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.

Answer 1

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");       }    }