Develop Reference

Two Instances opened When opening application from dynamicaLink and from launcher icon?

I ran into an issue in my Android Application where whenever I open my app through a dynamic link shared on Whatsapp, it will open in the same Whatsapp Application. I can see by going to the recent task that there is only one Application in a recent task which is Whatsapp and I can see my application inside it.
If I open my app from launcher icon then it will also create a new Application and there will be two application in recent tasks. My Splashscreen looks like this -
<activity
android:name=".SplashScreen"
android:screenOrientation="portrait"
android:theme="#style/SplashTheme"
android:windowSoftInputMode="stateAlwaysHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

You should added attribute in your activity
android:launchMode="singleTask"

In general it is better to use a dedicated Activity for sharing from other applications. Another app should not launch your main (root) Activity to share, it should launch a different Activity. That Activity can then launch your main (root) Activity in a new task (if necessary). You need to consider the user's behaviour and make sure that you don't confuse the user with multiple tasks.

Need to Hide information in an activity or a fragment when app running in background

i am using one app, for example chrome with some confidential information and i am switching it to background & i am trying to kill the app.
i uploaded the example image when trying to kill the app. even the session the expired it won't close the information in the killing stage when app comes foreground then only it closes the information. i want the info should be closed or hided when it goes background (In killing stage).
i searched in google i am not getting anything related to this and i don't know whether my search phrase is correct. can anyone pleas help me.

I think ur asking this:
Just add this in manifest file:
android:excludeFromRecents="true"
Example:
<activity
android:name=".MainActivity"
android:excludeFromRecents="true"
android:taskAffinity=".OnInviteActivity"
android:noHistory="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>
then your app will not show in background or recent app or in menu like that
UPDATE:
for ur app name only u need to add this in Main Activity:
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);

Restoring Unity3d Android application with another activity on top

I need the following problem to be resolved:
From the UnityPlayerNativeActivity I am starting a standard Android activity (may be mine, may be with an ad from the ad network - nevermind). When the game is being hidden with this activity on top (not the Unity one) by pressing the home button, as a user I have two ways of restoring it:
from the Recently used apps screen - the app is being restored to the same state, when it was minimized (that is what I expect to happen);
from the launcher, what causes the game's UnityPlayerNativeActivity is being restored with losing all other activities, that have been opened on top of it.
These activities are lost somehow (in a way I don't exactly know, what has happened with them). My game's logic depends on the result of the processes happening there, ie. I need to know, that this particular activity has been exited in any specific way (give a callback for example).
Do you know how I can bring this Unity activity back from launcher with all activities above it, as it was while minimizing it?
I want to understand the difference between the ways of restoring the app from Recently used screen and the launcher. I guess it is related to the intent-filter section within AndroidManifest.xml file, which is included within UnityPlayerNativeActivity entry.

The solution turned out to be quite simple, but not so obvious.
It has turned out, that the AndroidManifest.xml configuration that is being produced by Unity by default is causing this problem. For the main activity that is being started from launcher the following parameters are defined (taken from decompiled app):
<activity
android:alwaysRetainTaskState="true"
android:clearTaskOnLaunch="true"
android:configChanges="locale|fontScale|keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|touchscreen|uiMode"
android:label="#string/app_name"
android:launchMode="singleTask"
android:name="com.unity3d.player.UnityPlayerNativeActivity"
android:screenOrientation="fullSensor"
launchMode="singleTask">
<meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true"/>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
<category android:name="android.intent.category.LEANBACK_LAUNCHER"/>
</intent-filter>
</activity>
The problematic behaviour is being caused by these 2 parameters:
android:clearTaskOnLaunch="true"
android:launchMode="singleTask"
When the I change them to:
android:clearTaskOnLaunch="false"
android:launchMode="standard"
Then the app is resuming fine from the launcher.
The correct parameters should be set as follows:
<activity
android:alwaysRetainTaskState="true"
android:clearTaskOnLaunch="false"
android:configChanges="locale|fontScale|keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|touchscreen|uiMode"
android:label="#string/app_name"
android:launchMode="standard"
android:name="com.unity3d.player.UnityPlayerNativeActivity"
android:screenOrientation="fullSensor"
launchMode="standard">
<meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true"/>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
<category android:name="android.intent.category.LEANBACK_LAUNCHER"/>
</intent-filter>
</activity>
Note: While I am able to set the value android:clearTaskOnLaunch="false" for this activity explicitly, the launchMode parameter will be forced by Unity3d and set to "singleTask". I managed to change and check it by decompiling the app and rebuilding from these changed resources. I wonder if there is any elegant way to set this value.

You may find this blog post useful:
http://inthecheesefactory.com/blog/understand-android-activity-launchmode/en

Change application's name without touching the default activity

I have an Android application with a default activity which is defined in the AndroidManifest.xml:
<application
android:label="NameOfMyApp"
...
<activity
android:name=".LoginActivity"
android:label="Login">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.rei0d.wop.MainActivity" />
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
It seems that android:label="NameOfMyApp" will be overwritten if there is an attribut android:label for the default activity.
So I want to change the application's name to something else than Login, NameOfMyApp for example, without changing the android:label of the Login activity. Is this possible? Or do I have to create a blanc activity as default activity which starts the Login activity?

Well, there are multiple possibilities to fix this issue, unfortunately some of them don’t work on all devices.
It seems like that the Launcher takes the application-name from the label of the "Entry Activity". You can prevent his by adding the following attribute to your intent-filer:
<intent-filter android:label="NameOfMyApp">
Unfortunately some Launchers may ignore this, so I wouldn’t go for this solution.
I would recommend you to change the title of your Login-Activity programatically. So first of all change the android:label value of your .LoginActivity to the name of your app.
In onCreate or somewhere else set the title (assuming that you’re using the ActionBar).
getActionBar().setTitle("Login");
Note: You should get the title from a strings-xml file of course

Change Android App starting activity

I'm trying to change the start up activity.
I created an activity when the app loads but I want to add a screen before that, I'm not sure where to change the Android manifest to load a certain layout/activity when the app starts.

The startup activity [Launcher Activity] is declared in the projects' AndroidManifest.xml file
Look for that activity tag in the manifest which looks like this
<activity android:name=".Main"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Look at the attribute android:name. Main is the class which is launched when the app starts. Currently your calendar activity name should be there. Change that to the .classpath of your activity that you want to launch.
That should do it. You may also want to do the hello world application in the tutorials and go through the docs a little to see how Android Applications work.
From here

Just create another activity and set it as Launcher Activity and after a timer (if that's your achieve) just call the other activity!