Android开发获取多个存储空间的路径（内置SD卡以及外置SD卡）

Android开发中经常会遇到多存储空间的问题，包括内置存储路径以及外置SD卡，而且有的时候会有多张外置SD卡，此时就需要获取不同的SD卡路径，然后根据需要来写入或者读出文件。

此处给出常用的SD卡工具类，用于获取内外部存储路径。

/**
 * Created by Travis1022 on 2017/8/8.
 */

public class SdCardUtil {
    /**
     * 获取内置SD卡路径
     *
     * @return
     */
    public static String getInnerSDCardPath() {
        return Environment.getExternalStorageDirectory().getPath();
    }

    /**
     * 获取存储路径
     * @return 所有可用于存储的不同的卡的位置，用一个List来保存
     */
    public static List<String> getExtSDCardPathList() {
        List<String> paths = new ArrayList<String>();
        String extFileStatus = Environment.getExternalStorageState();
        File extFile = Environment.getExternalStorageDirectory();
        //首先判断一下外置SD卡的状态，处于挂载状态才能获取的到
        if (extFileStatus.equals(Environment.MEDIA_MOUNTED) && extFile.exists() && extFile.isDirectory() && extFile.canWrite()) {
            //外置SD卡的路径
            paths.add(extFile.getAbsolutePath());
        }
        try {
            Runtime runtime = Runtime.getRuntime();
            Process process = runtime.exec("mount");
            InputStream is = process.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            int mountPathIndex = 1;
            while ((line = br.readLine()) != null) {
                // format of sdcard file system: vfat/fuse
                if ((!line.contains("fat") && !line.contains("fuse") && !line
                        .contains("storage"))
                        || line.contains("secure")
                        || line.contains("asec")
                        || line.contains("firmware")
                        || line.contains("shell")
                        || line.contains("obb")
                        || line.contains("legacy") || line.contains("data")) {
                    continue;
                }
                String[] parts = line.split(" ");
                int length = parts.length;
                if (mountPathIndex >= length) {
                    continue;
                }
                String mountPath = parts[mountPathIndex];
                if (!mountPath.contains("/") || mountPath.contains("data")
                        || mountPath.contains("Data")) {
                    continue;
                }
                File mountRoot = new File(mountPath);
                if (!mountRoot.exists() || !mountRoot.isDirectory()
                        || !mountRoot.canWrite()) {
                    continue;
                }
                boolean equalsToPrimarySD = mountPath.equals(extFile
                        .getAbsolutePath());
                if (equalsToPrimarySD) {
                    continue;
                }
                //扩展存储卡即TF卡或者SD卡路径
                paths.add(mountPath);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return paths;
    }

}

getInnerSDCardPath()即为直接获取内部存储空间的路径，而对应的getExtSDCardPathList()用于获取所有的存储路径，也包含内部存储路径。

效果如下：

对应的日志如下：

E/Logger: [ (SdCardUtil.java:98)#main ] 路径:/storage/emulated/0
                             E/Logger: [ (SdCardUtil.java:98)#main ] 路径:/storage/uicc0
                             E/Logger: [ (SdCardUtil.java:98)#main ] 路径:/storage/sdcard1