質問編集履歴
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ソースコード掲載
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@@ -1,2 +1,102 @@
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今AndroidとPCとをBluetoothで接続しファイルの送受信を行うプログラムを書いています。
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しかし、送信するデータが大きすぎるとうまく受信できないようです。質問なのですがBluetoothでは一度にデータを送受信できる限界値があるのでしょうか?
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2
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しかし、送信するデータが大きすぎるとうまく受信できないようです。質問なのですがBluetoothでは一度にデータを送受信できる限界値があるのでしょうか?
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3
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4
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送信側(PC)プログラム
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5
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```Java
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//選択したファイルの情報をまとめる
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7
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StringBuilder builder = new StringBuilder();
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8
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for (File file : fileList) {
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builder.append(file.getName());
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builder.append(FILE_SEPARATOR);
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builder.append(file.length());
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builder.append(DATA_SEPARATOR);
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}
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sessionTools.getController().appendToConsole("Send file info:" + builder.toString());
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String encodedMessage = URLEncoder.encode(builder.toString(), "UTF-8");
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BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(sessionTools.getOutputStream()));
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bufferedWriter.write(encodedMessage);
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bufferedWriter.newLine();
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bufferedWriter.flush();
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BufferedOutputStream outputStream = new BufferedOutputStream(sessionTools.getOutputStream());
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for (File file : fileList) {
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sessionTools.getController().initProgressBar(String.format("%sを送信", file.getName()), 0);
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byte[] data = readFile(file);
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int sum = data.length;
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int divide = 1024;
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int divisionCount = sum / divide;
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int remainder = sum % divide;
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if (divisionCount < 1) {
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outputStream.write(data);
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outputStream.flush();
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} else {
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for (int index = 0; index < divisionCount; index++) {
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outputStream.write(data, index * divide, divide);
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outputStream.flush();
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double percentage = (double) (index * divide) / sum;
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sessionTools.getController().updateProgress(String.format("%sを送信中 %d %%", file.getName(), (int) (percentage * 100)), percentage);
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}
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if (remainder > 0) {
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outputStream.write(data, sum - remainder, remainder);
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outputStream.flush();
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}
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sessionTools.getController().finishedProgress(String.format("%s送信完了", file.getName()));
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sessionTools.getController().appendToConsole("Send " + file.getName());
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}
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}
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```
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受信側(Android)プログラム
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57
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```Java
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//ファイル情報をもとにデータを受信
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//ファイル情報を取得
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BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(sessionTools.getInputStream()));
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String msg = bufferedReader.readLine();
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msg = URLDecoder.decode(msg, "UTF-8");
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if(msg.equals(CANCEL_MESSAGE)){
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exception = new Exception("サーバがファイル送信コマンドをキャンセルしました");
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return -1;
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}
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//ファイル情報を解析してMapに入れる
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String[] fileDatas = msg.split(DATA_SEPARATOR);
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for(String fileData : fileDatas){
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String fileName = fileData.split(FILE_SEPARATOR)[0];
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int size = Integer.parseInt(fileData.split(FILE_SEPARATOR)[1]);
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fileMap.put(fileName, size);
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}
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byte[] dataBuffer = new byte[BUFFER_SIZE];
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BufferedInputStream bufferedInputStream = new BufferedInputStream(sessionTools.getInputStream());
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for(String fileName: fileMap.keySet()){
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ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
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int dataSize = fileMap.get(fileName);
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int current = 0;
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while ((len = bufferedInputStream.read(dataBuffer)) != -1) {
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if (dataSize - current < BUFFER_SIZE) {
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byte[] tempBuffer = new byte[dataSize - current];
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len = bufferedInputStream.read(tempBuffer);
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byteArrayOutputStream.write(tempBuffer, 0, len);
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break;
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} else {
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byteArrayOutputStream.write(dataBuffer, 0, len);
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current += len;
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}
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double percentage = ((double)current / dataSize) * 100;
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publishProgress((int)percentage);
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}
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byteArrayOutputStream.flush();
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saveFile(fileName, byteArrayOutputStream.toByteArray());
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publishProgress(100);
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}
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102
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```
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