Environment管理外存储设备

向SD卡输出文件，Environment.getExternalStorageDirectory().toString()SD卡路径

File file = new File(new File(Environment.getExternalStorageDirectory().toString()),filenametext);
FileOutputStream outStream = new FileOutputStream(file);
outStream.write(filecontenttext.getBytes());
outStream.close();

<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Environment.MEDIA_开头的是当前SD卡的状态

//判断SD是否存在而且可以读取
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{

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android第十一步把文件保存到SDCard