蓝牙权限问题答案

【问题标题】：Bluetooth permission issue蓝牙权限问题
【发布时间】：2022-09-27 14:43:04
【问题描述】：

我正在尝试在 android studio 和 arduino 之间建立串行通信，但我有这个致命异常。

需要 android.permission.BLUETOOTH_CONNECT 权限 android.content.AttributionSource@71c08a09：适配器服务 getBondedDevices

我在清单中添加了权限，这是我的代码：

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<manifest xmlns:android=\"http://schemas.android.com/apk/res/android\"
    xmlns:tools=\"http://schemas.android.com/tools\"
    package=\"com.example.ovo\" >


    <uses-permission android:name=\"android.permission.BLUETOOTH_CONNECT\" />
    <uses-permission android:name=\"android.permission.BLUETOOTH_SCAN\" />
    <uses-permission android:name=\"android.permission.INTERNET\" />
    <uses-permission android:name=\"android.permission.ACCESS_NETWORK_STATE\" />
    <uses-permission android:name=\"android.permission.BLUETOOTH\"
        android:maxSdkVersion=\"30\" />

    <uses-permission android:name=\"android.permission.BLUETOOTH_ADMIN\"
        android:maxSdkVersion=\"30\" />


    <application
        android:allowBackup=\"true\"
        android:dataExtractionRules=\"@xml/data_extraction_rules\"
        android:fullBackupContent=\"@xml/backup_rules\"
        android:icon=\"@drawable/ic_hojita\"
        android:label=\"@string/app_name\"
        android:roundIcon=\"@drawable/ic_hojita\"
        android:supportsRtl=\"true\"
        android:theme=\"@style/Theme.OVO\"
        tools:targetApi=\"33\" >
        <activity
            android:name=\".WifiCredentialActivity\"
            android:exported=\"true\"
            android:configChanges=\"orientation\"
            android:screenOrientation=\"portrait\"> ...

这是活动中的代码：

    package com.example.ovo
        
        import android.Manifest
        import android.bluetooth.BluetoothDevice
        import android.content.pm.PackageManager
        import android.os.Bundle
        import android.util.Log
        import android.view.WindowManager
        import android.widget.Button
        import android.widget.Toast
        import androidx.appcompat.app.AppCompatActivity
        import androidx.core.app.ActivityCompat
        import com.harrysoft.androidbluetoothserial.BluetoothManager
        import com.harrysoft.androidbluetoothserial.BluetoothSerialDevice
        import com.harrysoft.androidbluetoothserial.SimpleBluetoothDeviceInterface
        import com.harrysoft.androidbluetoothserial.SimpleBluetoothDeviceInterface.OnMessageReceivedListener
        import com.harrysoft.androidbluetoothserial.SimpleBluetoothDeviceInterface.OnMessageSentListener
        import io.reactivex.android.schedulers.AndroidSchedulers
        import io.reactivex.schedulers.Schedulers
    
    
    class WifiCredentialActivity : AppCompatActivity() {
        val bluetoothManager: BluetoothManager = BluetoothManager.getInstance()
        private var deviceInterface: SimpleBluetoothDeviceInterface? = null
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_wifi_credential)
            getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN
            )
    
            if (bluetoothManager == null) {
                // Bluetooth unavailable on this device :( tell the user
                Toast.makeText(this, \"Bluetooth not available.\", Toast.LENGTH_LONG)
                    .show() // Replace context with your context instance.
                finish()
            }
            val pairedDevices: Collection<BluetoothDevice> = bluetoothManager.pairedDevicesList
            for (device in pairedDevices) {
                if (ActivityCompat.checkSelfPermission(
                        this,
                        Manifest.permission.BLUETOOTH_CONNECT
                    ) != PackageManager.PERMISSION_GRANTED
                ) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return
                }
                Log.d(\"My Bluetooth App\", \"Device name: \" + device.name)
                Log.d(\"My Bluetooth App\", \"Device MAC Address: \" + device.address)
                // Here ill try to connect with the device
            }
    
        }
    
        private fun connectDevice(mac: String) {
            bluetoothManager.openSerialDevice(mac)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe({ connectedDevice: BluetoothSerialDevice -> onConnected(connectedDevice) }) { error: Throwable ->
                    onError(
                        error
                    )
                }
        }
    
        private fun onConnected(connectedDevice: BluetoothSerialDevice) {
            // You are now connected to this device!
            // Here you may want to retain an instance to your device:
            deviceInterface = connectedDevice.toSimpleDeviceInterface()
    
            // Listen to bluetooth events
            deviceInterface?.setListeners(
                OnMessageReceivedListener { message: String -> onMessageReceived(message) },
                OnMessageSentListener { message: String -> onMessageSent(message) },
                SimpleBluetoothDeviceInterface.OnErrorListener { error: Throwable ->
                    onError(
                        error
                    )
                })
    
            // Let\'s send a message:
            deviceInterface?.sendMessage(\"Hello world!\")
        }
    
        private fun onMessageSent(message: String) {
            // We sent a message! Handle it here.
            Toast.makeText(this, \"Sent a message! Message was: $message\", Toast.LENGTH_LONG)
                .show() // Replace context with your context instance.
        }
    
        private fun onMessageReceived(message: String) {
            // We received a message! Handle it here.
            Toast.makeText(this, \"Received a message! Message was: $message\", Toast.LENGTH_LONG)
                .show() // Replace context with your context instance.
        }
    
        private fun onError(error: Throwable) {
            // Handle the error
        }
    }

我正在使用这个库https://github.com/harry1453/android-bluetooth-serial，我的猜测是我必须调用 TODO 部分中所说的函数，但我不知道如何。

在此先感谢您，感谢您的帮助。

标签： android arduino

【解决方案1】：

<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> 是运行时权限，我希望你已经管理了它。

如果您在管理权限后仍然遇到问题，而不是将您正在使用的库作为模块导入并在该库中更改权限，因为我可以清楚地看到该库几乎已死。（3 年没有更新）。

我的建议如下：-

如果可能，请跳过使用库并自行完成该部分。
如果您不能跳过它，那么您必须通过作为模块导入来进行更改。
如果您不想更改或将其作为模块导入，您可以为您的目的找到一个替代库。

【讨论】：