Android gets the path of built-in sdcard and external sdcard

Android gets the path of built-in sdcard and external sdcard

Android gets the path of the built-in sdcard and the external sdcard. (two mobile phones have been tested, and the pro test is available)

1. Get the external sdcard path first. This interface is the standard interface provided by the system. 2. Get the upper level folder directory. 3. Get all folders of the directory. According to the judgment, get the built-in sdcard and external sdcard. 4. When the program is running, remember to add the permission to read sdcard to the program

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