Java tutorial
//package com.java2s; import android.os.Environment; import android.os.StatFs; import java.io.File; public class Main { public static long getAvailableInternalMemorySize() { File path = Environment.getDataDirectory(); StatFs stat = new StatFs(path.getPath()); long blockSize = stat.getBlockSize(); long availableBlocks = stat.getAvailableBlocks(); return blockSize * availableBlocks; } }