Java tutorial
//package com.java2s; import android.content.Context; import android.os.Environment; import android.os.StatFs; import android.text.format.Formatter; import java.io.File; public class Main { public static String getRomTotalSize(Context context) { File path = Environment.getDataDirectory(); StatFs stat = new StatFs(path.getPath()); long blockSize = stat.getBlockSize(); long totalBlocks = stat.getBlockCount(); return Formatter.formatFileSize(context, blockSize * totalBlocks); } }