I can't receive push notifications in app from

I configured Parse API in my app and everything works except push notifications. I tried to send them from the site but they don't arrive in app. I did everything as written in documentation, but I'm not able to receive notification pushes.

I was able to receive one and when I pressed it app crashed. Now I tried to change something but even with reversing I cannot receive them anymore. How can I resolve my problem?

EDIT: Since some users may be interested, here's the parts of the code I used for push notifications:

Main Class (not MainActivity though):

    public class InstantsApplication extends Application {
public void onCreate() {
    super.onCreate();
    // Hidden
    Parse.initialize(this, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 
    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");



    ParseInstallation.getCurrentInstallation().saveInBackground();

    ParsePush.subscribeInBackground("", new SaveCallback() {
        @Override
        public void done(ParseException e) {
            if (e == null) {
                Log.d("com.parse.push", "successfully subscribed to the broadcast channel.");

            } else {
                Log.e("com.parse.push", "failed to subscribe for push", e);
            }
        }
     }
}

AndroidManifest (permissions not here included, trust me I have put them):

<!-- PARSE -->
<service android:name="com.parse.PushService" />
<receiver android:name="com.parse.ParseBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
        <action android:name="android.intent.action.USER_PRESENT" />
    </intent-filter>
</receiver>
<receiver android:name="com.parse.GcmBroadcastReceiver"
          android:permission="com.google.android.c2dm.permission.SEND">
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

        <!--
          IMPORTANT: Change "com.parse.tutorials.pushnotifications" to match your app's package name.
        -->
        <!-- I have hidden package name root for this question -->
        <category android:name="com.xxxxxxxx.instants" />


    </intent-filter>
</receiver>
<receiver android:name="com.parse.ParsePushBroadcastReceiver" android:exported="false">
    <intent-filter>
        <action android:name="com.parse.push.intent.RECEIVE" />
        <action android:name="com.parse.push.intent.DELETE" />
        <action android:name="com.parse.push.intent.OPEN" />
    </intent-filter>
</receiver>
</application>

I met this problem before, that because you use the newest Parse api. There are just a few changes you need to make.

First, to fix the error directly caused by issuing the push from the Parse backend you need to declare a notification icon for the Parse push in your Manifest.

 <meta-data android:name="com.parse.push.notification_icon"
            android:resource="@drawable/ic_launcher"/>

use before the closing application-Tag.

Issuing another push from the backend now will give you a push notification as you expect. So far so good. Clicking the push will result in an app crash again. To fix this you need to remove the now deprecated call PushService.setDefaultPushCallback(...) and add your own Receiver class. I did this in the *.util package just as the following:

public class Receiver extends ParsePushBroadcastReceiver {

    @Override
    public void onPushOpen(Context context, Intent intent) {
        Intent i = new Intent(context, MainActivity.class);
        i.putExtras(intent.getExtras());
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }
}

Next, change the default Parse receiver to the one just created: - Go to your Manifest file.

 <receiver
            android:name="your.package.name.utils.Receiver"
            android:exported="false" >
            <intent-filter>
                <action android:name="com.parse.push.intent.RECEIVE" />
                <action android:name="com.parse.push.intent.DELETE" />
                <action android:name="com.parse.push.intent.OPEN" />
            </intent-filter>
        </receiver>