Java tutorial
//package com.java2s; import android.os.Environment; import java.io.File; public class Main { private static final String DIRNAME = "ipcam"; private static final String FILENAME = "data.json"; public static boolean isSettingsFileExist() { File dir = new File(Environment.getExternalStorageDirectory(), DIRNAME); File file = new File(dir, FILENAME); return file.exists(); } }