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How To Know If Users Entered A Wrong Passcode (lock Screen) In Android App

I am working on an Android App in which one of the activity has to be completed if user enter a wrong passcode in android lock screen. For example an email sent if user entered a w

Solution 1:

The lock screen are running in a total sandbox environment which makes it makes it inaccessible.You can create a different Application acting as the lock screen and disabling the default android version.


Solution 2:

You can do this by registering your app as Device Administrator.
Add watch-login tag to device admin metadata and then you will be able to handle onPasswordFailed and onPasswordSucceeded events.
create a file named device_admin.xml in your res/xml folder and put these tags inside it:

<?xml version="1.0" encoding="utf-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-policies>
        <watch-login />
    </uses-policies>
</device-admin>  

then you need to create a AdminReciever class that extends from DeviceAdminReceiver. inside this class you can handle onPasswordFailed and do what you need if user entered incorrect password. you can see full example here:
Password Enforcer Sample
NOTE
as far as i know, this works only with Password and PIN and Patterns is not supported.


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