android获取内置和外置SD卡路径

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 + "
");

        List<String> extPaths = getExtSDCardPath();
        for (String path : extPaths) {
            log.append("外置SD卡路径：" + path + "
");
        }
        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