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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
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
五、实现步骤
1、打开 Android Studio 新建一个工程，或者新建一个模块
2、默认操作，一路创建一个模块
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
4、MainActivity ，测试 BluetoothUtil 封装的方法
5、打包，在设备上测试，效果如上
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>
本文地址：https://blog.csdn.net/u014361280/article/details/108150955
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