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Android 4.0.4 WebView MediaPlayer Error (1, -2147483648) Using <audio> Tag File and Local Assets

I am new to Android and trying to get HTML5 <audio> to work in the WebView browser, but keep getting MediaPlayer error (1, -2147483648). The file I'm trying to play is located below the "assets" directory. I tried to reference the file in the "res / raw" directory, but with the same result.

To make sure that the files can be found and played back, as part of my tests, I created a code variation in which the sound will be launched through <a> and processed by WebViewClient using the following sentences:

Android: playing sound using WebView

It worked (although I had to trim the leading file: /// android_asset "from the URL), but using anchors is not how I want the pages to work. I want the background sound to play when the page opens, but others sounds were triggered through Javascript when certain <div> tags, I read elsewhere that Android now supports tags, but I had no luck with them and I use the latest version of the SDK.

I created a test page with strips to experiment, the details of which are given below. I was looking for a solution for a solution with no luck. I don’t know what is missing (I prefer to avoid any add-ons, if possible, and work with Android alone).

Asset catalog layout

assets
 > audio
   > a-00099954.mp3
   > a-00099954.ogg
 > image
 > script
 > style
 > video
 audioTest.html

Java code

package com.test.audiotag;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;

public class MainActivity extends Activity
{
    private WebView localBrowser;

   @Override
   public void onCreate(Bundle savedInstanceState)
   {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       localBrowser = (WebView)findViewById(R.id.localbrowser);
       localBrowser.getSettings().setJavaScriptEnabled(true);
       localBrowser.loadUrl("file:///android_asset/audioTest.html");
   }
}

manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android      ="http://schemas.android.com/apk/res/android"
          package            ="com.test.audiotag"
          android:versionCode="1"
          android:versionName="1.0">
    <uses-sdk android:minSdkVersion="14" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name             =".MainActivity"
                  android:label            ="@string/app_name"
                  android:screenOrientation="portrait">
            <intent-filter>
                <action   android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

HTML page

<!DOCTYPE html>
<html>
<head>
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
   <meta name="viewport" content="width=300, height=400">
   <style type="text/css">
    #centre_all
    {
       -webkit-box-flex  : 0;
       position          : relative;
       background-color  : #D0D000;
       border            : 2px dotted red;
       -webkit-box-shadow: 0 0 5px red;
    }
   </style>
</head>
<body>
   <div id="centre_all" style="width:300px;height:400px;">
     <audio controls="controls" autoplay="autoplay">
        <source src="audio/a-00099954.mp3" type="audio/mpeg" />
        <source src="audio/a-00099954.ogg" type="audio/ogg"/>
        &#160;
     </audio>
   </div>
</body>
</html>
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, , "assets" (-, MediaPlayer ) , . :

http://developer.android.com/guide/topics/data/data-storage.html

:

  • [ /data/data/your.package.name/files; . context.getFilesDir()]
  • [ /mnt/sdcard/Android/data/_//; . context.getExternalFilesDir(null)]
  • [ /mnt/sdcard/temp; . Environment.getExternalStorageDirectory() + "/temp" ]

"" , MediaPlayer . () , " " " " . , , , . ; , . : Android, , HTML Chrome, Android.

Java

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    localBrowser = (WebView)findViewById(R.id.localbrowser);
    localBrowser.getSettings().setJavaScriptEnabled(true);
    localBrowser.setWebViewClient(new WebViewClient());
    localBrowser.setWebChromeClient(new WebChromeClient());
    ...

    Context context  = localBrowser.getContext();
    File    filesDir = context.getFilesDir();
    Log.d("FILE PATH", filesDir.getAbsolutePath());
    if (filesDir.exists())
    {
        filesDir.setReadable(true, false);
        try
        {
            String[] audioFiles = context.getAssets().list("audio");
            if (audioFiles != null)
            {
                byte[]           buffer;
                int              length;
                InputStream      inStream;
                FileOutputStream outStream;
                for (int i=0; i<audioFiles.length; i++)
                {
                    inStream  = context.getAssets().open(
                                "audio/" + audioFiles[i] );
                    outStream = context.openFileOutput(audioFiles[i],
                                        Context.MODE_WORLD_READABLE);
                    buffer    = new byte[8192];
                    while ((length=inStream.read(buffer)) > 0)
                    {
                        outStream.write(buffer, 0, length);
                    }
                    // Close the streams
                    inStream.close();
                    outStream.flush();
                    outStream.close();
                }
            }
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    // Feedback
    String[] fileList = context().fileList();
    Log.d("FILE LIST",  "--------------");
    for (String fileName : fileList)
    {
        Log.d("- FILE", fileName);
    }

    ...
}

HTML-

   <div id="centre_all" style="width:300px;height:400px;">
     <audio controls="controls" autoplay="autoplay">
        <source src="/data/data/com.test.audiotag/files/a-00099954.mp3" type="audio/mpeg" />
        <source src="audio/a-00099954.mp3" type="audio/mpeg" />
        &#160;
     </audio>
   </div>

onDestroy() , "/mnt/sdcard/temp", , ( "onStop" () "" onPause() ", , ). " onDestroy()", , , :

http://developer.android.com/reference/android/app/Activity.html#onDestroy()

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Java

private String[] audioList;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    localBrowser = (WebView)findViewById(R.id.localbrowser);
    localBrowser.getSettings().setJavaScriptEnabled(true);
    localBrowser.setWebViewClient(new WebViewClient());
    localBrowser.setWebChromeClient(new WebChromeClient());
    ...

    Context context = localBrowser.getContext();
    File    dirRoot = new File(Environment.getExternalStorageDirectory().toString());
    Log.d("ROOT DIR PATH", dirRoot.getAbsolutePath());
    if (dirRoot.exists())
    {
        File dirTemp = new File(dirRoot.getAbsolutePath() + "/temp");
        if (!dirTemp.exists())
        {
            if (!dirTemp.mkdir())
            {
                Log.e("AUDIO DIR PATH", "FAILED TO CREATE " +
                                        dirTemp.getAbsolutePath());
            }
        }
        else
        {
            Log.d("AUDIO DIR PATH", dirTemp.getAbsolutePath());
        }
        if (dirTemp.exists())
        {
            dirTemp.setReadable(true, false);
            dirTemp.setWritable(true);
            try
            {
                String[] audioFiles = context.getAssets().list("audio");
                if (audioFiles != null)
                {
                    byte[]           buffer;
                    int              length;
                    InputStream      inStream;
                    FileOutputStream outStream;

                    audioList = new String[audioFiles.length];
                    for (int i=0; i<audioFiles.length; i++)
                    {
                        inStream     = context.getAssets().open(
                                       "audio/" + audioFiles[i] );
                        audioList[i] = dirTemp.getAbsolutePath() + "/" +
                                       audioFiles[i];
                        outStream    = new FileOutputStream(audioList[i]);
                        buffer       = new byte[8192];
                        while ( (length=inStream.read(buffer)) > 0)
                        {
                            outStream.write(buffer, 0, length);
                        }
                        // Close the streams
                        inStream.close();
                        outStream.flush();
                        outStream.close();
                        //audioFile = new File(audioList[i]);
                        //audioFile.deleteOnExit();
                    }
                }
            }
            catch (Exception e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        // Feedback
        String[] fileList = dirTemp.list();
        Log.d("FILE LIST",  "--------------");
        for (String fileName : fileList)
        {
            Log.d("- FILE", fileName);
        }
    }

    ...
}   // onCreate()

@Override
public void onDestroy()
{
    for (String audioFile : audioList)
    {
        File hFile = new File(audioFile);
        if (hFile.delete())
        {
            Log.d("DELETE FILE", audioFile);
        }
        else
        {
            Log.d("DELETE FILE FAILED", audioFile);
        }
    }
    super.onDestroy();
}   // onDestroy()

HTML-

   <div id="centre_all" style="width:300px;height:400px;">
     <audio controls="controls" autoplay="autoplay">
        <source src="/mnt/sdcard/temp/a-00099954.mp3" type="audio/mpeg" />
        <source src="audio/a-00099954.mp3" type="audio/mpeg" />
        &#160;
     </audio>
   </div>

, , , , . , Android , ; "context.getExternalFilesDir(null)" "context.getExternalFilesDir(Environment.DIRECTORY_MUSIC)", "/mnt/sdcard/Android/data/package_name/files/Music".

, . -, , , . -, MediaPlayer , , , . , :

Android: WebView

, , Javascript , , , Android Java, MediaPlayer ( ).

+5

- , . /mnt/sdCARD.

+1

Brute Force

, , -, . , , , HTML (.. - ), . , Vimeo ( ), "autoplay" uri WebView. , , , " " . ( , ), , , WebView. JS ( : Android Webview DOM -?:

    mWebView.setWebViewClient(new CustomVimeoViewClient(){

            @Override
            public void onPageFinished(WebView view, String url) {
                    super.onPageFinished(view, url);
                    String injection = injectPageMonitor();
                    if(injection != null) {
                        Log.d(TAG, "  Injecting . . .");
                        view.loadUrl(injection);
                    }
                    Log.d(TAG, "Page is loaded");
            }
    }

JS , . jQuery - , , , ( JavaScript?):

    private String injectPageMonitor() {
    return( "javascript:" +
        "function eventFire(el, etype){ if (el.fireEvent) { (el.fireEvent('on' + etype)); } else { var evObj = document.createEvent('Events'); evObj.initEvent(etype, true, false); el.dispatchEvent(evObj); }}" +
        "eventFire(document.querySelectorAll('.some_class_or_another')[0], 'click');";
    }

And as long as I already tell you about embarrassing things, I will end up confessing that I use Chrome to poke on third-party pages to find things that I want to use in this way. Since there are no developer tools on Android, I am setting up the UserAgent described here http://www.technipages.com/google-chrome-change-user-agent-string.html . Then I buy coffee (a liquid, not a Rails Gem), and poke other people’s code that is harmful.

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