Android Usb获取以及读写详解手机开发

Android 6.0 之后提供了StorageManager支持读写U盘。有部分是hide方法需要利用下反射，以下记录下。

读取U盘

public static List<UsbDevice> readUsbDevice(Context context) {
    
    List<UsbDevice> devices = new ArrayList<>(); 
    try {
    
        StorageManager storageManager = (StorageManager)context.getSystemService(Context.STORAGE_SERVICE); 
        Method volumeListMethod = StorageManager.class.getMethod("getVolumeList"); 
        volumeListMethod.setAccessible(true); 
        Method pathMethod = StorageVolume.class.getMethod("getPath"); 
        pathMethod.setAccessible(true); 
        StorageVolume[] volumeList = (StorageVolume[]) volumeListMethod.invoke(storageManager); 
        if (volumeList == null) {
    
            return devices; 
        } 
        // 去除本地目录 
        String localPath = Environment.getExternalStorageDirectory().getAbsolutePath(); 
        for (StorageVolume volume: volumeList) {
    
            String description = volume.getDescription(context); 
            String path = (String) pathMethod.invoke(volume); 
            if (!volume.isRemovable() && !TextUtils.equals(localPath, path)) {
    
                devices.add(new UsbDevice(description, path)); 
            } 
        } 
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
    
        e.printStackTrace(); 
    } 
    return devices; 
} 

写入U盘文件

上面的UsbDevice已经拿到了Usb的路径path，以下就如同操作文件夹一样写入文件就ok了