, and the same thing happens with android own animation class. so i tried to use a progress dialog just to see that i am not getting crazy,and guess what.. same problem! I show the progress dialog in the onPreExecute() ,but the doInBackgroun() never gets done! the progress dialog take control over the whole app for some reason. how should i do it? i though that the progress dialog is meant for this kind of things. thx!</p> <p>EDIT: this is the code of my async task class. as you can see, i am showing a progress dialog in the onPreExecute() ,and dismissing it in the onPostExecute. but the onPost never gets called because the doInBackground() never gets called either. </p> <pre><code>protected void onPreExecute() { super.onPreExecute(); activity.setPlaying(true); if (android.os.Build.VERSION.SDK_INT >android.os.Build.VERSION_CODES.GINGERBREAD) { // only for gingerbread and newer versions activity.invalidateOptionsMenu(); } progressDialog = new ProgressDialog(activity); progressDialog.setMessage("Thinking..."); progressDialog.setIndeterminate(true); progressDialog.setCanceledOnTouchOutside(false); progressDialog.show(); } @Override protected Integer doInBackground(Void... arg0) { int engineWin = board.takeWin(board.getBoard(), engine.getNumberOfEngine()); int opponentWin = board.takeWin(board.getBoard(), engine.getNumberOfOpponent()); if(engineWin!=-1){ try{ Thread.sleep(500); } catch(Exception e){} return engineWin; } else if(opponentWin!=-1){ try{ Thread.sleep(500); } catch(Exception e){} return opponentWin; } else{ if(engine.isEnginesTurn()&&!Board.checkGameOver(board.getBoard())){ int[] newBoard = new int[42]; System.arraycopy(board.getBoard(), 0, newBoard, 0, 42); return engine.chooseMove(engine.isEnginesTurn(),newBoard,-500001,500001,0,4).getMove(); } else{ return -1; } } } @Override protected void onProgressUpdate(Void... values) { super.onProgressUpdate(values); } @Override protected void onPostExecute(Integer result) { super.onPostExecute(result); progressDialog.dismiss(); if(result!=-1){ ballAnimTask = new BallAnimTask(activity,boardView,board,engine); ballAnimTask.execute(findSlotNumberByIndex(result)); } } </code></pre> <p>this is the recursive chooseMove() i am calling in doInBackground(). before i tried to show the progress dialog,everything worked just fine. there is no problem with this function or any other function for that matter. only when i tried to do animations or dialogs at the same time,i got issues. the chooseMove() is physically on another class and i am only calling it from the AsyncTask. maybe this is the problem?? </p> <pre><code>public Best chooseMove(boolean side,int[]board,int alpha,int beta,int depth,int maxDepth){ Best myBest = new Best(); Best reply; int num; if(Board.checkGameOver(board)||depth==maxDepth){ myBest.setScore(returnPositionScore(board)); return myBest; } if(side){ myBest.setScore(alpha); num = numberOfEngine; } else{ myBest.setScore(beta); num = numberOfOpponent; } ArrayList<Integer> availableMoves = new ArrayList<Integer>(); availableMoves = searchAvailableMoves(board); for(int move:availableMoves){ board[move] = num; reply = chooseMove(!side,board,alpha,beta,depth+1,maxDepth); board[move] = 0; if(side&&reply.getScore()>myBest.getScore()){ myBest.setMove(move); myBest.setScore(reply.getScore()); alpha = reply.getScore(); } else if(!side&&reply.getScore()<myBest.getScore()){ myBest.setMove(move); myBest.setScore(reply.getScore()); beta = reply.getScore(); } if(alpha>=beta){ return myBest; } } return myBest; } </code></pre>

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