crash when calling createAdsLoader of ImaSdkFactory

[Chang Alex]

03-11 00:24:19.578 E/AndroidRuntime(11364): java.lang.NullPointerException: Attempt to read from field 'android.os.MessageQueue android.os.Looper.mQueue' on a null object reference

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.os.Handler.<init>(Handler.java:229)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.os.Handler.<init>(Handler.java:137)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.<init>(AwContentsClientCallbackHelper.java:94)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.<init>(AwContentsClientCallbackHelper.java:92)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at org.chromium.android_webview.AwContentsClientCallbackHelper.<init>(AwContentsClientCallbackHelper.java:153)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at org.chromium.android_webview.AwContentsClient.<init>(AwContentsClient.java:51)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at org.chromium.android_webview.AwContentsClient.<init>(AwContentsClient.java:46)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.android.webview.chromium.WebViewContentsClientAdapter.<init>(WebViewContentsClientAdapter.java:119)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.android.webview.chromium.WebViewChromium.init(WebViewChromium.java:226)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.webkit.WebView.<init>(WebView.java:554)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.webkit.WebView.<init>(WebView.java:489)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.webkit.WebView.<init>(WebView.java:472)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.webkit.WebView.<init>(WebView.java:459)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at android.webkit.WebView.<init>(WebView.java:449)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.impl.y.<init>(IMASDK:37)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.impl.x.<init>(IMASDK:237)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.impl.g.<init>(IMASDK:239)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.impl.g.<init>(IMASDK:233)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.api.ImaSdkFactory.createAdsLoader(IMASDK:55)

03-11 00:24:19.578 E/AndroidRuntime(11364):     at com.google.ads.interactivemedia.v3.api.ImaSdkFactory.createAdsLoader(IMASDK:47)

Please help.

Thanks

Alex

[Vu Chau (IMA SDK Team)]

Hi Alex,

Which SDK version are you on?  Could you send us some sample code/minified project and the steps that can reproduce this issue?

Vu Chau

IMA SDK Team

[Chang Alex]

Hi

I used the latest sdk.jar.

I cannot provide the project because it is not my personal project.

My flow is the following: User's Android application->JNI->our C++ engine->JNI->Google IMA SDK

When I tried other User's Android application codes, this flow did not have any issue. When I tried other user's, it generated this crash.

Thanks

Alex

[Vu Chau (IMA SDK Team)]

Hi Alex,

Thanks for the info, but without any relevant code and insight into what the other components of the app are doing, it won't be possible for us to troubleshoot this crash.  

Make sure you are creating the AdsLoader as we guide in our docs. 

Vu Chau

IMA SDK Team

[Chang Alex]

Hi Vu,

I found the root cause. This function needs to be called in the main thread. It seems that IMA SDK does not handle UI objects used in non-main thread. If IMA SDK document can mentioned this restriction, it will be better.

Thanks

Alex

[Vu Chau (IMA SDK Team)]

Hi Alex,

That is correct.  In Android, UI objects are not thread-safe--they should only be updated on the main (which is why it's also called a UI) thread. 

You must do any UI-related work, such as configuring the AdsLoader to use a different language, on the main thread.  So, be sure to surface your UI objects to the main thread and do any update/manipulation on them there.  Failing to do so could cause your app to crash.

Vu Chau

IMA SDK Team