ViewPager Fragment broadcast to implement a sliding page switching_html/css_WEB-ITnose

To implement such a page, the above is easy to say, and the following is a sliding view, What we think of is to use viewpager to implement it, but there is a problem with this. According to the usual writing method, we will write 5 activities and put them in viewpager, which can naturally be achieved. But there is a problem here. Once you come in, go to the main interface manager.startActivity(id, intent).getDecorView(); to get the view and add it to the viewpager. Once started, the five sub-interfaces will start at the same time and load data. It causes a lot of lag and wastes resources. Our idea is to only load the first page by default, and only start loading the data of the second page after sliding to the second page. However, through monitoring events, we found that at the beginning, the oncreate of five activities All methods are run. When sliding to switch again, no monitoring or implementation methods are called.

I later thought of another method: we use the viewpager 5 Fragment broadcast mechanism to notify him of updates.

In the main interface we can write like this.

/**	 * 初始化PageViewer	 */	List<Fragment> 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<Fragment>();  		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) {		}	}

Every time you slide, a broadcast is sent to notify the sub-interface to update. But does it have its own control every time it is updated?

In the five sub-Fragments, we can write like this: In fact, the five here are similar. I will post a code

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);

<span style="white-space:pre">	</span>}

like this. Every time we swipe, we can get a broadcast notification in five subcategories. Just let him load the data. When he slides to that point for the second time, he can still receive the broadcast. As for whether to refresh the data again, it depends on how you control it.