近期项目中需要连接蓝牙设备,起初只是设置蓝牙列表界面让用户点击然后输入默认PIN码,后来改需求了 = = ,要求自动连接指定设备并不需要用户手动输入PIN码,作为Android 小白的我是拒绝的,但是拒绝有什么用~
首先说一下之后会用到的关于蓝牙方面的东西:
- 断开蓝牙已配对的设备
- 搜索附近蓝牙设备
- 拦截用户交互页面,使用代码输入
- 由于在最后连接的时候使用的是设备的SDK所以在这里就不介绍了
1.断开已配对设备
最后在项目中发现没有用。这里就先记录一下。
//得到配对的设备列表,清除已配对的设备public void removePairDevice() {if (mBluetoothAdapter != null) {//mBluetoothAdapter初始化方式 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();//这个就是获取已配对蓝牙列表的方法Set<BluetoothDevice> bondedDevices = mBluetoothAdapter.getBondedDevices();for (BluetoothDevice device : bondedDevices) {//这里可以通过device.getName() device.getAddress()来判断是否是自己需要断开的设备unpairDevice(device);}}}//反射来调用BluetoothDevice.removeBond取消设备的配对private void unpairDevice(BluetoothDevice device) {try {Method m = device.getClass().getMethod("removeBond", (Class[]) null);m.invoke(device, (Object[]) null);} catch (Exception e) {Log.e("mate", e.getMessage());}}
2.搜索附近蓝牙
首先我们需要注册两个广播,第一个为正在搜索时的,第二个为搜索完成的。
// Register for broadcasts when a device is discoveredIntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);this.registerReceiver(mFindBlueToothReceiver, filter);// Register for broadcasts when discovery has finishedfilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);this.registerReceiver(mFindBlueToothReceiver, filter);//需要时开始搜索if (mBluetoothAdapter.isDiscovering()) {mBluetoothAdapter.cancelDiscovery();}mBluetoothAdapter.startDiscovery();
然后对广播进行处理。这里要说明一下ClsUtils.createBond()这个方法如果连接设备SDK中有配对的方法,建议把这个方法去掉,我这里是去掉的,加上的话偶尔会Toast出无法配对。
private final BroadcastReceiver mFindBlueToothReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();// When discovery finds a deviceif (BluetoothDevice.ACTION_FOUND.equals(action)) {//TODO 开始搜索BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);// if (device.getBondState() != BluetoothDevice.BOND_BONDED) {//判断蓝牙状态,是否是已配对//TODO 可以在这判断名字 如果搜索结束后没有,再到已配对中寻找String BTName[] = device.getName().split("-");if (BTName[0].equals("xxx")) {//在这连接设备 一般需要蓝牙地址 device.getAddress();try {ClsUtils.createBond(device.getClass(), device);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}// }} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {//TODO 搜索结束Toast.makeText(context, "搜索结束",Toast.LENGTH_SHORT).show();}}};
这里在Activity结束时记得取消注册和取消搜索
unregisterReceiver(mFindBlueToothReceiver);if (mBluetoothAdapter != null) {mBluetoothAdapter.cancelDiscovery();}
3.拦截用户交互页面
通过广播可以监听到输入PIN码的那个页面将要弹出
<receiver android:name=".BluetoothConnectActivityReceiver" ><intent-filter android:priority="1000"><action android:name="android.bluetooth.device.action.PAIRING_REQUEST" /></intent-filter></receiver>
广播中需要做的事情,注意一定要调用abortBroadcast(),不然交互页面还是会出现一下然后消失。就是这个方法找了一天(╯‵□′)╯︵┴─┴。。。
public class BluetoothConnectActivityReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if (intent.getAction().equals("android.bluetooth.device.action.PAIRING_REQUEST")) {BluetoothDevice mBluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);try {//(三星)4.3版本测试手机还是会弹出用户交互页面(闪一下),如果不注释掉下面这句页面不会取消但可以配对成功。(中兴,魅族4(Flyme 6))5.1版本手机两中情况下都正常//ClsUtils.setPairingConfirmation(mBluetoothDevice.getClass(), mBluetoothDevice, true);abortBroadcast();//如果没有将广播终止,则会出现一个一闪而过的配对框。//3.调用setPin方法进行配对...boolean ret = ClsUtils.setPin(mBluetoothDevice.getClass(), mBluetoothDevice, "你需要设置的PIN码");} catch (Exception e) {e.printStackTrace();}}}
}
然后只要在搜索到自己需要的设备后连接进行操作就可以了!!!一定要记得加权限~
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /><uses-permission android:name="android.permission.BLUETOOTH" />
在Android6.0之后还需要一个模糊定位的权限
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
最后把ClsUtils类奉上,网上有很多的。
/**************** 蓝牙配对函数 ***************/import java.lang.reflect.Field;
import java.lang.reflect.Method;import android.bluetooth.BluetoothDevice;
import android.util.Log;public class ClsUtils {/*** 与设备配对 参考源码:platform/packages/apps/Settings.git* /Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java*/static public boolean createBond(Class btClass, BluetoothDevice btDevice) throws Exception {Method createBondMethod = btClass.getMethod("createBond");Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);return returnValue.booleanValue();}/*** 与设备解除配对 参考源码:platform/packages/apps/Settings.git* /Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java*/static public boolean removeBond(Class<?> btClass, BluetoothDevice btDevice) throws Exception {Method removeBondMethod = btClass.getMethod("removeBond");Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);return returnValue.booleanValue();}static public boolean setPin(Class<? extends BluetoothDevice> btClass, BluetoothDevice btDevice, String str) throws Exception {try {Method removeBondMethod = btClass.getDeclaredMethod("setPin", new Class[]{byte[].class});Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice,new Object[]{str.getBytes()});Log.e("returnValue", "" + returnValue);} catch (SecurityException e) {// throw new RuntimeException(e.getMessage());e.printStackTrace();} catch (IllegalArgumentException e) {// throw new RuntimeException(e.getMessage());e.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return true;}// 取消用户输入static public boolean cancelPairingUserInput(Class<?> btClass, BluetoothDevice device) throws Exception {Method createBondMethod = btClass.getMethod("cancelPairingUserInput");
// cancelBondProcess(btClass, device);Boolean returnValue = (Boolean) createBondMethod.invoke(device);return returnValue.booleanValue();}// 取消配对static public boolean cancelBondProcess(Class<?> btClass, BluetoothDevice device) throws Exception {Method createBondMethod = btClass.getMethod("cancelBondProcess");Boolean returnValue = (Boolean) createBondMethod.invoke(device);return returnValue.booleanValue();}//确认配对static public void setPairingConfirmation(Class<?> btClass, BluetoothDevice device, boolean isConfirm) throws Exception {Method setPairingConfirmation = btClass.getDeclaredMethod("setPairingConfirmation", boolean.class);setPairingConfirmation.invoke(device, isConfirm);}/**** @param clsShow*/static public void printAllInform(Class clsShow) {try {// 取得所有方法Method[] hideMethod = clsShow.getMethods();int i = 0;for (; i < hideMethod.length; i++) {Log.e("method name", hideMethod[i].getName() + ";and the i is:"+ i);}// 取得所有常量Field[] allFields = clsShow.getFields();for (i = 0; i < allFields.length; i++) {Log.e("Field name", allFields[i].getName());}} catch (SecurityException e) {// throw new RuntimeException(e.getMessage());e.printStackTrace();} catch (IllegalArgumentException e) {// throw new RuntimeException(e.getMessage());e.printStackTrace();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}
}
文章最后提供两篇促使我写这篇文章的背后资源╮( ̄▽ ̄)╭。
Markdown新手指南
Android蓝牙自动配对Demo,亲测好使!!!
第一次写文章,不知道会是什么效果,我的第一次就这么出去了o(〃'▽'〃)o。