一些Android设备有内置闪存，我们可以检查这个内存 Environment.getExternalStorageDirectory（）。但是，当我们插入SD卡，则系统区分这两个与 /存储/ sdcard0 和 /存储/ sdcard1 。

Some android devices has built-in flash memory, and we can check this memory at Environment.getExternalStorageDirectory(). But, when we insert an SD card, then the system differentiates these two with /storage/sdcard0 and /storage/sdcard1.

我不知道是否 /存储/ sdcard0 是闪存或SD卡存储。任何人都可以提供任何解释，哪个是哪个？

I am not sure whether /storage/sdcard0 is flash memory or SD card memory. Could anyone provide any explanation as to which is which?

推荐答案

使用方法 Environment.isExternalStorageRemovable（）来确定它是否是一个可移动的SD卡或没有。

Use the method Environment.isExternalStorageRemovable() to determine if it's a removable SD card or not.

编辑澄清：

考虑以下方法：

public enum ExternalStorageStatus { 
    READ_WRITE , READ_ONLY, NONE
}

public static ExternalStorageStatus checkExternalStorageStateAvailable(){
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        return ExternalStorageStatus.READ_WRITE;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return ExternalStorageStatus.READ_ONLY;
    } else {
        return ExternalStorageStatus.NONE;
    }
}

方法 Environment.getExternalStorageState（）返回存储的当前状态。如果没有真正的外部存储（即介质中 isExternalStorageRemoveable（） ==假），那么这将返回内部存储的当前状态。如果 isExternalStorageRemoveable（） == true，则getExternalStorageState（）返回可移动SD卡的状态。

The method Environment.getExternalStorageState() returns the current state of your storage. If no REAL external storage (i.e. a medium in which isExternalStorageRemoveable() == false), then this returns the current state of your internal storage. If isExternalStorageRemoveable() == true, then getExternalStorageState() returns the state of your removable SD card.

实际外部存储的优先次序。

Actual external storage is prioritized.