android - Android-从没有android.permission.WRITE_EXTERNAL_STORAGE的 Assets 中播放声音

Question

对于用Adobe AIR编写的游戏，当我们在Android上显示本地或推送通知时，我们希望游戏中的声音之一成为通知声音。

目前，我们有以下解决方案，我们对此并不满意，因为它需要额外的Android权限，而我们确实认为这是不必要的。基本上，您传递 Assets 路径，例如位于根“assets”文件夹中的“audio / core / reward.mp3”，然后在Android端，将文件拉出到InputStream中，并将其写入文件在外部存储设备上，Android的MediaPlayer从那里开始播放。

显然，当您在Android上播放文件时，这一定不是AIR所做的，因为您不需要“WRITE_EXTERNAL_STORAGE”来播放声音，因此对于我们来说，当应用程序当前未在积极运行时，会出现推送通知在其中，我将如何播放在AS3方面打包和使用的文件？

推荐的方法是

    MediaPlayer m = new MediaPlayer();
    AssetFileDescriptor afd = context.getAssets().openFd(soundPath);
    m.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
    m.prepare();
    m.setVolume(1f, 1f);
    m.start();
    playSound = false;

但这不适用于错误

 java.io.FileNotFoundException: This file can not be opened as a file descriptor; it is probably compressed

所以我需要做一个不受欢迎的方法，

public static void HandleMessage(Context context, CharSequence title, CharSequence message, String soundPath)
{
    log("HandleMessage (message: '" + message + "', title: '" + title +"', icon: " + Extension.getIcon(context) + ", class: " + Extension.getEntryClass(context));
    long when = System.currentTimeMillis();

    NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    Intent notificationIntent = new Intent(context, Extension.getEntryClass(context));

    PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);

    Notification notification = new NotificationCompat.Builder(context)
        .setContentText(message)
        .setContentIntent(contentIntent)
        .setTicker(message)
        .setSmallIcon(Extension.getIcon(context))
        .setWhen(when)
        .setAutoCancel(true)
        .setVibrate(new long[] { 1000, 400 })
        .build();

    Boolean playSound = true;
    if(null != soundPath && "" != soundPath)
    {
        try {
            MediaPlayer m = new MediaPlayer();
            String newPath = checkWriteFile(context, soundPath);
            log(newPath);
            if(null != newPath)
            {
                m.setDataSource(newPath);
                m.prepare();
                m.setVolume(1f, 1f);
                m.start();
                playSound = false;
            }
        } catch (IOException e) {
            log(e.getLocalizedMessage());
            e.printStackTrace();
        }
    }
    if(playSound)
    {
        notification.sound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    }

    nm.notify(NotifId, notification);

    NotifId++;
}

public static String checkWriteFile(Context context, String relPath)
{
    Boolean exists = false;
    String newPath = null;
    String fullPath = Environment.getExternalStorageDirectory().getPath() + "/" + context.getPackageName() + "/temp/" + relPath;
    int index = fullPath.lastIndexOf("/") + 1;
    String file = fullPath.substring(index);
    String path = fullPath.substring(0, index);
    log(relPath + ", " + fullPath + ", " + (new File(fullPath)).exists());

    if (!(new File(fullPath)).exists()) {
        try {
            byte[] buffer = null;
            InputStream fIn = context.getAssets().open(relPath);
            log("InputStream: " + fIn);

            int size=0;

            try {
                size = fIn.available();
                buffer = new byte[size];
                fIn.read(buffer);
                fIn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            exists = (new File(path)).exists();
            if (!exists) {
                new File(path).mkdirs();
            }

            FileOutputStream save;
            try {
                save = new FileOutputStream(path + file);
                save.write(buffer);
                save.flush();
                save.close();
                newPath = fullPath;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        catch (Exception e) {
            log(e.getLocalizedMessage());
            e.printStackTrace();
        }
    }
    else {
        newPath = fullPath;
    }

    return newPath;
}

Answer 1

如果要避免使用android.permission.WRITE_EXTERNAL_STORAGE，可以将文件提取到内部存储中，而不是外部。

String fullPath = Environment.getExternalStorageDirectory() (...)

可以替换为

String fullPath = context.getFilesDir() (...)