* 方法：getDataDirectory()解釋：返回 File ，獲取 Android 數(shù)據(jù)目錄。* 方法：getDownloadCacheDirectory()解釋：返回 File ，獲取 Android 下載/緩存內(nèi)容目錄。* 方法：getExternalStorageDirectory()解釋：返回 File ，獲取外部存儲目錄即 SDCard* 方法：getExternalStoragePublicDirectory(String type)解釋：返回 File ，取一個高端的公用的外部存儲器目錄來擺放某些類型的文件* 方法：getExternalStorageState()解釋：返回 File ，獲取外部存儲設(shè)備的當(dāng)前狀態(tài)* 方法：getRootDirectory()解釋：返回 File ，獲取 Android 的根目錄public void getSDPath(){ File sdDir = null; File sdDir1 = null;File sdDir2 = null;boolean sdCardExist = Environment.getExternalStorageState() .equals(android.os.Environment.MEDIA_MOUNTED); //判斷sd卡是否存在 if (sdCardExist) { sdDir = Environment.getExternalStorageDirectory();//獲取跟目錄 sdDir1 = Environment.getDataDirectory();sdDir2 =Environment.getRootDirectory();} System.out.println("getExternalStorageDirectory(): "+sdDir.toString()); System.out.println("getDataDirectory(): "+sdDir1.toString()); System.out.println("getRootDirectory(): "+sdDir2.toString()); } //判斷一個路徑下的文件（文件夾）是否存在public class IsExist {public static void main(String[] args) {isExist("e://12");}/*** * @param path 文件夾路徑*/public static void isExist(String path) {File file = new File(path);//判斷文件夾是否存在,如果不存在則創(chuàng)建文件夾if (!file.exists()) {file.mkdir();}}}

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(); }