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Android蓝牙操作笔记,android蓝牙笔记
蓝牙是一种支持设备短距离传输数据的无线技术。android在2.0以后提供了这方面的支持。
从查找蓝牙设备到能够相互通信要经过几个基本步骤(本机做为服务器):
1.设置权限
在manifest中配置
- <uses-permission android:name="android.permission.BLUETOOTH"/>
- <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
2.启动蓝牙
首先要查看本机是否支持蓝牙,获取BluetoothAdapter蓝牙适配器对象
- BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
- if(mBluetoothAdapter == null){
- //表明此手机不支持蓝牙
- return;
- }
- if(!mBluetoothAdapter.isEnabled()){ //蓝牙未开启,则开启蓝牙
- Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
- startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
- }
- //......
- public void onActivityResult(int requestCode, int resultCode, Intent data){
- if(requestCode == REQUEST_ENABLE_BT){
- if(requestCode == RESULT_OK){
- //蓝牙已经开启
- }
- }
- }
3。发现蓝牙设备
这里可以细分为几个方面
(1)使本机蓝牙处于可见(即处于易被搜索到状态),便于其他设备发现本机蓝牙
- //使本机蓝牙在300秒内可被搜索
- private void ensureDiscoverable() {
- if (mBluetoothAdapter.getScanMode() !=
- BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
- Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
- discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
- startActivity(discoverableIntent);
- }
- }
(2)查找已经配对的蓝牙设备,即以前已经配对过的设备
- Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
- if (pairedDevices.size() > 0) {
- findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
- for (BluetoothDevice device : pairedDevices) {
- //device.getName() +" "+ device.getAddress());
- }
- } else {
- mPairedDevicesArrayAdapter.add("没有找到已匹对的设备");
- }
(3)通过mBluetoothAdapter.startDiscovery();搜索设备,要获得此搜索的结果需要注册
一个BroadcastReceiver来获取。先注册再获取信息,然后处理
- //注册,当一个设备被发现时调用onReceive
- IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
- this.registerReceiver(mReceiver, filter);
- //当搜索结束后调用onReceive
- filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
- this.registerReceiver(mReceiver, filter);
- //.......
- private BroadcastReceiver mReceiver = new BroadcastReceiver() {
- @Override
- public void onReceive(Context context, Intent intent) {
- String action = intent.getAction();
- if(BluetoothDevice.ACTION_FOUND.equals(action)){
- BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
- // 已经配对的则跳过
- if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
- mNewDevicesArrayAdapter.add(device.getN