Android APP 检测和监听当前USB设备插入拔出以及读取VID/PID

一、列出所有的usb device设备，打印vip pid

private boolean AllDeviceConnected(){UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);HashMap<String, UsbDevice> usbList = manager.getDeviceList();for(String key: usbList.keySet()){UsbDevice usbDevice = usbList.get(key);if(usbDevice != null){Log.d(TAG, "usb device: " + usbDevice.getProductId() + ": " + usbDevice.getVendorId());}}return false;
}

二、使用BroadcastReceiver 系统广播监听usb设备拔插动作，实际测试android.hardware.usb.action.USB_STATE之侦听otg usb口的，而且不管是接这usb线还是不接usb线，进入app的时候，都会有一次广播。UsbManager.ACTION_USB_ACCESSORY_ATTACHED和UsbManager.ACTION_USB_ACCESSORY_DETACHED是U盘插入和拔出的广播，进入app的时候不管接U盘还是不接U盘，都没有广播，进入app后插拔U盘才有广播。

private void detectUsbWithBroadcast() {Log.d(TAG, "listenUsb: register");IntentFilter filter = new IntentFilter();filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);filter.addAction(UsbManager.ACTION_USB_ACCESSORY_ATTACHED);filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);filter.addAction("android.hardware.usb.action.USB_STATE");registerReceiver(mUsbStateChangeReceiver, filter);Log.d(TAG, "listenUsb: registered");}private BroadcastReceiver mUsbStateChangeReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {Log.d(TAG, "onReceive: " + intent.getAction());}};

三、直接贴出测试代码MainActivity.java，MainActivity.java不要有任何的修改，USBBroadcastReceiver\app\src\main\java\com\example\usblistener\MainActivity.java

package com.example.usblistener;import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;public class MainActivity extends AppCompatActivity {private static final String TAG = "USBDEVICE";private USBBroadcastReceiver usbBroadcastReceiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);intentFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_ATTACHED);intentFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);intentFilter.addAction("android.hardware.usb.action.USB_STATE");usbBroadcastReceiver = new USBBroadcastReceiver();registerReceiver(usbBroadcastReceiver, intentFilter);detectUsbDeviceWithUsbManager();AllDeviceConnected();}@Overrideprotected void onDestroy() {super.onDestroy();if (usbBroadcastReceiver != null) {unregisterReceiver(usbBroadcastReceiver);}}class USBBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubAllDeviceConnected();if (intent.getAction().equals("android.hardware.usb.action.USB_DEVICE_ATTACHED")  ||  intent.getAction().equals("android.hardware.usb.action.USB_DEVICE_DETACHED")) {UsbDevice usbDevice = (UsbDevice)intent.getExtras().get("device");Toast.makeText(MainActivity.this, "usb device status changed  action="+intent.getAction()+" pid="+usbDevice.getProductId()+" vid="+usbDevice.getVendorId(), Toast.LENGTH_SHORT).show();}if (intent.getAction().equals("android.hardware.usb.action.USB_STATE")) {if (intent.getExtras().getBoolean("connected")) {// usb 插入Toast.makeText(MainActivity.this, "usb insert", Toast.LENGTH_SHORT).show();Log.i(TAG,"usb insert");} else {//   usb 拔出Toast.makeText(MainActivity.this, "usb pull out", Toast.LENGTH_SHORT).show();Log.i(TAG,"usb  pull out");}}}}private void detectUsbDeviceWithUsbManager() {HashMap<String, UsbDevice> deviceHashMap = ((UsbManager) getSystemService(USB_SERVICE)).getDeviceList();for (Map.Entry entry : deviceHashMap.entrySet()) {Log.d(TAG, "detectUsbDeviceWithUsbManager: " + entry.getKey() + ", " + entry.getValue());}}private boolean isCurrentDeviceConnected(){UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);HashMap<String, UsbDevice> usbList = manager.getDeviceList();for(String key: usbList.keySet()){UsbDevice usbDevice = usbList.get(key);if(usbDevice != null && usbDevice.getProductId() == 10304 && usbDevice.getVendorId() == 1060){return true;}}return false;}private boolean AllDeviceConnected(){UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);HashMap<String, UsbDevice> usbList = manager.getDeviceList();for(String key: usbList.keySet()){UsbDevice usbDevice = usbList.get(key);if(usbDevice != null){Log.d(TAG, "usb device: " + usbDevice.getProductId() + ": " + usbDevice.getVendorId());}}return false;}
}

四、拔插U盘时候的log，测试ok。

五、在sdk frameworks中也会用到usb功能

frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

六、参考文章

https://www.pianshen.com/article/73781409679/

https://my.oschina.net/u/4352543/blog/3551136

https://www.pianshen.com/article/9533757691/

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