android viewpager+fragment 避免预加载，缓存

<span style="color:#ff6666;">注意：setUserVisibleHint，使用这个方法来完成切换到哪一页才加载哪一页</span>

/*** 育儿知识tab栏** @author Administrator**/public class GestateKnowledgeBabyTabFragment extends TabBaseFragment implements LmbRequestCallBack {/** tab对应的帮的数据源 */private GestateBabyDataItem babyDataItem;/** tab对应帮分类Id */private int babyTabId;/** 缓存当前fragment显示的view，用以当销毁view但fragment没销毁时的回复 */private View cacheFragmentView;/** 当前fragment是否是可见的 */private boolean isFragmentVisible;/** 是否已经加载了view,若已经加载了，不会再执行 */private boolean isPrepared;/**** @Description :* @author:zhongwr* @param :babyTabId tab对应的id,不能为空* @param :categoryBangList 如果不为空则数据已经加载过，不用再次请求，如果为空，表示数据没请求过，则请求网络获取数据* @return :void*/public static GestateKnowledgeBabyTabFragment newInstance(int babyTabId, GestateBabyDataItem babyDataItem) {GestateKnowledgeBabyTabFragment bangFragment = new GestateKnowledgeBabyTabFragment();Bundle argsBundle = new Bundle();argsBundle.putInt("babyTabId", babyTabId);argsBundle.putSerializable("babyDataItem", babyDataItem);bangFragment.setArguments(argsBundle);return bangFragment;}/*** isVisibleToUser:true:表示该UI可以被当前用户可见;false:表示不可见 是在oncreateView之前执行**<span style="color:#ff0000;"> 执行顺序，用于预加载时，不会执行，第二次执行可见时，由于不会执行oncreateView，所以用此来加载第二次获取 setUserVisibleHint false--setUserVisibleHint* true--onAttach--onCreate--onCreateView--onActivityCreated--onResume()</span>*/@Overridepublic void setUserVisibleHint(boolean isVisibleToUser) {super.setUserVisibleHint(isVisibleToUser);// 直接使用isVisibleToUser不准确isFragmentVisible = getUserVisibleHint();// 第一次加载fragment(由于是viewpager可能是预加载，导致isFragmentVisible=false不可见)并执行此方法时，// mactivity==null,当滑动选中，此时activity已经赋值，并且isFragmentVisible=true,再次执行这方法时不会执行oncreateViewif (null != activity && isFragmentVisible && !isPrepared) {onCreateContentView(LayoutInflater.from(activity), null);}}@Overridepublic View onCreateViewComplete(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {Logcat.dLog("isFragmentVisible = " + isFragmentVisible);Logcat.dLog("babyTabId = " + babyTabId);if (null == cacheFragmentView && isFragmentVisible) {isPrepared = true;View view = cacheFragmentView = inflater.inflate(R.layout.gestate_baby_knowledge_fragment, null);activity = getActivity();initView(view);initListener();initData();}return cacheFragmentView;}private void initView(View view) {}/**** @description 更新数据* @author zhongwr* @update 2015-11-28 下午6:17:49*/private void updateViewData(GestateBabyDataItem babyDataItem) {if (null != babyDataItem) {setClickToReloadGone();// 宝宝变化if (null != babyDataItem.bbchange_data && !Tools.isEmpty(babyDataItem.bbchange_data.title)) {llBabyChangeParent.setVisibility(View.VISIBLE);tvBabyChangeContent.setText(babyDataItem.bbchange_data.text);tvBabyChangeTitle.setText(babyDataItem.bbchange_data.title);} else {llBabyChangeParent.setVisibility(View.GONE);}// 营养提醒if (null != babyDataItem.nutrition_data && !Tools.isEmpty(babyDataItem.nutrition_data.title)) {llNutritionParent.setVisibility(View.VISIBLE);tvNutritionContent.setText(babyDataItem.nutrition_data.text);tvNutritionTitle.setText(babyDataItem.nutrition_data.title);} else {llNutritionParent.setVisibility(View.GONE);}// 早教时间if (null != babyDataItem.early_data && !Tools.isEmpty(babyDataItem.early_data.title)) {llEarlyParent.setVisibility(View.VISIBLE);tvEarlyContent.setText(Html.fromHtml(babyDataItem.early_data.text));tvEarlyTitle.setText(babyDataItem.early_data.title);setViewOnClickListener(llEarlyParent, babyDataItem.early_data.id);} else {llEarlyParent.setVisibility(View.GONE);}// 月子餐if (null != babyDataItem.month_data && !Tools.isEmpty(babyDataItem.month_data.title)) {llConfinementParent.setVisibility(View.VISIBLE);tvConfinementTitle.setText(babyDataItem.month_data.title);tvConfinementContentTitle.setText(babyDataItem.month_data.small_title);tvConfinementContent.setText(Html.fromHtml(babyDataItem.month_data.text));imageLoader.displayImage(babyDataItem.month_data.pic, ivConfinementHeadPic, options565);setViewOnClickListener(llConfinementParent, babyDataItem.month_data.id);} else {llConfinementParent.setVisibility(View.GONE);}// 编辑推荐阅读if (null != babyDataItem.tuijian_data && !Tools.isEmpty(babyDataItem.tuijian_data.title)) {llRecommendedParent.setVisibility(View.VISIBLE);tvRecommendedTitle.setText(babyDataItem.tuijian_data.title);tvRecommendedContentTitle.setText(babyDataItem.tuijian_data.small_title);tvRecommendedContent.setText(Html.fromHtml(babyDataItem.tuijian_data.text));setBigImageView(babyDataItem.tuijian_data.pic, ivRecommendedPic);setViewOnClickListener(llRecommendedParent, babyDataItem.tuijian_data.id);} else {llRecommendedParent.setVisibility(View.GONE);}// 专家导读if (null != babyDataItem.expert_data && !Tools.isEmpty(babyDataItem.expert_data.title)) {llExpertParent.setVisibility(View.VISIBLE);tvExpertTitle.setText(babyDataItem.expert_data.title);tvExpertContentTitle.setText(babyDataItem.expert_data.small_title);tvExpertContent.setText(babyDataItem.expert_data.text);imageLoader.displayImage(babyDataItem.expert_data.pic, ivExpertHeadPic, options565);setViewOnClickListener(llExpertParent, babyDataItem.expert_data.id);} else {llExpertParent.setVisibility(View.GONE);}// 专家视频if (null != babyDataItem.expert_video_data && !Tools.isEmpty(babyDataItem.expert_video_data.title)) {llVideoParent.setVisibility(View.VISIBLE);tvVideoTitle.setText(babyDataItem.expert_video_data.title);tvVideoContent.setText(babyDataItem.expert_video_data.small_title);setBigImageView(babyDataItem.expert_video_data.pic, ivVideoPic);setViewOnClickListener(ivVideoPlay, babyDataItem.expert_video_data.id);} else {llVideoParent.setVisibility(View.GONE);}addTagView(babyDataItem.tag_data, flowLayoutTag);} else {setLoadDataEmpty();}}/***** @description 月子餐、专家导读、专家视频跳转监听器* @author zhongwr* @update 2015-11-30 下午6:09:53*/private void setViewOnClickListener(View view, final String id) {view.setTag(id);view.setOnClickListener(clickViewJumpListener);}/** 月子餐、专家导读、专家视频跳转监听器 */private OnClickListener clickViewJumpListener = new OnClickListener() {@Overridepublic void onClick(View v) {String id = (String) v.getTag();}};/**** @description 设置tag标签* @author zhongwr* @update 2015-11-12 下午6:18:07*/private void addTagView(GestateBabyTagContainerItem containerItem, FlowLayout flowLayoutTag) {if (null == containerItem || Tools.isEmpty(containerItem.title) || Tools.isListEmpty(containerItem.list)) {llTagParent.setVisibility(View.GONE);return;}List<GestateBabyTagItem> tagList = containerItem.list;flowLayoutTag.removeAllViews();llTagParent.setVisibility(View.VISIBLE);tvTagTitle.setText(containerItem.title);TextView bt = null;int padding = Tools.dip2px(activity, 12);GestateBabyTagItem tagItem;for (int i = 0; i < tagList.size(); i++) {tagItem = tagList.get(i);bt = new TextView(activity);bt.setText(tagItem.small_title != null ? tagItem.small_title : "未知");bt.setTextColor(getResources().getColor(R.color.red1));bt.setGravity(Gravity.CENTER);bt.setBackgroundResource(R.drawable.preg_tag_bg);bt.setTextSize(13);bt.setPadding(padding, 0, padding, 0);bt.setTag(tagItem);final String tagId = tagItem.id;final String title = tagItem.small_title;bt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {KnowledgeLabelDetailActivity.startKnowledgeLabelDetailAct(activity, tagId, title, "1", null);}});flowLayoutTag.addView(bt);}}private void initListener() {setReloadListener(new Reload() {// 出错重新加载@Overridepublic void OnReloadClick(View view) {requestBabyKnowledgeData();}});}private void initData() {Bundle argsBundle = getArguments();if (null != argsBundle) {babyTabId = argsBundle.getInt("babyTabId", 1);babyDataItem = (GestateBabyDataItem) argsBundle.getSerializable("babyDataItem");}if (null == babyDataItem) {requestBabyKnowledgeData();} else {updateViewData(babyDataItem);}}}

/*** 各类tab通用一个Basefragment ： 比如 各类帮的tab：同城、爱购、生活、辣妈、孕育 ： 功能： 出错机制处理** @author Administrator**/public abstract class TabBaseFragment extends BaseFragment {public ClickScreenToReload clickToReload;private FrameLayout mViewContainer;@Overridepublic void onAttach(Activity activity) {super.onAttach(activity);this.activity = activity;}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {if (null == mViewContainer) {View view = inflater.inflate(R.layout.mam_base_main, null);mViewContainer = (FrameLayout) view.findViewById(R.id.base_container);}onCreateContentView(inflater, savedInstanceState);return mViewContainer;}public void onCreateContentView(LayoutInflater inflater, Bundle savedInstanceState) {if (null != mViewContainer) {mViewContainer.removeAllViews();RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT);clickToReload = new ClickScreenToReload(activity);clickToReload.setVisibility(View.GONE);View viewContent = onCreateViewComplete(inflater, mViewContainer, savedInstanceState);if (null != viewContent) {mViewContainer.addView(viewContent, lp);}mViewContainer.addView(clickToReload, lp);}}@Overridepublic void onDestroyView() {super.onDestroyView();ViewGroup parent = (ViewGroup) mViewContainer.getParent();if (null != parent) {// 必须先清除父布局中的child，否则会报错“当前父布局已经有了一个child，不能再添加”mViewContainer.removeAllViewsInLayout();parent.removeView(mViewContainer);}}/***** @description 创建view* @author zhongwr* @update 2015-11-4 下午5:27:36*/public abstract View onCreateViewComplete(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState);/**** @description 设置网络不可见，点击重新加载* @author zhongwr* @update 2015-11-4 下午5:07:12*/protected void setReloadVisiable() {clickToReload.setVisibility(View.VISIBLE);clickToReload.setloadfail();}/**** @description 设置加载数据为空* @author zhongwr* @update 2015-11-4 下午5:07:12*/protected void setLoadDataEmpty() {clickToReload.setVisibility(View.VISIBLE);clickToReload.setloadEmpty();}/**** @description 设置正在加载* @author zhongwr* @update 2015-11-4 下午5:08:29*/protected void setLoadingVisiable() {clickToReload.setVisibility(View.VISIBLE);clickToReload.setLoading();}/**** @description 隐藏这个出错界面* @author zhongwr* @update 2015-11-4 下午5:09:24*/protected void setClickToReloadGone() {clickToReload.setVisibility(View.GONE);}/**** @description 重新加载的监听器* @author zhongwr* @update 2015-11-4 下午5:32:44*/protected void setReloadListener(Reload reloadListener) {clickToReload.setReloadClick(reloadListener);}/** 屏幕的三分之一 */private int screenWidthThirdOne = Tools.getScreenSize(activity).x / 3;/**** @description 适配图片大图：图片布局除了间距显示宽度充满整个屏幕* @author zhongwr* @update 2015-11-13 上午11:32:08*/protected void setBigImageView(String picUrl, final ImageView ivPic) {imageLoader.displayImage(picUrl, ivPic, options565, new SimpleImageLoadingListener() {@Overridepublic void onLoadingComplete(String imageUri, final View view, final Bitmap loadedImage) {if (null != loadedImage) {// 设置成背景，清除src否则重叠ivPic.post(new Runnable() {@Overridepublic void run() {int ivMeasureWidth = ivPic.getMeasuredWidth();LayoutParams params = ivPic.getLayoutParams();int bmWidth = loadedImage.getWidth();if (bmWidth < screenWidthThirdOne) {// 处理小图params.height = LayoutParams.WRAP_CONTENT;params.width = bmWidth;} else if (ivMeasureWidth > 0) {// 按原图的比例缩放params.height = ivMeasureWidth * loadedImage.getHeight() / bmWidth;params.width = ivMeasureWidth;}ivPic.setBackgroundDrawable(null);ivPic.setImageDrawable(new BitmapDrawable(loadedImage));}});} else {ivPic.setImageDrawable(null);// 设置成背景，清除src否则重叠ivPic.setBackgroundResource(R.drawable.default_user_head);}}@Overridepublic void onLoadingFailed(String imageUri, View view, FailReason failReason) {ivPic.setImageDrawable(null);// 设置成背景，清除src否则重叠ivPic.setBackgroundResource(R.drawable.default_user_head);}});}}