Argthtjtr

I implemented the Android lock screen app.

An RuntimeException occurred while executing the LockScreenActivity(Regardless of the Android version).
But this Exception is occurs very intermittentl and it is not reported to Crashlytics.

The Exception content is :

2018-11-20 16:09:10.037 7657-7657/hanmo.com.drinkingwaterassistant E/ActivityThread: Performing stop of activity that is already stopped: {hanmo.com.drinkingwaterassistant/hanmo.com.drinkingwaterassistant.lockscreen.LockScreenActivity}

    java.lang.RuntimeException: Performing stop of activity that is already stopped: {hanmo.com.drinkingwaterassistant/hanmo.com.drinkingwaterassistant.lockscreen.LockScreenActivity}

        at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:4200)

        at android.app.ActivityThread.handleStopActivity(ActivityThread.java:4288)

        at android.app.ActivityThread.-wrap25(Unknown Source:0)

        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1730)

        at android.os.Handler.dispatchMessage(Handler.java:105)

        at android.os.Looper.loop(Looper.java:164)

        at android.app.ActivityThread.main(ActivityThread.java:6938)

        at java.lang.reflect.Method.invoke(Native Method)

        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

First, I reproduced this intermittent exception to occur when I wanted to.

The conditions for reproduction are as follows.

• Given : The lock screen Activity is running.


• When : startActivity to transparent activities


• Then : occurs Exception that (performing stop of activity that is already stopped)

Style for transparent activity :

<style name="transparentView" parent="android:Theme.Translucent">

    <item name="windowActionBar">false</item>

    <item name="windowNoTitle">true</item>

    <item name="android:windowBackground">@android:color/transparent</item>

    <item name="android:colorBackgroundCacheHint">@null</item>

    <item name="android:windowIsTranslucent">true</item>

    <item name="android:windowAnimationStyle">@android:style/Animation</item>

    <item name="android:windowNoTitle">true</item>

    <item name="android:windowContentOverlay">@null</item>

    <item name="android:backgroundDimEnabled">false</item>

</style>

Occurs when transparent Activity appeared on the lockScreenActivity.

So I made a non-transparent lockScreenActivity. However, Exception persisted intermittently.

I want to know the cause of this Exception.

Here are my suspicious parts of LockScreenActivity.

Manifest

<activity android:name=".lockscreen.LockScreenActivity"

        android:showOnLockScreen="true"

        android:launchMode="singleInstance" />

onWindowFocusChanged in LockScreenActivity

override fun onWindowFocusChanged(hasFocus: Boolean) {

        super.onWindowFocusChanged(hasFocus)

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

            if (hasFocus) window.decorView.systemUiVisibility = (

                    View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

                            or View.SYSTEM_UI_FLAG_LAYOUT_STABLE

                            or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY

                            or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

                    )

        }

    }

onAttachedToWindow in LockScreenActivity

override fun onAttachedToWindow() {

        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON

                or WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD

                or WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED

        )



        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

        super.onAttachedToWindow()

    }

Admob in LockScreenActivity

<com.google.android.gms.ads.AdView

            android:id="@+id/adView"

            android:layout_width="match_parent"

            android:layout_height="0dp"

            android:background="@drawable/transparent"

            app:adSize="SMART_BANNER"

            app:adUnitId="@string/admobBanner"

            app:layout_constraintBottom_toBottomOf="parent"

            app:layout_constraintEnd_toEndOf="parent"

            app:layout_constraintHorizontal_bias="1.0"

            app:layout_constraintStart_toStartOf="parent" />

And My LockScreenActivity Example is here