Android listens to screen lock/Open events, and android screen lock

Android listens to screen lock/Open events, and android screen lock
1. Two solutions

(1) Listen to BroadcastReceiver

(2) obtain the PowerManager event

2. BroadcastReceiver2.1. event

There are 3 events in total:

Intent. ACTION_SCREEN_ON: Intent. ACTION_SCREEN_OFF: Intent. ACTION_USER_PRESENT: unlocked

2.2. Permission

To unlock a listener, you must register the permission in AndroidManifest.

<uses-permission android:name="android.permission.RECEIVE_USER_PRESENT" />

2.3. IntentFilter code

        if (mContext != null) {            IntentFilter filter = new IntentFilter();            filter.addAction(Intent.ACTION_SCREEN_ON);            filter.addAction(Intent.ACTION_SCREEN_OFF);            filter.addAction(Intent.ACTION_USER_PRESENT);            mContext.registerReceiver(mScreenReceiver, filter);        }

3. PowerManager

        PowerManager manager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);        if (manager.isScreenOn()) {            if (mScreenStateListener != null) {                mScreenStateListener.onScreenOn();            }        } else {            if (mScreenStateListener != null) {                mScreenStateListener.onScreenOff();            }        }

4. Code

Import android. annotation. suppressLint; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android. content. intentFilter; import android. OS. powerManager;/*** Created by xiyanglu on 4/11/15. */public class ScreenObserver {private Context mContext; private ScreenBroadcastReceiver mScreenReceiver; private ScreenStateListener mScreenStateListener; Public ScreenObserver (Context context) {mContext = context; mScreenReceiver = new listener ();} public void startObserver (ScreenStateListener listener) {mScreenStateListener = listener; registerListener (); getScreenState ();} public void shutdownObserver () {unregisterListener ();}/*** get screen status */@ SuppressLint ("NewApi") private void getScreenState () {if (mContext = null) {Return;} PowerManager manager = (PowerManager) mContext. getSystemService (Context. POWER_SERVICE); if (manager. isScreenOn () {if (mScreenStateListener! = Null) {mScreenStateListener. onScreenOn () ;}} else {if (mScreenStateListener! = Null) {mScreenStateListener. onScreenOff () ;}} private void registerListener () {if (mContext! = Null) {IntentFilter filter = new IntentFilter (); filter. addAction (Intent. ACTION_SCREEN_ON); filter. addAction (Intent. ACTION_SCREEN_OFF); filter. addAction (Intent. ACTION_USER_PRESENT); mContext. registerReceiver (mScreenReceiver, filter) ;}} private void unregisterListener () {if (mContext! = Null) mContext. unregisterReceiver (mScreenReceiver);} private class ScreenBroadcastReceiver extends BroadcastReceiver {private String action = null; @ Override public void onReceive (Context context, Intent intent) {action = intent. getAction (); if (Intent. ACTION_SCREEN_ON.equals (action) {// enable mScreenStateListener. onScreenOn ();} else if (Intent. ACTION_SCREEN_OFF.equals (action) {// lock screen mScreenStateListener. onScreenOff ();} else if (Intent. ACTION_USER_PRESENT.equals (action) {// unlock mScreenStateListener. onUserPresent () ;}} public interface ScreenStateListener {// return the screen status information to the caller public void onScreenOn (); public void onScreenOff (); public void onUserPresent ();}}

5. References

[1] Android monitor screen unlock event http://blog.csdn.net/gf771115/article/details/7991892