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）

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

获取路径代码（MainActivity.java文件）

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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

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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

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内置SD卡路径：/storage/emulated/0

android系统可通过Environment.getExternalStorageDirectory()获取存储卡的路径，但是现在有很多手机内置有一个存储空间，同时还支持外置sd卡插入，这样通过Environment.getExternalStorageDirectory()方法获取到的就是内置存储卡的位置，需要获取外置存储卡的路径就比较麻烦，这里借鉴网上的代码，稍作修改，在已有的手机上做了测试，效果还可以，当然也许还有其他的一些奇葩机型没有覆盖到。

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);
}
// 得到路径
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;
}
}

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