android 获取外置sd卡根目录

Android获取外部SDcard的官方调用是
Environment.getExternalStorageDirectory()

但是根据不同机型，是有不同的结果的。

通过 android 的api可以获取系统内置的sdcard存贮目录，但是有些机器本身具有内置的sdcard存贮卡又可以外置SD卡，这样通过系统api获取的路径就只能是内置存贮卡目录，有些手机可能有两个存贮目录mnt/sdcard/ mnt/extsdcard或者storage/sdcard0 storage/extsdcard

so：

通过如下方式获得

try {Runtime runtime = Runtime.getRuntime();Process proc = runtime.exec("mount");InputStream is = proc.getInputStream();InputStreamReader isr = new InputStreamReader(is);String line;String mount = new String();BufferedReader br = new BufferedReader(isr);while ((line = br.readLine()) != null) {if (line.contains("secure")) continue;if (line.contains("asec")) continue;if (line.contains("fat")) {String columns[] = line.split(" ");if (columns != null && columns.length > 1) {mount = mount.concat("*" + columns[1] + "\n");}} else if (line.contains("fuse")) {String columns[] = line.split(" ");if (columns != null && columns.length > 1) {mount = mount.concat(columns[1] + "\n");}}}txtView.setText(mount);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}

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