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How to ask for the permission to become Default Video Player in Android?

I am developing a video player app and I want my app to Prompt for the permission to be the default Video Player to be the default handler of video play.
I know it has to be something like the default handler:
Intent setSmsAppIntent =
new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);
setSmsAppIntent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME,
getPackageName());
startActivityForResult(setSmsAppIntent, your-result-code);`
source: Android Docs
But I don't know the Action I have to give to the Intent as action. Can someone please help me?
Thanks in advance.

It's not possible, developers can't call intent to change default Video player only users can do that on their device. Its only possible for SMS service.
However, for video player you can register app for video player in AndroidManifest.xml and call the function which opens settings to change default apps using the following code:
Intent intent = new Intent(Settings.ACTION_MANAGE_DEFAULT_APPS_SETTINGS);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

how to force alert Yes No when Bluetooth Activated?

I'm sure you all know that if you run the below code under any android.
It will enable your Bluetooth. But first, it will show you an alert showing a dialog Yes/No.
Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);
My question is quite simple.
How to force Yes selection on that dialog?
My purpose is to programatically force enabling the bluetooth, and any other alert Yes/No.
So the user no need to see Yes/No. They will use Yes only. no dialog.
Please share a bit of guide. Thanks.

You can try to enable BluetoothAdapter (more info) like this:
BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();
mAdapter.enable()
It requires the BLUETOOTH_ADMIN permission

How to redirect User from Gallery TO my application in ANdroid?

When user taps gallery button I want user to redirect to my application's activity which will ask the user to enter password and then redirect user back to gallery ..
I want to know which permissions should i use and which broadcast should i accept .

Well If you want to lock the gallery you can do it in encrypt Decrypt way...
You can use MediaStore to access the images and then encrypt using your application and when user Again want to access that you can allow him to show by decrypting ...
Read the following link
Can I create password protected folder in Android?

You would need to replace the gallery application entirely to do what you're proposing.
When a user taps the Gallery icon, it doesn't fire a broadcast. It sends a directed intent with the action set to MAIN.
Anything that anyone tells you for how to do this is going to be wrong. You cannot do it.
The closest you could get is to use the MediaStore in your own app to access the same images that the gallery accesses.

Start a thread from your app which should periodically monitor foreground app name which in this case should be the Gallery (I cant remember the exact name But you can find it out using below logic).
Then if it is Gallery, open up your activity by blocking it.
If password success close activity & background will be the Gellery or otherwise redirect to Home.
For monitor foreground app
try {
ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTasks = activityManager.getRunningTasks(1);
PackageManager pm = getApplicationContext().getPackageManager();
output1 = pm.getApplicationLabel(pm.getApplicationInfo(runningTasks.get(0).baseActivity.getPackageName(),PackageManager.GET_META_DATA)).toString();
String className = runningTasks.get(0).topActivity.getClassName();
if( className.contains("Gallery")) {
//better to create this object globally outside the thread.
Intent intentSettingLock = new Intent();
intentSettingLock.setClass(oContext,SettingsLockNew.class);
intentSettingLock.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
oContext.startActivity(intentSettingLock);
}
}
catch(Exception e) {
}
To redirect to home on invalid password
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);
this.finish();

You can not perform this as you described because pressing the gallery app icon from the launcher the system fires an intent with action=MAIN and category=LAUNCHER for the specific application package.
Since you cannot name your application package as the gallery package name you cant filter this intent.

Bring app in background to front

I am making an app that gives an alarm when you are close to a gps position. now when a user presses the home button this app get send to the back. When the users enters the region to trigger the alarm, the alarm triggers but the app isn't send to the foreground.
How can i do this?
I tried this
Intent intent = new Intent(context, TrainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(intent);
in the function of the alarm, but this does nothing? (Trainactivity is the class that runs on the background and the class that needs to be on the foreground)

The REORDER_TO_FRONT flag only controls the stacking order on the activity history. That is not what you want. Is this what you are looking for ? - Bring application to front after user clicks on home button

Android: How to close application opened from my app when all sent to background

Here is my problem. I am developing app that loads some documents from server. I open document in another app via Intent.ACTION_VIEW. This is all working just fine. Problem is that whole app is pin protected so I have to capture events such "sent to background" or "screen lock" to bring up pin screen afterwards and this is not working when another app is opened above mine. So if user opens document then press home button, click on my launch icon from menu then he gets again external app with opened document and with back button access my app again. This is security issue that needs to be fixed.
Here are some code snippets:
Opening document:
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.fromFile(downloadedFile);
String mimeType = document.getMimeType();
intent.setDataAndType(uri, mimeType);
startActivityForResult(intent, 1);
capture sent to background:
ActivityManager am = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> tasks = am.getRunningTasks(1);
if (!tasks.isEmpty()) {
ComponentName topActivity = tasks.get(0).topActivity;
if (!topActivity.getPackageName().equals(context.getPackageName())) {
IN_BACKGROUND = true;
Log.i(PinUtil.class.getSimpleName(), "App sent to background ");
} else {
IN_BACKGROUND = false;
}
}
My question is: Is it possible to detect if my app is sent to background when another app is opened? How not to open another app when my launcher icon is pressed.
Thanks for all responses.
Regards
Lubos

In order to fix this problem:
So if user opens document then press home button, click on my launch
icon from menu then he gets again external app with opened document
and with back button access my app again. This is security issue that
needs to be fixed. Here are some code snippets:
You need to make sure that, when you launch an external app for the user to view a document, that the external app does not run in the same task as your application. It needs to run in a new, separate task. You can do this like this:
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // Ensure app runs in separate task
Uri uri = Uri.fromFile(downloadedFile);
String mimeType = document.getMimeType();
intent.setDataAndType(uri, mimeType);
startActivity(intent); // Can't use startActivityForResult() here
However, you can't use startActivityForResult() when you launch the external viewer, because an activity running in another task cannot return a result to you. However, most external applications won't return a result when launched with ACTION_VIEW anyway, so it probably isn't a problem.
Then you asked this:
My question is: Is it possible to detect if my app is sent to
background when another app is opened? How not to open another app
when my launcher icon is pressed.
There should be some answers on StackOverflow that can help you determine if your application is in the background (it isn't actually that easy to determine this).
My explanation above should answer your 2nd question. If you don't launch other apps in your task, then only your app will be launched when your launcher icon is pressed.