Here you can find the source of getRealSizeOnPhone()
public static long getRealSizeOnPhone()
//package com.java2s; //License from project: Apache License import java.io.File; import android.os.Environment; import android.os.StatFs; public class Main { public static long getRealSizeOnPhone() { File path = Environment.getDataDirectory(); StatFs stat = new StatFs(path.getPath()); long blockSize = stat.getBlockSize(); long availableBlocks = stat.getAvailableBlocks(); long realSize = blockSize * availableBlocks; return realSize; }// w ww . j a va 2 s . com }