Android判断SD卡是否已经挂载的方法

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