Android Bluetooth入力/出力ストリーム：送信済み〜1400バイト、受信済み1008

Question

2台のAndroid 4.0.1電話機間でデータを送信しようとしていますが、データを送信すると、 。

マイコード：デバッグ中

byte[] buffer = new byte[4096]; 
int bytes; 

bytes = inputStream.read(buffer); 
// bytes = 1008 
// buffer[1008..4095] = 0 
// =================== other side ============================= 
byte[] message = Tools.concatByteArray(response, authorizationMessage); 

// Debug tells me that the array has 1400 bytes 
outputStream.write(message); 
outputStream.flush(); 

メッセージは以下のとおりです。

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and for buffer: 
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だから私は、1008の最初のバイトに同じデータを取得し、その後、私はもう何も得ることはありません。

これを修正する方法はありますか？

Answer 1

バッファサイズは設定しましたか？ 通常、データがなくなるまで読み取ります。

Answer 2

私は同様のエラーを解決する必要がありました。そして関連する唯一の疑問はこのスレッドであり、まだ解決されていませんでした。だから自分自身で理由と解決策を探さなければならなかった。

なぜなら、AndroidのBluetoothは、1008バイトの束でデータを送信しているようです。 したがって、whileループでストリームから読み込み、受け取ったバイトを連結する必要があります。ここで

はあなたのコードを書き換える必要がある方法です。

byte[] buffer = new byte[4096]; 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
int bytes; 

while ((bytes = inputStream.read(buffer, 0, buffer.length)) > -1) { 
      baos.write(buffer, 0, bytes); 
      baos.flush(); 
} 
byte[] message = baos.toByteArray(); 

// =================== other side ============================= 
byte[] message = Tools.concatByteArray(response, authorizationMessage); 
outputStream.write(message); 
outputStream.flush(); 
outputStream.close(); // <-- important! so the receiver knows that it is the end of data 

Answer 3

Managing a Connection部分を確認してください。ご覧のように;

あなたはすべてのストリームの読み取りと書き込みのため 専用スレッドを使用する必要があります。これは、重要なことです。読み取り（バイト[]）と書き込み（バイト[]） のメソッドは、をブロックしているのでです。 read（byte []）は、 の何かがから読み取るまでまでブロックします。 書き込み（バイト[]）はない通常 ブロックを行いますが、リモートデバイスが十分に素早く読み取り（バイト[]）を呼び出す ではなく、中間バッファがいっぱい ある。場合は、フロー制御のためにブロックすることができますしたがって、スレッドのメインループはInputStreamから を読み込むために専用にする必要があります。

私は私のリーダースレッドをコーディング始めたとき、私はバイトの所望の数があるまで読み取り（バイト[]）InputStreamの方法が実行をブロックしますカントー。しかし、それはしません。ストリームから読み込む何かがあるまでブロックされていることを理解しました（前に逃した部分）。

あなたのパッケージは以下のとおりです。 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09あなたはOutputStream writeを介してそれを送ってフラッシュしました。 1つのread（）呼び出しで（1バイト - > 0x01さえ）の一部だけがになり、次のread（）呼び出しで残りの部分（0x02および残り）を取得することがあります。この場合、read（）の戻り値は1になり、incomingBytes [0]は0x01になり、その他の要素は0になります。