USB选择PTP功能时，如何同时显示内置、外置SD卡内容

一、highlight
Android中，PTP只支援Primary Storage...
You could refer to the comments of MtpService.java file
// In PTP mode we support only primary storage 二、如需修改，请自行参考如下修改：
\alps\frameworks\base\core\java\android\os\Environment.java
1.
public static String DIRECTORY_SD2_PICTURES = "Pictures";    //add. for PTP two disk.
public static String DIRECTORY_SD2_DCIM = "DCIM";    //add. for PTP two disk.
\alps\packages\providers\MediaProvider\src\com\android\providers\media\MtpService.java
2.
//add for two PTP disk. start.
private static final String[] PTP_DIRECTORIES_SD2 = new String[] {
        Environment.DIRECTORY_SD2_DCIM,
        Environment.DIRECTORY_SD2_PICTURES,
    };
//add for two PTP disk. end. 3.
    private void addStorageDevicesLocked() {
        /*if (mPtpMode) {
            // In PTP mode we support only primary storage
            final StorageVolume primary = StorageManager.getPrimaryVolume(mVolumes);
            final String path = primary.getPath();
            if (path != null) {
                String state = mStorageManager.getVolumeState(path);
                if (Environment.MEDIA_MOUNTED.equals(state)) {
                    addStorageLocked(mVolumeMap.get(path));
                }
            }
        } else cancelled. for PTP two disk. */{
            for (StorageVolume volume : mVolumeMap.values()) {
                addStorageLocked(volume);
            }
        }
    } 4. JB\KK版本
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        synchronized (mBinder) {
            updateDisabledStateLocked();
   isUsbConfigured = (intent == null ? false
    :intent.getBooleanExtra(UsbManager.USB_CONFIGURED, false));             mPtpMode = (intent == null ? false
                    : intent.getBooleanExtra(UsbManager.USB_FUNCTION_PTP, false));
            String[] subdirs = null;
            if (mPtpMode) {
                int count = PTP_DIRECTORIES.length;
    //add by dayu
    int count2 = PTP_DIRECTORIES_SD2.length;
                subdirs = new String[count+count2];
                for (int i = 0; i < count; i++) {
                    File file =
                            Environment.getExternalStoragePublicDirectory(PTP_DIRECTORIES[i]);
                    // make sure this directory exists
                    file.mkdirs();
                    subdirs[i] = file.getPath();
                }
                String secondary_storage = null;
                if (mVolumes != null)
              for (StorageVolume volume : mVolumes)
               if(!volume.isPrimary()) {
                secondary_storage = volume.getPath();
                Log.d(TAG, "secondary_storage="+secondary_storage);
     break;
               }
                for (int i = count; i < count+count2; i++) {
                    File file = new File(secondary_storage,PTP_DIRECTORIES_SD2[i-count]);
                    Log.d(TAG, "filePath="+file.getPath());
                    // make sure this directory exists
                    file.mkdirs();
                    subdirs[i] = file.getPath();
                }             }
   /*Fix ALPS00444854
        MtpService process is killed by VOLD when user plug out SD card(USB will disconnect)
     ActivityManager: Scheduling restart of crashed service com.android.providers.media/.MtpService in 5000ms
        before new a Mtpserver, it need to check if USB is already connected and configure
        to avoid open mtp driver twice
        if MTP can transfer via WIFI, BT ...., must fix this
   */
   if(isUsbConfigured){
            final StorageVolume primary = StorageManager.getPrimaryVolume(mVolumes);
            mDatabase = new MtpDatabase(this, MediaProvider.EXTERNAL_VOLUME,
                    primary.getPath(), subdirs);
            manageServiceLocked();
   }
        }         return START_STICKY;
    } L版本基本同上面，只是有两处修改需要注意，请参考语句标注： import android.net.Uri; //wqtao.add.

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
synchronized (mBinder) {
updateDisabledStateLocked();
mIsUsbConfigured = (intent == null ? false : intent.getBooleanExtra(UsbManager.USB_CONFIGURED, false));
mPtpMode = (intent == null ? false : intent.getBooleanExtra(UsbManager.USB_FUNCTION_PTP, false));
String[] subdirs = null;
if (mPtpMode) {
int count = PTP_DIRECTORIES.length;
int count2 = PTP_DIRECTORIES_SD2.length; //add.
subdirs = new String[count+count2];
for (int i = 0; i < count; i++) {
File file = Environment.getExternalStoragePublicDirectory(PTP_DIRECTORIES[i]);
// make sure this directory exists
file.mkdirs();
subdirs[i] = file.getPath();
}

//add start.
String secondary_storage=null;
if(mVolumes!=null){
for(StorageVolume volume:mVolumes)
if(!volume.isPrimary()){
secondary_storage=volume.getPath();
Log.e(TAG, "secondary_storage="+secondary_storage);
break;
}
for (int i = count; i < count+count2; i++) {
File file = new File(secondary_storage, PTP_DIRECTORIES_SD2[i-count]);
Log.e(TAG, "filePath="+file.getPath());
if(file.mkdirs()) //修改此行
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file))); //增加此行
subdirs[i]=file.getPath();
}
}
//add end.
}
/*Fix ALPS00444854
MtpService process is killed by VOLD when user plug out SD card(USB will disconnect)
ActivityManager: Scheduling restart of crashed service com.android.providers.media/.MtpService in 5000ms
before new a Mtpserver, it need to check if USB is already connected and configure
to avoid open mtp driver twice
if MTP can transfer via WIFI, BT ...., must fix this
*/
if (mIsUsbConfigured) {
final StorageVolume primary = StorageManager.getPrimaryVolume(mVolumes);
if (mDatabase != null) {
mDatabase.setServer(null);
}
mDatabase = new MtpDatabase(this, MediaProvider.EXTERNAL_VOLUME, primary.getPath(), subdirs);
manageServiceLocked();
}
}

return START_STICKY;
} 5.
    private void volumeMountedLocked(String path) {
        // Add for update Storage
        StorageVolume[] volumes = mStorageManager.getVolumeList();
        mVolumes = volumes;
        // Add for update Storage
        for (int i = 0; i < mVolumes.length; i++) {
            StorageVolume volume = mVolumes[i];
            if (volume.getPath().equals(path)) {
                mVolumeMap.put(path, volume);
                if (!mMtpDisabled) {
                    // In PTP mode we support only primary storage
                    /*if (volume.isPrimary() || !mPtpMode)   cancelled. for PTP two disk. */{
                        addStorageLocked(volume);
                    }
                }
                break;
            }
        }
    }

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