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POAsyctask generating future task exception
 

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    <p>I want to create a reminder</p> <p>I have created a database. Database stores date and time. upto here everything is working. Now, I want to run an <code>asynctask</code> in background which checks after every few seconds if there is new reminder if yes then call to another activity using intent that generate <code>notificaton</code>. Also for checking in to database it is calling a different activity. I have created an infinite while loop so that it keeps on checking.</p> <p>here is code.In this I am comparing current date and time with the date date and time stored in database.The complete logic of comparison is written in reminder activity.Create_notification is an Activity data has the logic of creating notification</p> <pre><code>public class Async_task extends AsyncTask&lt;Void, Void, ArrayList&lt;String&gt;&gt;{ MainActivity async_task_context = null; public Async_task(MainActivity context) { async_task_context = context; // TODO Auto-generated constructor stub } @Override protected ArrayList&lt;String&gt; doInBackground(Void... params) { // TODO Auto-generated method stub Log.d("in async task", "msg"); while(1&lt;2){ Calendar cal = Calendar.getInstance(); int current_day = cal.get(Calendar.DAY_OF_MONTH); Log.d("in do in background", ""); int cuurent_month = cal.get(Calendar.MONTH); int current_year = cal.get(Calendar.YEAR); int curent_hour = cal.get(Calendar.HOUR_OF_DAY); int current_minute = cal.get(Calendar.MINUTE); String date = current_day+"/"+cuurent_month+"/"+current_year; String time = curent_hour+":"+current_minute; ArrayList&lt;String&gt; arr = new ArrayList&lt;String&gt;(); Reminder fetch_info = new Reminder(async_task_context); fetch_info.open(); arr = fetch_info.fetch(date,time); fetch_info.close(); Log.d("arr in oncreate", ""+arr); int size = arr.size(); if(size !=0){ Intent in = new Intent(async_task_context,Create_notification.class); in.putExtra("information", arr); try { Thread.sleep(9000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return arr; } </code></pre> <p>On running <code>logcat</code> I came across the following errors</p> <pre><code>08-30 18:13:18.701: E/AndroidRuntime(797): java.lang.RuntimeException: An error occured while executing doInBackground() 08-30 18:13:18.701: E/AndroidRuntime(797): at android.os.AsyncTask$3.done(AsyncTask.java:299) 08-30 18:13:18.701: E/AndroidRuntime(797): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 08-30 18:13:18.701: E/AndroidRuntime(797): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 08-30 18:13:18.701: E/AndroidRuntime(797): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 08-30 18:13:18.701: E/AndroidRuntime(797): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 08-30 18:13:18.701: E/AndroidRuntime(797): at android.os.Handler.&lt;init&gt;(Handler.java:197) 08-30 18:13:18.701: E/AndroidRuntime(797): at com.Itspark.smartreminder.Reminder.&lt;init&gt;(Reminder.java:74) 08-30 18:13:18.701: E/AndroidRuntime(797): at com.Itspark.smartreminder.Async_task.doInBackground(Async_task.java:36) </code></pre> <p>Below is reminder class.Reminder class is creating database and it has many methode.</p> <pre><code>public class Reminder extends Activity{ public static final String Column_Id="_Id"; private static final String name = "Event_Name"; private static final String date = "Event_date"; private static final String time = "Event_time"; private static final String location = "Event_location"; private static final String Table_Name="Data_container"; private static final String Database_Name="Data_Ship"; private static final int Version=1; private Context ourcontext; private SQLiteDatabase ourSQLiteDatabase; private DbHelper ourHelper; private static class DbHelper extends SQLiteOpenHelper{ public DbHelper(Context context) { super(context, Database_Name, null, Version); } @Override public void onCreate(SQLiteDatabase db) { Log.d("in on create", "before"); db.execSQL("CREATE TABLE "+ Table_Name + "(" +Column_Id+" INTEGER PRIMARY KEY AUTOINCREMENT, " + name +" TEXT NOT NULL, " + date +" TEXT NOT NULL, "+ time +" TEXT NOT NULL, "+ location +" TEXT );"); Log.d("in on create", ""); } @Override public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) { db.execSQL("DROP TABLE IF EXISTS "+Table_Name); onCreate(db); } } public Reminder(Context c) { //**This is line 74** ourcontext = c; } public Reminder open(){ ourHelper = new DbHelper(ourcontext); ourSQLiteDatabase = ourHelper.getWritableDatabase(); return this; } public void close(){ ourHelper.close(); } public ArrayList&lt;String&gt; fetch(String date2, String time2) { // TODO Auto-generated method stub String anArray[] = new String[] {Column_Id,name,date,time,location}; Cursor cu = ourSQLiteDatabase.query(Table_Name, anArray, date+" =?"+" AND "+time+" =?", new String[] {date2,time2}, null, null, null); Log.d("after cursor","ere"); int name1=cu.getColumnIndex(name); int date1 = cu.getColumnIndex(date); int time1 = cu.getColumnIndex(time); int location1 = cu.getColumnIndex(location); ArrayList&lt;String&gt; arr = new ArrayList&lt;String&gt;(); for(cu.moveToFirst();!cu.isAfterLast();cu.moveToNext()){ arr.add("Name "+cu.getString(name1)+ "\nDate "+cu.getString(date1)+"\nTime "+cu.getString(time1)+"\nLocation "+cu.getString(location1)); } return arr; } </code></pre>
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    1. COtry commenting out the `sleep`. What do u get ?
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    2. COAfter commenting sleep I am getting same exception
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    3. COWhat does the `Reminder` class do? Specifically, what is on `line 74` of `Reminder.java`?
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