A Way to Get Unlock Event in Android

A way to get unlock event in android?

There is a Broadcast Receiver Action ACTION_USER_PRESENT here is the implementation of ACTION_USER_PRESENT and ACTION_SHUTDOWN

add this to your application Manifests

<receiver android:name=".UserPresentBroadcastReceiver">
  <intent-filter>
    <action android:name="android.intent.action.USER_PRESENT" />
    <action android:name="android.intent.action.ACTION_SHUTDOWN" />
 </intent-filter>
</receiver>

to receive the actions

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class UserPresentBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context arg0, Intent intent) {

        /*Sent when the user is present after 
         * device wakes up (e.g when the keyguard is gone)
         * */
        if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)){

        }
        /*Device is shutting down. This is broadcast when the device 
         * is being shut down (completely turned off, not sleeping)
         * */
        else if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {

        }
    }

}

UPDATE:

As part of the Android 8.0 (API level 26) Background Execution Limits, apps that target the API level 26 or higher can no longer register broadcast receivers for implicit broadcasts in their manifest.
see

Detect screen unlock

As far as I know, there is no need to add anything to manifest if I choose to use registerReceiver, right?

Wrong. The advantage of an registered receiver in the manifest is the fact that it does not require your app to be running when the Intent is fired.

So your app probably is not active when the user unlocks the screen so there is no registerReceiver() called and therefore your receiver does not react.

Add the receiver in your manifest and it will work.

How to detect and control the phone lock/unlock on android?

You may want to have a look on Device Policy Manager and Device Admin tutorial. You can lock the screen by a simple sample of code like:

DevicePolicyManager dpm = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);  
dpm.lockNow();

For the detection, you can follow this tutorial http://chandan-tech.blogspot.fr/2010/10/handling-screen-lock-unlock-in-android.html, it's very clear.

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