Android 插拔sd广播

项目中要做媒体扫描，需要检测sd插拔事件。写了个demo分析下。

 mReceiver = new BroadcastReceiver() {
	            @Override
	            public void onReceive(Context context, Intent intent) {
	                onReceiveMediaBroadcast(intent);
	            }
	        };

//onReceive方法：
	private void onReceiveMediaBroadcast(Intent intent) {
	        String action = intent.getAction();
	        if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {
	        	Log.i(Intent.ACTION_MEDIA_MOUNTED);
	        } else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED)) {
	        	Log.i(Intent.ACTION_MEDIA_UNMOUNTED);
	        } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)) {
	        	Log.i(Intent.ACTION_MEDIA_SCANNER_STARTED);
	        } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) {
	        	Log.i(Intent.ACTION_MEDIA_SCANNER_FINISHED);
	        } else if (action.equals(Intent.ACTION_MEDIA_BAD_REMOVAL)) {
	        	Log.i(Intent.ACTION_MEDIA_BAD_REMOVAL);
	        }
	        else if (action.equals(Intent.ACTION_MEDIA_EJECT)) {
	        	Log.i(Intent.ACTION_MEDIA_EJECT);
	        }
	        else if (action.equals(Intent.ACTION_MEDIA_REMOVED)) {
	        	Log.i(Intent.ACTION_MEDIA_REMOVED);
	        }
	    }

	//注册广播接收器：
	        IntentFilter intentFilter = new IntentFilter();
	        intentFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
	        intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
	        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
	        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
	        intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);
	        intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);
	        intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);
	        intentFilter.addDataScheme("file");
	        registerReceiver(mReceiver, intentFilter);

log信息：
插卡：系统打出来的状态，{removed}->{unmounted}->{checking}->{mounted}
我的程序打印信息，android.intent.action.MEDIA_UNMOUNTED->android.intent.action.MEDIA_MOUNTED
->android.intent.action.MEDIA_SCANNER_STARTED->android.intent.action.MEDIA_SCANNER_FINIDHED
拔卡：系统打出来的状态，{mounted}->{umounted}->{removed}
我的程序打印信息，android.intent.action.MEDIA_EJECT->android.intent.action.MEDIA_UNMOUNTED
->android.intent.action.MEDIA_REMOVED