Android获取系统外置存储卡路径的方法

android系统可通过Environment.getExternalStorageDirectory()获取存储卡的路径。可是如今有非常多手机内置有一个存储空间。同一时候还支持外置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。须要获取外置存储卡的路径就比較麻烦，这里借鉴网上的代码，稍作改动，在已有的手机上做了測试。效果还能够。当然或许还有其它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;
	}
}