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Android Bluetooth 文件接收路径修改方法

2024-10-19 10:51:02   228人阅读

修改文件：

packages/apps/Bluetooth/src/com/android/bluetooth/opp/BluetoothOppReceiveFileInfo.java

 

相关代码片段：

 

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public static BluetoothOppReceiveFileInfo generateFileInfo(Context context, int id) {
 
    ContentResolver contentResolver = context.getContentResolver();
    Uri contentUri = Uri.parse(BluetoothShare.CONTENT_URI + "/" + id);
    String filename = null, hint = null, mimeType = null;
    long length = 0;
    Cursor metadataCursor = null;
    try {
        metadataCursor = contentResolver.query(contentUri, new String[] {
            BluetoothShare.FILENAME_HINT, BluetoothShare.TOTAL_BYTES, BluetoothShare.MIMETYPE
            }, null, null, null);
    } catch (SQLiteException e) {
        if (metadataCursor != null) {
            metadataCursor.close();
        }
        metadataCursor = null;
        Log.e(Constants.TAG, "generateFileInfo: " + e);
    } catch (CursorWindowAllocationException e) {
        metadataCursor = null;
        Log.e(Constants.TAG, "generateFileInfo: " + e);
    }
 
    if (metadataCursor != null) {
        try {
            if (metadataCursor.moveToFirst()) {
                hint = metadataCursor.getString(0);
                length = metadataCursor.getLong(1);
                mimeType = metadataCursor.getString(2);
            }
        } finally {
            metadataCursor.close();
            if (V) Log.v(Constants.TAG, "Freeing cursor: " + metadataCursor);
            metadataCursor = null;
        }
    }
 
    File base = null;
    StatFs stat = null;
 
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        String root = Environment.getExternalStorageDirectory().getPath();
        base = new File(root + Constants.DEFAULT_STORE_SUBDIR);
        if (!base.isDirectory() && !base.mkdir()) {
            if (D) Log.d(Constants.TAG, "Receive File aborted - can‘t create base directory "
                        + base.getPath());
            return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
        }
        stat = new StatFs(base.getPath());
    } else {
        if (D) Log.d(Constants.TAG, "Receive File aborted - no external storage");
        return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_ERROR_NO_SDCARD);
    }
 
    /*
     * Check whether there‘s enough space on the target filesystem to save
     * the file. Put a bit of margin (in case creating the file grows the
     * system by a few blocks).
     */
    if (stat.getBlockSize() * ((long)stat.getAvailableBlocks() - 4) < length) {
        if (D) Log.d(Constants.TAG, "Receive File aborted - not enough free space");
        return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_ERROR_SDCARD_FULL);
    }
 
    filename = choosefilename(hint);
    if (filename == null) {
        // should not happen. It must be pre-rejected
        return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
    }
    String extension = null;
    int dotIndex = filename.lastIndexOf(".");
    if (dotIndex < 0) {
        if (mimeType == null) {
            // should not happen. It must be pre-rejected
            return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
        } else {
            extension = "";
        }
    } else {
        extension = filename.substring(dotIndex);
        filename = filename.substring(0, dotIndex);
    }
 
    if ((filename != null) && (filename.getBytes().length > OPP_LENGTH_OF_FILE_NAME)) {
      /* Including extn of the file, Linux supports 255 character as a maximum length of the
       * file name to be created. Hence, Instead of sending OBEX_HTTP_INTERNAL_ERROR,
       * as a response, truncate the length of the file name and save it. This check majorly
       * helps in the case of vcard, where Phone book app supports contact name to be saved
       * more than 255 characters, But the server rejects the card just because the length of
       * vcf file name received exceeds 255 Characters.
       */
      try {
          byte[] oldfilename = filename.getBytes("UTF-8");
          byte[] newfilename = new byte[OPP_LENGTH_OF_FILE_NAME];
          System.arraycopy(oldfilename, 0, newfilename, 0, OPP_LENGTH_OF_FILE_NAME);
          filename = new String(newfilename, "UTF-8");
      } catch (UnsupportedEncodingException e) {
          Log.e(Constants.TAG, "Exception: " + e);
      }
      if (D) Log.d(Constants.TAG, "File name is too long. Name is truncated as: " + filename);
    }
 
    filename = base.getPath() + File.separator + filename;
    // Generate a unique filename, create the file, return it.
    String fullfilename = chooseUniquefilename(filename, extension);
 
    if (!safeCanonicalPath(fullfilename)) {
        // If this second check fails, then we better reject the transfer
        return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
    }
    if (V) Log.v(Constants.TAG, "Generated received filename " + fullfilename);
 
    if (fullfilename != null) {
        try {
            new FileOutputStream(fullfilename).close();
            int index = fullfilename.lastIndexOf(‘/‘) + 1;
            // update display name
            if (index > 0) {
                String displayName = fullfilename.substring(index);
                if (V) Log.v(Constants.TAG, "New display name " + displayName);
                ContentValues updateValues = new ContentValues();
                updateValues.put(BluetoothShare.FILENAME_HINT, displayName);
                context.getContentResolver().update(contentUri, updateValues, null, null);
 
            }
            return new BluetoothOppReceiveFileInfo(fullfilename, length, new FileOutputStream(
                    fullfilename), 0);
        } catch (IOException e) {
            if (D) Log.e(Constants.TAG, "Error when creating file " + fullfilename);
            return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
        }
    } else {
        return new BluetoothOppReceiveFileInfo(BluetoothShare.STATUS_FILE_ERROR);
    }
 
}
 
private static boolean safeCanonicalPath(String uniqueFileName) {
    try {
        File receiveFile = new File(uniqueFileName);
        if (sDesiredStoragePath == null) {
            sDesiredStoragePath = Environment.getExternalStorageDirectory().getPath() +
                Constants.DEFAULT_STORE_SUBDIR;
        }
        String canonicalPath = receiveFile.getCanonicalPath();
 
        // Check if canonical path is complete - case sensitive-wise
        if (!canonicalPath.startsWith(sDesiredStoragePath)) {
            return false;
        }
 
        return true;
    } catch (IOException ioe) {
        // If an exception is thrown, there might be something wrong with the file.
        return false;
    }
}

 

修改方法：

root 就是存储的根目录。

如果需要将其修改之外部存储，修改此处的赋值即可。

如果需要修改子目录，修改base的拼接赋值即可。

 

此处修改需要注意，如果修改root或者base，则需要给sDesiredStoragePath重新赋值，使其一致，否则会导致safeCanonicalPath()判断会失败。
需要使完整的路径合法，否则无法接收文件。

 

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Android Bluetooth 文件接收路径修改方法


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