如何以编程方式在android6.0中获取SD_Card路径

问题描述：

我正在尝试通过使用如下所示的外部存储路径来检查设备是否具有外部存储空间

I am trying to check whether device having external storage or not by using external storage path like this given below

 if (new File("/ext_card/").exists()) {
        specialPath = "/ext_card/";
    } else if (new File("/mnt/sdcard/external_sd/").exists()) {
        specialPath = "/mnt/sdcard/external_sd/";
    } else if (new File("/storage/extSdCard/").exists()) {
        specialPath = "/storage/extSdCard/";
    } else if (new File("/mnt/extSdCard/").exists()) {
        specialPath = "/mnt/extSdCard/";
    } else if (new File("/mnt/sdcard/external_sd/").exists()) {
        specialPath = "/mnt/sdcard/external_sd/";
    } else if (new File("storage/sdcard1/").exists()) {
        specialPath = "storage/sdcard1/";
    }

但是在棉花糖中，我找不到此路径，并且在使用ES FILEMANAGER检查时，它们的输出类似于在Moto G第三代中的storage/3263-3131.在检查其他棉花糖设备时，数字会有所不同.请帮助我检查棉花糖设备是否具有外部存储器?并且是否找到存储意味着如何获取该外部存储的路径?

But in marshmallow I con't find this path and while checking using ES FILEMANAGER, they give like storage/3263-3131 in Moto G 3rd generation. While check in other marshmallow devices that numbers getting differ. Please help me to check that marshmallow device have external storage or not? and if storage found means how to get the path of that external storage?

注意:-我在我的应用程序中授予了存储权限，并在我的应用程序设置中启用了存储权限.

Note:- I gave permission for storage in my application and also enabled storage permission in settings for my app.

在此先感谢您，如果您发现我的问题中有任何错误，请告诉我.再次谢谢你.

Thanks in advance and did you find any mistake in my question please crt it. thank you again.

答

这是我的解决方案，可以保证在Android 7.0牛轧糖之前运行:

Here's my solution, which is guaranteed to work till Android 7.0 Nougat:

/* returns external storage paths (directory of external memory card) as array of Strings */
public String[] getExternalStorageDirectories() {

        List<String> results = new ArrayList<>();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //Method 1 for KitKat & above
        File[] externalDirs = getExternalFilesDirs(null);
        String internalRoot = Environment.getExternalStorageDirectory().getAbsolutePath().toLowerCase();

        for (File file : externalDirs) {
            if(file==null) //solved NPE on some Lollipop devices
               continue;
            String path = file.getPath().split("/Android")[0];

            if(path.toLowerCase().startsWith(internalRoot))
               continue;

            boolean addPath = false;

            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                addPath = Environment.isExternalStorageRemovable(file);
            }
            else{
                addPath = Environment.MEDIA_MOUNTED.equals(EnvironmentCompat.getStorageState(file));
            }

            if(addPath){
                results.add(path);
            }
        }
    }

        if(results.isEmpty()) { //Method 2 for all versions
            // better variation of: http://stackoverflow.com/a/40123073/5002496
            String output = "";
            try {
                final Process process = new ProcessBuilder().command("mount | grep /dev/block/vold")
                .redirectErrorStream(true).start();
                process.waitFor();
                final InputStream is = process.getInputStream();
                final byte[] buffer = new byte[1024];
                while (is.read(buffer) != -1) {
                    output = output + new String(buffer);
                }
                is.close();
            } catch (final Exception e) {
                e.printStackTrace();
            }
            if(!output.trim().isEmpty()) {
                String devicePoints[] = output.split("\n");
                for(String voldPoint: devicePoints) {
                    results.add(voldPoint.split(" ")[2]);
                }
            }
        }

        //Below few lines is to remove paths which may not be external memory card, like OTG (feel free to comment them out)
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            for (int i = 0; i < results.size(); i++) {
                if (!results.get(i).toLowerCase().matches(".*[0-9a-f]{4}[-][0-9a-f]{4}")) {
                    Log.d(LOG_TAG, results.get(i) + " might not be extSDcard");
                    results.remove(i--);
                }
            }
        } else {
            for (int i = 0; i < results.size(); i++) {
                if (!results.get(i).toLowerCase().contains("ext") && !results.get(i).toLowerCase().contains("sdcard")) {
                    Log.d(LOG_TAG, results.get(i)+" might not be extSDcard");
                    results.remove(i--);
                }
            }
        }

        String[] storageDirectories = new String[results.size()];
        for(int i=0; i<results.size(); ++i) storageDirectories[i] = results.get(i);

        return storageDirectories;
    }

如何以编程方式在android6.0中获取SD_Card路径

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