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POjava.lang.NullPointerException error when using alarm manager
 

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  1. POjava.lang.NullPointerException error when using alarm manager
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    <p>This error <code>java.lang.NullPointerException</code> is be displaying, when I use alarm manager to fire notification using receiver.</p> <p>I select an item from <code>listView</code> then it call <code>setNotification</code> method then it set repeating alarm to fire notification.</p> <p>This is the code:</p> <pre><code>public class TimesActivity extends OptionsMenu { ArrayList&lt;String&gt; getTiName = new ArrayList&lt;String&gt;(); ArrayList&lt;String&gt; getTiTime = new ArrayList&lt;String&gt;(); ArrayList&lt;String&gt; getTiBroad = new ArrayList&lt;String&gt;(); ArrayList&lt;String&gt; getTiImg = new ArrayList&lt;String&gt;(); public DAOTimes timeDatabase = null; int minutes; String prNameSelected; String prTimeSelected; Long now, start; int period; AlarmManager am; // ============================================================================= @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listvideo); timeDatabase = new DAOTimes(this); getTimes(); showTimes(); } // ============================================================================= @Override protected Dialog onCreateDialog(int id) { switch (id) { case 0: // Create out AlterDialog final CharSequence[] array = { "5 min", "10 min", "15 min", "45 min", "60 min" }; Builder builder = new AlertDialog.Builder(this); builder.setCancelable(true); builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { } }); builder.setSingleChoiceItems(array, -1, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub if (array[which] == "1 min") { minutes = 1; } else if (array[which] == "10 min") { minutes = 10; } else if (array[which] == "15 min") { minutes = 15; } else if (array[which] == "45 min") { minutes = 45; } else if (array[which] == "60 min") { minutes = 60; } dialog.dismiss(); } }); AlertDialog dialog = builder.create(); dialog.show(); } return super.onCreateDialog(id); } // ============================================================================= public void setNotification() { Toast.makeText(TimesActivity.this, "result : ", Toast.LENGTH_LONG).show(); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.MILLISECOND, period); Intent intent = new Intent(this, NotAlarm.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 30000, pendingIntent); } // ============================================================================= public void showTimes() { final ListView listview = (ListView) findViewById(R.id.listView1); listview.setOnItemClickListener(new ListView.OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View v, int position, long id) { prNameSelected = getTiName.get(position); prTimeSelected = getTiTime.get(position); String date = getIntent().getStringExtra("DAY_DATE"); SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd, HH:mm:ss.SS"); format.setLenient(false); Calendar calendar = Calendar.getInstance(); int year = calendar.get(Calendar.YEAR); int month = calendar.get(Calendar.MONTH); int day = calendar.get(Calendar.DAY_OF_MONTH); int hour = calendar.get(Calendar.HOUR_OF_DAY); int minute = calendar.get(Calendar.MINUTE); int second = calendar.get(Calendar.SECOND); int millisecond = calendar.get(Calendar.MILLISECOND); String time1 = year + "-" + (month + 1) + "-" + day + ", " + hour + ":" + minute + ":" + second + "." + millisecond; Date date1; try { date1 = format.parse(time1); now = date1.getTime(); } catch (ParseException e) { e.printStackTrace(); } String time2 = date + ", " + prTimeSelected + ":00.00"; Date date2; try { date2 = format.parse(time2); start = date2.getTime(); } catch (ParseException e) { e.printStackTrace(); } int result = (int) (start - now); if (start &gt; now) { period = result; } else { // period = start + (7 * 24 * 60 * 60 * 1000); } Toast.makeText(TimesActivity.this, "result : " + period, Toast.LENGTH_LONG).show(); setNotification(); // showDialog(0); } }); listview.setAdapter(new TimesAdapter(TimesActivity.this, getTiName .toArray(new String[getTiName.size()]), getTiTime .toArray(new String[getTiTime.size()]), getTiBroad .toArray(new String[getTiBroad.size()]), getTiImg .toArray(new String[getTiImg.size()]))); } } </code></pre> <p>Receiver activity:</p> <pre><code>package com.shadatv.shada; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; public class NotAlarm extends BroadcastReceiver { NotificationManager nm; @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub NotificationManager nm = (NotificationManager) context .getSystemService(Context.NOTIFICATION_SERVICE); Notification.Builder builder = new Notification.Builder(context); builder.setSmallIcon(android.R.drawable.btn_star); builder.setTicker("notification"); Notification notify = builder.getNotification(); CharSequence title = "you have been notified"; CharSequence details = "bvcburhvurh uhuh hghu hu"; PendingIntent pending = PendingIntent .getActivity(context, 0, new Intent(), 0); notify.setLatestEventInfo(context, title, details, pending); nm.notify(0, notify); } } </code></pre> <p>logCat:</p> <pre><code>03-27 10:39:33.550: E/AndroidRuntime(3890): FATAL EXCEPTION: main 03-27 10:39:33.550: E/AndroidRuntime(3890): java.lang.NullPointerException 03-27 10:39:33.550: E/AndroidRuntime(3890): at com.shadatv.shada.TimesActivity.setNotification(TimesActivity.java:161) 03-27 10:39:33.550: E/AndroidRuntime(3890): at com.shadatv.shada.TimesActivity$3.onItemClick(TimesActivity.java:228) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.widget.AdapterView.performItemClick(AdapterView.java:292) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.widget.AbsListView.performItemClick(AbsListView.java:1179) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2707) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.widget.AbsListView$1.run(AbsListView.java:3462) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.os.Handler.handleCallback(Handler.java:605) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.os.Handler.dispatchMessage(Handler.java:92) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.os.Looper.loop(Looper.java:137) 03-27 10:39:33.550: E/AndroidRuntime(3890): at android.app.ActivityThread.main(ActivityThread.java:4507) 03-27 10:39:33.550: E/AndroidRuntime(3890): at java.lang.reflect.Method.invokeNative(Native Method) 03-27 10:39:33.550: E/AndroidRuntime(3890): at java.lang.reflect.Method.invoke(Method.java:511) 03-27 10:39:33.550: E/AndroidRuntime(3890): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 03-27 10:39:33.550: E/AndroidRuntime(3890): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 03-27 10:39:33.550: E/AndroidRuntime(3890): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. PO
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    1. PTQuestion
    1. USplsgogame
    1. USeng.ahmed
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POjava.lang.NullPointerException error when using alarm manager
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COTry with my solution. It might help you.
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      1. POjava.lang.NullPointerException error when using alarm manager
      1. USAjay S
    2. CO@Ahmed Galal: i think u forget to initialize am AlarmManager. initialize it in onCreate method before calling getTimes() method
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      1. POjava.lang.NullPointerException error when using alarm manager
      1. USρяσѕρєя K
    3. COi initialized it already in the class
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      1. POjava.lang.NullPointerException error when using alarm manager
      1. USeng.ahmed
 

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