資源簡介
首先如果要在程序中使用sdcard進行存儲，我們必須要在AndroidManifset.xml文件進行下面的權限設置:
在AndroidManifest.xml中加入訪問SDCard的權限如下:
<!-- 在SDCard中創建與刪除文件權限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard寫入數據權限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
接著我們在使用SDcard進行讀寫的時候 會用到Environment類下面的幾個靜態方法
1: getDataDirectory() 獲取到Androi中的data數據目錄
2:getDownloadCacheDirectory() 獲取到下載的緩存目錄
3:getExternalStorageDirectory() 獲取到外部存儲的目錄 一般指SDcard
4:getExternalStorageState() 獲取外部設置的當前狀態 一般指SDcard,
android系統中對于外部設置的狀態，我們比較常用的應該是 MEDIA_MOUNTED（SDcard存在并且可以進行讀寫） MEDIA_MOUNTED_READ_ONLY (SDcard存在，只可以進行讀操作) 當然還有其他的一些狀態，可以在文檔中進行查找到
5:getRootDirectory() 獲取到Android Root路徑
6:isExternalStorageEmulated() 返回Boolean值判斷外部設置是否有效
7:isExternalStorageRemovable() 返回Boolean值，判斷外部設置是否可以移除
代碼片段和文件信息
/*?AUTO-GENERATED?FILE.??DO?NOT?MODIFY.
?*
?*?This?class?was?automatically?generated?by?the
?*?aapt?tool?from?the?resource?data?it?found.??It
?*?should?not?be?modified?by?hand.
?*/
package?com.jiangqq.sdcard;
public?final?class?R?{
????public?static?final?class?attr?{
????}
????public?static?final?class?drawable?{
????????public?static?final?int?ic_launcher=0x7f020000;
????}
????public?static?final?class?id?{
????????public?static?final?int?bt1=0x7f050001;
????????public?static?final?int?bt2=0x7f050003;
????????public?static?final?int?et1=0x7f050000;
????????public?static?final?int?et2=0x7f050002;
????}
????public?static?final?class?layout?{
????????public?static?final?int?main=0x7f030000;
????}
????public?static?final?class?string?{
????????public?static?final?i?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????5432??2012-01-12?14:56??QQ截圖20120112145649.png
?????文件???????24296??2012-01-12?15:07??QQ截圖20120112150735.png
?????文件???????26374??2012-01-12?15:07??QQ截圖20120112150745.png
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\
?????文件?????????364??2012-01-12?13:55??SDcardDemo\.classpath
?????文件?????????846??2012-01-12?13:55??SDcardDemo\.project
?????文件?????????999??2012-01-12?14:04??SDcardDemo\AndroidManifest.xm
?????目錄???????????0??2012-01-12?13:55??SDcardDemo\assets\
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\classes\
?????文件????????5712??2012-01-12?14:57??SDcardDemo\bin\classes.dex
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\classes\com\
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\classes\com\jiangqq\
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\classes\com\jiangqq\sdcard\
?????文件?????????340??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R$attr.class
?????文件?????????407??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R$drawable.class
?????文件?????????462??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R$id.class
?????文件?????????394??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R$layout.class
?????文件?????????427??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R$string.class
?????文件?????????531??2012-01-12?14:55??SDcardDemo\bin\classes\com\jiangqq\sdcard\R.class
?????文件????????2755??2012-01-12?14:57??SDcardDemo\bin\classes\com\jiangqq\sdcard\SDcardActivity$MySeton
?????文件????????1560??2012-01-12?14:57??SDcardDemo\bin\classes\com\jiangqq\sdcard\SDcardActivity.class
?????文件????????1799??2012-01-12?14:29??SDcardDemo\bin\classes\com\jiangqq\sdcard\SDcradService.class
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\res\
?????文件???????10976??2012-01-12?14:48??SDcardDemo\bin\resources.ap_
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\res\drawable-hdpi\
?????文件????????3966??2012-01-12?14:44??SDcardDemo\bin\res\drawable-hdpi\ic_launcher.png
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\res\drawable-ldpi\
?????文件????????1537??2012-01-12?14:44??SDcardDemo\bin\res\drawable-ldpi\ic_launcher.png
?????目錄???????????0??2012-01-12?15:09??SDcardDemo\bin\res\drawable-mdpi\
?????文件????????2200??2012-01-12?14:44??SDcardDemo\bin\res\drawable-mdpi\ic_launcher.png
............此處省略25個文件信息
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