OnActivityResult not called if not requesting permissions












0















My app is starting an activity from another package with startActivityForResult. I observed problems when my launching activity gets recreated and saw that onActivityResult is not called in that case after the started activity returns. (It is called correctly if I do not trigger activity recreation.)



These are the steps I performed:




  • Start my activity

  • Click my button which calls startActivityForResult on the ykDroid app

  • Bring my app to background. This causes my activity to be destroyed as I have enabled this in the Android developer settings

  • Bring my app back to foreground (I see OnCreate is called)

  • Swipe a Yubikey NEO which causes the other activity to return.

  • Watch logcat to see that OnActivityResult is not called.


I found out that if I call RequestPermissions for Permission.UseFingerprint I get the OnActivityResult callback even after activity recreation. I don't have a clue why. Can anybody explain this behavior?
Could it be related to ykDroid? see https://github.com/pp3345/ykDroid for their source code.



Here is what I used for testing (Xamarin Android):



[Activity(Label = "@string/app_name", Theme = "@style/MyTheme")]
public class DatabaseSettingsActivity : Activity
{

protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.yubichall_test);

FindViewById<Button>(Resource.Id.btn_yubichall).Click += (sender, args) =>
{

byte challenge64 = new byte[64];
for (int i = 0; i < 64; i++)
{
challenge64[i] = (byte) i;


}
var chalIntent = TryGetYubichallengeIntentOrPrompt(challenge64, true);

StartActivityForResult(chalIntent, 123);

};


//Uncomment this and it will work
/* if ((int)Build.VERSION.SdkInt >= 23)
RequestPermissions(new { Manifest.Permission.UseFingerprint }, 99);*/
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Kp2aLog.Log("OnActivityResult: " + requestCode);
if (resultCode == Result.Ok)
{
byte challengeResponse = data.GetByteArrayExtra("response");
if ((challengeResponse != null) && (challengeResponse.Length > 0))
{
FindViewById<TextView>(Resource.Id.text_result).Text =
MemUtil.ByteArrayToHexString(challengeResponse);

}
}
}


public Intent TryGetYubichallengeIntentOrPrompt(byte challenge, bool promptToInstall)
{
Intent chalIntent = new Intent("net.pp3345.ykdroid.intent.action.CHALLENGE_RESPONSE");
chalIntent.PutExtra("challenge", challenge);

IList<ResolveInfo> activities = PackageManager.QueryIntentActivities(chalIntent, 0);
bool isIntentSafe = activities.Count > 0;
if (isIntentSafe)
{
return chalIntent;
}
if (promptToInstall)
{
//please install https://play.google.com/store/apps/details?id=net.pp3345.ykdroid&hl=en
}
return null;
}
}


where the layout yubicall_test is



    <?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<Button android:id="@+id/btn_yubichall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yubi challenge"
/>

<TextView
android:id="@+id/text_result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</LinearLayout>









share|improve this question























  • If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

    – G.hakim
    Nov 21 '18 at 6:29











  • because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

    – Philipp
    Nov 24 '18 at 7:38
















0















My app is starting an activity from another package with startActivityForResult. I observed problems when my launching activity gets recreated and saw that onActivityResult is not called in that case after the started activity returns. (It is called correctly if I do not trigger activity recreation.)



These are the steps I performed:




  • Start my activity

  • Click my button which calls startActivityForResult on the ykDroid app

  • Bring my app to background. This causes my activity to be destroyed as I have enabled this in the Android developer settings

  • Bring my app back to foreground (I see OnCreate is called)

  • Swipe a Yubikey NEO which causes the other activity to return.

  • Watch logcat to see that OnActivityResult is not called.


I found out that if I call RequestPermissions for Permission.UseFingerprint I get the OnActivityResult callback even after activity recreation. I don't have a clue why. Can anybody explain this behavior?
Could it be related to ykDroid? see https://github.com/pp3345/ykDroid for their source code.



Here is what I used for testing (Xamarin Android):



[Activity(Label = "@string/app_name", Theme = "@style/MyTheme")]
public class DatabaseSettingsActivity : Activity
{

protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.yubichall_test);

FindViewById<Button>(Resource.Id.btn_yubichall).Click += (sender, args) =>
{

byte challenge64 = new byte[64];
for (int i = 0; i < 64; i++)
{
challenge64[i] = (byte) i;


}
var chalIntent = TryGetYubichallengeIntentOrPrompt(challenge64, true);

StartActivityForResult(chalIntent, 123);

};


//Uncomment this and it will work
/* if ((int)Build.VERSION.SdkInt >= 23)
RequestPermissions(new { Manifest.Permission.UseFingerprint }, 99);*/
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Kp2aLog.Log("OnActivityResult: " + requestCode);
if (resultCode == Result.Ok)
{
byte challengeResponse = data.GetByteArrayExtra("response");
if ((challengeResponse != null) && (challengeResponse.Length > 0))
{
FindViewById<TextView>(Resource.Id.text_result).Text =
MemUtil.ByteArrayToHexString(challengeResponse);

}
}
}


public Intent TryGetYubichallengeIntentOrPrompt(byte challenge, bool promptToInstall)
{
Intent chalIntent = new Intent("net.pp3345.ykdroid.intent.action.CHALLENGE_RESPONSE");
chalIntent.PutExtra("challenge", challenge);

IList<ResolveInfo> activities = PackageManager.QueryIntentActivities(chalIntent, 0);
bool isIntentSafe = activities.Count > 0;
if (isIntentSafe)
{
return chalIntent;
}
if (promptToInstall)
{
//please install https://play.google.com/store/apps/details?id=net.pp3345.ykdroid&hl=en
}
return null;
}
}


where the layout yubicall_test is



    <?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<Button android:id="@+id/btn_yubichall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yubi challenge"
/>

<TextView
android:id="@+id/text_result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</LinearLayout>









share|improve this question























  • If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

    – G.hakim
    Nov 21 '18 at 6:29











  • because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

    – Philipp
    Nov 24 '18 at 7:38














0












0








0








My app is starting an activity from another package with startActivityForResult. I observed problems when my launching activity gets recreated and saw that onActivityResult is not called in that case after the started activity returns. (It is called correctly if I do not trigger activity recreation.)



These are the steps I performed:




  • Start my activity

  • Click my button which calls startActivityForResult on the ykDroid app

  • Bring my app to background. This causes my activity to be destroyed as I have enabled this in the Android developer settings

  • Bring my app back to foreground (I see OnCreate is called)

  • Swipe a Yubikey NEO which causes the other activity to return.

  • Watch logcat to see that OnActivityResult is not called.


I found out that if I call RequestPermissions for Permission.UseFingerprint I get the OnActivityResult callback even after activity recreation. I don't have a clue why. Can anybody explain this behavior?
Could it be related to ykDroid? see https://github.com/pp3345/ykDroid for their source code.



Here is what I used for testing (Xamarin Android):



[Activity(Label = "@string/app_name", Theme = "@style/MyTheme")]
public class DatabaseSettingsActivity : Activity
{

protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.yubichall_test);

FindViewById<Button>(Resource.Id.btn_yubichall).Click += (sender, args) =>
{

byte challenge64 = new byte[64];
for (int i = 0; i < 64; i++)
{
challenge64[i] = (byte) i;


}
var chalIntent = TryGetYubichallengeIntentOrPrompt(challenge64, true);

StartActivityForResult(chalIntent, 123);

};


//Uncomment this and it will work
/* if ((int)Build.VERSION.SdkInt >= 23)
RequestPermissions(new { Manifest.Permission.UseFingerprint }, 99);*/
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Kp2aLog.Log("OnActivityResult: " + requestCode);
if (resultCode == Result.Ok)
{
byte challengeResponse = data.GetByteArrayExtra("response");
if ((challengeResponse != null) && (challengeResponse.Length > 0))
{
FindViewById<TextView>(Resource.Id.text_result).Text =
MemUtil.ByteArrayToHexString(challengeResponse);

}
}
}


public Intent TryGetYubichallengeIntentOrPrompt(byte challenge, bool promptToInstall)
{
Intent chalIntent = new Intent("net.pp3345.ykdroid.intent.action.CHALLENGE_RESPONSE");
chalIntent.PutExtra("challenge", challenge);

IList<ResolveInfo> activities = PackageManager.QueryIntentActivities(chalIntent, 0);
bool isIntentSafe = activities.Count > 0;
if (isIntentSafe)
{
return chalIntent;
}
if (promptToInstall)
{
//please install https://play.google.com/store/apps/details?id=net.pp3345.ykdroid&hl=en
}
return null;
}
}


where the layout yubicall_test is



    <?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<Button android:id="@+id/btn_yubichall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yubi challenge"
/>

<TextView
android:id="@+id/text_result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</LinearLayout>









share|improve this question














My app is starting an activity from another package with startActivityForResult. I observed problems when my launching activity gets recreated and saw that onActivityResult is not called in that case after the started activity returns. (It is called correctly if I do not trigger activity recreation.)



These are the steps I performed:




  • Start my activity

  • Click my button which calls startActivityForResult on the ykDroid app

  • Bring my app to background. This causes my activity to be destroyed as I have enabled this in the Android developer settings

  • Bring my app back to foreground (I see OnCreate is called)

  • Swipe a Yubikey NEO which causes the other activity to return.

  • Watch logcat to see that OnActivityResult is not called.


I found out that if I call RequestPermissions for Permission.UseFingerprint I get the OnActivityResult callback even after activity recreation. I don't have a clue why. Can anybody explain this behavior?
Could it be related to ykDroid? see https://github.com/pp3345/ykDroid for their source code.



Here is what I used for testing (Xamarin Android):



[Activity(Label = "@string/app_name", Theme = "@style/MyTheme")]
public class DatabaseSettingsActivity : Activity
{

protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.yubichall_test);

FindViewById<Button>(Resource.Id.btn_yubichall).Click += (sender, args) =>
{

byte challenge64 = new byte[64];
for (int i = 0; i < 64; i++)
{
challenge64[i] = (byte) i;


}
var chalIntent = TryGetYubichallengeIntentOrPrompt(challenge64, true);

StartActivityForResult(chalIntent, 123);

};


//Uncomment this and it will work
/* if ((int)Build.VERSION.SdkInt >= 23)
RequestPermissions(new { Manifest.Permission.UseFingerprint }, 99);*/
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Kp2aLog.Log("OnActivityResult: " + requestCode);
if (resultCode == Result.Ok)
{
byte challengeResponse = data.GetByteArrayExtra("response");
if ((challengeResponse != null) && (challengeResponse.Length > 0))
{
FindViewById<TextView>(Resource.Id.text_result).Text =
MemUtil.ByteArrayToHexString(challengeResponse);

}
}
}


public Intent TryGetYubichallengeIntentOrPrompt(byte challenge, bool promptToInstall)
{
Intent chalIntent = new Intent("net.pp3345.ykdroid.intent.action.CHALLENGE_RESPONSE");
chalIntent.PutExtra("challenge", challenge);

IList<ResolveInfo> activities = PackageManager.QueryIntentActivities(chalIntent, 0);
bool isIntentSafe = activities.Count > 0;
if (isIntentSafe)
{
return chalIntent;
}
if (promptToInstall)
{
//please install https://play.google.com/store/apps/details?id=net.pp3345.ykdroid&hl=en
}
return null;
}
}


where the layout yubicall_test is



    <?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<Button android:id="@+id/btn_yubichall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yubi challenge"
/>

<TextView
android:id="@+id/text_result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</LinearLayout>






android xamarin.android android-lifecycle






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 21 '18 at 3:15









PhilippPhilipp

7,081445102




7,081445102













  • If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

    – G.hakim
    Nov 21 '18 at 6:29











  • because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

    – Philipp
    Nov 24 '18 at 7:38



















  • If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

    – G.hakim
    Nov 21 '18 at 6:29











  • because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

    – Philipp
    Nov 24 '18 at 7:38

















If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

– G.hakim
Nov 21 '18 at 6:29





If that fixes your issue than why not request permission anyway you have to have runtime permissions in your app!

– G.hakim
Nov 21 '18 at 6:29













because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

– Philipp
Nov 24 '18 at 7:38





because 1.) not everybody has API Level >= 23 2.) it doesn't make sense to request fingerprint permissions if I don't need them 3.) I don't think this will actually solve the problem on all devices 4.) I don't like fixes I do not understand.

– Philipp
Nov 24 '18 at 7:38












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