android獲取內置和外置SD卡路徑

本文將介紹android真機環境下如何獲取內置和外置SD卡路徑。

測試環境：三星Note3，其他手機待測試。。。

所需權限（AndroidManifest.xml文件裏）

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

獲取路徑代碼（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("內置SD卡路徑：" + inPath + "\r\n");

        List<String> extPaths = getExtSDCardPath();
        for (String path : extPaths) {
            log.append("外置SD卡路徑：" + path + "\r\n");
        }
        System.out.println(log.toString());
    }

    /**
     * 獲取內置SD卡路徑
     * @return
     */
    public String getInnerSDCardPath() {
        return Environment.getExternalStorageDirectory().getPath();
    }

    /**
     * 獲取外置SD卡路徑
     * @return  應該就一條記錄或空
     */
    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")判斷部分有待進一步驗證！

打印結果：

1. 插入一張外置SD卡後

內置SD卡路徑：/storage/emulated/0
外置SD卡路徑：/storage/extSdCard

2. 取出外置SD卡後

內置SD卡路徑：/storage/emulated/0

android系統可通過Environment.getExternalStorageDirectory()獲取存儲卡的路徑，但是現在有很多手機內置有一個存儲空間，同時還支持外置sd卡插入，這樣通過Environment.getExternalStorageDirectory()方法獲取到的就是內置存儲卡的位置，需要獲取外置存儲卡的路徑就比較麻煩，這裏借鑑網上的代碼，稍作修改，在已有的手機上做了測試，效果還可以，當然也許還有其他的一些奇葩機型沒有覆蓋到。

<pre name="code" class="java">package com.example.getpath;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getPath2();
    }

    @SuppressLint("SdCardPath")
    public String getPath2() {
        String sdcard_path = null;
        String sd_default = Environment.getExternalStorageDirectory()
                .getAbsolutePath();
        Log.d("text", sd_default);
        if (sd_default.endsWith("/")) {
            sd_default = sd_default.substring(0, sd_default.length() - 1);
        }
        // 得到路徑
        try {
            Runtime runtime = Runtime.getRuntime();
            Process proc = runtime.exec("mount");
            InputStream is = proc.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            String line;
            BufferedReader br = new BufferedReader(isr);
            while ((line = br.readLine()) != null) {
                if (line.contains("secure"))
                    continue;
                if (line.contains("asec"))
                    continue;
                if (line.contains("fat") && line.contains("/mnt/")) {
                    String columns[] = line.split(" ");
                    if (columns != null && columns.length > 1) {
                        if (sd_default.trim().equals(columns[1].trim())) {
                            continue;
                        }
                        sdcard_path = columns[1];
                    }
                } else if (line.contains("fuse") && line.contains("/mnt/")) {
                    String columns[] = line.split(" ");
                    if (columns != null && columns.length > 1) {
                        if (sd_default.trim().equals(columns[1].trim())) {
                            continue;
                        }
                        sdcard_path = columns[1];
                    }
                }
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Log.d("text", sdcard_path);
        return sdcard_path;
    }
}</pre><br>