原文：http://www.cnblogs.com/wanqieddy/archive/2011/12/28/2304906.html

由于工作的需要，今天研究了在android下創(chuàng)建文件夾和修改其權限的方法，需要了解的是每個應用程序包都會有一個私有的存儲數(shù)據(jù)的目錄（類似文件夾），只有屬于該包的應用程序才能寫入該目錄空間，每個包應用程序的私有數(shù)據(jù)目錄位 于Android絕對路徑/data/data/<包名>/目錄中。除了私有數(shù)據(jù)目錄應用程序還擁有/sdcard目錄（即SD Card的寫入權限，但不可以修改sd card下文件的訪問權限）。文件系統(tǒng)中其他系統(tǒng)目錄，第三方應用程序是不可寫入的。

?????? 代碼如下兩種：

1、

//創(chuàng)建文件夾

File destDir = new File(“/data/data/[your path]/temp”);
??if (!destDir.exists()) {
???destDir.mkdirs();
??}

//修改權限

?FileOutputStream?fos;???

?fos?=?openFileOutput("filename"?,?MODE_WORLD_READABLE);??

?

備注：可用的mode 參數(shù)如下：

??? /**
???? * File creation mode: the default mode, where the created file can only
???? * be accessed by the calling application (or all applications sharing the
???? * same user ID).
???? * @see #MODE_WORLD_READABLE
???? * @see #MODE_WORLD_WRITEABLE
???? */
??? public static final int MODE_PRIVATE = 0x0000;
??? /**
???? * File creation mode: allow all other applications to have read access
???? * to the created file.
???? * @see #MODE_PRIVATE
???? * @see #MODE_WORLD_WRITEABLE
???? */
??? public static final int MODE_WORLD_READABLE = 0x0001;
??? /**
???? * File creation mode: allow all other applications to have write access
???? * to the created file.
???? * @see #MODE_PRIVATE
???? * @see #MODE_WORLD_READABLE
???? */
??? public static final int MODE_WORLD_WRITEABLE = 0x0002;
??? /**
???? * File creation mode: for use with {@link #openFileOutput}, if the file
???? * already exists then write data to the end of the existing file
???? * instead of erasing it.
???? * @see #openFileOutput
???? */
??? public static final int MODE_APPEND = 0x8000;

?

2、

//創(chuàng)建文件夾

File destDir = new File(“/data/data/[your path]/temp”);
??if (!destDir.exists()) {
???destDir.mkdirs();
??}

Process p;
int status;
??? ??? ??? try {
??? ??? ??? ??? p = Runtime.getRuntime().exec("chmod 777 " +??destDir?);
??? ??? ??? ??? status = p.waitFor();???
??? ??? ??? ??? if (status == 0) {????
??? ??? ??? ??????? //chmod succeed???
??? ??? ??? ??? ??? Toast.makeText(this, "chmod succeed", Toast.LENGTH_LONG).show();
??? ??? ??? ??? } else {????
??? ??? ??? ??????? //chmod failed?
??? ??? ??? ??? ??? Toast.makeText(this, "chmod failed", Toast.LENGTH_LONG).show();
??? ??? ??? ??? }??
??? ??? ??? }

?

友情提醒：

如果是在sdcard下插入，最好先判斷sdcard是否插入，代碼如下 //首先判斷sdcard是否插入 String status = Environment.getExternalStorageState();
??if (status.equals(Environment.MEDIA_MOUNTED)) {
???return true;
??} else {
???return false;
??}

轉(zhuǎn)載于:https://www.cnblogs.com/mochaMM/p/5070908.html

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