Android: How to Turn Screen on and Off Programmatically

Turn screen off programmatically

If your app is a device admin you can lock the screen with DevicePolicyManager.lockNow()

You can use this snippet (after setting the Device Admin part):

DevicePolicyManager manager = ((DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE));
manager.lockNow();

Lock or turn off the screen programmatically

Well something with high necessity can't finished with two lines of code, lock off screen required device admin. you may follow this :

private void lock() {
    PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
    if (pm.isScreenOn()) {
        DevicePolicyManager policy = (DevicePolicyManager)
                getSystemService(Context.DEVICE_POLICY_SERVICE);
        try {
            policy.lockNow();
        } catch (SecurityException ex) {
            Toast.makeText(
                    this, 
                    "must enable device administrator",
                    Toast.LENGTH_LONG).show();
                ComponentName admin = new ComponentName(context, AdminReceiver.class);
                Intent intent = new Intent(
                    DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN).putExtra(
                        DevicePolicyManager.EXTRA_DEVICE_ADMIN, admin);
                context.startActivity(intent);
        }           
    }
}

and AdminReceiverClass:

public class AdminReceiver extends DeviceAdminReceiver {
    public static final String ACTION_DISABLED = "device_admin_action_disabled";
    public static final String ACTION_ENABLED = "device_admin_action_enabled";

    @Override
    public void onDisabled(Context context, Intent intent) {
        super.onDisabled(context, intent);
        LocalBroadcastManager.getInstance(context).sendBroadcast(
            new Intent(ACTION_DISABLED));
    }
    @Override
    public void onEnabled(Context context, Intent intent) {
        super.onEnabled(context, intent);
        LocalBroadcastManager.getInstance(context).sendBroadcast(
            new Intent(ACTION_ENABLED));
    }
}

also we need declares the security policies used in metadata so for examples with Path android:resource="@xml/device_admin_sample" :

 <device-admin xmlns:android="http://schemas.android.com/apk/res/android">
  <uses-policies>
    <limit-password />
    <watch-login />
    <reset-password />
    <force-lock />
    <wipe-data />
    <expire-password />
    <encrypted-storage />
    <disable-camera />
  </uses-policies>
</device-admin>

in our case we just need :

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

Now declare it in our manifist.xml :

<receiver
        android:name=".AdminReceiver"
        android:label="@string/device_admin"
        android:description="@string/device_admin_description"
        android:permission="android.permission.BIND_DEVICE_ADMIN">
        <meta-data
            android:name="android.app.device_admin"
            android:resource="@xml/device_admin_sample" />
        <intent-filter>
            <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
        </intent-filter>
    </receiver>`

Hope it will Help you.

Turn off the mobile screen in Android programming

You may find this useful https://developer.android.com/guide/topics/sensors/sensors_position.html

In the link the related program code you may want to look into is

@Override 
protected void onResume() {
// Register a listener for the sensor.
super.onResume();
mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);

}

This might also be a repeated stackoverflow post to: Turn off screen programmatically when face is close the screen on Android

Hope this helps!

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