Android 获取存储卡路径和空间使用情况

/** 获取存储卡路径 */  
 
  File sdcardDir=Environment.getExternalStorageDirectory();   
 
  /** StatFs 看文件系统空间使用情况 */  
 
  StatFs statFs=new StatFs(sdcardDir.getPath());   
 
  /** Block 的 size*/  
 
  Long blockSize=statFs.getBlockSize();   
 
  /** 总 Block 数量 */  
 
  Long totalBlocks=statFs.getBlockCount();   
 
  /** 已使用的 Block 数量 */  
 
  Long availableBlocks=statFs.getAvailableBlocks();

 

public class

Environment 英音：[in'vaiərənmənt]美音：[ɪn'vaɪrənmənt]

extends Object

<!-- end header -->

java.lang.Object
↳	android.os.Environment

Class Overview(类概述)

---

Provides access to environment variables. 提供访问环境变量。

 

 

常量

Constants

String	MEDIA_BAD_REMOVAL	getExternalStorageState() returns MEDIA_BAD_REMOVAL if the media was removed before it was unmounted.
String	MEDIA_CHECKING	getExternalStorageState() returns MEDIA_CHECKING if the media is present and being disk-checked
String	MEDIA_MOUNTED	getExternalStorageState() returns MEDIA_MOUNTED if the media is present and mounted at its mount point with read/write access.
String	MEDIA_MOUNTED_READ_ONLY	getExternalStorageState() returns MEDIA_MOUNTED_READ_ONLY if the media is present and mounted at its mount point with read only access.
String	MEDIA_NOFS	getExternalStorageState() returns MEDIA_NOFS if the media is present but is blank or is using an unsupported filesystem
String	MEDIA_REMOVED	getExternalStorageState() returns MEDIA_REMOVED if the media is not present.
String	MEDIA_SHARED	getExternalStorageState() returns MEDIA_SHARED if the media is present not mounted, and shared via USB mass storage.
String	MEDIA_UNMOUNTABLE	getExternalStorageState() returns MEDIA_UNMOUNTABLE if the media is present but cannot be mounted.
String	MEDIA_UNMOUNTED	getExternalStorageState() returns MEDIA_UNMOUNTED if the media is present but not mounted.

 

 

 

 

Public Constructors（构造函数）

	Environment()

<!-- ========== METHOD SUMMARY =========== -->

Public Methods

static File	getDataDirectory() ：    Gets the Android data directory.获取Android的数据目录。
static File	getDownloadCacheDirectory()  ： Gets the Android Download/Cache content directory.获取的Andr​​oid下载/缓存内容的目录。
static File	getExternalStorageDirectory()  ：Gets the Android external storage directory.获取Android的外部存储目录。
static File	getExternalStoragePublicDirectory(String type) ：Get a top-level public external storage directory for placing files of a particular type.获取为特定类型的文件放在顶层的公共外部存储目录。
static String	getExternalStorageState() ：Gets the current state of the primary "external" storage device.获取的主要“外部”存储设备的当前状态。
static File	getRootDirectory() ：Gets the Android root directory.获取Android的根目录。
static boolean	isExternalStorageEmulated() ：Returns whether the device has an external storage device which is emulated.返回设备是否有外部存储设备的仿真。
static boolean	isExternalStorageRemovable() :Returns whether the primary "external" storage device is removable.返回主“外部存储设备是否是可拆卸的。

 

 

public static File getExternalStorageDirectory ()

获取Android的外部存储目录。这个目录可能目前无法访问，如果它已被安装在其计算机上的用户，已被删除从设备，或发生其他一些问题。你可以确定其当前状态 getExternalStorageState（） 。

注意：不要被这里的“外部”字混淆。这个目录可以更好地被看作媒体/共享存储。这是一个文件系统，可容纳的数据量相对较大，跨所有应用程序共享（不执行的权限）。传统上，这是一个SD卡，但它也可作为内置存储设备，从受保护的内部存储是不同的，可以在计算机上的文件系统安装在实施。

在与多个“外部”存储目录（如既安全应用程序存储和挂载共享存储）设备中，这个目录表示“小学化”的用户将与外部存储。

应用程序不应该直接使用这个顶级目录，以避免污染用户的根命名空间。任何专用应用程序的文件，这些文件应该被放置在返回目录Context.getExternalFilesDir，该系统将采取删除，如果应用程序被卸载。其他共享文件应该被放置在一个由返回目录getExternalStoragePublicDirectory（字符串）。

下面是一个典型的代码，例如监察外部存储的状态：

 

BroadcastReceiver mExternalStorageReceiver;
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;

void updateExternalStorageState() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        mExternalStorageAvailable = mExternalStorageWriteable = true;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        mExternalStorageAvailable = true;
        mExternalStorageWriteable = false;
    } else {
        mExternalStorageAvailable = mExternalStorageWriteable = false;
    }
    handleExternalStorageState(mExternalStorageAvailable,
            mExternalStorageWriteable);
}

void startWatchingExternalStorage() {
    mExternalStorageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i("test", "Storage: " + intent.getData());
            updateExternalStorageState();
        }
    };
    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_MEDIA_MOUNTED);
    filter.addAction(Intent.ACTION_MEDIA_REMOVED);
    registerReceiver(mExternalStorageReceiver, filter);
    updateExternalStorageState();
}

void stopWatchingExternalStorage() {
    unregisterReceiver(mExternalStorageReceiver);
}