Android——仿京东淘宝分类页面

向右看齐 2022-06-05 08:28 240阅读 0赞

**效果图：**

**![Center][]![Center 1][]**

**json在assets下**

**![Center 2][]**

**添加依赖：**

compile 'com.squareup.okhttp3:okhttp:3.8.1'
    compile 'com.facebook.fresco:fresco:0.11.0'
    compile 'com.alibaba:fastjson:1.1.46.android'

**MainActivity**`public class MainActivity extends AppCompatActivity { private List<String> menuList = new ArrayList<>(); private List<CategoryBean.DataBean> homeList = new ArrayList<>(); private List<Integer> showTitle; private ListView lv_menu; private ListView lv_home; private MenuAdapter menuAdapter; private HomeAdapter homeAdapter; private int currentItem; private TextView tv_title; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Fresco.initialize(this); initView(); loadData(); } private void loadData() { String json = getJson(this, "category.json"); CategoryBean categoryBean = JSONObject.parseObject(json, CategoryBean.class); showTitle = new ArrayList<>(); for (int i = 0; i < categoryBean.getData().size(); i++) { CategoryBean.DataBean dataBean = categoryBean.getData().get(i); menuList.add(dataBean.getModuleTitle()); showTitle.add(i); homeList.add(dataBean); } tv_title.setText(categoryBean.getData().get(0).getModuleTitle()); menuAdapter.notifyDataSetChanged(); homeAdapter.notifyDataSetChanged(); } private void initView() { lv_menu = (ListView) findViewById(R.id.lv_menu); tv_title = (TextView) findViewById(R.id.tv_titile); lv_home = (ListView) findViewById(R.id.lv_home); menuAdapter = new MenuAdapter(this, menuList); lv_menu.setAdapter(menuAdapter); homeAdapter = new HomeAdapter(this, homeList); lv_home.setAdapter(homeAdapter); lv_menu.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { menuAdapter.setSelectItem(position); menuAdapter.notifyDataSetInvalidated(); tv_title.setText(menuList.get(position)); lv_home.setSelection(showTitle.get(position)); } }); lv_home.setOnScrollListener(new AbsListView.OnScrollListener() { private int scrollState; @Override public void onScrollStateChanged(AbsListView view, int scrollState) { this.scrollState = scrollState; } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) { return; } int current = showTitle.indexOf(firstVisibleItem); // lv_home.setSelection(current); if (currentItem != current && current >= 0) { currentItem = current; tv_title.setText(menuList.get(currentItem)); menuAdapter.setSelectItem(currentItem); menuAdapter.notifyDataSetInvalidated(); } } }); } /** * 得到json文件中的内容 * * @param context * @param fileName * @return */ public static String getJson(MainActivity context, String fileName) { StringBuilder stringBuilder = new StringBuilder(); //获得assets资源管理器 AssetManager assetManager = context.getAssets(); //使用IO流读取json文件内容 try { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader( assetManager.open(fileName), "utf-8")); String line; while ((line = bufferedReader.readLine()) != null) { stringBuilder.append(line); } } catch (IOException e) { e.printStackTrace(); } return stringBuilder.toString(); } }`

GridViewForScrollView`public class GridViewForScrollView extends GridView { public GridViewForScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public GridViewForScrollView(Context context) { super(context); } public GridViewForScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec+30); } }`

HomeAdapter`/** * 右侧主界面ListView的适配器 * * @author Administrator */ public class HomeAdapter extends BaseAdapter { private Context context; private List<CategoryBean.DataBean> foodDatas; public HomeAdapter(Context context, List<CategoryBean.DataBean> foodDatas) { this.context = context; this.foodDatas = foodDatas; } @Override public int getCount() { if (foodDatas != null) { return foodDatas.size(); } else { return 10; } } @Override public Object getItem(int position) { return foodDatas.size(); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { CategoryBean.DataBean dataBean = foodDatas.get(position); List<CategoryBean.DataBean.DataListBean> dataList = dataBean.getDataList(); ViewHold viewHold = null; if (convertView == null) { convertView = View.inflate(context, R.layout.item_home, null); viewHold = new ViewHold(); viewHold.gridView = (GridViewForScrollView) convertView.findViewById(R.id.gridView); viewHold.blank = (TextView) convertView.findViewById(R.id.blank); convertView.setTag(viewHold); } else { viewHold = (ViewHold) convertView.getTag(); } HomeItemAdapter adapter = new HomeItemAdapter(context, dataList); viewHold.blank.setText(dataBean.getModuleTitle()); viewHold.gridView.setAdapter(adapter); return convertView; } private static class ViewHold { private GridViewForScrollView gridView; private TextView blank; } }`

HomeItemAdapter`/** * author：wangzihang * date： 2017/8/8 19:15 * desctiption： * e-mail：wangzihang@xiaohongchun.com */ public class HomeItemAdapter extends BaseAdapter { private Context context; private List<CategoryBean.DataBean.DataListBean> foodDatas; public HomeItemAdapter(Context context, List<CategoryBean.DataBean.DataListBean> foodDatas) { this.context = context; this.foodDatas = foodDatas; } @Override public int getCount() { if (foodDatas != null) { return foodDatas.size(); } else { return 10; } } @Override public Object getItem(int position) { return foodDatas.size(); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { CategoryBean.DataBean.DataListBean subcategory = foodDatas.get(position); ViewHold viewHold = null; if (convertView == null) { convertView = View.inflate(context, R.layout.item_home_category, null); viewHold = new ViewHold(); viewHold.tv_name = (TextView) convertView.findViewById(R.id.item_home_name); viewHold.iv_icon = (SimpleDraweeView) convertView.findViewById(R.id.item_album); convertView.setTag(viewHold); } else { viewHold = (ViewHold) convertView.getTag(); } viewHold.tv_name.setText(subcategory.getTitle()); Uri uri = Uri.parse(subcategory.getImgURL()); viewHold.iv_icon.setImageURI(uri); return convertView; } private static class ViewHold { private TextView tv_name; private SimpleDraweeView iv_icon; } }`

MenuAdapter`/** * 左侧菜单ListView的适配器 * * @author Administrator */ public class MenuAdapter extends BaseAdapter { private Context context; private int selectItem = 0; private List<String> list; public MenuAdapter(Context context, List<String> list) { this.list = list; this.context = context; } public int getSelectItem() { return selectItem; } public void setSelectItem(int selectItem) { this.selectItem = selectItem; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int arg0) { return list.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int arg0, View arg1, ViewGroup arg2) { ViewHolder holder = null; if (arg1 == null) { holder = new ViewHolder(); arg1 = View.inflate(context, R.layout.item_menu, null); holder.tv_name = (TextView) arg1.findViewById(R.id.item_name); arg1.setTag(holder); } else { holder = (ViewHolder) arg1.getTag(); } if (arg0 == selectItem) { holder.tv_name.setBackgroundColor(Color.WHITE); holder.tv_name.setTextColor(context.getResources().getColor(R.color.green)); } else { holder.tv_name.setBackgroundColor(context.getResources().getColor(R.color.background)); holder.tv_name.setTextColor(context.getResources().getColor(R.color.black)); } holder.tv_name.setText(list.get(arg0)); return arg1; } static class ViewHolder { private TextView tv_name; } }`

activity\_main.xml`<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.bawei.com.jpushdemo.MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:baselineAligned="false" android:orientation="horizontal"> <ListView android:id="@+id/lv_menu" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:background="#EDECEC" /> <RelativeLayout android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="3" android:background="@color/white"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lv_home" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout> <TextView android:id="@+id/tv_titile" android:layout_width="match_parent" android:layout_height="35dp" android:background="#DCDBDB" android:gravity="center_vertical" android:paddingLeft="20dp" android:text="@string/app_name" /> </RelativeLayout> </LinearLayout> </RelativeLayout>`

item\_home.xml`<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/blank" android:layout_width="match_parent" android:layout_height="35dp" android:background="#DCDBDB" android:gravity="center_vertical" android:paddingLeft="20dp" android:text="@string/app_name" /> <com.bawei.com.jpushdemo.GridViewForScrollView android:id="@+id/gridView" android:layout_width="match_parent" android:layout_height="wrap_content" android:numColumns="3"></com.bawei.com.jpushdemo.GridViewForScrollView> </LinearLayout>`

item\_home\_category.xml`<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="120dp" android:orientation="vertical"> <com.facebook.drawee.view.SimpleDraweeView android:id="@+id/item_album" android:layout_width="85dp" android:layout_height="85dp" android:layout_gravity="center_horizontal" android:scaleType="centerCrop" /> <TextView android:id="@+id/item_home_name" android:layout_width="50dp" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:gravity="center" android:singleLine="true" android:text="标题" android:textSize="12dp" /> </LinearLayout> </LinearLayout>`

item\_menu.xml`<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/item_name" android:layout_width="match_parent" android:layout_height="40dp" android:text="" android:gravity="center" android:textSize="12sp" android:textColor="@color/green"/> </LinearLayout>`

请前往http://download.csdn.net/download/xy8199/10128753下载demo

[Center]: https://img-blog.csdn.net/20171122152420999?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveHk4MTk5/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: /images/20220605/2eeda4b1c73744e5af1b5d209ce0e2b5.png
[Center 2]: /images/20220605/ff327a7561344514ad96f05e5ba47596.png