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Android app怎么通过writeCharacteristic函数写入多个字节

Callon Huang
Prodigy 100 points

我能够通过

characteristic.setValue(MySend);
mBluetoothLeService.writeCharacteristic(characteristic);

的方式写入一个字节，但是怎么同时写入20个字节呢（我的characteristic是20字节的）？好像单纯把MySend改成20个字节的byte数组是不行的