Application abnormal behavior does not start activity mentioned in intent

Question

I have 3 major class in the application

1) Intent service: where I receive push notification and open activity according to notification message and other two classes behavior. below is the code which does that

 if(Global.isMainScreenRunning){
   Intent intent = new Intent(this, MainScreen.class);
   intent.setFlag(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(intent);
} else if(!Global.NotificationScreenRunning){
   Intent intent = new Intent(this, NotificationScreen.class);
   intent.setFlag(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(intent);
}

2) NotificationScreen : This is the mediator screen so if the application is not running this screen will be shown first and on click of yes button of this screen MainScreen will be opened and this screen will be finished.

3) Main screen: This is the main screen of the application which show map. its core behavior is that ts a launchmode="singletask" mentioned in menifest file, which means if this screen is running its hole data will be sent to onNewIntent() method rather than opening this screen again.

Now what is happening in flow is

Step 1: application is in background and push notification comes. condition run and the second condition gets success and notification screen intent is shot

step 2: In notification screen I click on ye button to move on to the next main screen

step 3: In Main screen I process this info and perform task or just close the application

Step 4: again a new notification is received and as the application is not running is goes to second condition and start the intent for notification screen but this time no notification screen is launched instead of providing its intent and main screen is launched which is wrong.

This is the abnormal behavior which I am facing that instead of providing class of notification screen for intent main screen is launched which is totally different behavior of application according to android.

Any help from any one who come across such problem will be greatly appreciated.

Edit

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.app"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.front" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-feature android:name="android.hardware.microphone" />

    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />

    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />

    <permission android:name="com.example.app.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />
    <uses-permission android:name="com.example.app.permission.C2D_MESSAGE" />

    <supports-screens
        android:largeScreens="true"
        android:normalScreens="true"
        android:smallScreens="true"
        android:xlargeScreens="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/android_app_icon"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".SplashScreen"
            android:configChanges="keyboardHidden|orientation"
            android:label="@string/app_name"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".MainScreen"
            android:configChanges="keyboardHidden|orientation"
            android:launchMode="singleTask"
            android:excludeFromRecents="true"
            android:screenOrientation="portrait" >
        </activity>
        <activity
            android:name=".NotificationScreen"
            android:configChanges="keyboardHidden|orientation"
            android:excludeFromRecents="true"
            android:screenOrientation="portrait" >
        </activity>

        <receiver
            android:name=".pushnotification.GcmBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <category android:name="com.selebrety.app" />
            </intent-filter>
        </receiver>

        <service android:name=".pushnotification.GcmIntentService" />

        <meta-data android:name="com.google.android.gms.version"
           android:value="@integer/google_play_services_version" />
    </application>

</manifest>

Second Edit

The mobile in which I am testing is "YU Yureka" here is its specification link. Current it have android 5.0.2 OS

Third Edit

To test this behavior I have debugged the code from eclipse debugger. To check this I have put a break point in NotificationScreen onResume and onCreate but it was never hit instead of onResume of MainScreen is hit.

Also I added a logs in if and else condition but still logs for else condition is printed.

Fourth Edit Global.isMainScreenRunning: is global boolean variable which is done false in onPause of MainScreen and done true in onResume of MainScreen.

Global.NotificationScreenRunning: is global boolean variable which is done false in onPause of NotificationScreen and done true in onResume of NotificationScreen.

Answer 1

Global state is evil, and this question demonstrates why. To understand what's happening, you'll have to look at every place where your global flags are set or cleared, and analyze all the possible execution paths that might lead there. That's way beyond the scope of the kind of help you can get on SO. And there's an extra complication on Android, since the entire VM might be destroyed (and all your globals cleared) any time your app is in the background. Just as bad, the VM and the Application instance might be retained after you exit the last activity. When that happens, Application#onCreate(...) will not be called again the next time you start the app, and all your static globals will still be set to whatever they were when you last ran the app.

Save yourself a lot of hair-pulling and stop using global state.

Answer 2

You can try add android:taskAffinity=":main" to your MainScreen activity in manifest.
Maybe because the MainScreen still in a same task with the NotificationScreen so it's was call up all the task when NotificationScreen called again.
You can try this demo for more visual: play app and code
Hope it help.

Answer 3

As I got your point you want to resume Notification Screen every time when you get notification in the app.For this I can suggest a solution this will make the application runs and allows you to achieve expected behavior but when you press home button your Main screen will no longer active.It will be killed.As we all know android maintains activity stacks for all acticities.So if you press device back button then activity will be poped out from stack and you will not face this problem.

I think this is a standard behavior of activity stacks for more information you can go with this link:

http://www.slideshare.net/RanNachmany/manipulating-android-tasks-and-back-stack

You can try this code snippet:

Intent i = new Intent(NotificationFullScreen.this,
      MainActivity.class);
    i.putExtra("FROM", "Notification");
    i.putExtra("bookingId", bookingId);
    i.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY
      | Intent.FLAG_FROM_BACKGROUND);
    startActivity(i);
    NotificationFullScreen.this.finish();

Answer 4

Hi @Abhinbav Singh Maurya

I think the problem is that main screen is getting called from your splash screen declared in the manifest as the application launch screen, so when the app is killed and you are calling the intent this will get called.

Instead of that what can you do is broadcast the message to the splash screen and receive it in splash screen and based on condition call the intent from there.

Again here there is a thing that you should take care of, you have to broad cast the intent only after the receiver is registered in the SplahScreen, else it will never be received. so try to user handler.postDelayed method and broadcast after 1000 ms or 700 ms.

 Intent mIntent = new Intent(context, SplashScreen.class);
                mIntent.setAction(Intent.ACTION_MAIN);
                mIntent.addCategory(Intent.CATEGORY_LAUNCHER);
                mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(mIntent);
broadcastMessage(context, message);

I have answered a similar question in the following thread. here

I think this is what you are looking for. Please let me know if this met your requirement or not, if you find the answer useful, if my answer helps you, up vote the answer so that it will be useful to others.

Cheers :)

Edit

I have did a bit research on it.

You can have two launcher activities according to this link.

Try it and let me know. Hope this helps you. :)

Answer 5

if(Global.isMainScreenRunning){
   Intent intent = new Intent(this, MainScreen.class);
   intent.setFlag(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(Intent);//here is the problem change Intent to intent 

} else if(!Global.NotificationScreenRunning){
   Intent intent = new Intent(this, NotificationScreen.class);
   intent.setFlag(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(intent);
}