Android系统下监听SD卡的插入并读取内容

//自己写一个广播监听函数  
private final BroadcastReceiver broadcastRec =  new BroadcastReceiver() {
 
        @Override
        public void onReceive(Context context,Intent intent) {
            if(intent.getAction().equals("android.intent.action.MEDIA_MOUNTED"))//SD卡已经成功挂载
             {               
                imagepath = android.os.Environment.getExternalStorageDirectory();//你的SD卡路径                   
                }
                  
             }else if(intent.getAction().equals("android.intent.action.MEDIA_REMOVED")//各种未挂载状态
                     ||intent.getAction().equals("android.intent.action.ACTION_MEDIA_UNMOUNTED")
                     ||intent.getAction().equals("android.intent.action.ACTION_MEDIA_BAD_REMOVAL"))
             {
                 imagepath = android.os.Environment.getDataDirectory();//你的本地路径
             }
        }
    };
 
 
//在IntentFilter中选择你要监听的行为
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);
 
        intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
 
        intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);
 
        //intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);
 
        intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);
 
        //intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
 
        //intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
 
        intentFilter.addDataScheme("file");
     
             registerReceiver(broadcastRec,intentFilter);//注册监听函数
 
unregisterReceiver(broadcastRec);//使用完注销广播监听函数