Databases
StackOverflow2013
Postsdbo
POCalling a method inside Activity from BroadcastReceiver
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCalling a method inside Activity from BroadcastReceiver
    primarykey
    data
    text
    <p>I'm using Parse.com service to send a push notification and have a broadcast receiver to receive the message. I want to call a method in my activity from broadcast receiver to show a Toast message(Actually I wanted to update listview content but for now I just use Toast to check if the method was called successfully) without calling the activity. </p> <p>First I follow this <a href="https://stackoverflow.com/a/18929801/3050636">instruction</a> :</p> <p>but it produce errors :</p> <pre><code>12-20 20:53:33.892: E/AndroidRuntime(14245): FATAL EXCEPTION: main 12-20 20:53:33.892: E/AndroidRuntime(14245): java.lang.RuntimeException: Unable to start receiver event.planner.services.CustomReceiver: java.lang.NullPointerException 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2236) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.app.ActivityThread.access$1500(ActivityThread.java:130) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1271) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.os.Handler.dispatchMessage(Handler.java:99) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.os.Looper.loop(Looper.java:137) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.app.ActivityThread.main(ActivityThread.java:4745) 12-20 20:53:33.892: E/AndroidRuntime(14245): at java.lang.reflect.Method.invokeNative(Native Method) 12-20 20:53:33.892: E/AndroidRuntime(14245): at java.lang.reflect.Method.invoke(Method.java:511) 12-20 20:53:33.892: E/AndroidRuntime(14245): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 12-20 20:53:33.892: E/AndroidRuntime(14245): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-20 20:53:33.892: E/AndroidRuntime(14245): at dalvik.system.NativeStart.main(Native Method) 12-20 20:53:33.892: E/AndroidRuntime(14245): Caused by: java.lang.NullPointerException 12-20 20:53:33.892: E/AndroidRuntime(14245): at event.planner.services.CustomReceiver.onReceive(CustomReceiver.java:60) 12-20 20:53:33.892: E/AndroidRuntime(14245): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2229) 12-20 20:53:33.892: E/AndroidRuntime(14245): ... 10 more 12-20 20:53:35.883: I/Process(14245): Sending signal. PID: 14245 SIG: 9 12-20 20:53:41.322: E/Trace(15934): error opening trace file: No such file or directory (2) 12-20 20:53:41.615: E/com.parse.PushService(15934): The Parse push service cannot start because Parse.initialize has not yet been called. If you call Parse.initialize from an Activity's onCreate, that call should instead be in the Application.onCreate. Be sure your Application class is registered in your AndroidManifest.xml with the android:name property of your &lt;application&gt; tag. </code></pre> <p>and then I tried to use static method as described <a href="https://stackoverflow.com/questions/2002288/static-way-to-get-context-on-android/5114361#5114361">here</a>, it produces the following error:</p> <pre><code>12-20 20:18:49.553: E/AndroidRuntime(11779): FATAL EXCEPTION: main 12-20 20:18:49.553: E/AndroidRuntime(11779): java.lang.RuntimeException: Error receiving broadcast Intent { act=com.example.UPDATE_STATUS flg=0x10 (has extras) } in event.planner.services.CustomReceiver@41036bd0 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:765) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.os.Handler.handleCallback(Handler.java:615) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.os.Handler.dispatchMessage(Handler.java:92) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.os.Looper.loop(Looper.java:137) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.app.ActivityThread.main(ActivityThread.java:4745) 12-20 20:18:49.553: E/AndroidRuntime(11779): at java.lang.reflect.Method.invokeNative(Native Method) 12-20 20:18:49.553: E/AndroidRuntime(11779): at java.lang.reflect.Method.invoke(Method.java:511) 12-20 20:18:49.553: E/AndroidRuntime(11779): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 12-20 20:18:49.553: E/AndroidRuntime(11779): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-20 20:18:49.553: E/AndroidRuntime(11779): at dalvik.system.NativeStart.main(Native Method) 12-20 20:18:49.553: E/AndroidRuntime(11779): Caused by: java.lang.NullPointerException 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.widget.Toast.&lt;init&gt;(Toast.java:92) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.widget.Toast.makeText(Toast.java:238) 12-20 20:18:49.553: E/AndroidRuntime(11779): at event.planner.front.FrontLayout.UpdateList(FrontLayout.java:193) 12-20 20:18:49.553: E/AndroidRuntime(11779): at event.planner.services.CustomReceiver.onReceive(CustomReceiver.java:60) 12-20 20:18:49.553: E/AndroidRuntime(11779): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:755) 12-20 20:18:49.553: E/AndroidRuntime(11779): ... 9 more 12-20 20:18:52.613: I/Process(11779): Sending signal. PID: 11779 SIG: 9 12-20 20:18:58.762: E/Trace(12109): error opening trace file: No such file or directory (2) 12-20 20:18:59.603: E/com.parse.PushService(12109): The Parse push service cannot start because Parse.initialize has not yet been called. If you call Parse.initialize from an Activity's onCreate, that call should instead be in the Application.onCreate. Be sure your Application class is registered in your AndroidManifest.xml with the android:name property of your &lt;application&gt; tag. </code></pre> <p>How to do this properly? Thank you.</p> <p>My code after combining both methods:</p> <p><strong>CustomReceiver.java</strong></p> <pre><code>public class CustomReceiver extends BroadcastReceiver { private static final String TAG = "MyCustomReceiver"; public static final String ACTION = "com.example.UPDATE_STATUS"; FrontLayout main = null; public void setMainActivityHandler(FrontLayout main){ this.main=main; } @Override public void onReceive(Context context, Intent intent) { String title=""; String alert=""; try { JSONObject json = new JSONObject(intent.getExtras().getString("com.parse.Data")); Iterator&lt;?&gt; itr = json.keys(); while (itr.hasNext()) { String key = (String) itr.next(); if(key.equals("title")) title = json.getString(key); if(key.equals("alert")) alert = json.getString(key); else continue; } } catch (JSONException e) { Log.w(TAG, "JSONException: " + e.getMessage()); } SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss",Locale.US); Date date = new Date(); NotificationModel nm = new NotificationModel(); nm.setTitle(title); nm.setAlert(alert); nm.setDateTime(dateFormat.format(date)); NotificationDS nds = new NotificationDS(context); nds.insertNotification(nm); main.UpdateList(); } } </code></pre> <p><strong>AndroidManifest.xml</strong></p> <pre><code>&lt;application&gt; ..... &lt;service android:name="com.parse.PushService" /&gt; &lt;receiver android:name="com.parse.ParseBroadcastReceiver"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.BOOT_COMPLETED" /&gt; &lt;action android:name="android.intent.action.USER_PRESENT" /&gt; &lt;/intent-filter&gt; &lt;/receiver&gt; &lt;receiver android:name="event.planner.services.CustomReceiver" android:exported="false"&gt; &lt;intent-filter&gt; &lt;action android:name="com.example.UPDATE_STATUS" /&gt; &lt;/intent-filter&gt; &lt;/receiver&gt; &lt;/application&gt; &lt;application android:name="event.planner.services.MyApplication"&gt; &lt;/application&gt; </code></pre> <p><strong>FrontLayout.java</strong></p> <pre><code>public class FrontLayout extends Activity { .... CustomReceiver receiver = null; @Override protected void onCreate(Bundle savedInstanceState) { ...... receiver = new CustomReceiver(); receiver.setMainActivityHandler(this); IntentFilter callInterceptorIntentFilter = new IntentFilter("com.example.UPDATE_STATUS"); registerReceiver(receiver, callInterceptorIntentFilter); } public static void UpdateList() { Toast.makeText(MyApplication.getAppContext(), "Success!", Toast.LENGTH_SHORT).show(); } } </code></pre> <p><strong>MyApplication.java</strong></p> <pre><code>package event.planner.services; import android.app.Application; import android.content.Context; public class MyApplication extends Application{ private static Context context; public void onCreate(){ super.onCreate(); MyApplication.context = getApplicationContext(); } public static Context getAppContext() { return MyApplication.context; } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USAndy
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload