如何判断是否该SD卡安装在机器人？ [英] How to tell if the sdcard is mounted in Android?

问题描述

我的工作，需要看什么图片用户存储一个Android应用程序。的问题是，如果用户具有安装经由USB线缆的SD卡，我无法读取图像列表在磁盘上。

I'm working on an Android application that needs to look at what images a user has stored. The problem is that if the user has the sdcard mounted via the USB cable, I can't read the list of images on the disk.

有谁知道的方式告诉如果USB安装，这样我可以弹出一个消息，通知其将无法正常工作的用户？

Does anyone know of a way to tell if the usb is mounted so that I could just pop up a message informing the user that it won't work?

推荐答案

如果您尝试访问该设备上的图像，最好的方法是使用<一个href="http://developer.android.com/reference/android/provider/MediaStore.Images.Media.html">MediaStore内容提供商。访问其作为内容提供商将允许您查询的是$ P $图像psent和地图内容：// 网​​址到设备上的文件路径酌情

If you're trying to access images on the device, the best method is to use the MediaStore content provider. Accessing it as a content provider will allow you to query the images that are present, and map content:// URLs to filepaths on the device where appropriate.

如果您仍然需要访问的SD卡，相机应用程序包括<一href="http://android.git.kernel.org/?p=platform/packages/apps/Camera.git;a=blob;f=src/com/android/camera/ImageManager.java;h=073b8db811d1a010079c7a258a418aa90fae2326;hb=dafe31ead98304414f84f021bd0c155e62d833c2">ImageUtils类如下检查，如果安装在SD卡：

If you still need to access the SD card, the Camera application includes an ImageUtils class that checks if the SD card is mounted as follows:

static public boolean hasStorage(boolean requireWriteAccess) {
    //TODO: After fix the bug,  add "if (VERBOSE)" before logging errors.
    String state = Environment.getExternalStorageState();
    Log.v(TAG, "storage state is " + state);

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        if (requireWriteAccess) {
            boolean writable = checkFsWritable();
            Log.v(TAG, "storage writable is " + writable);
            return writable;
        } else {
            return true;
        }
    } else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return true;
    }
    return false;
}

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