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我正在計算需要一些時間的事情。爲此，我已經創建了一個子類的AsyncTask一個內部類：AsyncTask錯誤困惑
private class AsyncAllPlayAll extends AsyncTask<String, Void, CharSequence>
{
StournamentDbAdapter mDbHelper;
public AsyncAllPlayAll(Context context, StournamentDbAdapter dbHelper)
{
this.mContext = context;
this.mDbHelper = dbHelper;
}
@Override
protected CharSequence doInBackground(String... tournamentRowIds)
{
Long tournamentRowId = Long.valueOf(tournamentRowIds[0]);
Tournament tournament = new Tournament(mDbHelper, tournamentRowId);
tournament.setupTournament();
Boolean tournamentHasWinner = mDbHelper.winningTournamentParticipantsExists(tournamentRowId);
// tournament already run: delete score
if(tournamentHasWinner)
{
mDbHelper.resetTournamentsStocksScore(tournamentRowId);
mDbHelper.resetTournamentWinnerStockId(tournamentRowId);
}
//run tournament!
tournament.allPlayAll();
TournamentParticipant tournamentParticipant = mDbHelper.insertWinningParticipant(tournamentRowId);
populateCompetitorsListView();
final CharSequence winner = "Winner is: " + tournamentParticipant.getStock().getName() + "(" + tournamentParticipant.getScore() + ")";
return winner;
}
@Override //the winner
protected void onPostExecute(final CharSequence result) {
super.onPostExecute(result);
final int duration = Toast.LENGTH_LONG;
TournamentEdit.this.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(mContext, "Hello", duration).show();
}
});
}
}
但我得到一個錯誤，我不放棄明白了：「不能內螺紋已不叫Looper.prepare創建處理程序（）「
我在stackoverflow上讀了幾個線程，但是實現了它們寫入的內容並沒有改變我的情況。
我確定錯誤來自於我在onPostExecute中運行的Toast，但這不是問題。該錯誤發起嘗試初始化錦標賽。
Tournament tournament = new Tournament(mDbHelper, tournamentRowId);
這裏是我的籌碼：
Thread [<11> AsyncTask #1] (Suspended)
FragmentManagerImpl$1.<init>(FragmentManagerImpl) line: 423
FragmentManagerImpl.<init>() line: 423
Tournament(Activity).<init>() line: 702
Tournament.<init>(StournamentDbAdapter, Long) line: 48
TournamentEdit$AsyncAllPlayAll.doInBackground(String...) line: 346
TournamentEdit$AsyncAllPlayAll.doInBackground(Object...) line: 1
AsyncTask$2.call() line: 264
FutureTask$Sync.innerRun() line: 305
AsyncTask$3(FutureTask).run() line: 137
AsyncTask$SerialExecutor$1.run() line: 208
ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) line: 1076
ThreadPoolExecutor$Worker.run() line: 569
Thread.run() line: 856
我tohught它可能是一些問題與分貝線程？當我從主線程傳遞給AsyncAllPlayAll時。
於是，我就打開內部類的分貝線程（不同的實例），並改變了它的構造函數：
public AsyncAllPlayAll(Context context, StournamentDbAdapter dbHelper)
{
this.mContext = context;
this.mDbHelper = dbHelper;
mDbHelper = new StournamentDbAdapter(context);
mDbHelper.open();
}
這並沒有幫助:(
現在我嘗試添加一個尺蠖（如AsyncTask and Looper.prepare() error建議）
@Override
protected CharSequence doInBackground(String... tournamentRowIds)
{
Looper.prepare();
Long tournamentRowId = Long.valueOf(tournamentRowIds[0]);
Tournament tournament = new Tournament(mDbHelper, tournamentRowId);
tournament.setupTournament();
Boolean tournamentHasWinner = mDbHelper.winningTournamentParticipantsExists(tournamentRowId);
// tournament already run: delete score
if(tournamentHasWinner)
{
mDbHelper.resetTournamentsStocksScore(tournamentRowId);
mDbHelper.resetTournamentWinnerStockId(tournamentRowId);
}
//run tournament!
tournament.allPlayAll();
TournamentParticipant tournamentParticipant = mDbHelper.insertWinningParticipant(tournamentRowId);
populateCompetitorsListView();
final CharSequence winner = "Winner is: " + tournamentParticipant.getStock().getName() + "(" + tournamentParticipant.getScore() + ")";
Looper.loop();
return winner;
}
代碼走得更遠，但我得到了以下錯誤：
引起：android.view.ViewRootImpl $ CalledFromWrongThreadException：只有創建視圖層次結構的原始線程可以觸及其視圖。
現在populateCompetitorsListView（）是導致飛機失事的原因，它也清楚爲什麼：看populateCompetitorsListView（）的最後一行，這是
setListAdapter(tournamentStocks);
試圖改變主線程。我將它移到了主類中，這似乎修正了它：計算運行。
@SuppressWarnings("deprecation")
private void populateCompetitorsListView()
{
// Get all of the notes from the database and create the item list
Cursor tournamentStocksCursor = mDbHelper.retrieveTrounamentStocks(mTournamentRowId);
startManagingCursor(tournamentStocksCursor);
// Create an array to specify the fields we want to display in the list (only name)
String[] from = new String[] {StournamentConstants.TblStocks.COLUMN_NAME, StournamentConstants.TblTournamentsStocks.TBL_COLUMN_TOURNAMENTS_STOCKS_STOCK_SCORE};
// and an array of the fields we want to bind those fields to (in this case just name)
int[] to = new int[]{R.id.competitor_name, R.id.competitor_score};
// Now create an array adapter and set it to display using our row
SimpleCursorAdapter tournamentStocks = new SimpleCursorAdapter(this, R.layout.competitor_row, tournamentStocksCursor, from, to);
//tournamentStocks.convertToString(tournamentStocksCursor);
setListAdapter(tournamentStocks);
}
但現在的問題是，我似乎被卡住內doInBackground（）由於Looper.loop（）的執行情況;這是猜測運行無止境的循環？
有沒有進一步的想法？
謝謝！