[Solved] Android java : How to create folder inside android devices?

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3 step:

  1. To get sd card is mounted at /sdcard or any other location by using this way:

    Environment.getExternalStorageDirectory();

  2. You have to take uses-permission entry in the AndroidManifest.xml file:

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

  3. If directory already exists, then mkdir return false. Try creatinng new directory if it not exist:

    File folder = new File(Environment.getExternalStorageDirectory() + "/map");
boolean success = true;
if (!folder.exists()) {
    success = folder.mkdir();
}
if (success) {
    // Do something on success
} else {
    // Do something else on failure 
}

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solved Android java : How to create folder inside android devices?