Android各种机型，各种系统版本，怎么获取外置SDCard路径

由于项目需要，在有外置sdcard的情况下，可能不希望直接将应用内数据存入内置sdcard，我于是专门写了一个函数来获取sdcard路径

如果有外置sdcard就获取外置sdcard，如果没有就用系统默认的"外置sdcard"（深入研究可能知道，这个外置sdcard实际是从内置sdcard里面分出来的一个分区而已）

下面直接上代码:

public static String getSDCardPath(){		String cmd = "cat /proc/mounts";        Runtime run = Runtime.getRuntime();        BufferedInputStream in=null;        BufferedReader inBr=null;        try {            Process p = run.exec(cmd);            in = new BufferedInputStream(p.getInputStream());            inBr = new BufferedReader(new InputStreamReader(in));            String lineStr;            while ((lineStr = inBr.readLine()) != null) {            Log.i("CommonUitls", lineStr);                if (lineStr.toLowerCase().contains("sdcard".toLowerCase())                        && lineStr.contains(".android_secure")) {                    String[] strArray = lineStr.split(" ");                    if (strArray != null && strArray.length >= 5) {                        String result = strArray[1].replace("/.android_secure",                                "");                        Log.i("CommonUitls", result);                        return result;                    }                }                if(lineStr.toLowerCase().contains("extsd".toLowerCase())){                	String[] strArray = lineStr.split(" ");                	Log.i("CommonUitls", strArray[1]);                	return strArray[1];                }                if (p.waitFor() != 0 && p.exitValue() == 1) {                	Log.e("CommonUitls", "CMD cat /proc/mounts ERROR!");                }            }        } catch (Exception e) {        	e.printStackTrace();        	Log.e("CommonUitls", e.toString());        }finally{            try {	            if(in!=null){	               in.close();	            }            } catch (IOException e) {            	// TODO Auto-generated catch block            	e.printStackTrace();            	Log.e("CommonUitls", e.toString());            }		    try {		        if(inBr!=null){		        	inBr.close();		         }			} catch (IOException e) {				// TODO Auto-generated catch block				e.printStackTrace();				Log.e("CommonUitls", e.toString());			}	    }        return Environment.getExternalStorageDirectory().getPath();	}