Develop Reference

Prevent app from returning to BootActivity when Home is pressed on the navigation bar

I am building an Android application that launches 3rd party applications - both of which run in full screen.
When the 3rd party application is launched, if i swipe up from the bottom, i see the Android navigation bar (good) - however, if i then press the Android Home button on this nav bar, the 3rd party application exits (good), but my application is returned to the main boot activity and not the activity from which i launched the application from.
My application manifest contains..
<activity android:name=".boot.BootActivity"
android:configChanges="keyboardHidden|locale|layoutDirection"
android:excludeFromRecents="true"
android:label="#string/app_name"
android:launchMode="singleTask"
android:screenOrientation="landscape"
android:windowSoftInputMode="stateAlwaysHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.HOME" />
</intent-filter>
</activity>
<activity android:name=".main.MainActivity"
android:configChanges="keyboardHidden|locale|layoutDirection"
android:label="#string/title_activity_main"
android:launchMode="singleTask"
android:screenOrientation="landscape"
android:windowSoftInputMode="stateAlwaysHidden" />
The BootActivity performs a bunch of pre-loading and model generation before waiting for the user to select a button which starts loading MainActivity which displays the menus and synopsis for the 3rd party apps.
When 3rd party is launched, we swipe up and press Home on the Android nav bar, the logcat is getting both "android.intent.action.MAIN" and "android.intent.category.HOME".
As mentioned above, this is causing the app to return to the boot activity - but i would like the 3rd party app to exit and return to the apps synopsis in MainActivity.
Can intent-filters be added, removed or temporarily disabled programmatically?

Generally using these special launch modes (singleTask) is a bad idea. If your BootActivity is launching HomeActivity, then this will not run in a new task, even though the launch mode would imply that, because these activities both have the same taskAffinity. If you really want to have them run in different tasks, then you need to set the taskAffinity of one or the other (or both) so that they are not the same. Read a bit about how taskAffinity works.

Android deep links opens in the app I linked from instead of launching a separate instance of my app

I am using react-native. Deep linking is working great for ios. For Android however, I can't seem to figure out how to open my app properly from deep links.
When opening a deep link from e.g. Firefox, my app is launched inside the firefox window. It is the same when I use a deep link-tester app. Everything works as intended with the app with the exception that it is not launched from the proper app.
What am I doing wrong? Here is an excerpt from my AndroidManifest.xml:
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:configChanges=
"keyboard|keyboardHidden|orientation|screenSize"
android:windowSoftInputMode="adjustResize"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="myapp" />
</intent-filter>
</activity>

Take a look at https://developer.android.com/guide/components/activities/tasks-and-back-stack
When declaring an activity in your manifest file, you can specify how the activity should associate with a task using the element's launchMode attribute.
The launchMode attribute specifies an instruction on how the activity should be launched into a task. There are four different launch modes you can assign to the launchMode attribute:
Try putting android:launchMode="singleTask" on your activity tag
The system creates a new task and instantiates the activity at the root of the new task. However, if an instance of the activity already exists in a separate task, the system routes the intent to the existing instance through a call to its onNewIntent() method, rather than creating a new instance. Only one instance of the activity can exist at a time.
https://developer.android.com/guide/components/activities/tasks-and-back-stack#ManifestForTasks
Further background reading includes (and many other things you can try):
FLAG_ACTIVITY_NEW_TASK clarification needed
Android Task Affinity Explanation

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);

Android - Custom Home Application Doesn't Appear When Click Home Button

I'am using Android Studio and I have developed an Home Application by adding
<activity
android:windowSoftInputMode="stateAlwaysHidden"
android:screenOrientation="landscape"
android:launchMode="singleInstance"
android:stateNotNeeded="true"
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.MONKEY"/>
</intent-filter>
</activity>
This is working and I am testing my application with run button no problem.
But after run another app from Android Studio the home application stop appearing home button selection screen.(not everytime). This is how I solve my problem
I create another application
Move files and codes to new created project.
Then my code is working with different name
This looks like a bug, I dont know what is that. Is there a way to clear cache data or another simple way to solve the problem or any suggestion?

You most likely have a different launcher set as default launcher.
In the settings of your device you should be able to set the default launcher.
Go to applications and look for your current launcher. Clear the default launcher.
If you cleared the default launcher and correctly installed your launcher, it should now ask every time which launcher to launch when you hit the home button.
Tip: Try it out on different devices and emulators!

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!