android蓝牙连接已经实现了，设备之间互相发送信息怎么做？

我想知道两个设备间数据的传输需要做哪些事情，能说明下大致的框架吗?

http://download.csdn.net/detail/hyb745250618/8922395可以语音传输，也可以文字聊天

public void GetOncePswList(BluetoothGatt gatt,BluetoothGattCharacteristic characteristicRead,int flah)
{
byte[] frame = new byte[5];
frame[0] = 0x7E;
frame[1] = 0x1d;
frame[2] = 0x0;

    try
    {
        final boolean writeRequest = (mRXCharacteristic.getProperties() & BluetoothGattCharacteristic.PROPERTY_WRITE) > 0;
        if (writeRequest) { // no WRITE REQUEST property
            frame[3] = (byte)(GetCHSum(frame));
            frame[4] = 0x7E;
            mRXCharacteristic.setValue(frame);
        } else { // there is WRITE REQUEST property
            mRXCharacteristic.setValue(frame);
            mBufferOffset = frame.length;
        }
        writeCharacteristic(mRXCharacteristic);
    }
    catch (Exception ex)
    {
        Toast.makeText(this, "异常！！！", Toast.LENGTH_SHORT).show();
    }
}

可以参考google的sample：https://github.com/googlesamples/android-BluetoothChat，已经实现了通过蓝牙进行聊天的功能了。