android - 如何在android中获取内部SD卡存储和外部(移除)SD卡存储以及系统存储和可用内存状态？

Question

我是 Android 新手。我需要获取内部存储、外部存储和系统存储的简单代码，以及如何获取可用内存(内部和外部)空间、总内存空间的详细信息。我的代码如下，但在“StatFs”方法中出现错误。提前致谢。

    long total, aval,total1, aval1,total2, aval2;
    int kb = 1024;

    StatFs fs = new StatFs(Environment.
                            getExternalStorageDirectory().getPath());

    total = fs.getBlockCount() * (fs.getBlockSize() / kb);
    aval = fs.getAvailableBlocks() * (fs.getBlockSize() / kb);
    //Here Iam Getting error StatFs method not loading
    StatFs fs1 = new StatFs(Environment.
    getRootDirectory()+"/storage/extSdCard/");


 total1 = fs1.getBlockCount() * (fs1.getBlockSize() / kb);
 aval1 = fs1.getAvailableBlocks() * (fs1.getBlockSize() / kb);

    pb1.setMax((int)total);
    pb1.setProgress((int)aval);
    pb2.setMax((int)total1);
    pb2.setProgress((int)aval1);

}

Answer 1

访问 SDCARD 服务时始终首先检查 SDCARD 当前是否已安装。 您不能假设它是:

String state = Environment.getExternalStorageState();

if (state.equals(android.os.Environment.MEDIA_MOUNTED)) {
       // is mounted, can continue and check size

        StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
        long AvailableBytes = (long)stat.getBlockSize() *(long)stat.getBlockCount();
        long AvailableInMegas = AvailableBytes / 1048576; // <------------------
}

现在，要获取可用的内部存储:

File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
long availableInternalInBytes = formatSize(availableBlocks * blockSize);

注意:以上内容将为所有人返回可用存储空间，而不仅仅是您的应用程序!

获取内存使用情况:

final Runtime runtime = Runtime.getRuntime();
final long totalMem = runtime.totalMemory(); // <--------- total for YOUR JVM!
final long freeMem = runtime.freeMemory();  // <--------- free in YOUR JVM!
final long usedMem = totalMem - freeMem; // <--------- used in YOUR JVM!
final long maxMem = runtime.maxMemory()  // <--------- the max amount of mem that YOUR JVM may attempt to use

所有值均以字节为单位。

最后 - 询问外部存储器(不是 SDCARD):

您的代码假设上述路径是“/mnt/extSdCard/”。这是无法保证的。在某些设备中 它是“/mnt/external_sd/”。还可以有其他名称..

您需要做的是首先列出所有已安装的存储设备，然后以某种方式(以编程方式、用户干预......)选择您的一个。实现方法如下:

File mountedRoot = new File("/mnt/");
if(mountedRoot.isDirectory()) {
    String[] allMountedFolders = storageDir.list();
    if (allMountedFolders != null) {
         for (String f: allMountedFolders) {
               // iterate over all mounted devices <-----------------------
         }
    }

}