android unlock screen intent?

Question

Is there an intent that is fired when a user unlocks their screen? I want my app to adjust the brightness when the screen turns on, but the problem im running into is that

Answer 1

Add the receiver in menifest file

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

Create a broadcast receiver which works to open app when phone is unlocked.

public class ScreenReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        System.out.println(intent.getAction());
        if (intent.getAction().equals(Intent.ACTION_USER_PRESENT))
        {
            Intent intent1 = new Intent(context,MainActivity.class); 
            intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        
            context.startActivity(intent1);
        }
    }

I'm sure it will work.

Answer 2

Look at the disableKeyguard method in the KeyguardLock class.

Answer 3

Yes, the ACTION_USER_PRESENT is broadcasted after the user unlocks:

http://developer.android.com/reference/android/content/Intent.html#ACTION_USER_PRESENT

Note that this is a protected broadcast and if the user is using a lock screen replacement such as WidgetLocker or NoLock the USER_PRESENT may not be sent or may be sent at the wrong time.

For detecting WidgetLocker's unlock see: http://teslacoilsw.com/widgetlocker/developers