Android 获取 usb 权限的两种方法

一、直接在AndroidManifest.xml文件中的acitivity加入以下配置：

        <intent-filter>
           <action android:name="android.intent.action.MAIN" />
           <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <intent-filter>
            <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
        </intent-filter>
        <meta-data
            android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
            android:resource="@xml/device_filter" />

二、动态代码获取
private static final String ACTION_USB_PERMISSION = “com.android.usb.USB_PERMISSION”;
///申请权限
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
///注册广播
mContext.registerReceiver(mUsbReceiver, filter);
///获取权限
mUsbManager.requestPermission(mUSBDevice, pendingIntent); // 该代码执行后，系统弹出一个对话框/等待权限

///广播
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
@SuppressLint(“NewApi”)
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();

if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
mContext.unregisterReceiver(mUsbReceiver);
UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)
&& currentDevice.equals(device)) {
//TODO 授权成功，操作USB设备
}else{
//用户点击拒绝了
}
}
}
}
};