How to Create Folder Programmatically into Sdcard in Emulator in Android?

Write Following Line into your Oncreate Method:-

File wallpaperDirectory = new File("/sdcard/Wallpaper");
wallpaperDirectory.mkdirs();

Add below Uses-Permission into your AndroidManifest.xml File:-

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Now Run Your Project the Wallpaper Folder is Created in Your Sdcard.

Enjoy :-)

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