CODEWITHSUNDEEP
androidaccessibilityservice
FlappySocks
FlappySocks

Reputation: 3880

AccessibilityService OnKeyEvent with screen off

I'm using AccessibilityService OnKeyEvent to capture the Headsethook. This is so I can trigger an event on key up, and key down, even if my app it not in focus.

However, it does not work once the screen goes off. Is there any way around this?

Upvotes: 3

Views: 1907

Answers (1)

CrazyBoyFeng
CrazyBoyFeng

Reputation: 41

AccessibilityService will not work when the screen is off. so to achieve the effort that catch KeyEvent when power down, You should use other alternatives.

if you only want to catch HEADSETHOOK, you can use MediaButtonIntentReceiver instead of AccessibilityService: register a BroadcastReceiver to receive ACTION_MEDIA_BUTTON intent, so can catch KEYCODE_MEDIA_* and KEYCODE_HEADSETHOOK in background, also as the screen is off.

AndroidManifest.xml

<receiver android:name="com.exmaple.MediaButtonReceiver"><intent-filter >
    <action android:name="android.intent.action.MEDIA_BUTTON"></action>  
</intent-filter></receiver>

MediaButtonReceiver.java

...
public void onReceive(Context context, Intent intent) {
    ...
    KeyEvent keyEvent = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
    if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
        int keyCode = keyEvent.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_HEADSETHOOK:
            ...
        }
    }
    ...
}

if you do not want the other app to catch HEADSETHOOK, you should use AudioManager to register it:

...
AudioManager mAudioManager =(AudioManager)getSystemService(Context.AUDIO_SERVICE);
ComponentName  mbCN = new ComponentName(getPackageName(),MediaButtonIntentReceiver.class.getName());  
mAudioManager.registerMediaButtonEventReceiver(mbCN);
... 
//mAudioManager.unregisterMediaButtonEventReceiver(mbCN);
...

note: most music player apps also use MediaButton, when they register MediaButton receiver, your app will lose the focus of AudioManager, so you maybe should use AudioFocusChangeListener to listen the focus change and re-register.

if you also want to capture other keys in background. as far as i know, root is an all-right solution. you can use getevent command to catch all the log stream of input devices. then trigger the log of wanted keys.

Upvotes: 3

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