ViewPager+Fragment+广播来实现一个滑动页面切换_html/css_WEB-ITnose

要实现这样一个页面，上面的好说，下面的是一个滑动视图，我们想到的是用viewpager来实现，但是这个有一个问题，按照平时的写法，我们会写5个Activity放到viewpager里面去，这自然是可以实现的。但是这里有一个问题，一进来，在主界面manager.startActivity(id, intent).getDecorView();来取得view加到viewpager里，这样一启动，五个子界面都同时启动，都去加载数据，会导致很卡，也浪费了资源，我们想法是，默认只加载第一个页面，滑到第二个才开始加载第二个的数据，但是通过监听事件发现，一开始启动，五个Activity的oncreate方法都运行了。再滑动切换，是没有任何监听或者实现方法得到调用的。

这里后来想到了另外一个方法：我们用viewpager+5个Fragment+广播机制去通知他更新。

在主界面我们可以这样写。

/**	 * 初始化PageViewer	 */	List list;	FragmentPagerAdapter myPagerAdapter;	FragmentManager SupportfragmentManager = getSupportFragmentManager();	private void initPagerViewer(){		Label1AllOrder lable1 = new Label1AllOrder();		Label2WinPrizeOrder lable2 = new Label2WinPrizeOrder();		Label3WaitForLotteryOrder lable3 = new Label3WaitForLotteryOrder();		Label4ZhuiHaoOrder lable4 = new Label4ZhuiHaoOrder();		Label5BuyTogetherOrder lable5 = new Label5BuyTogetherOrder();				list = new ArrayList();  		list.add(lable1);		list.add(lable2);		list.add(lable3);		list.add(lable4);		list.add(lable5);				myPagerAdapter = new MyPagerAdapter(SupportfragmentManager);        view_pager.setAdapter(myPagerAdapter);         view_pager.setOnPageChangeListener(new MyOnPageChangeListener()); 	}	/**	 * Pager适配器	 */	public class MyPagerAdapter extends FragmentPagerAdapter {		public MyPagerAdapter(FragmentManager fm) {			super(fm);		}		@Override		public Fragment getItem(int arg0) {			return list.get(arg0);  		}		@Override		public int getCount() {			return list.size();		}				/*@Override		public Object instantiateItem(View arg0, int arg1) {			//ViewPager pViewPager = ((ViewPager) arg0);			//pViewPager.addView(list.get(arg1).getView());			return list.get(arg1);		}				@Override		public void destroyItem(ViewGroup container, int position, Object object) {			//ViewPager pViewPager = ((ViewPager) container);			//pViewPager.removeView(list.get(position).getView());		}*/	}		private void sendBroadcastDoRefreshByCurrentIndex(){		switch (currentIndex) {		case 0:			sendBroadcastDoRefresh("action.Label1AllOrder");			break;		case 1:			sendBroadcastDoRefresh("action.Label2WinPrizeOrder");			break;		case 2:			sendBroadcastDoRefresh("action.Label3WaitForLotteryOrder");			break;		case 3:			sendBroadcastDoRefresh("action.Label4ZhuiHaoOrder");			break;		case 4:			sendBroadcastDoRefresh("action.Label5BuyTogetherOrder");			break;		default:			break;		}	}		Intent broadCastIntent = new Intent();	// 广播通知	private void sendBroadcastDoRefresh(String action){		broadCastIntent.setAction(action);        sendBroadcast(broadCastIntent);	}		/**	 * 页卡切换监听	 */		private int currentIndex = 0;	public class MyOnPageChangeListener implements OnPageChangeListener {		@Override		public void onPageSelected(int index) {			currentIndex = index;			System.out.println("-onPageSelected--------" + index);			initViewPagePoint(index);			switch (index) {			case 0:				sendBroadcastDoRefresh("action.Label1AllOrder");				view_pager_tip.setText("全部订单");				break;			case 1:				sendBroadcastDoRefresh("action.Label2WinPrizeOrder");				view_pager_tip.setText("中奖订单");				break;			case 2:				sendBroadcastDoRefresh("action.Label3WaitForLotteryOrder");				view_pager_tip.setText("待开奖订单");				break;			case 3:				sendBroadcastDoRefresh("action.Label4ZhuiHaoOrder");				view_pager_tip.setText("追号订单");				break;			case 4:				sendBroadcastDoRefresh("action.Label5BuyTogetherOrder");				view_pager_tip.setText("合买订单");				break;			default:				break;			}		}		@Override		public void onPageScrollStateChanged(int arg0) {			 		}		@Override		public void onPageScrolled(int arg0, float arg1, int arg2) {		}	}

每滑动一下，就发送广播，通知子界面去更新。但是是不是每次更新就有他自己控制了

在五个子Fragment我们可以这样写：其实这里五个是相似了。我就贴一个的代码

public class Label2WinPrizeOrder extends Fragment implements OnClickListener {	Activity activity = Label2WinPrizeOrder.this.getActivity();		 	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);				LayoutInflater inflater = getActivity().getLayoutInflater();		mainView = inflater.inflate(R.layout.my_lottery_user_center_label2_win_prize, (ViewGroup)getActivity().findViewById(R.id.my_lottery_user_center_viewpage), false);		initUI();		 				initNoDataUI();				//注册刷新广播		IntentFilter intentFilter = new IntentFilter();		intentFilter.addAction("action.Label2WinPrizeOrder");		getActivity().registerReceiver(mRefreshBroadcastReceiver, intentFilter);						 	}		@Override      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)  { 		ViewGroup p = (ViewGroup) mainView.getParent();		if(p!=null){			p.removeAllViewsInLayout();		}				return mainView;     }			@Override	public void onActivityCreated(Bundle savedInstanceState) {		super.onActivityCreated(savedInstanceState);	}		 		// broadcast receiver	private BroadcastReceiver mRefreshBroadcastReceiver = new BroadcastReceiver() {		@Override		public void onReceive(Context context, Intent intent) {			String action = intent.getAction();			if (action.equals("action.Label2WinPrizeOrder")) {				System.out.println("---------------action.Label2WinPrizeOrder"); 							if (AutoUpdate.isNetworkAvailable(activity)) {					if(canLoadAgain){						loadingRelativelayout.setVisibility(View.VISIBLE);						noDataLinearlayout.setVisibility(View.GONE);						hasDataLinearlayout.setVisibility(View.GONE);												updateInitLotteryInfo();												page = 0;						mListView.mEndRootView.setVisibility(View.GONE);						mListView.setAutoLoadMore(true);						mListView.setCanRefresh(true);						new getDataTask().execute(1);					}				}								setK3ballVisible();			}		}	};	//初设化彩种信息	private void updateInitLotteryInfo(){		if(MyLotterActivity.labelsListData != null && MyLotterActivity.labelsListData.size() >= 2){			MyLotteryLabelBean bean = MyLotterActivity.labelsListData.get(1);			if(FunctionUtil.strNotNull(bean.getLottery_type_index())){				if("308".equals(bean.getLottery_type_index())){					lottery_type_index = 308;				}else if("309".equals(bean.getLottery_type_index())){					lottery_type_index = 309;				}else if("310".equals(bean.getLottery_type_index())){					lottery_type_index = 310;				}			}						if(FunctionUtil.strNotNull(bean.getTitle())){				title = bean.getTitle();			}						tipTextview.setText(title);		}	}		private void initUI() {		activity = getActivity();		loadingRelativelayout = (LinearLayout) mainView.findViewById(R.id.my_lottery_user_center_label2_loading_rel);		loadAgainRelativelayout = (RelativeLayout) mainView.findViewById(R.id.my_lottery_user_center_label2_load_again_rel);		hasDataLinearlayout = (LinearLayout) mainView.findViewById(R.id.my_lottery_user_center_label2_has_data_linear);		noDataLinearlayout = (LinearLayout) mainView.findViewById(R.id.my_lottery_user_center_label2_no_data_linear);

	}

这样。我们每次滑动一次就能在五个子类，得到一次广播通知。就让他去加载数据，当第二次在滑动到那个，他依然可以收到广播，至于要不要再去刷新数据，就看你怎么控制了。