Develop Reference

Android launchMode="singleTask" and Intent-filters

So I have an Activity A that is defined in the AndroidManifest.xml as defined below:
<activity
android:name=".activity.A"
android:screenOrientation="landscape"
android:windowSoftInputMode="stateAlwaysHidden"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
This Activity launches a welcome Screen which we will call Activity B.
If you launch the application the Welcome screen is displayed and then once the user is done with it Activity A comes back.
The issue I am having is when I push the "Home" button from the welcome screen I go back to the Home Screen as expected. Now when I reclick on the Application Icon the application won't launch. Instead both my Activity A & B get destroyed. If I click on the icon again then the application relaunches as expected.
Now if I'm on the welcome screen and push the back arrow and reclick on the App icon it launches the application as expected. I don't have to push it twice.
Unfortunately I have to use the launchMode="singleTask" since it is a requirement for integration with another team. I have read the Android API's for Tasks and Back Stacks numerous times. Any pointers or suggestions would be greatly appreciated.
I came across a blog indicating there is an undocumented bug with using singleTask and intent-filters together but didn't find any official documentation on this.
Thanks
EDIT
Launching Activity B like this:
Intent intent = new Intent(context, B.class);
startActivityForResult(intent, CONST_VAR);

I tried making two activities which launches ActivityB from Activity A. I see no such problem as described in the question. PFB my manifest. Also, when you say home button, is it Phone home button or your app specific home button. PFB my manifest
<activity
android:name="com.android.testsingletask.MainActivity"
android:launchMode="singleTask"
android:screenOrientation="landscape"
android:windowSoftInputMode="stateAlwaysHidden"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.android.testsingletask.WelcomeActivity"
android:screenOrientation="landscape"
android:windowSoftInputMode="stateAlwaysHidden"
android:label="#string/app_name" >
</activity>

Android Activity Task in foreground

I have 3 activity tasks A-B-C
<activity android:name=".LoginActivity"
android:label="#string/app_name"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".DashboardActivity"
android:label="#string/app_name" >
</activity>
<activity android:name=".CreateNewPolygonActivity"
android:label="#string/app_name"
android:launchMode="singleTask"
android:alwaysRetainTaskState="true"
android:configChanges="orientation|keyboard|keyboardHidden">
</activity>
<service android:name=".services.RecordCircuitService"
android:enabled="true" >
</service>
And I have a Service with GPS using LocationManager.
My application has this logic:
On launcher icon clicked - > start login activity
After login - > login activity is finish(); and start dashboardActivity
In the dashboard I start CreateNewPolygonActivity and start the Service with GPS
Press HOME (this is reorganize RecordActivity to foreground)
after I have some mistakes work
open CreateNewPolygonActivity with onCreate
open DashboardActivity
I think I have a problem with my task organization.

You won't achieve the desired result by setting launchMode="singleTask" for your activity. Android won't create a separate task for this because you've not set the taskAffinity. In any case, you don't want to do this by using launchMode="singleTask" because this causes more problems than it solves. This launch mode is intended for HOME-screen replacements only!
Remove launchMode="singleTask"`` fromCreateNewPolygonActivity`
Also, you should remove android:noHistory="true" from your login activity. This isn't necessary either. Since you've already finished the login activity when the user starts the DashboardActivity, when he presses the BACK button, it won't return to the login activity (which I assume is what you wanted).
Once you've done these things, please tell us what is still broken.

How to make sure that the launcher activity always run when the app is launched from the home

I have 2 activities in my app. The A activity is the launcher one. When I run the app the very first time, the launcher activity runs, but when I press the home button and restart the app from there by clicking the app icon, I always get the B activity running.
I want to make sure that the activity A should always run when starting the app.
This is the manifest code:
<application
android:icon="#drawable/icon"
android:label="#string/app_name" >
<activity
android:name="com.velosys.smsManager.Activities.a"
android:clearTaskOnLaunch="true"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.velosys.smsManager.Activities.b" />
</application>
I have searched a lot for this but did not get any clue.

Maybe android:launchMode="singleInstance" on activity B will get it done?

Android: Bug when changing the default activity

I'm having a problem with my app after changing the default activity in the manifest. This is the manifest after i changed it. As far as i can see it's syntactically correct.
<application android:icon="#drawable/icon" android:label="#string/app_name">
<uses-library android:name="com.google.android.maps" />
<activity android:name=".loginActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="CouncilPlannerActivity"></activity>
<activity android:name="MainTabActivity"></activity>
<activity android:name="MapTabActivity" android:theme="#android:style/Theme.NoTitleBar"></activity>
<activity android:name="NodeFormActivity"></activity>
<activity android:name="viewNewsActivity"></activity>
</application>
The problem is when i deploy the app to my device it works fine first time. However, when i close the app with the home button it refuses to open again. Clicking the icon in the devices app list doesn't do anything.
If i change the default activity to the one it was at originally it works fine. Is this a bug or is there another reference to a default activity that i'm missing?
I'm developing on Android 2.2 if that makes a difference.
I just noticed the logcat spits out an error when i try to open the app : "Permission Denied: checkComponentPermission() reqUID10064"

You probably need to post the loginActivity in question here so we can see if there are any problems in the activity. Otherwise double check that the loginActivity is in the same package as the other activities, if its not you need to change the ".loginActivity" part of the manifest to its relative location to the main package, aka "somename.loginActivity"

I think the problem is in loginActivity class. May be you check for already loggined user and finish activity in this case?

How to avoid force close on mobile phone orientation change?

my android application crashes and shows force close when i tilt the mobile phone. is there any suggestions that i can remove such problem? By the way i am developing a LBS application which uses the google maps (MapView).
I have a splash screen and then shown a ListActivity as below :
<activity android:name=".Splash" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Home" android:label="#string/app_name" android:configChanges="orientation" android:windowSoftInputMode="stateHidden">
<intent-filter>
<action android:name="com.nepways.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
what is wrong with my declaration, the splash screen loads and list activity is also whown correctly but when i change the orientation the application is closed. Please help me.

When you change your orientation the activity is restarted
look at the logcat to see what exception causes your application to FC
You can change your manifest to disable activity restarting by customizing configChanges, if you stil have the problem override onConfigurationChanged() to fix what is generating this exception (like initialize something that may cause a nullpointer)

First of all as it is said the app is restarting (or as it is said in reference redrawing) each time when you change orientation.
To block it in your manifest file in activity you have to put this line which describes the activity orientation:
<activity android:name=".Splash"
android:label="#string/app_name"
android:screenOrientation="portrait">...
And about this buttons, or keymaps. Telling the truth Ive got thise warnings sometimes but it doesnt change anything in my app. So first change the orientation settings and then it should work correct.
If you want use other screen orientation remember to check here:
http://developer.android.com/guide/topics/manifest/activity-element.html

If you want to avoid restarting your activity on orientation change, you can put this in the activity in the manifest file:
android:configChanges="orientation"
Otherwise, we will need to see more code, and a stacktrace.