[解決]基本的Android的AsyncTask,在執行doInBackground發生錯誤()
我試圖創建如圖所示爲Android的API文檔中使用的AsyncTask基本線程。然而,當我嘗試執行最簡單的線程時遇到錯誤。
AsyncTask task = new AsyncTask<Void, Integer, Boolean>() {
@Override
protected Boolean doInBackground(Void... arg0) {
try {
Thread.sleep(6000);
System.out.println("DELAYED TEST TEST TEST");
}catch(Exception e) {
}
return true;
}
};
logcat的條目:
E/AndroidRuntime(21215): FATAL EXCEPTION: AsyncTask #1
E/AndroidRuntime(21215): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(21215): at android.os.AsyncTask$3.done(AsyncTask.java:200)
E/AndroidRuntime(21215): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
E/AndroidRuntime(21215): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
E/AndroidRuntime(21215): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
E/AndroidRuntime(21215): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
E/AndroidRuntime(21215): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
E/AndroidRuntime(21215): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
E/AndroidRuntime(21215): at java.lang.Thread.run(Thread.java:1027)
E/AndroidRuntime(21215): Caused by: java.lang.ClassCastException: [Ljava.lang.Object;
E/AndroidRuntime(21215): at hlf.scenes.Intro$2.doInBackground(Intro.java:1)
E/AndroidRuntime(21215): at android.os.AsyncTask$2.call(AsyncTask.java:185)
E/AndroidRuntime(21215): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
E/AndroidRuntime(21215): ... 4 more
如果有人可以幫助我解決這個我會非常感激! 感謝
修復:
AsyncTask<Void, Integer, Boolean> task = new AsyncTask<Void, Integer, Boolean>()
試試這個..... AsyncTask task = new AsyncTask () –
是否在UI線程上創建任務實例? – Ally
@kumar:我不這麼認爲。泛型類型不被編譯。 – njzk2