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android 简单文件IO

2010-11-24 23:47:45| 分类： android | 标签： |举报 |字号大中小订阅

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往android手机的自带内存（非SD卡）中读写文件
Activity的父类 Context 有方法可以获取输出和写入流。
分别是：
openFileOutput(name, mode);
openFileInput(name);
mode有
        Context.MODE_PRIVATE; //默认，仅此程序私有
        Context.MODE_APPEND;   //追加方式
        Context.MODE_WORLD_READABLE;   //（其它程序）可读
        Context.MODE_WORLD_WRITEABLE; //（其它程序）可写
这么几种，亦可这样设置： openFileOutput("log.txt",Context.MOAD_WORLD_READABLE+Context.MOAD_WORLD_WRITEABLE);
默认保存的路径为 /data/data/<程序的报名>/files/<文件名>

SD卡IO
需要权限：
android.permission.MOUNT_UNMOUNT_FILESYSTEMS
android.permission.WRITE_EXTERNAL_STORAGE
与PC机器上操作 IO 一样： File file=new File( filePath,fileName);
filePath需要以 /mnt/sdcard 开始，因为android2.2 这个是SD卡的路径。2.1以及之前路径是 /sdcard
在获取SD卡路径时也可这样：File sdFile = Environment.getExternalStorageDirectory();
保存在SD卡中的文件不受权限控制，可被任何程序读写。

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