Android 蓝牙状态的监听

一、需求背景

客户在使用我公司的Flutter插件时，要求有一个蓝牙与设备重连的功能，我用公司提供的Android SDK只能实现超出和进入蓝牙范围进行重连，但是无法在蓝牙打开进行重连，这不得不让我使用Android手写一个广播监听。

二、实现步骤

添加权限

创建一个类继承 BroadcastReceiver

动态注册和注销广播

监听蓝牙状态

三、代码分享

1. 添加权限

在 AndroidManifest.xml 中添加蓝牙权限

2. 创建一个类继承 BroadcastReceiver

public class BLEStateReceiver extends BroadcastReceiver {    private static final String BLE_STATE_OFF = "android.bluetooth.BluetoothAdapter.STATE_OFF";    private static final String BLE_STATE_ON = "android.bluetooth.BluetoothAdapter.STATE_ON";    private static BLEStateReceiver receiver = new BLEStateReceiver();        public static void register(Context context) {        IntentFilter filter = new IntentFilter();        filter.setPriority(Integer.MAX_VALUE);        // 监视蓝牙关闭和打开的状态        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);        filter.addAction(BLE_STATE_OFF);        filter.addAction(BLE_STATE_ON);        context.registerReceiver(receiver, filter);    }        public static void unregister(Context context) {        context.unregisterReceiver(receiver);    }    @Override    public void onReceive(final Context context, Intent intent) {        // 检测蓝牙状态的逻辑    }}

3. 动态注册和注销广播

我这里是在 ActivityAware 的生命周期中注册的，你可以根据实际情况进行注册，只要在应用运行时注册就行。

public class MoyoungBlePlugin implements ActivityAware {        private Activity activity;    @Override    public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {        activity = binding.getActivity();        // 注册广播        BLEStateReceiver.register(activity);    }    @Override    public void onDetachedFromActivityForConfigChanges() {    }    @Override    public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding binding) {    }    @Override    public void onDetachedFromActivity() {        // 注销广播        BLEStateReceiver.unregister(activity);        activity = null;    }}

4. 监听蓝牙状态

我这里只监听了蓝牙的两种状态，如果想要监听多种状态可以查看参考。

public class BLEStateReceiver extends BroadcastReceiver {    @Override    public void onReceive(final Context context, Intent intent) {        checkBLEState(context, intent);    }        private synchronized void checkBLEState(Context context, Intent intent) {        int BLEState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);        switch (BLEState) {            case BluetoothAdapter.STATE_ON:                // 蓝牙已经打开                break;            case BluetoothAdapter.STATE_TURNING_OFF:                // 蓝牙正在关闭                break;        }    }}

四、参考文案

Android开发——蓝牙状态的监听 - 简书

Android监听蓝牙与设备连接状态、关闭和打开状态_android 蓝牙连接状态监听_MasonYyp的博客-CSDN博客

来源地址：https://blog.csdn.net/m0_68349563/article/details/130561526