Android Studio 之蓝牙串口通信（SPP）

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撰写不易，记下笔记，全是干货源码：

一、先创建一个空project

• 选择Empty Activity，然后Next

• 
  

  选择工程位置与项目名称，然后点Finsh即可

二、设计布局activity_main.xml（如下）

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/text1" android:layout_width="0dp" android:layout_height="wrap_content" android:textSize="20dp" android:text="本地蓝牙设备：" app:layout_constraintEnd_toStartOf="@+id/guideline2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="10dp"/> <TextView android:id="@+id/text2" android:layout_width="0dp" android:layout_height="wrap_content" android:textSize="20dp" android:text="设备名称" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="@+id/guideline2" app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="10dp"/> <androidx.constraintlayout.widget.Guideline android:id="@+id/guideline2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" app:layout_constraintGuide_begin="205dp"/> <Button android:id="@+id/button_open" android:layout_width="0dp" android:layout_height="wrap_content" android:text="打开蓝牙" android:textSize="20dp" app:layout_constraintEnd_toStartOf="@id/guideline2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/text1" /> <Button android:id="@+id/button_close" android:layout_width="0dp" android:layout_height="wrap_content" android:text="关闭蓝牙" android:textSize="20dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="@id/guideline2" app:layout_constraintTop_toBottomOf="@id/text2"/> <Button android:id="@+id/button_search" android:layout_width="0dp" android:layout_height="wrap_content" android:text="搜索蓝牙设备" android:textSize="20dp" app:layout_constraintEnd_toStartOf="@+id/guideline2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/button_open" /> <Button android:id="@+id/button_check" android:layout_width="0dp" android:layout_height="wrap_content" android:text="已绑定设备" android:textSize="20dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="@+id/guideline2" app:layout_constraintTop_toBottomOf="@+id/button_close" /> <ListView android:id="@+id/listview1" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView" /> <TextView android:id="@+id/textView" android:layout_width="0dp" android:layout_height="wrap_content" android:background="#6D91AE" android:gravity="center" android:text="蓝牙列表" android:textSize="25dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/button_search" /> </androidx.constraintlayout.widget.ConstraintLayout>

三、再新建一个Empty Activity，作为连接后跳转的界面（命名为send_and_receive或自定义命名）

四、设计布局activity_send_and_receive.xml（如下）

<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Send_and_receive"> <TextView android:id="@+id/textView_ble" android:layout_width="wrap_content" android:layout_height="0dp" android:gravity="fill_vertical" android:text="蓝牙状态：" android:textSize="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <TextView android:id="@+id/textView_ble_connect" android:layout_width="wrap_content" android:layout_height="0dp" android:layout_marginStart="70dp" android:gravity="fill_vertical" android:text="已连接" android:textColor="#3F51B5" android:textSize="20dp" app:layout_constraintStart_toEndOf="@+id/textView_ble" app:layout_constraintTop_toTopOf="parent" /> <ListView android:id="@+id/listView_receive" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toTopOf="@+id/textView_send" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.538" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView_receive" /> <TextView android:id="@+id/textView_receive" android:layout_width="0dp" android:layout_height="wrap_content" android:background="#6D91AE" android:gravity="center" android:text="接收区" android:textSize="24sp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/textView_ble" /> <TextView android:id="@+id/textView_send" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#6D91AE" android:gravity="center" android:text="发送区" android:textSize="24sp" app:layout_constraintBottom_toTopOf="@+id/editText_send" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintStart_toStartOf="parent" /> <EditText android:id="@+id/editText_send" android:layout_width="0dp" android:layout_height="50dp" android:ems="10" android:inputType="textPersonName" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toStartOf="@+id/button_send" app:layout_constraintStart_toStartOf="parent" /> <Button android:id="@+id/button_send" android:layout_width="100dp" android:layout_height="50dp" android:text="发送" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="@+id/editText_send" /> </androidx.constraintlayout.widget.ConstraintLayout>

五、在res文件下新建一个文件命名为menu，而后在该文件下新建一个菜单栏menu1.xml

六、menu1.xml菜单设计

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/menu_button_connect" android:title="连接蓝牙设备"/> <item android:id="@+id/menu_button_disconnect" android:title="断开蓝牙设备"/> <item android:id="@+id/menu_button_return" android:title="返回上一页"/> <item android:id="@+id/menu_button_clean" android:title="清除数据"/> </menu>

七、AndroidMainfest.xml文件中添加权限申请（如下）

<!-- 添加权限 --> <!-- 允许应用程序使用本机设备的蓝牙功能 --> <uses-permission android:name="android.permission.BLUETOOTH" /> <!-- 允许应用程序对蓝牙进行发现和配对，注：安装12新增的蓝牙权限 --> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <!-- 定位权限，蓝牙搜索需要 --> <uses-permission android:name="android.permission.BLUETOOTH_SCAN" /> <!-- 允许应用程序连接到蓝牙设备 --> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <!-- 允许应用程序启用蓝牙广播功能 --> <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> <!-- 应用程序需访问设备的精准地理位置 --> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- 应用程序需访问设备的粗略地理位置 --> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

八、新建一个蓝牙适配器类BluetoothController.java

代码如下：

package com.example.ble_0426; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.content.Intent; import android.util.Log; import java.lang.reflect.Method; import java.util.ArrayList; / *蓝牙控制器 */ public class BluetoothController { //成员变量 private BluetoothAdapter mAdapter; private BluetoothSocket btSocket; private String TAG = ""; String bluetoothName; / * 构造函数 */ public BluetoothController() { //获取本地的蓝牙适配器 mAdapter =BluetoothAdapter.getDefaultAdapter(); } / *获取本机蓝牙名称 */ public String getBluetoothName() { bluetoothName = mAdapter.getName(); return bluetoothName; } / * 打开蓝牙 */ public void turnOnBlueTooth(Activity activity, int requestCode) { if (!mAdapter.isEnabled()) { Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); activity.startActivityForResult(intent, requestCode); } else return; } / * 关闭蓝牙 */ public void turnOffBlueTooth() { if (mAdapter.isEnabled()) { mAdapter.disable(); } } / * 根据蓝牙地址找到相应的设备 */ public BluetoothDevice find_device(String addr) { return mAdapter.getRemoteDevice(addr); } / *停止搜索设备 */ public void cancelSearch() { mAdapter.cancelDiscovery(); } / * 搜索蓝牙设备 */ public boolean searchBle() { assert (mAdapter !=null); if (mAdapter.isDiscovering()) { mAdapter.cancelDiscovery(); return false; } else { return mAdapter.startDiscovery(); } } / * 查看已绑定的蓝牙设备 */ public ArrayList<BluetoothDevice> getBleDeviceList() { return new ArrayList<BluetoothDevice>(mAdapter.getBondedDevices()); } } 

九、MainActivity.java代码如下：

package com.example.ble_0426; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import android.Manifest; 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.os.Build; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { //蓝牙权限列表 public ArrayList<String> requestList = new ArrayList<>(); //常量 private static final int REQ_PERMISSION_CODE = 1; //实例化蓝牙控制器 public BluetoothController btController = new BluetoothController(); //弹窗 private Toast mToast; //定义一个列表，存蓝牙设备地址，用于显示 public ArrayList<String> deviceName = new ArrayList<>(); //定义一个列表，存储蓝牙设备的地址 public ArrayList<String> arrayList = new ArrayList<>(); //定义一个适配器，用于刷新列表更新 public ArrayAdapter adapter1; //搜索蓝牙广播 private IntentFilter foundFilter; / * 搜索蓝牙广播，将搜索到的蓝牙名称和地址添加到列表上 */ private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (BluetoothDevice.ACTION_FOUND.equals(action)) { String label; BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); if (device.getBondState() == 12) { label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n"; } else if (device.getBondState() == 10) { label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n"; } else { label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n"; } if (!deviceName.contains(label)) { deviceName.add(label); //将搜索到的设备添加到列表上 arrayList.add(device.getAddress()); //将搜索到的蓝牙地址添加到列表上 adapter1.notifyDataSetChanged(); //更新 } } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) { showToast("搜索结束"); unregisterReceiver(this); } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) { showToast("开始搜索"); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //显示本机蓝牙名称 TextView textView_name = (TextView) findViewById(R.id.text2); textView_name.setText(btController.getBluetoothName()); //蓝牙状态改变信息 IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED); //搜索蓝牙广播 foundFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND); foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); //实例化ArrayAdapter adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1,deviceName); //通过id获取ListView组件 ListView listView = (ListView) findViewById(R.id.listview1); //添加到LisView组件中 listView.setAdapter(adapter1); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { CharSequence content = ((TextView) view).getText(); String con = content.toString(); String[] conArray = con.split("\n"); String rightStr = conArray[1].substring(5,conArray[1].length()); BluetoothDevice device = btController.find_device(rightStr); if (device.getBondState() == 10) { btController.cancelSearch(); String label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n"; deviceName.remove(label); device.createBond(); label = "设备名：" + device.getName() +"\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n"; deviceName.add(label); adapter1.notifyDataSetChanged(); showToast("配对："+device.getName()); } else { btController.cancelSearch(); String label = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n"; if (deviceName.contains(label)) { Intent intent = new Intent(MainActivity.this,Send_and_receive.class); Bundle bundle = new Bundle(); bundle.putString("deviceAddr", device.getAddress()); intent.putExtras(bundle); startActivity(intent); finish(); } } } }); //自动打开蓝牙 openBle(); / * 手动打开蓝牙 */ //通过id获取“打开蓝牙”按钮 Button button_open = (Button) findViewById(R.id.button_open); //绑定按钮点击事件处理函数 button_open.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { openBle(); } }); / * 关闭蓝牙 */ //通过id获取“关闭蓝牙”按钮 Button button_close = (Button) findViewById(R.id.button_close); //绑定按钮点击事件处理函数 button_close.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { closeBle(); } }); / * 搜索蓝牙设备 */ //通过id获取”搜索蓝牙设备“按钮 Button button_search = (Button) findViewById(R.id.button_search); //绑定按钮点击事件处理函数 button_search.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getPermision(); //获取蓝牙权限 registerReceiver(bluetoothReceiver,foundFilter); //注册广播 //初始化各个列表 arrayList.clear(); deviceName.clear(); adapter1.notifyDataSetChanged(); //更新 btController.searchBle(); } }); / * 查看已绑定设备 */ //通过id获取”已绑定设备“按钮 Button button_check = (Button) findViewById(R.id.button_check); //绑定按钮点击事件处理函数 button_check.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getPermision(); //获取蓝牙权限 //初始化各个列表 arrayList.clear(); deviceName.clear(); adapter1.notifyDataSetChanged(); //更新 //获取已绑定的蓝牙设备 ArrayList<BluetoothDevice> bluetoothDevices = btController.getBleDeviceList(); //更新列表 for (int i = 0; i < bluetoothDevices.size(); i++) { BluetoothDevice device = bluetoothDevices.get(i); arrayList.add(device.getAddress()); if (device.getBondState() == 12) { deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n"); } else if (device.getBondState() == 10) { deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n"); } else { deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n"); } adapter1.notifyDataSetChanged(); } } }); } / * 打开蓝牙 */ public void openBle() { getPermision(); //蓝牙权限 btController.turnOnBlueTooth(this,1); } / * 关闭蓝牙 */ public void closeBle() { getPermision(); //蓝牙权限 btController.turnOffBlueTooth(); } / * 动态申请权限 */ public void getPermision() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) { requestList.add(Manifest.permission.BLUETOOTH); requestList.add(Manifest.permission.BLUETOOTH_SCAN); requestList.add(Manifest.permission.BLUETOOTH_ADVERTISE); requestList.add(Manifest.permission.BLUETOOTH_CONNECT); requestList.add(Manifest.permission.ACCESS_FINE_LOCATION); requestList.add(Manifest.permission.ACCESS_COARSE_LOCATION); } if(requestList.size() != 0) { ActivityCompat.requestPermissions(this,requestList.toArray(new String[0]),REQ_PERMISSION_CODE); } } / * 弹窗 */ public void showToast(String text) { if (mToast == null) { //初始化 mToast = Toast.makeText(this,text,Toast.LENGTH_SHORT); } else { //修改显示文本 mToast.setText(text); } //显示 mToast.show(); } }

十、Send_and receive.java代码如下：

package com.example.ble_0426; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import android.Manifest; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.content.Intent; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.charset.StandardCharsets; import java.util.ArrayList; import java.util.UUID; public class Send_and_receive extends AppCompatActivity { //蓝牙权限列表 public ArrayList<String> requestList = new ArrayList<>(); //常量 private static final int REQ_PERMISSION_CODE = 1; //弹窗 private Toast mToast; //蓝牙服务 private BluetoothSocket bluetoothSocket; //实例化BleConnect private BleConnect bleConnect = new BleConnect(); //实例化蓝牙适配器类 public BluetoothController mController = new BluetoothController(); //文本输入框 public EditText editText; //接收区 public ListView listView; //蓝牙状态文本显示 public TextView text; //消息列表 public ArrayList<String> listMessage = new ArrayList<>(); //定义适配器 public ArrayAdapter adapter1; //活动间消息传递 public Handler mHandler; //读取数据线程 public readMessage readmessage = new readMessage(); private Bundle bundle; public Button button_send; public Menu button_return; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_send_and_receive); //获取intent Intent intent = getIntent(); //获取intent传来的数据 bundle = intent.getExtras(); //连接服务 bleConnect.connectDevice(mController.find_device(bundle.getString("deviceAddr"))); //线程服务开始 bleConnect.start(); //文本输入框 editText = (EditText) findViewById(R.id.editText_send); //接收区 listView = (ListView) findViewById(R.id.listView_receive); //设置返回界面 button_return = (Menu) findViewById(R.id.menu_button_return); //蓝牙状态文本显示 text = (TextView) findViewById(R.id.textView_ble_connect); //实例化ArrayAdapter adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1,listMessage); //设置listView listView.setAdapter(adapter1); // 实例化Handler mHandler = new Handler(Looper.myLooper()) { @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); switch (msg.what) { case 1: String s = msg.obj.toString(); listMessage.add("接收数据：" + s); adapter1.notifyDataSetChanged(); break; } } }; / * 发送按钮 */ //通过id获取“发送”按钮 button_send = (Button) findViewById(R.id.button_send); //绑定按钮点击事件处理函数 button_send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String message = editText.getText().toString(); if (message.length() != 0) { sendMessage(message); listMessage.add("发送数据：" + message + "\n"); adapter1.notifyDataSetChanged(); } } }); } / * 读取数据 */ private class readMessage extends Thread { private static final String TAG = ""; public void run() { super.run(); byte[] buffer = new byte[1024]; int bytes; InputStream inputStream = null; try { inputStream = bluetoothSocket.getInputStream(); } catch (IOException e1) { e1.printStackTrace(); } while (true) { try { if ((bytes = inputStream.read(buffer)) > 0) { byte[] buf_data = new byte[bytes]; for (int i = 0; i < bytes; i++) { buf_data[i] = buffer[i]; } String text = new String(buf_data, 0, bytes, "utf-8"); //接收的值inputstream 为 text Message message = Message.obtain(); message.what = 1; message.obj = text; mHandler.sendMessage(message); if (text.equalsIgnoreCase("o")) { //o表示opend showToast("open"); } else if (text.equalsIgnoreCase("c")) { //c表示close showToast("close"); } } } catch (IOException e) { try { inputStream.close(); } catch (IOException e1) { e1.printStackTrace(); } break; } } } } / * 发送数据 */ public void sendMessage(String label) { getPermision(); //获取权限 if (bluetoothSocket == null) { showToast("没有连接"); return; } try { OutputStream os = bluetoothSocket.getOutputStream(); os.write(label.getBytes()); //发送出去的值为：label } catch (IOException e) { e.printStackTrace(); } } / * 连接蓝牙 */ private class BleConnect extends Thread { private void connectDevice(BluetoothDevice device) { try { getPermision(); bluetoothSocket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); //蓝牙串口服务UUID（SPP） bluetoothSocket.connect(); readmessage.start(); showToast("蓝牙连接成功"); } catch (IOException e) { e.printStackTrace(); showToast("蓝牙连接失败"); } } } / * 断开蓝牙 */ public void disConnect() { try { bluetoothSocket.close(); bluetoothSocket = null; button_send.setEnabled(false); showToast("蓝牙断开"); text.setText("已断开"); } catch (IOException e) { e.printStackTrace(); } } / *菜单栏 */ public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu1,menu); return true; } public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_button_connect: //连接蓝牙，还未写 break; case R.id.menu_button_disconnect: //断开蓝牙 getPermision(); disConnect(); break; case R.id.menu_button_return: //返回上一页 Intent intent = new Intent(Send_and_receive.this,MainActivity.class); startActivity(intent); break; case R.id.menu_button_clean: //清除数据 adapter1.clear(); break; default: } return true; } / * 动态申请权限 */ public void getPermision() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) { requestList.add(Manifest.permission.BLUETOOTH); requestList.add(Manifest.permission.BLUETOOTH_SCAN); requestList.add(Manifest.permission.BLUETOOTH_ADVERTISE); requestList.add(Manifest.permission.BLUETOOTH_CONNECT); requestList.add(Manifest.permission.ACCESS_FINE_LOCATION); requestList.add(Manifest.permission.ACCESS_COARSE_LOCATION); } if(requestList.size() != 0) { ActivityCompat.requestPermissions(this,requestList.toArray(new String[0]),REQ_PERMISSION_CODE); } } / * 弹窗 */ public void showToast(String text) { if (mToast == null) { //初始化 mToast = Toast.makeText(this,text,Toast.LENGTH_SHORT); } else { //修改显示文本 mToast.setText(text); } //显示 mToast.show(); } }

注：若上方代码有不理解的可一起在评论区讨论

效果运行如下：