Android 常用代码---蓝牙

1	验证是否支持蓝牙
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		// Trying to get the adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
if (btAdapter == null) {
// Bluetooth is not supported, do something here to warn the user
return;
}
2	连接至设备
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		/*
* This code is loose here but you will
* likely use it inside a thread
*
* Make sure you have the 'device' variable (BluetoothDevice)
* at the point you insert this code
*/
// UUID for your application
UUID MY_UUID = UUID.fromString("yourdata");
// Get the adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
// The socket
BluetoothSocket socket = null;
try {
// Your app UUID string (is also used by the server)
socket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) { }
// For performance reasons
btAdapter.cancelDiscovery();
try {
// Be aware that this is a blocking operation. You probably want to use this in a thread
socket.connect();
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
try {
socket.close();
} catch (IOException closeException) {
// Deal with it
}
return;
}
// Now manage your connection (in a separate thread)
myConnectionManager(socket);
3	启用蓝牙
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		/* This number is used to identify this request ("Enable Bluetooth")
* when the callback method onActivityResult() is called. Your
* interaction with the Bluetooth stack will probably start there.
*
* You probably want to insert this as a global variable
*/
int ENABLE_BLUETOOTH = 1;
// Get the adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
if (btAdapter == null) {
return;
}
// If Bluetooth is not yet enabled, enable it
if (!btAdapter.isEnabled()) {
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, ENABLE_BLUETOOTH);
// Now implement the onActivityResult() and wait for it to be invoked with ENABLE_BLUETOOTH
}
4	获取成对设备
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		// Get the adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
// Get the paired devices
Set<BluetoothDevice> devices = btAdapter.getBondedDevices();
// If there are paired devices, do whatever you're supposed to do
if (devices.size() > 0) {
for (BluetoothDevice pairedDevice : devices) {
// do something useful with the device
}
}
5	确保可检测此设备
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		//Get the adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
if (btAdapter == null) {
return;
}
// If Bluetooth is not discoverable, make it discoverable
if (btAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent makeDiscoverable = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
makeDiscoverable.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 500);
// In a real situation you would probably use startActivityForResult to get the user decision.
startActivity(makeDiscoverable);
}
6	等待传入连接
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		// UUID for your application
UUID MY_UUID = UUID.fromString("yourdata");
// SDP record name used when creating the server socket
String NAME = "BluetoothExample";
// The server socket
BluetoothServerSocket btServerSocket =  null;
// The adapter
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
// The socket
BluetoothSocket socket = null;
try {
btServerSocket = btAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
// This operation is blocking: you will wait until it returns on an error occurs
socket = btServerSocket.accept();
} catch (IOException e) { }
// Deal with it
}
if (socket != null) {
/* The connection was accepted. Do what you want to do.
* For example, get the streams
*/
InputStream inputStream = null;
OutputStream outputStream = null;
try {
inputStream = socket.getInputStream();
outputStream = socket.getOutputStream();
} catch (IOException e) {
// Deal with it
}
}
7	远程设备检测寄存器
权限		<uses-permission android:name="android.permission.BLUETOOTH"/>
代码		// Register for notification upon discovery of a Bluetooth device
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(bluetoothReceiver, intentFilter);
// Register for notification upon completion of the device discovery process
intentFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(bluetoothReceiver, intentFilter);
// BroadcastReceiver that is notified as each device is found and when the discovery
process completes
// Should be an internal class or in a separate .java file
private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// Device was discovered
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device =
intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
// device is not already paired. Do something useful here.
}
// Discovery is finished
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
// do something useful here
}
}
};