Environment 常用方法:
* 方法:getDataDirectory()
解释:返回 File ,获取 Android 数据目录。
* 方法:getDownloadCacheDirectory()
解释:返回 File ,获取 Android 下载/缓存内容目录。
* 方法:getExternalStorageDirectory()
解释:返回 File ,获取外部存储目录即 SDCard
* 方法:getExternalStoragePublicDirectory(String type)
解释:返回 File ,取一个高端的公用的外部存储器目录来摆放某些类型的文件
* 方法:getExternalStorageState()
解释:返回 File ,获取外部存储设备的当前状态
* 方法:getRootDirectory()
解释:返回 File ,获取 Android 的根目录
public void getSDPath(){ File sdDir = null; File sdDir1 = null; File sdDir2 = null; boolean sdCardExist = Environment.getExternalStorageState() .equals(android.os.Environment.MEDIA_MOUNTED); //判断sd卡是否存在 if (sdCardExist) { sdDir = Environment.getExternalStorageDirectory();//获取跟目录 sdDir1 = Environment.getDataDirectory(); sdDir2 =Environment.getRootDirectory(); } System.out.println("getExternalStorageDirectory(): "+sdDir.toString()); System.out.println("getDataDirectory(): "+sdDir1.toString()); System.out.println("getRootDirectory(): "+sdDir2.toString()); } //判断一个路径下的文件(文件夹)是否存在 public class IsExist { public static void main(String[] args) { isExist("e://12"); } /** * * @param path 文件夹路径 */ public static void isExist(String path) { File file = new File(path); //判断文件夹是否存在,如果不存在则创建文件夹 if (!file.exists()) { file.mkdir(); } } } //在SD卡上创建一个文件夹 public class make extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); File sd=Environment.getExternalStorageDirectory(); String path=sd.getPath()+"/notes"; File file=new File(path); if(!file.exists()) file.mkdir(); } }