java - Android 内存使用情况

Question

我是 Android 新手，我想在内部存储中找到可用内存。我使用两个函数来查找可用内存，但它们以长格式显示两个不同的值。我不知道为什么？这是我的代码:

1) getTIM()函数的结果是558628864

public String getTIM(){
    File path = Environment.getDataDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    long totalBlocks = stat.getBlockCount();
    String str = Long.toString(blockSize * totalBlocks);
    return str;
} 

2) ITMStr()函数的结果是914120704

public String ITMStr(){
    StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
    long blockCount = statFs.getBlockCountLong();
    long blockSize = statFs.getBlockSizeLong();
    long total = blockCount * blockSize;
    String str = Long.toString(total);
    return str;
}

哪个值是正确的？

Answer 1

根据reference :

public static File getDataDirectory ()

Added in API level 1 Return the user data directory.

_

public static File getRootDirectory ()

Added in API level 1 Return root of the "system" partition holding the core Android OS. Always present and mounted read-only.

因此，当您获得不同元素的尺寸时，尺寸也会有所不同。