Android 外接TF卡，外接USB设备监听

- 权限

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-feature android:name="android.hardware.usb.host" android:required="true"/> <uses-feature android:name="android.hardware.usb.accessory" android:required="true"/>

- 广播注册

外接TF卡

IntentFilter usbFilter = new IntentFilter(); usbFilter.addAction(Intent.ACTION_MEDIA_MOUNTED); usbFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED); usbFilter.addAction(Intent.ACTION_MEDIA_EJECT); usbFilter.addDataScheme("file"); registerReceiver(usbReceiver, usbFilter);

外接USB设备

UsbAttachReceiver usbAttachReceiver = new UsbAttachReceiver(); IntentFilter usbAttachFilter = new IntentFilter(); usbAttachFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_ATTACHED); usbAttachFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED); usbAttachFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED); usbAttachFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED); usbAttachFilter.addAction("android.hardware.usb.action.USB_STATE"); registerReceiver(usbAttachReceiver,usbAttachFilter);

广播就没写了，安装注册的Action来就好

- 外接设备判断

public static boolean isExtraStorage(Context context){
    String path="";
    StorageManager mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
    Class<?> volumeInfoClazz;
    Class<?> diskInfoClaszz;
    try {
        volumeInfoClazz = Class.forName("android.os.storage.VolumeInfo");
        diskInfoClaszz = Class.forName("android.os.storage.DiskInfo");
        Method StorageManager_getVolumes=Class.forName("android.os.storage.StorageManager").getMethod("getVolumes");
        Method VolumeInfo_GetDisk = volumeInfoClazz.getMethod("getDisk");
        Method VolumeInfo_GetPath = volumeInfoClazz.getMethod("getPath");
        Method DiskInfo_IsUsb = diskInfoClaszz.getMethod("isUsb");
        Method DiskInfo_IsSd = diskInfoClaszz.getMethod("isSd");
        List<Object> List_VolumeInfo = (List<Object>) StorageManager_getVolumes.invoke(mStorageManager);
        assert List_VolumeInfo != null;
        for(int i=0; i<List_VolumeInfo.size(); i++){
            Object volumeInfo = List_VolumeInfo.get(i);
            Object diskInfo = VolumeInfo_GetDisk.invoke(volumeInfo);
            if(diskInfo==null)continue;
            boolean sd= (boolean) DiskInfo_IsSd.invoke(diskInfo);
            boolean usb= (boolean) DiskInfo_IsUsb.invoke(diskInfo);
            File file= (File) VolumeInfo_GetPath.invoke(volumeInfo);
            if(usb){//通过usb外接U盘设备
                assert file != null;
                path=file.getAbsolutePath();
            }else if(sd){//外接sd卡
                assert file != null;
                path=file.getAbsolutePath();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return !TextUtils.isEmpty(path);
}