Java Question ExoPlayer Wrapper Development

ronovar · May 15, 2016

Hi...i im trying to develope library for B4A that i will use...

I have found ExoPlayer that suits my needs...so i installed Eclipse...see tutorial how to create B4A libraries, compile from sources ExoPlayer...got library.jar and now i need help how to write public functions to initialize player, add to view, add url file, and play file.

i im this way:

B4X:

package com.google.exoplayerb4a;

import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.objects.ViewWrapper;

import com.google.android.exoplayer.*;

@ShortName("ExoPlayerB4A")
@BA.Version(1.5F)

public class ExoPlayerB4A
  extends ViewWrapper<ExoPlayer>
{

}

Here is wrapper:

https://github.com/googleads/google...ork/exoplayerextensions/ExoplayerWrapper.java

So the question is how can i add exoplayer so that i can call from B4A:

B4X:

Dim ExoPlayer1 As ExoPlayerB4A

ExoPlayer1.Initialize("ExoPlayer1")
Activity.AddView(ExoPlayer1, 0, 0, 100%x, 100%y)

ExoPlayer1.SetURL("Http:\\myurl.com\file.mkv")
ExoPlayer1.Prepare
ExoPlayer1.Play

If someone can give me how can i add ExoPlayer to get thease functions it will be great...

ronovar · May 15, 2016

As can i see i need first to add native ExoPlayer View to B4A View....

I try using this code but it error:

B4X:

public class ExoPlayerWrapper
  extends ViewWrapper<ExoPlayer> {
}

DonManfred · May 15, 2016

See CustomView tutorial for b4j. Erel posted there the code you need to use in your java wrapper code.

ronovar · May 15, 2016

Thanks...i found that jar wrapper exists (and have videoview same api calls)...i added this in eclipse to build library:

B4X:

package google.b4a.exoplayer;

import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.objects.ViewWrapper;

import com.devbrackets.android.exomedia.EMVideoView;

@ShortName("ExoPlayer")
@BA.Version(1.0F)

public class ExoPlayerWrapper
  extends ViewWrapper<EMVideoView> {
   
    public static void LIBRARY_DOC() {}
   
    public void Initialize(BA paramBA, String paramString)
    {
        super.Initialize(paramBA, paramString);
    }

}

It compiles fine...B4A imports library fine...i added in B4A:

B4X:

'DEFINE - ExoPlayer
    Dim ExoPlayer1 As ExoPlayer

   ExoPlayer1.Initialize("ExoPlayer1")

And i im gettign in log:

B4X:

java.lang.RuntimeException: Object should first be initialized (ExoPlayer).

I did not get why public void Initialize does not initialize ExoPlayer?

ronovar · May 15, 2016

Here is the updated code:

B4X:

package google.b4a.exoplayer;

import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.DependsOn;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.objects.ViewWrapper;

import com.devbrackets.android.exomedia.EMVideoView;

@ShortName("ExoPlayer")
@DependsOn(values={"emvideoview"})
@BA.Version(1.0F)

public class ExoPlayer extends ViewWrapper<EMVideoView> {
    public void Initialize(BA paramBA, String paramString)
    {
        super.Initialize(paramBA, paramString);
    }
   
    @BA.Hide
    public void innerInitialize(final BA pBA, final String pEventName, boolean pKeepOldObject)
    {
        if (!pKeepOldObject)
       {
          EMVideoView videoView = new EMVideoView(pBA.context);
          setObject(videoView);
       }
       super.innerInitialize(pBA, pEventName, true);
    }
}

I call in B4A:

B4X:

'DEFINE - ExoPlayer
    Dim ExoPlayer1 As ExoPlayer
    ExoPlayer1.Initialize("ExoPlayer1")

And I im getting this error:

B4X:

** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
java.lang.NoClassDefFoundError: com.devbrackets.android.exomedia.EMVideoView
    at google.b4a.exoplayer.ExoPlayer.innerInitialize(ExoPlayer.java:25)
    at anywheresoftware.b4a.objects.ViewWrapper.Initialize(ViewWrapper.java:65)
    at google.b4a.exoplayer.ExoPlayer.Initialize(ExoPlayer.java:17)
    at b4a.example.main._activity_create(main.java:355)
    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:702)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:336)
    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.main.afterFirstLayout(main.java:102)
    at b4a.example.main.access$000(main.java:17)
    at b4a.example.main$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:5017)
    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:788)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:604)
    at dalvik.system.NativeStart.main(Native Method)
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = true **
** Service (starter) Destroy **

I copy ExoPlayer.jar and ExoPlayer.xml and emvideoview.jar to B4A libraries folder (emvideoview.jar is native EMVideoView compiled jar from github)

I included @DependsOn(values={"emvideoview"}) but errors is stil that it does not finc classdef why?

ronovar · May 16, 2016

Here is Project using SLC library compiler..if someone can look (it compiles fine...but B4A get error: java.lang.NoClassDefFoundError: com.devbrackets.android.exomedia.EMVideoView)

Here is SLC project...just look at ExoPlayer folder...

Erel · May 16, 2016

There is no need to upload SLC. You only need to upload your files.

EMVideoView.jar depends on classes such as: com.google.android.exoplayer.audio.AudioCapabilities
There is no such class inside the jar. You are missing another jar.

ronovar · May 16, 2016

Thanks...now it compiles without error ( i im just adding ExoPlayerWrapper.jar and forget to include ExoPlayer.jar from google...now when i call ExoPlayer1.Initialize("ExoPlayer1") in B4A it run program....now i need to wrap others api calls to eclipse so that i can test if is working)

Thanks Erel

ronovar · May 16, 2016

I got another problem..i need to get Sub ExoPlayer1_Prepared Event...i setup this in java:

B4X:

public class ExoPlayer extends ViewWrapper<EMVideoView> {
    /*
    * XML wrapper
    * Extract funtions in xml file
    */
    public static void LIBRARY_DOC() {}
   
    /*
    * Initialize the ExoPlayer object to B4A
    */
    @Override
    public void Initialize(BA paramBA, String paramString)
    {
        super.Initialize(paramBA, paramString);
    }
   
    /*
    * Wrap the ExoPlayer view to B4A view
    */
    @Override
    @BA.Hide
    public void innerInitialize(final BA pBA, final String pEventName, boolean pKeepOldObject)
    {
        if (!pKeepOldObject)
       {
          EMVideoView VideoView = new EMVideoView(pBA.context);

          if (pBA.subExists(pEventName + "_Prepared")) {
              VideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener()
              {
                  public void onPrepared(android.media.MediaPlayer arg0)
                 {
                     pBA.raiseEvent(ExoPlayer.this, pEventName + "_Prepared", new Object[0]);
                 }
              });
          } else {
              Log.e("B4A", "Sub Does Not Exists..." +(pEventName + "_Prepared"));
          }
          setObject(VideoView);
       }
       super.innerInitialize(pBA, pEventName, true);
    }
   
    /*
    * Sets the path to the video
    * This path can be a web address (e.g. http://) or an absolute local path (e.g. file://)
    * @param: path - The path to the video
    */
    public void SetVideoPath(String VideoPath) {
        ((EMVideoView)getObject()).setVideoPath(VideoPath);
    }
   
    /*
    * Starts or resumes playback
    */
    public void Start() {
        ((EMVideoView)getObject()).start();
    }
   
    /*
     * Enables and disables the media control overlay for the video view
     * @param: enabled - Weather the default video controls are enabled (default: false)
     */
    public void SetDefaultControlsEnabled(boolean Enabled) {
        ((EMVideoView)getObject()).setDefaultControlsEnabled(Enabled);
    }
   
}

All compiles fine and in B4A i added this:

B4X:

'DEFINE - ExoPlayer
    Dim ExoPlayer1 As ExoPlayer

'INITILIZE - ExoPlayer
    ExoPlayer1.Initialize("ExoPlayer1")

'URL - ExoPlayer
    ExoPlayer1.SetVideoPath("http://myurl.com/file.mp4")
   
    'PLAY - ExoPlayer
    ExoPlayer1.Start
   
    'ADDVIEW - ExoPlayer
    Activity.AddView(ExoPlayer1, 0, 0, 100%x, 100%y)

And in B4A Log i see:

B4X:

Sub Does Not Exists...exoplayer1_Prepared
anywheresoftware.b4a.BA@41845868...ExoPlayer1

Why above function does not trigger _Prepared event? I Defined it correctly (using example in VideoView.class wrapper and event is not fired when video start playing why?

Using this wrapper ExoPlayer sucessfully start playing video....i added setvideopath and start api, so i need to add events so that i then port all library to b4a library

Erel · May 16, 2016

The sub names passed to ba.subExists and ba.raiseEvent should be lowercased. It is also better to use raiseEventFromUI.

ronovar · May 16, 2016

Thanks Erel for replay...but i don't understand what you say.

I have:

B4X:

if (pBA.subExists(pEventName + "_Prepared")) {
 
} else {
 Log.e("B4A", "Sub Does Not Exists..." +(pEventName + "_Prepared"));
 }

And when i run in B4A this library using above example code i always get:

B4X:

Sub Does Not Exists...exoplayer1_Prepared

So the problem is that ExoPlayer1 is initialized in above public void Initialize(BA paramBA, String paramString) and when function pBA.subExists(pEventName + "_Prepared") checks (function cheks if pBA.subExists("ExoPlayer1_Prepared") exists) and it not find it....and i don't figure it why could it not find it?

in B4A i have this code:

B4X:

'PREPARED - Event
Sub ExoPlayer1_Prepared
    Log("ExoPlayer1_Prepared")   
End Sub

DonManfred · May 16, 2016

Erel said you should use LOWERCASED eventnames...

ronovar said:
pBA.raiseEvent(ExoPlayer.this, pEventName + "_Prepared", new Object[0]);

->

ronovar said:
pBA.raiseEvent(ExoPlayer.this, pEventName + "_prepared", new Object[0]);

Make sure pEventName is LOWERCASED TOO (the content, not the variablename)

B4X:

    public void Initialize(final BA ba, String EventName) {
        this.pEventName = EventName.toLowerCase(BA.cul);

ronovar · May 16, 2016

Yesss...that's true....i forget that java Prepare and prepare is not the same...now i just change to _prepare...and i see in B4A that event is called...thanks

Now i will add the other 5 events so that events is complete...will replay here when i get into problem.

(Wrapping library is very nice job when you know what do you doing )

DonManfred · May 16, 2016

In the event-definition you then can use upperlowercased names...

B4X:

@Events(values={"onSigned(sign As Object)"})

ronovar · May 16, 2016

I just use this:

B4X:

@Events(values={"prepared"})

And it works...will add to this events 5 more...

ronovar · May 16, 2016

Ok..i have now succesfully added Event: onCompleted, onError, onPrepared...all this three events in B4A works perfectly.

I could not get onInfo event to return values in B4A...all compile fine in Eclipse...in B4A i only see log from onInfo that i write in Eclipse...but onInfo from B4A is not called....why?

here is eclipse code:

B4X:

/*
          * OnInfo
          * Called to indicate an info or a warning
          */
          if (pBA.subExists(pEventName + "_oninfo")) {
Log.e("B4A", pEventName + "_oninfo1");
              VideoView.setOnInfoListener(new MediaPlayer.OnInfoListener()
              {
                    @Override
                    public boolean onInfo(MediaPlayer mp, int what, int extra)
                    {
                        String What = null;
                      switch(what) {
                          case MediaPlayer.MEDIA_INFO_UNKNOWN:
                              What = "Unspecified MediaPlayer Info";
                              break;
                          case MediaPlayer.MEDIA_INFO_VIDEO_TRACK_LAGGING:
                              What = "The Video Is Too Complex For The Decoder";
                              break;
                          case MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START:
                              What = "The Player Just Pushed The Very First Video Frame For Rendering";
                              break;
                          case MediaPlayer.MEDIA_INFO_BUFFERING_START:
                              What = "MediaPlayer Is Temporarily Pausing Playback Internally In Order To Buffer More Data";
                              break;
                          case MediaPlayer.MEDIA_INFO_BUFFERING_END:
                              What = "MediaPlayer Is Resuming Playback After Filling Buffers";
                              break;
                          case MediaPlayer.MEDIA_INFO_BAD_INTERLEAVING:
                              What = "Media Has Been Improperly Interleaved Or Not Interleaved At All";
                              break;
                          case MediaPlayer.MEDIA_INFO_NOT_SEEKABLE:
                              What = "The Media Cannot Be Seeked";
                              break;
                          case MediaPlayer.MEDIA_INFO_METADATA_UPDATE:
                              What = "A New Set Of Metadata Is Available";
                              break;
                          case MediaPlayer.MEDIA_INFO_UNSUPPORTED_SUBTITLE:
                              What = "Subtitle Track Was Not Supported By The Media Framework";
                              break;
                          case MediaPlayer.MEDIA_INFO_SUBTITLE_TIMED_OUT:
                              What = "Reading The Subtitle Track Takes Too Long";
                              break;
                          default:
                              What = "OK";
                              break;
                      }                  
                      String Extra = null;
                        pBA.raiseEvent(ExoPlayer.this, pEventName + "_oninfo", new Object[] {What, Extra});
                        return false;
                    }
                });
          }

in B4A i defined onInfo event:

B4X:

'OnInfo - Event
Sub ExoPlayer1_OnInfo(What As String, Extra As String) As Boolean
    Log("ExoPlayer1_OnInfo")
    Log(What)
    Log(Extra)
    'LIBRARY - handle event
    Return False   
End Sub

But event is not fired....i could not figure why?

Erel · May 17, 2016

1. The best way to log messages is with BA.Log.

2. I don't see any log message from the listener. This one will be logged when the listener is set, not when it fires:
Log.e("B4A", pEventName + "_oninfo1");

ronovar · May 17, 2016

I set this

B4X:

Log.e("B4A", pEventName + "_oninfo1");

To check event name if is called...and event name is called i get this in B4A log:

B4X:

exoplayer1_oninfo1

So Event _oninfo is called but does not execute next code after this Log.e("B4A", pEventName + "_oninfo1"); _oninfo is all lowercase letters and in B4A in only OnInfo Event. Could you get idea why code is not executing after Log.e?

Erel · May 17, 2016

Add a log message inside onInfo and see whether it is called.

moster67 · May 17, 2016

I don't know if it related but if ExoPlayer is using the standard onInfoListener from MediaPlayer, then beware of the fact that it requires at least API level 13

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