本文将介绍android真机环境下如何获取内置和外置SD卡路径。

测试环境：三星Note3，其他手机待测试。。。

所需权限（AndroidManifest.xml文件里）

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  

获取路径代码（MainActivity.java文件）

    package com.example.androidtest;  
      
    import java.io.BufferedReader;  
    import java.io.File;  
    import java.io.InputStream;  
    import java.io.InputStreamReader;  
    import java.util.ArrayList;  
    import java.util.List;  
      
    import android.os.Bundle;  
    import android.os.Environment;  
    import android.app.Activity;  
    import android.view.Menu;  
      
    public class MainActivity extends Activity {  
      
        @Override  
        protected void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.activity_main);  
      
            StringBuilder log = new StringBuilder();  
            String inPath = getInnerSDCardPath();  
            log.append("内置SD卡路径：" + inPath + "\r\n");  
              
            List<String> extPaths = getExtSDCardPath();  
            for (String path : extPaths) {  
                log.append("外置SD卡路径：" + path + "\r\n");  
            }  
            System.out.println(log.toString());  
        }  
          
        /** 
         * 获取内置SD卡路径 
         * @return 
         */  
        public String getInnerSDCardPath() {    
            return Environment.getExternalStorageDirectory().getPath();    
        }  
      
        /** 
         * 获取外置SD卡路径 
         * @return  应该就一条记录或空 
         */  
        public List<String> getExtSDCardPath()  
        {  
            List<String> lResult = new ArrayList<String>();  
            try {  
                Runtime rt = Runtime.getRuntime();  
                Process proc = rt.exec("mount");  
                InputStream is = proc.getInputStream();  
                InputStreamReader isr = new InputStreamReader(is);  
                BufferedReader br = new BufferedReader(isr);  
                String line;  
                while ((line = br.readLine()) != null) {  
                    if (line.contains("extSdCard"))  
                    {  
                        String [] arr = line.split(" ");  
                        String path = arr[1];  
                        File file = new File(path);  
                        if (file.isDirectory())  
                        {  
                            lResult.add(path);  
                        }  
                    }  
                }  
                isr.close();  
            } catch (Exception e) {  
            }  
            return lResult;  
        }  
      
        @Override  
        public boolean onCreateOptionsMenu(Menu menu) {  
            // Inflate the menu; this adds items to the action bar if it is present.  
            getMenuInflater().inflate(R.menu.activity_main, menu);  
            return true;  
        }  
      
    }  

其中，line.contains("extSdCard")判断部分有待进一步验证！

打印结果：

1. 插入一张外置SD卡后

    内置SD卡路径：/storage/emulated/0  
    外置SD卡路径：/storage/extSdCard  

2. 取出外置SD卡后

内置SD卡路径：/storage/emulated/0  

来自：http://blog.csdn.net/chadeltu/article/details/43736093