I am working on BroadcastReceiver. My code are as follows:
Settings2
classpublic void set_notification_task()
{
Utilities.initParse(Settings2.this);
get_notification_info();
}
public void get_notification_info()
{
...
}
private void setAlarm_manager(Calendar c)
{
Intent intent = new Intent(Settings2.this, AlarmBroadcastReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(Settings2.this, ALARM_RUEST, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
}
}
public class AlarmBroadcastReceiver extends BroadcastReceiver {
final public static String ONE_TIME = "onetime";
SharedPreferences settings;
Settings2 setting_activity;
public AlarmBroadcastReceiver() { }
public AlarmBroadcastReceiver(Settings2 setting_Context){
setting_activity =setting_Context;
}
@Override
public void onReceive(Context context, Intent intent)
{
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "YOUR TAG");
//Acquire the lock
wl.acquire();
//You can do the processing here.
Bundle extras = intent.getExtras();
StringBuilder msgStr = new StringBuilder();
if(extras != null && extras.getBoolean(ONE_TIME, Boolean.FALSE)){
//Make sure this intent has been sent by the one-time timer button.
msgStr.append("One time Timer : ");
}
Format formatter = new SimpleDateFormat("hh:mm:ss a");
msgStr.append(formatter.format(new Date()));
Toast.makeText(context, "hello", Toast.LENGTH_LONG).show();
wl.release(); //Release the lock
setting_activity.set_notification_task(); //line 49
}
}
11-07 00:28:02.514: E/AndroidRuntime(25045): FATAL EXCEPTION: main
11-07 00:28:02.514: E/AndroidRuntime(25045): Process: com.abc.wmn, PID: 25045
11-07 00:28:02.514: E/AndroidRuntime(25045): java.lang.RuntimeException: Unable to start receiver com.abc.utilities.AlarmBroadcastReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.abc.wmn.Settings2.set_notification_task()' on a null object reference
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2739)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.app.ActivityThread.access$1800(ActivityThread.java:153)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1428)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.os.Handler.dispatchMessage(Handler.java:102)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.os.Looper.loop(Looper.java:148)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.app.ActivityThread.main(ActivityThread.java:5438)
11-07 00:28:02.514: E/AndroidRuntime(25045): at java.lang.reflect.Method.invoke(Native Method)
11-07 00:28:02.514: E/AndroidRuntime(25045): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
11-07 00:28:02.514: E/AndroidRuntime(25045): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
11-07 00:28:02.514: E/AndroidRuntime(25045): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.abc.wmn.Settings2.set_notification_task()' on a null object reference
11-07 00:28:02.514: E/AndroidRuntime(25045): at com.abc.utilities.AlarmBroadcastReceiver.onReceive(AlarmBroadcastReceiver.java:49)
11-07 00:28:02.514: E/AndroidRuntime(25045): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2732)
11-07 00:28:02.514: E/AndroidRuntime(25045): ... 8 more
It got the above logcat problem: java.lang.RuntimeException: Unable to start receiver com.abc.utilities.AlarmBroadcastReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.abc.wmn.Settings2.set_notification_task()' on a null object reference
, how can this be solved?
Thanks!
I have solved as follows:
public class AlarmBroadcastReceiver extends BroadcastReceiver {
final public static String ONE_TIME = "onetime";
SharedPreferences settings;
Settings2 setting_activity;
public AlarmBroadcastReceiver() { }
public AlarmBroadcastReceiver(Settings2 setting_Context){
setting_activity =setting_Context;
}
@Override
public void onReceive(Context context, Intent intent)
{
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "YOUR TAG");
//Acquire the lock
wl.acquire();
//You can do the processing here.
Bundle extras = intent.getExtras();
StringBuilder msgStr = new StringBuilder();
if(extras != null && extras.getBoolean(ONE_TIME, Boolean.FALSE)){
//Make sure this intent has been sent by the one-time timer button.
msgStr.append("One time Timer : ");
}
Format formatter = new SimpleDateFormat("hh:mm:ss a");
msgStr.append(formatter.format(new Date()));
Toast.makeText(context, "hello", Toast.LENGTH_LONG).show();
wl.release(); //Release the lock
setting_activity = new Settings2();
setting_activity.set_notification_task();
}
}