返利导购网站建设需求文档,瓦房店 网站建设,2023最好用的浏览器,建站程序效果图#xff1a;需求分析#xff1a;如上图所示#xff0c;这是一个展示年级及学期的界面。年级分为三组高中、初中和小学。因学期太多若按一个一个控件的写既繁琐又不够优雅#xff0c;所以我采用 RecyclerView配合分组来实现效果。注意#xff1a;我这边是使用一个 Re… 效果图需求分析如上图所示这是一个展示年级及学期的界面。年级分为三组高中、初中和小学。因学期太多若按一个一个控件的写既繁琐又不够优雅所以我采用 RecyclerView配合分组来实现效果。注意我这边是使用一个 RecyclerView和一个 List然后Adapter使用getItemViewType将填充视图分为标题和内容两个 ItemView通过Bean中的 type 来决定加载哪个视图。因为是三列的列表所以在插入 item 时标题 item 会和内容 item 在同一行顾在插入标题 item 的时候让它跨三列即可独占一行具体实现如下实现过程xml相关文件layout xmlns:androidhttp://schemas.android.com/apk/res/android data variable namegradeBean typecn.toctec.wrongbook.grade.bean.GradeBean / data TextView android:orientationvertical android:layout_widthmatch_parent android:layout_heightwrap_content android:layout_marginTop20dp android:text{gradeBean.gradeName} android:textSize12dp android:textColorcolor/color888888 TextViewlayout标题 item.xmllayout xmlns:androidhttp://schemas.android.com/apk/res/android data variable namegradeBean typecn.toctec.wrongbook.grade.bean.GradeBean / data com.nanbox.ripplelayout.RippleLayout android:layout_widthmatch_parent android:layout_height35dp android:layout_marginTop10dp android:layout_marginLeft10dp android:layout_marginRight10dp android:backgrounddrawable/bg_grade_gray_fillet RelativeLayout android:layout_widthmatch_parent android:layout_heightmatch_parent TextView android:layout_widthwrap_content android:layout_heightwrap_content android:layout_centerHorizontaltrue android:layout_centerVerticaltrue android:text{gradeBean.gradeName} android:textColorcolor/color333333 android:textSize12dp/ RelativeLayout com.nanbox.ripplelayout.RippleLayoutlayout内容 item.xmllayout xmlns:androidhttp://schemas.android.com/apk/res/android RelativeLayout android:orientationvertical android:layout_widthmatch_parent android:layout_heightmatch_parent android:backgroundcolor/white ImageView android:onClickonBack android:layout_width18dp android:layout_height18dp android:layout_marginTop45dp android:layout_marginLeft15dp android:backgroundmipmap/ic_back/ TextView android:layout_widthwrap_content android:layout_heightwrap_content android:includeFontPaddingfalse android:layout_centerHorizontaltrue android:layout_marginTop43dp android:textstring/grade android:textColorcolor/color333333 android:textSize18dp/ androidx.recyclerview.widget.RecyclerView android:idid/gradeRv android:layout_widthmatch_parent android:layout_heightmatch_parent android:layout_marginTop94dp android:layout_marginLeft15dp android:layout_marginRight15dp/ RelativeLayoutlayoutactivity.xmlbeanpublic class GradeBean { private int gradeId; private String gradeName; private boolean gradeType; public GradeBean() { } public GradeBean(int gradeId, String gradeName, boolean gradeType) { this.gradeId gradeId; this.gradeName gradeName; this.gradeType gradeType; } public int getGradeId() { return gradeId; } public void setGradeId(int gradeId) { this.gradeId gradeId; } public String getGradeName() { return gradeName; } public void setGradeName(String gradeName) { this.gradeName gradeName; } public boolean isGradeType() { return gradeType; } public void setGradeType(boolean gradeType) { this.gradeType gradeType; } Override public String toString() { return GradeBean{ gradeId gradeId , gradeName gradeName \ , gradeType gradeType }; }}adapterpublic class GradeAdapter extends RecyclerView.AdapterBindingViewHolder { private LayoutInflater layoutInflater; private List beanList; private OnItemClickListener listener; public GradeAdapter(Context context) { layoutInflater (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); beanList new ArrayList(); } public interface OnItemClickListener { void onItemClick(GradeBean gradeBean); } public void setOnItemClickListener(OnItemClickListener listener) { this.listener listener; } /** * item 分类 */ public enum ItemType { LEVEL, //年级级别 GRADE //年级 } /** * 设置每个 item 类型 * param position * return */ Override public int getItemViewType(int position) { final GradeBean bean beanList.get(position); if (bean.isGradeType()) { return ItemType.LEVEL.ordinal(); //级别 }else { return ItemType.GRADE.ordinal(); //年级 } } NonNull Override public BindingViewHolder onCreateViewHolder(NonNull ViewGroup parent, int viewType) { ViewDataBinding binding; if (viewType ItemType.LEVEL.ordinal()) { binding DataBindingUtil.inflate(layoutInflater, R.layout.item_level, parent, false); }else { binding DataBindingUtil.inflate(layoutInflater, R.layout.item_grade_number, parent, false); } return new BindingViewHolder(binding); } Override public void onBindViewHolder(NonNull BindingViewHolder holder, int position) { final GradeBean bean beanList.get(position); holder.getBinding().setVariable(BR.gradeBean, bean); holder.getBinding().executePendingBindings(); holder.itemView.setOnClickListener(new View.OnClickListener() { Override public void onClick(View v) { if (listener ! null) { listener.onItemClick(bean); } } }); } Override public int getItemCount() { return beanList null ? 0 : beanList.size(); } public void addAll(List beans) { beanList.clear(); beanList.addAll(beans); notifyDataSetChanged(); }}activitypublic class GradeActivity extends BaseActivity { ActivityGradeBinding binding; private List gradeBeanList; private GradeAdapter adapter; Override protected void onCreate(Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); binding DataBindingUtil.setContentView(this, R.layout.activity_grade); gradeBeanList new ArrayList(); gradeBeanList.add(new GradeBean(1, 小学, true)); gradeBeanList.add(new GradeBean(2, 一年级 上, false)); gradeBeanList.add(new GradeBean(3, 一年级 下, false)); gradeBeanList.add(new GradeBean(4, 二年级 上, false)); gradeBeanList.add(new GradeBean(5, 二年级 下, false)); gradeBeanList.add(new GradeBean(6, 三年级 上, false)); gradeBeanList.add(new GradeBean(7, 三年级 下, false)); gradeBeanList.add(new GradeBean(8, 四年级 上, false)); gradeBeanList.add(new GradeBean(9, 四年级 下, false)); gradeBeanList.add(new GradeBean(10, 五年级 上, false)); gradeBeanList.add(new GradeBean(11, 五年级 下, false)); gradeBeanList.add(new GradeBean(12, 六年级 上, false)); gradeBeanList.add(new GradeBean(13, 六年级 下, false)); gradeBeanList.add(new GradeBean(14, 初中, true)); gradeBeanList.add(new GradeBean(15, 七年级 上, false)); gradeBeanList.add(new GradeBean(16, 七年级 下, false)); gradeBeanList.add(new GradeBean(17, 八年级 上, false)); gradeBeanList.add(new GradeBean(18, 八年级 下, false)); gradeBeanList.add(new GradeBean(19, 九年级 上, false)); gradeBeanList.add(new GradeBean(20, 九年级 下, false)); gradeBeanList.add(new GradeBean(21, 高中, true)); gradeBeanList.add(new GradeBean(22, 高一 上, false)); gradeBeanList.add(new GradeBean(23, 高一 下, false)); gradeBeanList.add(new GradeBean(24, 高二 上, false)); gradeBeanList.add(new GradeBean(25, 高二 下, false)); gradeBeanList.add(new GradeBean(26, 高三 上, false)); gradeBeanList.add(new GradeBean(27, 高三 下, false)); GridLayoutManager gridLayoutManager new GridLayoutManager(GradeActivity.this, 3, GridLayoutManager.VERTICAL, false); gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { Override public int getSpanSize(int position) { if (gradeBeanList.get(position).isGradeType()) { return 3; //如果是标题 item 则跨三列 } else { return 1; //如果是内容 item 则不夸咧 } } }); gridLayoutManager.setOrientation(LinearLayoutManager.VERTICAL); binding.gradeRv.setLayoutManager(gridLayoutManager); adapter new GradeAdapter(GradeActivity.this); adapter.addAll(gradeBeanList); binding.gradeRv.setAdapter(adapter); adapter.setOnItemClickListener(new GradeAdapter.OnItemClickListener() { Override public void onItemClick(GradeBean gradeBean) { Log.e(onItemClick, onItemClick: gradeBean.getGradeName()); } }); }}到这里就结束啦。往期精彩回顾Android实现短信验证码自动填充功能Android仿小红书实现长图片自动循环滚动效果Android实现头像重叠排列功能Android仿QQ个性标签功能Android仿QQ侧滑删除的功能
