How to Lock Unlock screen programmatically

Question

I am doing an application which Locks the screen on shake. Now it is locking and from there it going to a broadcast receiver from there if the screen is off its entering into a service which has to turn the screen on.

Below is the broadcast receiver:

  public class ScreenReceiver extends BroadcastReceiver {   
    public static boolean wasScreenOn = true;
    @Override
    public void onReceive(Context context, Intent intent) {

        System.out.println("Entered Broadcaste Reciever");

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            // DO WHATEVER YOU NEED TO DO HERE
             System.out.println("SCREEN_OFF"+wasScreenOn);
            wasScreenOn = false;

            Intent i = new Intent(context, UpdateService.class);
            i.putExtra("screen_state", wasScreenOn);
            context.startService(i);

            System.out.println("jrkejhr keh");
        }
        else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            // AND DO WHATEVER YOU NEED TO DO HERE
            wasScreenOn = true;
            System.out.println("SCREEN_ON"+wasScreenOn);
        }
    }

And its entering to a service where i had written the intent action to go home is...

  ShakeListener mShaker;
    int amountOfTime = 0;
    Context context1;   
    @Override   
         public void onCreate() {

            super.onCreate();

            // REGISTER RECEIVER THAT HANDLES SCREEN ON AND SCREEN OFF LOGIC
            System.out.println("Enterd Service");
            final Vibrator vibe = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);

            mShaker = new ShakeListener(this);
            mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
              public void onShake() {
                vibe.vibrate(100);
                Intent goHome = new Intent();
                goHome.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                goHome.setAction("android.intent.action.MAIN");
                goHome.addCategory("android.intent.category.HOME");
                startActivity(goHome);                      
               }
            });
         }
       @Override
        public IBinder onBind(Intent intent) {
            // TODO Auto-generated method stub
            return null;
     }

It is entering into the service. But home screen is not displaying. When the service is invoked the the screen is locked.

User · Answer

Use Activity getWindow   to get the window of your activity  use Window addFlags   to add whichever of the following flags in WindowManager LayoutParams that you desire     FLAG DISMISS KEYGUARD FLAG SHOW WHEN LOCKED FLAG TURN SCREEN ON

User · Answer

Edit   As some folks needs help in Unlocking device after locking programmatically  I came through post Android screen lock  unlock programatically  please have look  may help you    Original Answer was   You need to get Admin permission and you can lock phone screen  please check below simple tutorial to achive this one  Lock Phone Screen Programmtically   also here is the code example    LockScreenActivity java  public class LockScreenActivity extends Activity implements OnClickListener      private Button lock     private Button disable     private Button enable     static final int RESULT ENABLE   1          DevicePolicyManager deviceManger         ActivityManager activityManager         ComponentName compName          Override       public void onCreate Bundle savedInstanceState              super onCreate savedInstanceState             setContentView R layout main              deviceManger    DevicePolicyManager getSystemService              Context DEVICE POLICY SERVICE             activityManager    ActivityManager getSystemService              Context ACTIVITY SERVICE             compName   new ComponentName this  MyAdmin class              setContentView R layout main              lock   Button findViewById R id lock             lock setOnClickListener this              disable    Button findViewById R id btnDisable             enable   Button findViewById R id btnEnable             disable setOnClickListener this             enable setOnClickListener this                Override    public void onClick View v         if v    lock         boolean active   deviceManger isAdminActive compName                  if  active                       deviceManger lockNow                                if v    enable        Intent intent   new Intent DevicePolicyManager         ACTION ADD DEVICE ADMIN                 intent putExtra DevicePolicyManager EXTRA DEVICE ADMIN                        compName                 intent putExtra DevicePolicyManager EXTRA ADD EXPLANATION                         Additional text explaining why this needs to be added                   startActivityForResult intent  RESULT ENABLE              if v    disable          deviceManger removeActiveAdmin compName                   updateButtonStates                     private void updateButtonStates                boolean active   deviceManger isAdminActive compName             if  active                  enable setEnabled false                 disable setEnabled true                else                 enable setEnabled true                 disable setEnabled false                             protected void onActivityResult int requestCode  int resultCode  Intent data               switch  requestCode                   case RESULT ENABLE                     if  resultCode    Activity RESULT OK                           Log i  DeviceAdminSample    Admin enabled                          else                          Log i  DeviceAdminSample    Admin enable FAILED                                             return                          super onActivityResult requestCode  resultCode  data                  MyAdmin java  public class MyAdmin extends DeviceAdminReceiver          static SharedPreferences getSamplePreferences Context context              return context getSharedPreferences              DeviceAdminReceiver class getName    0                  static String PREF PASSWORD QUALITY    password quality         static String PREF PASSWORD LENGTH    password length         static String PREF MAX FAILED PW    max failed pw          void showToast Context context  CharSequence msg              Toast makeText context  msg  Toast LENGTH SHORT  show                    Override       public void onEnabled Context context  Intent intent              showToast context   Sample Device Admin  enabled                    Override       public CharSequence onDisableRequested Context context  Intent intent              return  This is an optional message to warn the user about disabling                    Override       public void onDisabled Context context  Intent intent              showToast context   Sample Device Admin  disabled                    Override       public void onPasswordChanged Context context  Intent intent              showToast context   Sample Device Admin  pw changed                    Override       public void onPasswordFailed Context context  Intent intent              showToast context   Sample Device Admin  pw failed                    Override       public void onPasswordSucceeded Context context  Intent intent              showToast context   Sample Device Admin  pw succeeded

User · Answer

The androidmanifest xml and policies xml files on the sample page are invisible in my browser due to it trying to format the XML files as HTML   I m only posting this for reference for the convenience of others  this is sourced from the sample page     Thanks all for this helpful question   AndroidManifest xml    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android        package  com kns        android versionCode  1        android versionName  1 0  gt       lt uses-sdk android minSdkVersion  8    gt        lt application android icon   drawable icon  android label   string app name  gt           lt activity android name   LockScreenActivity                    android label   string app name  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                   lt category android name  android intent category LAUNCHER    gt               lt  intent-filter gt           lt  activity gt            lt receiver android name   MyAdmin                  android permission  android permission BIND DEVICE ADMIN  gt               lt meta-data android name  android app device admin                         android resource   xml policies    gt               lt intent-filter gt                   lt action android name  android app action DEVICE ADMIN ENABLED    gt               lt  intent-filter gt           lt  receiver gt        lt  application gt   lt  manifest gt    policies xml   lt  xml version  1 0  encoding  utf-8   gt   lt device-admin xmlns android  http   schemas android com apk res android  gt       lt uses-policies gt           lt limit-password   gt           lt watch-login   gt           lt reset-password   gt           lt force-lock   gt           lt wipe-data   gt       lt  uses-policies gt   lt  device-admin gt

[android] How to Lock/Unlock screen programmatically?

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