Android蓝牙操作:与蓝牙串口模块通信,或其他蓝牙设备通信。
初涉android的蓝牙操作,按照固定MAC地址连接获取Device时,程序始终是异常终止,查了好多天代码都没查出原因。今天改了一下API版本,突然就成功连接了。总结之后发现果然是个坑爹之极的错误。
为了这种错误拼命查原因浪费大把时间是非常不值得的,但是问题不解决更是揪心。可惜我百度了那么多,都没有给出确切原因。今天特此mark,希望后来者遇到这个问题的时候能轻松解决。
下面是我的连接过程,中间崩溃原因及解决办法。
1:用AT指令获得蓝牙串口的MAC地址,地址是简写的,按照常理猜测可得标准格式。
2:开一个String adress= "************" //MAC地址, String MY_UUID= "************"//UUID根据通信而定,网上都有。
3:取得本地Adapter用getDefaultAdapter(); 远程的则用getRemoteDevice(adress); 之后便可用UUID开socket进行通信。
如果中途各种在getRemoteDevice处崩溃,大家可以查看一下当前的API版本,如果是2.1或以下版本的话,便能确定是API版本问题,只要换成2.2或者以上就都可以正常运行了~ 这么坑爹的错误的确很为难初学者。 唉·········· 为这种小trick浪费很多时间真是难过。
下面附上Android蓝牙操作中用固定MAC地址传输信息的模板,通用搜索模式日后再补删模板:
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
private InputStream inStream = null;
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //这条是蓝牙串口通用的UUID,不要更改
private static String address = "00:12:02:22:06:61"; // <==要连接的蓝牙设备MAC地址
/*获得通信线路过程*/
/*1:获取本地BlueToothAdapter*/
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Bluetooth is not available.", Toast.LENGTH_LONG).show();
finish();
return;
}
if(!mBluetoothAdapter.isEnabled())
{
Toast.makeText(this, "Please enable your Bluetooth and re-run this program.", Toast.LENGTH_LONG).show();
finish();
return;
}
/*2:获取远程BlueToothDevice*/
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
if(mBluetoothAdapter == null)
{
Toast.makeText(this, "Can't get remote device.", Toast.LENGTH_LONG).show();
finish();
return;
}
/*3:获得Socket*/
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Socket creation failed.", e);
}
/*4:取消discovered节省资源*/
mBluetoothAdapter.cancelDiscovery();
/*5:连接*/
try {
btSocket.connect();
Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
Log .e(TAG,"ON RESUME: Unable to close socket during connection failure", e2);
}
}
/*此时可以通信了,放在任意函数中*/
/* try {
outStream = btSocket.getOutputStream();
inStream = btSocket.getInputStream(); //可在TextView里显示
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Output stream creation failed.", e);
}
String message = "1";
byte[] msgBuffer = message.getBytes();
try {
outStream.write(msgBuffer);
} catch (IOException e) {
Log.e(TAG, "ON RESUME: Exception during write.", e);
}
*/