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Suspending or minimizing my app messes UI and crashes app

See original GitHub issue

Hi. I have this little problem with my NativeScript app. I just created a new project using the Hello World template. And I noticed that the app’s UI disappears when app issuspended once, and crashes when it gets suspended or minimized twice.

The following text appear in my command line on Windows:

W/System.err(29479): com.tns.Runtime.callJSMethodNative(Native Method) W/System.err(29479): com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043) W/System.err(29479): com.tns.Runtime.callJSMethodImpl(Runtime.java:925) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:912) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:896) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:888) W/System.err(29479): at com.tns.Runtime.callJSMethodNative(Native Method) W/System.err(29479): at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043) W/System.err(29479): at com.tns.Runtime.callJSMethodImpl(Runtime.java:925) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:912) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:896) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:888) W/System.err(29479): com.tns.Runtime.callJSMethodNative(Native Method) W/System.err(29479): com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043) W/System.err(29479): com.tns.Runtime.callJSMethodImpl(Runtime.java:925) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:912) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:896) W/System.err(29479): com.tns.Runtime.callJSMethod(Runtime.java:888) W/System.err(29479): at com.tns.Runtime.callJSMethodNative(Native Method) W/System.err(29479): at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043) W/System.err(29479): at com.tns.Runtime.callJSMethodImpl(Runtime.java:925) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:912) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:896) W/System.err(29479): at com.tns.Runtime.callJSMethod(Runtime.java:888)

The exception report states the following:

An uncaught Exception occurred on "main" thread.
java.lang.RuntimeException: Unable to resume activity {org.nativescript.SCI/com.tns.NativeScriptActivity}: com.tns.NativeScriptException:
Calling js method onStart failed

Error: java.lang.NullPointerException
    android.view.ViewGroup.removeViewInternal(ViewGroup.java:4041)
    android.view.ViewGroup.removeViewAt(ViewGroup.java:3998)
    org.nativescript.widgets.GridLayout.removeViewAt(GridLayout.java:143)
    com.tns.Runtime.callJSMethodNative(Native Method)
    com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
    com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
    com.tns.Runtime.callJSMethod(Runtime.java:912)
    com.tns.Runtime.callJSMethod(Runtime.java:896)
    com.tns.Runtime.callJSMethod(Runtime.java:888)
    com.tns.NativeScriptActivity.onStart(NativeScriptActivity.java:38)
    android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1174)
    android.app.Activity.performStart(Activity.java:5274)
    android.app.Activity.performRestart(Activity.java:5330)
    android.app.Activity.performResume(Activity.java:5335)
    android.app.ActivityThread.performResumeActivity(ActivityThread.java:2950)
    android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2993)
    android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
    android.os.Handler.dispatchMessage(Handler.java:110)
    android.os.Looper.loop(Looper.java:193)
    android.app.ActivityThread.main(ActivityThread.java:5292)
    java.lang.reflect.Method.invokeNative(Native Method)
    java.lang.reflect.Method.invoke(Method.java:515)
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
    dalvik.system.NativeStart.main(Native Method)
File: "file:///data/data/org.nativescript.SCI/files/app/main-page.js, line: 17, column: 50

StackTrace:
Frame: function:'initialDelaration', file:'file:///data/data/org.nativescript.SCI/files/app/main-page.js', line: 17, column: 51
Frame: function:'Observable.notify', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 103, column: 23
Frame: function:'Observable._emit', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 120, column: 18
Frame: function:'ViewBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 208, column: 14
Frame: function:'View.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view.js', line: 62, column: 35
Frame: function:'PageBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/page/page-common.js', line: 91, column: 35
Frame: function:'Page.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/page/page.js', line: 105, column: 35
Frame: function:'', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 212, column: 19
Frame: function:'FrameBase.eachChildView', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/frame-common.js', line: 350, column: 13
Frame: function:'ViewCommon.eachChild', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view-common.js', line: 690, column: 14
Frame: function:'ViewBase._loadEachChild', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 211, column: 14
Frame: function:'ViewBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 207, column: 14
Frame: function:'View.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view.js', line: 62, column: 35
Frame: function:'ActivityCallbacksImplementation.onStart', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/frame.js', line: 724, column: 22
Frame: function:'NativeScriptActivity.onStart', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/activity.js', line: 26, column: 25

at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2964)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2993)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.tns.NativeScriptException:
Calling js method onStart failed

Error: java.lang.NullPointerException
    android.view.ViewGroup.removeViewInternal(ViewGroup.java:4041)
    android.view.ViewGroup.removeViewAt(ViewGroup.java:3998)
    org.nativescript.widgets.GridLayout.removeViewAt(GridLayout.java:143)
    com.tns.Runtime.callJSMethodNative(Native Method)
    com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
    com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
    com.tns.Runtime.callJSMethod(Runtime.java:912)
    com.tns.Runtime.callJSMethod(Runtime.java:896)
    com.tns.Runtime.callJSMethod(Runtime.java:888)
    com.tns.NativeScriptActivity.onStart(NativeScriptActivity.java:38)
    android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1174)
    android.app.Activity.performStart(Activity.java:5274)
    android.app.Activity.performRestart(Activity.java:5330)
    android.app.Activity.performResume(Activity.java:5335)
    android.app.ActivityThread.performResumeActivity(ActivityThread.java:2950)
    android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2993)
    android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
    android.os.Handler.dispatchMessage(Handler.java:110)
    android.os.Looper.loop(Looper.java:193)
    android.app.ActivityThread.main(ActivityThread.java:5292)
    java.lang.reflect.Method.invokeNative(Native Method)
    java.lang.reflect.Method.invoke(Method.java:515)
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
    dalvik.system.NativeStart.main(Native Method)
File: "file:///data/data/org.nativescript.SCI/files/app/main-page.js, line: 17, column: 50

StackTrace:
Frame: function:'initialDelaration', file:'file:///data/data/org.nativescript.SCI/files/app/main-page.js', line: 17, column: 51
Frame: function:'Observable.notify', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 103, column: 23
Frame: function:'Observable._emit', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 120, column: 18
Frame: function:'ViewBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 208, column: 14
Frame: function:'View.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view.js', line: 62, column: 35
Frame: function:'PageBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/page/page-common.js', line: 91, column: 35
Frame: function:'Page.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/page/page.js', line: 105, column: 35
Frame: function:'', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 212, column: 19
Frame: function:'FrameBase.eachChildView', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/frame-common.js', line: 350, column: 13
Frame: function:'ViewCommon.eachChild', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view-common.js', line: 690, column: 14
Frame: function:'ViewBase._loadEachChild', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 211, column: 14
Frame: function:'ViewBase.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view-base/view-base.js', line: 207, column: 14
Frame: function:'View.onLoaded', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/core/view/view.js', line: 62, column: 35
Frame: function:'ActivityCallbacksImplementation.onStart', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/frame.js', line: 724, column: 22
Frame: function:'NativeScriptActivity.onStart', file:'file:///data/data/org.nativescript.SCI/files/app/tns_modules/tns-core-modules/ui/frame/activity.js', line: 26, column: 25

at com.tns.Runtime.callJSMethodNative(Native Method)
at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1043)
at com.tns.Runtime.callJSMethodImpl(Runtime.java:925)
at com.tns.Runtime.callJSMethod(Runtime.java:912)
at com.tns.Runtime.callJSMethod(Runtime.java:896)
at com.tns.Runtime.callJSMethod(Runtime.java:888)
at com.tns.NativeScriptActivity.onStart(NativeScriptActivity.java:38)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1174)
at android.app.Activity.performStart(Activity.java:5274)
at android.app.Activity.performRestart(Activity.java:5330)
at android.app.Activity.performResume(Activity.java:5335)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2950)
... 10 more
Caused by: java.lang.NullPointerException
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4041)
at android.view.ViewGroup.removeViewAt(ViewGroup.java:3998)
at org.nativescript.widgets.GridLayout.removeViewAt(GridLayout.java:143)
... 22 more

and the logcat is attached. logcat.txt

The issue is simple to trigger: Just minimize or suspend twice. The first time, the UI will disappear. The second time, the app will crash.

If you need my project to test the issue here it is.

https://goo.gl/MqKGYD

I’m using a 4.4.2 tablet to test the app, as that is the minimum target.

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Reactions:1
  • Comments:7 (4 by maintainers)

github_iconTop GitHub Comments

1reaction
JorgeHawkinscommented, Aug 10, 2017

I found that the device constantly tries to free resources as soon as the app gets suspended or minimized, as the table has only about 300 MB of RAM. I used the LowMemory event to detect the issue. As soon as I added it to my code, every single time I suspended the application, the app would throw a low memory warning. I added an exception to the LowMemory event and “solved” it.

0reactions
lock[bot]commented, Aug 28, 2019

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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