学步园

http://blog.csdn.net/roserose0002/article/details/8080495

http://www.cyqdata.com/android/article-detail-36281

http://www.eoeandroid.com/thread-183532-1-1.html (not verified)

1.获取对象：

 mStorageManager = (StorageManager)mActivity 
                    .getSystemService(Activity.STORAGE_SERVICE); 

2.获取方法：

method = Class.forName("android.os.storage.StorageManager").getMethod("getVolumePaths");

或者...

3.调用方法：

paths = (String[]) method.invoke(mStorageManager);

package com.android.Wecfct.sdcard;

import java.lang.reflect.InvocationTargetException; 
import java.lang.reflect.Method; 
 
import android.app.Activity; 
import android.os.storage.StorageManager;

public class StorageList { 
    private Activity mActivity; 
    private StorageManager mStorageManager; 
    private Method mMethodGetPaths; 
    private Method mMethodGetStatus; 
    String[] paths;
     
    public StorageList(Activity activity) { 
        mActivity = activity; 
        if (mActivity != null) { 
            mStorageManager = (StorageManager)mActivity 
                    .getSystemService(Activity.STORAGE_SERVICE); 
            try { 
               mMethodGetPaths = mStorageManager.getClass() 
                        .getMethod("getVolumePaths"); 
                mMethodGetStatus = mStorageManager.getClass() 
                        .getMethod("getVolumeState",String.class); 
            } catch (NoSuchMethodException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
     
    public String[] getVolumePaths() { 
       // String[] paths = null; 
        try { 
            paths = (String[]) mMethodGetPaths.invoke(mStorageManager); 
            System.out.println("reflect patha:"+paths[0]);
            System.out.println("reflect pathb:"+paths[1]);
        } catch (IllegalArgumentException e) { 
            e.printStackTrace(); 
        } catch (IllegalAccessException e) { 
            e.printStackTrace(); 
        } catch (InvocationTargetException e) { 
            e.printStackTrace(); 
        } 
        return paths; 
    } 
    
    public String getVolumeState(String mountPoint) {
    	String status = null; 
         
    	 try
			{
				String tt = "/mnt/external_sdcard";
				status = (String) (mMethodGetStatus.invoke(mStorageManager,"/mnt/external_sdcard"));
/*				System.out.println(tt);
				System.out.println(paths[1]);*/
				//status = (String) (mMethodGetStatus.invoke(mStorageManager,paths[1]));
			} catch (IllegalArgumentException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IllegalAccessException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (InvocationTargetException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			} 
    	 
             System.out.println("reflect status:"+status);
   
              return status;
   }
    
    
} 

ps:

transfer "/mnt/external_sdcard" to getVolumeStatus(), not "/mnt/external_sdcard/"