第一：請求權限和請求權限回調(通過廣播回調)

注冊一個廣播接收器用于接收USB權限被同意或拒絕后發出的廣播

//注冊USB設備權限管理廣播

IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION); //ACTION_USB_PERMISSION為自定義的字符串

context.registerReceiver(usbReceiver, filter);

其中usbReceiver的實現是：

private BroadcastReceiver usbReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

final String action = intent.getAction();

if(action.equals(ACTION_USB_PERMISSION)){//ACTION_USB_PERMISSION是前面我們自己自定義的字符串

UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);

if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {

if (device != null) {

LogUtils.i("已獲取USB權限");

}

} else {

LogUtils.i("USB權限被拒絕");

}

};

請求權限：

PendingIntent mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);//關于這個mPermissionIntent ，具體的作用我還沒弄明白，明白以后補充

manager = (UsbManager) context.getSystemService(Context.USB_SERVICE);

manager.requestPermission(device,mPermissionIntent);//device是具體某個usb設備

執行完這個后，界面會彈出對話框詢問用戶是否授予權限，然后會發送權限廣播，所以上面我們注冊一個廣播接收器來判斷權限狀態

第二：注冊USB設備插拔廣播

USB設備被插/拔后同樣會發送一個廣播，因此我們需要注冊一個接收器來接收這個廣播

IntentFilter stateFilter = new IntentFilter();

stateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);

stateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);

context.registerReceiver(usbStateReceiver, stateFilter);

其中.usbStateReceiver的實現如下：

private BroadcastReceiver usbStateReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

//USB連接上手機時會發送廣播android.hardware.usb.action.USB_STATE"及UsbManager.ACTION_USB_DEVICE_ATTACHED

if (action.equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)) {

LogUtils.i("有USB設備連接");

} else if (action.equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {//USB被拔出

LogUtils.i("USB連接斷開，程序退出！");

}

}

};

詳細介紹以上兩種，另附一個自己寫的USBUtil，里面的思路是，初始化話時傳入要連接設備的VendorId和ProductId，然后自動進行搜索，連接，授權等。只暴露讀/寫，開/關給外界，其他的全部自己處理

未經測試，請勿直接使用，僅供參考！！！！

package com.police.policefaceproject.utils;

import android.app.Activity;

import android.app.PendingIntent;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.IntentFilter;

import android.hardware.usb.UsbConstants;

import android.hardware.usb.UsbDevice;

import android.hardware.usb.UsbDeviceConnection;

import android.hardware.usb.UsbEndpoint;

import android.hardware.usb.UsbInterface;

import android.hardware.usb.UsbManager;

import java.util.Iterator;

import java.util.Map;

/**

* Created by Administrator on 2018/4/18.

*/

public class USBUtils {

private Activity activity;

private final String ACTION_USB_PERMISSION = "com.gudi.usb.permission";

private UsbManager manager;

private PendingIntent mPermissionIntent;

private BroadcastReceiver usbReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

final String action = intent.getAction();

if(action.equals(ACTION_USB_PERMISSION)){

UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);

if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {

if (device != null) {

USBCtrl(context);

}

} else {

LogUtils.i("USB權限被拒絕");

if(activity!=null && !activity.isDestroyed()){

activity.runOnUiThread(new Runnable() {

@Override

public void run() {

UiUtils.Alert(activity, "權限錯誤", "請重新插拔設備后，授予應用訪問USB權限","確定", new UiUtils.AlertCallBackOne() {

@Override

public void onClick(DialogInterface dialogInterface, int i) {

}

});

;

}

});

}

}

}

}

};

private UsbDeviceConnection usbConnection;

private UsbEndpoint uepIn;

private UsbEndpoint uepOut;

private int mProductId,mVendorId;

private BroadcastReceiver usbStateReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

//USB連接上手機時會發送廣播android.hardware.usb.action.USB_STATE"及UsbManager.ACTION_USB_DEVICE_ATTACHED

if (action.equals(UsbManager.ACTION_USB_DEVICE_ATTACHED)) {//判斷其中一個就可以了

LogUtils.i("有USB設備連接");

showMsg("有USB設備連接");

USBCtrl(context);

} else if (action.equals(UsbManager.ACTION_USB_DEVICE_DETACHED)) {//USB被拔出

LogUtils.i("USB連接斷開，程序退出！");

showMsg("USB連接斷開，請重試");

closeConn();

}

}

};

public void init(Activity context,int productId,int vendorId){

activity = context;

mProductId = productId;

mVendorId = vendorId;

manager = (UsbManager) context.getSystemService(Context.USB_SERVICE);

mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);

//注冊USB設備權限管理廣播

IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);

context.registerReceiver(usbReceiver, filter);

//注冊USB設備插拔廣播

IntentFilter stateFilter = new IntentFilter();

stateFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_ATTACHED);

stateFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);

stateFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);

context.registerReceiver(usbStateReceiver, stateFilter);

}

private Map getDevices(){

if(manager != null){

Map deviceMap = manager.getDeviceList();

return deviceMap;

}

return null;

}

private UsbDeviceConnection openDevice(Context context,UsbDevice device){

if(manager.hasPermission(device)){

UsbDeviceConnection DeviceConnection = manager.openDevice(device);

return DeviceConnection;

}else{

LogUtils.i("請求USB權限");

manager.requestPermission(device,mPermissionIntent);

return null;

}

}

private void USBCtrl(Context context){

//獲取設備列表

Map devicesList= getDevices();

if(devicesList == null || devicesList.size() <=0){

LogUtils.e("未查找到USB設備");

showMsg("未查找到設備，請重新插拔設備");

}else{

//遍歷尋找指定設備

Iterator deviceIterator = devicesList.values().iterator();

while(deviceIterator.hasNext()){

UsbDevice usb= deviceIterator.next();

if(usb.getVendorId() == mVendorId && usb.getProductId() == mProductId){

//查找到指定設備

connDevice(context,usb);

break;

}

}

}

}

private void connDevice(Context context,UsbDevice device){

UsbEndpoint uep;

//獲得設備接口

UsbInterface usbInterface = device.getInterface(0);

//查找輸入，輸出端

for(int i =0;i

uep=usbInterface.getEndpoint(i);

if(uep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK){

if(uep.getDirection() == UsbConstants.USB_DIR_IN){

uepIn = uep;

}else if(uep.getDirection() == UsbConstants.USB_DIR_OUT){

uepOut = uep;

}

}

}

usbConnection = openDevice(context,device);

if(usbConnection == null){

LogUtils.e("連接設備失敗");

showMsg("連接設備失敗，請賦予權限");

return ;

}

if(usbConnection.claimInterface(usbInterface,true)){//聲明獨占此接口，在發送或接收數據前完成

//鎖定成功

}else{

//鎖定失敗

usbConnection.close();

usbConnection = null;

LogUtils.e("鎖定接口失敗");

showMsg("鎖定接口失敗，請插拔設備重試");

}

}

public int write(byte[] data){

if(usbConnection != null){

int len= usbConnection.bulkTransfer(uepOut, data, data.length, 3000);

LogUtils.i("通過USB接口發送"+data.length+"數據");

return len;

}else{

LogUtils.i("usbConnection為null");

return -1;

}

}

public byte[] read(byte[] data){

if(usbConnection != null){

int len= usbConnection.bulkTransfer(uepOut, data, data.length, 3000);

LogUtils.i("通過USB接口接收"+data.length+"數據");

return data;

}else{

LogUtils.i("接收數據，usbConnection為null");

return null;

}

}

public void closeConn(){

if(usbConnection != null){

usbConnection.close();

usbConnection=null;

}

}

private void showMsg(final String msg){

if(activity!=null ){

activity.runOnUiThread(new Runnable() {

@Override

public void run() {

UiUtils.toast(activity.getApplicationContext(),msg);

}

});

}

}

}

未經測試，請勿直接使用，僅供參考！！！！

總結

以上是生活随笔為你收集整理的Android usb 权限广播,[Android]USB开发的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。