InputDispatcher: Dropped event because input dispatch is disabled

问题

I am developing ui automation platform for android.

For some reason sometimes (very rare) click events can be dropped

When it happen I see in log

I/InputDispatcher( 2707): Dropped event because input dispatch is disabled.

Please advise what can be done to enable input dispatch.

Thank you in advance

回答1:

There are certain conditions in which Input Dispatcher will drop the input events:

DROP_REASON_BLOCKED : If current application is not responding and user is tapping on device, input event will be dropped
DROP_REASON_STALE: Dropped event because it is stale
DROP_REASON_APP_SWITCH: Dropped event because of pending overdue app switch
DROP_REASON_DISABLED: Dropped event because input dispatch is disabled

etc.

In your case, its executing case 4. Means something going fishy or your first input is not executed yet. So Input Dispatcher is disabled.

Check [method dropInboundEventLocked of middleware class InputDispatcher.cpp

回答2:

It happened only when screen was off. Click event was turning screen on, but it event was quicker than turning screen on.

Now, I am checking if screen is off and turning it on

//Acquire wake lock in case screen is off
if (PermissionsUtil.checkSelfPermission(getContext(), Manifest.permission.WAKE_LOCK))
{
    PowerManager pm = (PowerManager)getContext().getSystemService(Context.POWER_SERVICE);
    if (pm.isScreenOn() == false)
    {
        wakeLock = pm.newWakeLock((PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP), TAG);
        // 
        wakeLock.acquire();
        Log.d(TAG,"Acquiring wake lock");
     }
}

//Do my stuff

//Release wake lock in case it was acquire
if (wakeLock != null && wakeLock.isHeld())
{
    wakeLock.release();
    wakeLock = null;
    Log.d(TAG,"Releasing wake lock");
}

来源：https://stackoverflow.com/questions/11774771/inputdispatcher-dropped-event-because-input-dispatch-is-disabled

标签

android

ui-automation

dispatch