Android Question Actionbar / Sliding panel error

samikinikar · Feb 2, 2016

Hello,

I am not able to run the following actionbar.zip example located in https://www.b4x.com/android/forum/threads/actionbar-sliding-pages-tutorial.36865/

There is no change made in the code, just unzip and trying to execute.
Android 4+ is already added to the additional library resource.

I displays the following error

** Activity (main) Pause, UserClosed = false **
** Activity (main) Create, isFirst = true **
Error occurred on line: 36 (Main)
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setIcon(android.graphics.drawable.Drawable)' on a null object reference
at anywheresoftware.b4a.objects.StdActionBar.setIcon(StdActionBar.java:227)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:742)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:342)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at b4a.example.test123.main.afterFirstLayout(main.java:102)
at b4a.example.test123.main.access$000(main.java:17)
at b4a.example.test123.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

Erel · Feb 3, 2016

What is line number 36 in your code?

Have you initialized the bar object?

samikinikar · Feb 4, 2016

Yes it is initialized, attached is screenshot of the code.

Erel · Feb 4, 2016

The error message points to line 36 while the error itself seems to happen on the previous line. Do you still get this exact error message?

Are you testing it on a real device? It seems like there is no action bar in your device.

samikinikar · Feb 4, 2016

Yes I am testing it on a real device
1. Device : Cynanogen (YUPHORIA) Android version 5.1.1
2. Device : Samsung Galaxy TAB4 , Android version 4.4.2

Same on both the devices.

The current error log is

Error occurred on line: 35 (Main)
java.lang.NullPointerException
at anywheresoftware.b4a.objects.StdActionBar.setIcon(StdActionBar.java:227)
at b4a.example.test123.main._activity_create(main.java:377)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:697)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at b4a.example.test123.main.afterFirstLayout(main.java:102)
at b4a.example.test123.main.access$000(main.java:17)
at b4a.example.test123.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5479)
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:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

Erel · Feb 4, 2016

Can you post the code from the manifest editor?

samikinikar · Feb 4, 2016

The code is as follows...

'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: http://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14"/>
<supports-screens android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
'End of default text.
SetApplicationAttribute(android:theme, "@android:style/Theme.Holo.Light")
SetApplicationAttribute(android:uiOptions, "splitActionBarWhenNarrow")

Erel · Feb 4, 2016

Sorry but I don't know why it doesn't work on your devices. It seems like they use a custom theme that doesn't include the standard action bar.

samikinikar · Feb 4, 2016

ok now tested in MI Xiomi .. same error

** Activity (main) Create, isFirst = true **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Create, isFirst = true **
Error occurred on line: 35 (Main)
java.lang.NullPointerException
at anywheresoftware.b4a.objects.StdActionBar.setIcon(StdActionBar.java:227)
at b4a.example.test123.main._activity_create(main.java:377)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:697)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:339)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:246)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)
at b4a.example.test123.main.afterFirstLayout(main.java:102)
at b4a.example.test123.main.access$000(main.java:17)
at b4a.example.test123.main$WaitForLayout.run(main.java:80)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5349)
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:835)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:651)
at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Resume **
** Activity (main) Resume **

** Activity (main) Resume **
** Activity (main) Resume **
PackageAdded: package:com.google.android.music

Erel · Feb 4, 2016

As you are the only one to encounter this issue and you encountered it on three different devices then I can guess that there is a problem in your configuration.

samikinikar · Feb 4, 2016

Ok now complete new installation right from step1 on a new desktop, new download .net version, jdk and android-sdk

Now the error is ...

*** Remote compilation mode ***
B4A version: 5.50
Parsing code. (0.00s)
Compiling code. (0.03s)
Compiling layouts code. (0.02s)
Compiling debugger engine code. (0.75s)
Sending data to remote compiler. Error
step: Compiling generated Java code.
javac 1.7.0
src\b4a\example\main.java:345: error: cannot find symbol
public anywheresoftware.b4a.objects.StdActionBar _bar = null;
^
symbol: class StdActionBar
location: package anywheresoftware.b4a.objects
1 error

Erel · Feb 4, 2016

It will not work in remote compilation mode.

samikinikar · Feb 4, 2016

At last, its working now...you are right ..something wrong with my configurations, on a new machine, all new downloads, everything is working fine now...
I will check out whats wrong with my laptop config... thanks a lot for all your support.

Android Question Actionbar / Sliding panel error

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