Android Question Cannot instance android.media.audiofx.visualizer - SOLVED!

artsoft · May 15, 2023

Hi!

I want to test the audio fx visualizer example found in this forum - made by @stevel05!

Here the page:
https://www.b4x.com/android/forum/threads/audio-visualizer.41850/

But no chance to test it, cause I get always this error:

2023-05-15 10_58_50-Vizualizer - B4A.png

Current manifest is:

B4X:

'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="19" android:targetSdkVersion="33"/>
<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.
AddPermission("android.permission.RECORD_AUDIO")
AddPermission("android.permission.MODIFY_AUDIO_SETTINGS")

There is no audiofx libs listed within the SDK manager.

In the screenshot above you can see that only these 2 entries are found while looking for "android.media"... :-(

And here, there is no DEPRECATION of this lib:
https://developer.android.com/reference/android/media/audiofx/Visualizer.html

What should I do?

Thanks in advance for any help.

Regards
ARTsoft

Erel · May 15, 2023

Please post code and logs as text.

artsoft · May 15, 2023

Erel said:
Please post code and logs as text.

Hi Erel!

Code is from this example:
https://www.b4x.com/android/forum/attachments/visualizer-zip.65933/

You can find it here:
https://www.b4x.com/android/forum/threads/audio-visualizer.41850/

Error-Log (see please row 211):

B4X:

** Activity (main) Create (first time) **
vizualizer_initialize (java line: 211)
java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Constructor.newInstance0(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
    at anywheresoftware.b4j.object.JavaObject.InitializeNewInstance(JavaObject.java:91)
    at b4a.example.vizualizer._initialize(vizualizer.java:211)
    at b4a.example.main._activity_create(main.java:372)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
    at b4a.example.main.afterFirstLayout(main.java:105)
    at b4a.example.main.access$000(main.java:17)
    at b4a.example.main$WaitForLayout.run(main.java:83)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
Caused by: java.lang.RuntimeException: Cannot initialize Visualizer engine, error: -3
    at android.media.audiofx.Visualizer.<init>(Visualizer.java:238)
    ... 18 more
java.lang.reflect.InvocationTargetException

Java-Code:

As Text:

B4X:

public String _initialize(anywheresoftware.b4a.BA _ba,Object _module,int _audiosession) throws Exception{
innerInitialize(_ba);
 //BA.debugLineNum = 14;BA.debugLine="Public Sub Initialize(Module As Object,AudioSessio";
 //BA.debugLineNum = 15;BA.debugLine="mModule = Module";
_mmodule = _module;
 //BA.debugLineNum = 17;BA.debugLine="Viz.InitializeNewInstance(\"android.media.audiofx.";
_viz.InitializeNewInstance("android.media.audiofx.Visualizer",new Object[]{(Object)(_audiosession)});
//BA.debugLineNum = 19;BA.debugLine="End Sub";
return "";
}

This is the code of the Visualizer class:

B4X:

'Initializes the object. You can add parameters to this method if needed.
Public Sub Initialize(Module As Object,AudioSession As Int)
    mModule = Module
    
    Viz.InitializeNewInstance("android.media.audiofx.Visualizer", Array As Object(AudioSession))
    
End Sub

I hope this will help!

Thanks a lot.

agraham · May 15, 2023

Steve's example works for me once I added an mp3 file as directed in the example. I didn't need to mess with SDKManager - perhaps that's what screwed it up for you.

artsoft · May 15, 2023

agraham said:
Steve's example works for me once I added an mp3 file as directed in the example. I didn't need to mess with SDKManager - perhaps that's what screwed it up for you.

I also added an mp3 file of my owns!
I also added other audio file formats ... but always the same issue.

My "audiosession", which is needed for vidualizer init, is valid as well.

I can see that my android.jar includes these audiofx classes:

Thanks for trying to help

artsoft · May 15, 2023

@DonManfred + @agraham

Hi DonManfred!

Agraham could start and init the visualizer. But I dont know, which Android version agraham currently uses for the test.

It's a simple creation of a new instance - the visualizer class is included in all android.jar files.

B4X:

Viz.InitializeNewInstance("android.media.audiofx.Visualizer", Array As Object(AudioSession))

Nothing more...

Thanks

Update: Oh, I see you deleted yopur post...

artsoft · May 15, 2023

Additional info while create an instance:

Parameters

audioSession Int

System wide unique audio session identifier. If audioSession is not 0, the visualizer will be attached to the MediaPlayer or AudioTrack in the same audio session. Otherwise, the Visualizer will apply to the output mix.

agraham · May 15, 2023

It's irrelevant whether Android.jar includes Visualizer as it is accessed at runtime by reflection in Visualizer.bas and so there is no need for it at compile time which is when Android.jar is used. By the way, Android.jar holds no code, only outline definitions for the classes and methods that should be present on the phone or tablet.

The actual problem seems to be that Visualizer is not accessible by reflection if the first install of the app targets SDK 23 or higher. I've no idea why this is. Android did restrict non-SDK access by reflection from SDK 28 onwards but SDK 23 does of course predate this restriction. However it does look like you are out of luck here.

artsoft · May 15, 2023

agraham said:
It's irrelevant whether Android.jar includes Visualizer as it is accessed at runtime by reflection in Visualizer.bas and so there is no need for it at compile time which is when Android.jar is used. By the way, Android.jar holds no code, only outline definitions for the classes and methods that should be present on the phone or tablet.

The actual problem seems to be that Visualizer is not accessible by reflection if the first install of the app targets SDK 23 or higher. I've no idea why this is. Android did restrict non-SDK access by reflection from SDK 28 onwards but SDK 23 does of course predate this restriction. However it does look like you are out of luck here.

Thanks for this info.

Out of luck is : ......

...... and not acceptable ;-)

My current SDK is 31 and this is the error (value of -3):

artsoft · May 15, 2023

Next step:

I asked for RunTime - Permissions while running the app ..... now I get other error messages:

B4X:

** Activity (main) Create (first time) **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
vizualizer_stopdatacapture (java line: 325)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object anywheresoftware.b4j.object.JavaObject.RunMethod(java.lang.String, java.lang.Object[])' on a null object reference
    at b4a.example.vizualizer._stopdatacapture(vizualizer.java:325)
    at b4a.example.main._activity_pause(main.java:454)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
    at b4a.example.main.onPause(main.java:275)
    at android.app.Activity.performPause(Activity.java:8389)
    at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1531)
    at android.app.ActivityThread.performPauseActivityIfNeeded(ActivityThread.java:5152)
    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:5113)
    at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:5065)
    at android.app.servertransaction.PauseActivityItem.execute(PauseActivityItem.java:47)
    at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
    at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2260)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object anywheresoftware.b4j.object.JavaObject.RunMethod(java.lang.String, java.lang.Object[])' on a null object reference
sending message to waiting queue (activity_permissionresult)
running waiting messages (1)
wavdraw_initialize (java line: 197)
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/util/ByteArrayBuffer;
    at com.stevel05.myByteArrayBuffer.Initialize(myByteArrayBuffer.java:23)
    at b4a.example.wavdraw._initialize(wavdraw.java:197)
    at b4a.example.vizualizer._drawwavforminitialize(vizualizer.java:86)
    at b4a.example.main$ResumableSub_Activity_Create.resume(main.java:437)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:275)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:215)
    at anywheresoftware.b4a.BA$2.run(BA.java:395)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:467)
    at b4a.example.main$ResumeMessage.run(main.java:313)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.ByteArrayBuffer
    ... 17 more
wavdraw_initialize (java line: 197)
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/util/ByteArrayBuffer;
    at com.stevel05.myByteArrayBuffer.Initialize(myByteArrayBuffer.java:23)
    at b4a.example.wavdraw._initialize(wavdraw.java:197)
    at b4a.example.vizualizer._drawwavforminitialize(vizualizer.java:86)
    at b4a.example.main$ResumableSub_Activity_Create.resume(main.java:437)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:275)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:215)
    at anywheresoftware.b4a.BA$2.run(BA.java:395)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:467)
    at b4a.example.main$ResumeMessage.run(main.java:313)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.ByteArrayBuffer
    ... 17 more

ClassNotFoundError......... :-(

I guess that this error is based on other issue in the example!
I will check this

agraham · May 15, 2023

Got it! It's a permission change after SDK 22. Add these lines to Activity_Create before initialising the visualizer.

B4X:

    Dim rp As RuntimePermissions
    rp.CheckAndRequest(rp.PERMISSION_RECORD_AUDIO)
    Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
    Log("Permission - " & Result)
    
    'Initialize the Visualizer
    Viz.Initialize(Me,AudioSession)

artsoft · May 15, 2023

agraham said:
Got it! It's a permission change after SDK 22. Add these lines to Activity_Create before initialising the visualizer.

B4X:

Dim rp As RuntimePermissions rp.CheckAndRequest(rp.PERMISSION_RECORD_AUDIO) Wait For Activity_PermissionResult (Permission As String, Result As Boolean) Log("Permission - " & Result) 'Initialize the Visualizer Viz.Initialize(Me,AudioSession)

I already added these lines - i also used them in another project!

And look at this:

This user had the same issue like me - his solution is also the same:

Thanks for your help!!

Regards

agraham · May 15, 2023

Not sure what you are saying in the post above but it works for me!

artsoft · May 15, 2023

agraham said:
Not sure what you are saying in the post above but it works for me!

I said, that I already added these RuntimePermissions lines in the example code and that another user had the same issue in 2019 as well.

...

Now it works also on my side!

Thanks again.

I set the title of this to SOLVED!

amer bashar · Sep 26, 2023

artsoft said:

Next step:

I asked for RunTime - Permissions while running the app ..... now I get other error messages:

B4X:

** Activity (main) Create (first time) **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
vizualizer_stopdatacapture (java line: 325)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object anywheresoftware.b4j.object.JavaObject.RunMethod(java.lang.String, java.lang.Object[])' on a null object reference
    at b4a.example.vizualizer._stopdatacapture(vizualizer.java:325)
    at b4a.example.main._activity_pause(main.java:454)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
    at b4a.example.main.onPause(main.java:275)
    at android.app.Activity.performPause(Activity.java:8389)
    at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1531)
    at android.app.ActivityThread.performPauseActivityIfNeeded(ActivityThread.java:5152)
    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:5113)
    at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:5065)
    at android.app.servertransaction.PauseActivityItem.execute(PauseActivityItem.java:47)
    at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
    at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2260)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object anywheresoftware.b4j.object.JavaObject.RunMethod(java.lang.String, java.lang.Object[])' on a null object reference
sending message to waiting queue (activity_permissionresult)
running waiting messages (1)
wavdraw_initialize (java line: 197)
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/util/ByteArrayBuffer;
    at com.stevel05.myByteArrayBuffer.Initialize(myByteArrayBuffer.java:23)
    at b4a.example.wavdraw._initialize(wavdraw.java:197)
    at b4a.example.vizualizer._drawwavforminitialize(vizualizer.java:86)
    at b4a.example.main$ResumableSub_Activity_Create.resume(main.java:437)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:275)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:215)
    at anywheresoftware.b4a.BA$2.run(BA.java:395)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:467)
    at b4a.example.main$ResumeMessage.run(main.java:313)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.ByteArrayBuffer
    ... 17 more
wavdraw_initialize (java line: 197)
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/util/ByteArrayBuffer;
    at com.stevel05.myByteArrayBuffer.Initialize(myByteArrayBuffer.java:23)
    at b4a.example.wavdraw._initialize(wavdraw.java:197)
    at b4a.example.vizualizer._drawwavforminitialize(vizualizer.java:86)
    at b4a.example.main$ResumableSub_Activity_Create.resume(main.java:437)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:275)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:215)
    at anywheresoftware.b4a.BA$2.run(BA.java:395)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:467)
    at b4a.example.main$ResumeMessage.run(main.java:313)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:210)
    at android.os.Looper.loop(Looper.java:299)
    at android.app.ActivityThread.main(ActivityThread.java:8168)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1037)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.ByteArrayBuffer
    ... 17 more

ClassNotFoundError......... :-(

I guess that this error is based on other issue in the example!
I will check this

hi, I have this same error, I have tried the RuntimePermissions solution and it didn`t worked, please how did you fix that?

Android Question Cannot instance android.media.audiofx.visualizer - SOLVED!

artsoft

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Erel

B4X founder

artsoft

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agraham

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artsoft

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artsoft

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artsoft

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Parameters

agraham

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artsoft

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artsoft

Active Member

agraham

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artsoft

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agraham

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artsoft

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amer bashar

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Android Question Cannot instance android.media.audiofx.visualizer - SOLVED!

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