Android 外接设备获取驱动和获取申请权限

前言 公司要开发一个终端产品，这个产品外接了很多设备，比如：指纹、身份证识别、高拍仪等，

但是外接的设备不可以使用普通的权限申请的方式，要使用UsbManager 来进行权限的检查和权限申请。

一、UsbManager 是什么？ UsbManager 是个服务直译过来也就是Usb管理类，通过getSystemService(AppCompatActivity.USB_SERVICE) 获取实例，通过getDeviceList()函数可以获取到当前设备终端所链接的所有驱动。

二、使用步骤

1.获取UsbManager代码如下（示例）：

### 2.获取设备驱动列表

**### 3.和厂家或三方获取接入的驱动的参数

参数包括：产品ID、产品版本、产品名称、驱动ID**

val device_pid = device.productId
//供应商ID
val vendor_id = device.vendorId
//产品名称
val product_name = device.productName
//....
........

5、源码示例 这里面的判断一定要根据自己接入的驱动进行判断

import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.hardware.usb.UsbDevice
import android.hardware.usb.UsbManager
import android.os.Parcelable
import androidx.appcompat.app.AppCompatActivity
import com.example.idrdemo.IDCardUtil
import me.hgj.jetpackmvvm.ext.util.loge
 
 
object UsbPermission {
 
    var vid = -1
    var pid = -1
 
    private var ACTION_USB_PERMISSION = ""
 
    private val usbMgrReceiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            val action = intent.action
            "权限注册$action   >>  $ACTION_USB_PERMISSION >>> $pid".loge()
            if (ACTION_USB_PERMISSION == action) {
                val device =
                    intent.getParcelableExtra<Parcelable>(UsbManager.EXTRA_DEVICE) as UsbDevice?
                if (device!!.vendorId == vid && device.productId == pid) {
                    if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                        "权限注册成功".loge()
                        getManPer(context)
                    } else {
                        "权限注册失败".loge()
                        getManPer(context)
                    }
                }
            } else if (UsbManager.ACTION_USB_DEVICE_ATTACHED == action) {
                val device =
                    intent.getParcelableExtra<Parcelable>(UsbManager.EXTRA_DEVICE) as UsbDevice?
                if (device!!.vendorId == vid && device.productId == pid) {
                    "权限注册成功222".loge()
                }
            } else if (UsbManager.ACTION_USB_DEVICE_DETACHED == action) {
                val device =
                    intent.getParcelableExtra<Parcelable>(UsbManager.EXTRA_DEVICE) as UsbDevice?
                if (device!!.vendorId == vid && device.productId == pid) {
                    "权限注册成功移除了驱动".loge()
                    ToastUtils.showLong("驱动被移除了$ACTION_USB_PERMISSION")
                }
            }
        }
    }
 
 
    private var usbDevice: UsbDevice? = null
 
    fun getManPer(activity: Context) { 
        val usbManager = activity.getSystemService(AppCompatActivity.USB_SERVICE) as UsbManager
        for (device in usbManager.deviceList.values) {
            val device_pid = device.productId
            val vendor_id = device.vendorId
            val productName = device.productName
 //这里面的判断一定要根据自己接入的驱动进行判断
            when {
                vendor_id == 6997 && !usbManager.hasPermission(device) -> {
                     usbDevice = device
                } 
 //这判断有可能会出现两个驱动的 vendor_id 相等，才加的产品名称判断
                vendor_id == 7119 && productName?.contains("JSK-RGB") == true && !usbManager.hasPermission(
                    device
                ) -> {
                     usbDevice = device
                }
            }
        }
 
        getPre(activity, usbManager)
 
    }
 
 
    private fun getPre(activity: Context, usbManager: UsbManager) {
        if (null == usbDevice) return
        
        usbDevice?.let {
            if (!usbManager.hasPermission(it)  ) {
                vid = it.vendorId
                pid = it.productId
                ACTION_USB_PERMISSION = "$vid-$pid"
                val filter = IntentFilter()
                filter.addAction(ACTION_USB_PERMISSION)
                filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED)
                filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED)
                activity.registerReceiver(usbMgrReceiver, filter)
 
                val intent = Intent(ACTION_USB_PERMISSION)
                val pendingIntent = PendingIntent.getBroadcast(activity, 0, intent, 0)
                usbManager.requestPermission(it, pendingIntent)
 
            }
        }
 
    }
 
}

总结 上面就是对UsbManager处理的标签