Android Bluetooth 文件接收路径修改方法

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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