Android蓝牙聊天应用权限问题求助：DeviceListActivity权限报错

问题原因 #

在Android 12（API 31）及更高版本中，调用BluetoothAdapter.getBondedDevices()、BluetoothDevice.getName()和BluetoothDevice.getAddress()需要BLUETOOTH_CONNECT权限，你的代码仅在MainActivity中检查了位置权限，未针对该蓝牙权限做显式校验，导致触发权限安全警告。

解决方案 #

1. 在DeviceListActivity中添加权限检查逻辑 #

修改DeviceListActivity.java，在获取配对设备前先校验BLUETOOTH_CONNECT权限，并处理权限请求结果：

package com.example.bluetoothchatapp;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.Set;

public class DeviceListActivity extends AppCompatActivity {
    private ListView listPairedDevices, listAvailableDevices;
    private ArrayAdapter<String> adapterPairedDevices;
    private ArrayAdapter<String> adapterAvailableDevices;
    private static final int REQUEST_BLUETOOTH_CONNECT = 102;
    private Context context;
    private BluetoothAdapter bluetoothAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_device_list);
        context = this;
        initViews();
        checkBluetoothConnectPermission();
    }

    private void initViews() {
        listAvailableDevices = findViewById(R.id.list_available_devices);
        listPairedDevices = findViewById(R.id.list_paired_devices);

        adapterAvailableDevices = new ArrayAdapter<>(context, R.layout.device_list_item);
        adapterPairedDevices = new ArrayAdapter<>(context, R.layout.device_list_item);

        listPairedDevices.setAdapter(adapterPairedDevices);
        listAvailableDevices.setAdapter(adapterAvailableDevices); // 修正原代码重复设置适配器的错误
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    }

    private void checkBluetoothConnectPermission() {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.BLUETOOTH_CONNECT}, REQUEST_BLUETOOTH_CONNECT);
        } else {
            loadPairedDevices();
        }
    }

    private void loadPairedDevices() {
        if (bluetoothAdapter == null) return;
        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
        if (pairedDevices != null && pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                String deviceInfo = device.getName() + "\n" + device.getAddress();
                adapterPairedDevices.add(deviceInfo);
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_BLUETOOTH_CONNECT) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                loadPairedDevices();
            }
        }
    }
}

2. 优化MainActivity的权限检查（可选） #

为了在进入DeviceListActivity前确保所有必要权限已获取，可修改MainActivity的checkPermissions方法，同时请求位置权限和BLUETOOTH_CONNECT权限：

private void checkPermissions(){
    String[] requiredPermissions = {
        Manifest.permission.ACCESS_FINE_LOCATION,
        Manifest.permission.BLUETOOTH_CONNECT
    };
    boolean allGranted = true;
    for(String perm : requiredPermissions){
        if(ContextCompat.checkSelfPermission(context, perm) != PackageManager.PERMISSION_GRANTED){
            allGranted = false;
            break;
        }
    }
    if(!allGranted){
        ActivityCompat.requestPermissions(MainActivity.this, requiredPermissions, REQUEST_LOCATION_PERMISSION);
    }
    else{
        Intent intent = new Intent(context, DeviceListActivity.class);
        startActivity(intent);
    }
}

关键说明 #

• Android 12+将蓝牙权限拆分为BLUETOOTH_SCAN、BLUETOOTH_CONNECT、BLUETOOTH_ADVERTISE三个细分权限，不同操作对应不同权限要求
• 获取已配对设备信息、访问设备名称/地址属于蓝牙连接相关操作，必须校验BLUETOOTH_CONNECT权限

内容的提问来源于stack exchange，提问作者Akash Soam