Android Studio 基础之获取蓝牙Bluetooth 的状态，设置的蓝牙Bluetooth 的开关状态，并监听蓝牙Bluetooth 的状态变化方法整理

川长思鸟来 2022-11-29 13:16 886阅读 0赞

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# Android Studio 基础 之 获取蓝牙Bluetooth 的状态，设置的蓝牙Bluetooth 的开关状态，并监听蓝牙Bluetooth 的状态变化方法整理 #

**目录**

Android Studio 基础 之 获取蓝牙Bluetooth 的状态，设置的蓝牙Bluetooth 的开关状态，并监听蓝牙Bluetooth 的状态变化方法整理

一、简单介绍

二、实现原理

三、注意事项

四、效果预览

五、实现步骤

六、关键代码

--------------------

## 一、简单介绍 ##

Android 开发中的一些基础操作，使用整理，便于后期使用。

本节介绍，Android 开发中，获取手机设备的蓝牙Bluetooth的状态，并设置蓝牙Bluetooth开关，监听蓝牙Bluetooth的状态变化，方法不唯一，欢迎指正。

## 二、实现原理 ##

1、获取蓝牙适配器 BluetoothAdapter.getDefaultAdapter()

2、bluetoothAdapter.isEnabled() 获取蓝牙的状态

3、bluetoothAdapter.enable()/bluetoothAdapter.disable() 设置蓝牙开关状态

4、使用广播监听 BluetoothAdapter.ACTION\_STATE\_CHANGED 蓝牙状态变化

## 三、注意事项 ##

1、添加蓝牙权限

> <uses-permission android:name="android.permission.BLUETOOTH"/>
> 
> <uses-permission android:name="android.permission.BLUETOOTH\_ADMIN"/>

## 四、效果预览 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70][]

## 五、实现步骤 ##

1、打开 Android Studio 新建一个工程，或者新建一个模块

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 1][]

2、默认操作，一路创建一个模块

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 4][]

3、创建一个 BluetoothUtil，编写获取蓝牙状态，设置蓝牙状态，和监听蓝牙状态变化的方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 5][]

4、MainActivity ，测试 BluetoothUtil 封装的方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 6][]

5、打包，在设备上测试，效果如上

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 7][]

## 六、关键代码 ##

1、BluetoothUtil

package com.example.bluetoothtest;
    
    import android.bluetooth.BluetoothAdapter;
    import android.bluetooth.BluetoothDevice;
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.util.Log;
    import android.widget.Toast;
    
    public class BluetoothUtil {
    
        private static final String TAG = "Main";
    
        private BluetoothAdapter bluetoothAdapter;
        private BluetoothStateBroadcastReceive mReceive;
    
        public BluetoothUtil() {
            // 获得蓝牙适配器对象
            bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        }
    
        public boolean getBlueToothState() {
            // 获取蓝牙状态
            return bluetoothAdapter.isEnabled();
        }
    
        public boolean openBlueTooth() {
            if (getBlueToothState()) return true;
            // 打开蓝牙
            return bluetoothAdapter.enable();
        }
    
        public boolean colseBlueTooth() {
            if (!getBlueToothState()) return true;
            // 关闭蓝牙
            return bluetoothAdapter.disable();
        }
    
        // 调用系统的请求打开蓝牙
        public void gotoSystem(Context context){
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            context.startActivity(intent);
        }
    
        public void registerBluetoothReceiver(Context context){
            if(mReceive == null){
                mReceive = new BluetoothStateBroadcastReceive();
            }
            IntentFilter intentFilter = new IntentFilter();
            intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
            intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
            intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
            intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_OFF");
            intentFilter.addAction("android.bluetooth.BluetoothAdapter.STATE_ON");
            context.registerReceiver(mReceive, intentFilter);
        }
    
        public void unregisterBluetoothReceiver(Context context){
            if(mReceive != null){
                context.unregisterReceiver(mReceive);
                mReceive = null;
            }
        }
    
        class BluetoothStateBroadcastReceive extends BroadcastReceiver {
    
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                switch (action){
                    case BluetoothDevice.ACTION_ACL_CONNECTED:
                        Toast.makeText(context , "蓝牙设备:" + device.getName() + "已连接", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"蓝牙设备:" + device.getName() + "已连接");
                        break;
                    case BluetoothDevice.ACTION_ACL_DISCONNECTED:
                        Toast.makeText(context , "蓝牙设备:" + device.getName() + "已断开", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"蓝牙设备:" + device.getName() + "已断开");
                        break;
                    case BluetoothAdapter.ACTION_STATE_CHANGED:
                        int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
                        switch (blueState){
                            case BluetoothAdapter.STATE_OFF:
                                Toast.makeText(context , "蓝牙已关闭", Toast.LENGTH_SHORT).show();
                                Log.i(TAG, "onReceive: "+"蓝牙已关闭:" );
                                break;
                            case BluetoothAdapter.STATE_ON:
                                Toast.makeText(context , "蓝牙已开启"  , Toast.LENGTH_SHORT).show();
                                Log.i(TAG, "onReceive: "+"蓝牙已开启:");
                                break;
                        }
                        break;
                }
            }
        }
    }

2、MainActivity

package com.example.bluetoothtest;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    
    public class MainActivity extends AppCompatActivity {
    
        private  static  final  String TAG = "MainActivity";
    
        BluetoothUtil _BluetoothUtil;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            _BluetoothUtil = new BluetoothUtil();
            _BluetoothUtil.registerBluetoothReceiver(this);
            Log.i(TAG, "onCreate: BT State : "+ _BluetoothUtil.getBlueToothState());
            _BluetoothUtil.colseBlueTooth();
            Log.i(TAG, "onCreate: BT State : "+ _BluetoothUtil.getBlueToothState());
            _BluetoothUtil.openBlueTooth();
            //_BluetoothUtil.gotoSystem(this);
            Log.i(TAG, "onCreate: BT State : "+ _BluetoothUtil.getBlueToothState());
        }
    
        @Override
        protected void onDestroy() {
    
            _BluetoothUtil.unregisterBluetoothReceiver(this);
            super.onDestroy();
        }
    }

3、AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.bluetoothtest">
    
        <uses-permission android:name="android.permission.BLUETOOTH"/>
        <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

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