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HarmonyOS官方模板學(xué)習(xí)之Category Ability(Java)

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Category Ability(Java)

介紹

使用Java語(yǔ)言開(kāi)發(fā)，用于Phone設(shè)備的Feature Ability模板，使用XML布局，顯示分類(lèi)頁(yè)效果。

搭建環(huán)境

安裝DevEco Studio，詳情請(qǐng)參考DevEco Studio下載。

設(shè)置DevEco Studio開(kāi)發(fā)環(huán)境，DevEco Studio開(kāi)發(fā)環(huán)境需要依賴(lài)于網(wǎng)絡(luò)環(huán)境，需要連接上網(wǎng)絡(luò)才能確保工具的正常使用，可以根據(jù)如下兩種情況來(lái)配置開(kāi)發(fā)環(huán)境：

如果可以直接訪(fǎng)問(wèn)Internet，只需進(jìn)行下載HarmonyOS SDK操作。

如果網(wǎng)絡(luò)不能直接訪(fǎng)問(wèn)Internet，需要通過(guò)代理服務(wù)器才可以訪(fǎng)問(wèn)，請(qǐng)參考配置開(kāi)發(fā)環(huán)境。

代碼結(jié)構(gòu)解讀

注意：'#'代表注釋

功能邏輯代碼

 
 
 
   
  
  
  ├─java   
  
  
  │  └─com   
  
  
  │      └─buty   
  
  
  │          └─categoryabilityjava   
  
  
  │              │  MainAbility.java   
  
  
  │              │  MyApplication.java   
  
  
  │              │   
  
  
  │              ├─data   
  
  
  │              │      CategoryData.java #用來(lái)構(gòu)造分類(lèi)數(shù)據(jù)   
  
  
  │              │   
  
  
  │              ├─model   
  
  
  │              │      CategoryList.java #分類(lèi)列表模型   
  
  
  │              │      Item.java #子項(xiàng)模型   
  
  
  │              │      ItemChild.java #小子項(xiàng)模型   
  
  
  │              │      ItemList.java #子項(xiàng)列表模型   
  
  
  │              │   
  
  
  │              ├─provider   
  
  
  │              │      CategoryListProvider.java #繼承自BaseItemProvider為L(zhǎng)istContainer提供數(shù)據(jù)   
  
  
  │              │   
  
  
  │              ├─slice   
  
  
  │              │      MainAbilitySlice.java #主頁(yè)片   
  
  
  │              │   
  
  
  │              ├─utils   
  
  
  │              │      ElementUtil.java #獲取element顏色值，   
  
  
  │              │      LogUtils.java #日志工具類(lèi)   
  
  
  │              │      Toast.java #Toast工具類(lèi)   
  
  
  │              │   
  
  
  │              └─view   
  
  
  │                      GridAdapter.java #grid適配器，適配不同的gridview   
  
  
  │                      GridView.java #自定義組件，類(lèi)似grid，繼承自TableLayout并且實(shí)現(xiàn)Component.LayoutRefreshedListener   
  
  
  │

布局及樣式代碼

 
 
 
   
  
  
  └─resources   
  
  
      ├─base   
  
  
      │  ├─element   
  
  
      │  │      color.json   
  
  
      │  │      float.json   
  
  
      │  │      string.json   
  
  
      │  │   
  
  
      │  ├─graphic   
  
  
      │  │      background_ability_main.xml   
  
  
      │  │      background_item_grid_per.xml   
  
  
      │  │      background_search_bar.xml   
  
  
      │  │   
  
  
      │  ├─layout   
  
  
      │  │      ability_main.xml  #主頁(yè)面   
  
  
      │  │      category_list_per.xml #每個(gè)分類(lèi)組件   
  
  
      │  │      item_child_per.xml #分類(lèi)下面的子類(lèi)別   
  
  
      │  │      item_child_per_grid_per.xml #子類(lèi)別下的網(wǎng)格項(xiàng)組件   
  
  
      │  │      item_grid_per.xml #分類(lèi)下面的網(wǎng)格項(xiàng)   
  
  
      │  │      search_bar.xml #search組件   
  
  
      │  │      tab.xml #單個(gè)tab組件   
  
  
      │  │      title_bar.xml #標(biāo)題組件   
  
  
      │  │   
  
  
      │  ├─media   
  
  
      │  │      addIcon.png   
  
  
      │  │      icon.png   
  
  
      │  │      icon_actived.png   
  
  
      │  │      icon_normal.png   
  
  
      │  │      rightIcon.png   
  
  
      │  │      searchIcon.png   
  
  
      │  │   
  
  
      │  └─profile   
  
  
      ├─en   
  
  
      │  └─element   
  
  
      │          string.json   
  
  
      │   
  
  
      ├─rawfile   
  
  
      └─zh   
  
  
          └─element   
  
  
                  string.json

效果展示

我們先看一下運(yùn)行起來(lái)的效果

頁(yè)面布局

1.ability_main.xml #主頁(yè)面

頁(yè)面的布局包括DependentLayout和DirectionalLayout布局。

包括ListContainer、ScrollView、自定義的GridView 等組件

還使用了include標(biāo)簽來(lái)導(dǎo)入預(yù)設(shè)的組件，導(dǎo)入了search組件和標(biāo)題組件。

2.category_list_per.xml #每個(gè)分類(lèi)組件

分類(lèi)組件比較簡(jiǎn)單，DirectionalLayout包含一個(gè)Text。

 
 
 
   
  
  
     
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:height="match_content"   
  
  
      ohos:width="match_parent"   
  
  
      ohos:bottom_margin="$float:defaultMargin"   
  
  
      ohos:orientation="vertical"   
  
  
      ohos:top_margin="$float:defaultMargin">   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:categoryListPerText"   
  
  
          ohos:height="match_parent"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:bottom_padding="$float:componentPadding"   
  
  
          ohos:end_padding="$float:defaultPadding"   
  
  
          ohos:multiple_lines="true"   
  
  
          ohos:text_alignment="vertical_center|left"   
  
  
          ohos:text_size="16vp"   
  
  
          ohos:top_padding="$float:componentPadding"/>

3.item_child_per.xml #分類(lèi)下面的子類(lèi)別

包含了一個(gè)自定義的GridView，我們可以學(xué)習(xí)一下如何自定義組件。

4.item_child_per_grid_per.xml #子類(lèi)別下的網(wǎng)格項(xiàng)組件

比較簡(jiǎn)單

 
 
 
   
  
  
     
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:height="match_content"   
  
  
      ohos:width="60vp"   
  
  
      ohos:alpha="0"   
  
  
      ohos:top_margin="$float:defaultMargin">   
  
  
     
  
  
        
  
  
  
        ohos:height="60vp"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:background_element="$graphic:background_item_grid_per"/>   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:itemChildPerGridPerText"   
  
  
          ohos:height="match_content"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:bottom_padding="$float:componentPadding"   
  
  
          ohos:multiple_lines="true"   
  
  
          ohos:text_alignment="center"   
  
  
          ohos:text_size="16vp"   
  
  
          ohos:top_padding="$float:componentPadding"/>

5.item_grid_per.xml #分類(lèi)下面的網(wǎng)格項(xiàng)

 
 
 
   
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:height="match_content"   
  
  
      ohos:width="108vp"   
  
  
      ohos:background_element="$graphic:background_item_grid_per">   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:itemGridPerImage"   
  
  
          ohos:height="65vp"   
  
  
          ohos:width="match_parent"/>   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:itemGridPerText"   
  
  
          ohos:height="match_content"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:align_parent_start="true"   
  
  
          ohos:align_parent_top="true"   
  
  
          ohos:bottom_padding="$float:componentPadding"   
  
  
          ohos:end_padding="$float:defaultPadding"   
  
  
          ohos:multiple_lines="true"   
  
  
          ohos:start_padding="$float:defaultPadding"   
  
  
          ohos:text_alignment="vertical_center"   
  
  
          ohos:text_size="16vp"   
  
  
          ohos:top_padding="$float:componentPadding"/>

6.search_bar.xml #search組件

 
 
 
   
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:height="match_content"   
  
  
      ohos:width="match_parent"   
  
  
      ohos:background_element="$color:colorSubBackground">   
  
  
     
  
  
        
  
  
  
        ohos:height="match_content"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:background_element="$graphic:background_search_bar"   
  
  
          ohos:bottom_margin="$float:componentPadding"   
  
  
          ohos:end_margin="$float:defaultMargin"   
  
  
          ohos:start_margin="$float:defaultMargin"   
  
  
          ohos:top_margin="$float:componentPadding">   
  
  
     
  
  
            
  
  
  
            ohos:id="$+id:searchImage"   
  
  
              ohos:height="match_content"   
  
  
              ohos:width="match_content"   
  
  
              ohos:image_src="$media:searchIcon"   
  
  
              ohos:start_margin="$float:defaultMargin"   
  
  
              ohos:vertical_center="true"/>   
  
  
     
  
  
            
  
  
  
            ohos:id="$+id:searchTextField"   
  
  
              ohos:height="match_content"   
  
  
              ohos:width="match_parent"   
  
  
              ohos:bottom_padding="$float:componentPadding"   
  
  
              ohos:element_cursor_bubble="#00000000"   
  
  
              ohos:end_of="$id:searchImage"   
  
  
              ohos:end_padding="$float:defaultPadding"   
  
  
              ohos:hint="$string:search"   
  
  
              ohos:multiple_lines="false"   
  
  
              ohos:start_padding="$float:defaultPadding"   
  
  
              ohos:text_alignment="vertical_center"   
  
  
              ohos:text_size="16fp"   
  
  
              ohos:top_padding="$float:componentPadding"   
  
  
              ohos:vertical_center="true"/>

7.tab.xml #單個(gè)tab組件

 
 
 
   
  
  
     
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:id="$+id:tab"   
  
  
      ohos:height="match_content"   
  
  
      ohos:width="0vp"   
  
  
      ohos:alignment="center"   
  
  
      ohos:orientation="vertical"   
  
  
      ohos:weight="1">   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:bottom_tab_button_image"   
  
  
          ohos:height="$float:heightTab"   
  
  
          ohos:width="$float:widthTab"/>   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:bottom_tab_button_text"   
  
  
          ohos:height="match_content"   
  
  
          ohos:width="match_parent"   
  
  
          ohos:text_alignment="top|horizontal_center"   
  
  
          ohos:text_color="$color:colorTabTextNormal"   
  
  
          ohos:text_size="$float:textSizeTab"   
  
  
          ohos:top_margin="2vp"/>

8.title_bar.xml #標(biāo)題組件

兩個(gè)Text 加上一個(gè)Image

 
 
 
   
  
  
     
  
  
    
  
  
  
    xmlns:ohos="http://schemas.huawei.com/res/ohos"   
  
  
      ohos:height="$float:defaultHeight"   
  
  
      ohos:width="match_parent"   
  
  
      ohos:background_element="$color:colorSubBackground">   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:title_text"   
  
  
          ohos:height="match_content"   
  
  
          ohos:width="match_content"   
  
  
          ohos:align_parent_bottom="true"   
  
  
          ohos:bottom_padding="$float:defaultPadding"   
  
  
          ohos:end_padding="$float:defaultPadding"   
  
  
          ohos:multiple_lines="true"   
  
  
          ohos:start_padding="$float:defaultPadding"   
  
  
          ohos:text="$string:entry_MainAbility"   
  
  
          ohos:text_color="$color:appbar_title_color"   
  
  
          ohos:text_size="$float:appbar_title_text_size"/>   
  
  
     
  
  
        
  
  
  
        ohos:id="$+id:describe_text"   
  
  
          ohos:height="match_content"   
  
  
          ohos:width="match_content"   
  
  
          ohos:align_parent_bottom="true"   
  
  
          ohos:bottom_padding="$float:defaultPadding"   
  
  
          ohos:end_of="$id:title_text"   
  
  
          ohos:multiple_lines="true"   
  
  
          ohos:text="$string:describe"   
  
  
          ohos:text_color="$color:appbar_subtitle_color"   
  
  
          ohos:text_size="$float:appbar_text_size"/>   
  
  
     
  
  
        
  
  
  
        ohos:height="match_content"   
  
  
          ohos:width="match_content"   
  
  
          ohos:align_parent_bottom="true"   
  
  
          ohos:align_parent_end="true"   
  
  
          ohos:bottom_padding="$float:defaultPadding"   
  
  
          ohos:end_padding="$float:defaultPadding"   
  
  
          ohos:image_src="$media:addIcon"/>

業(yè)務(wù)邏輯

1.CategoryListProvider

部分關(guān)鍵代碼

 
 
 
   
  
  
  @Override   
  
  
      public Component getComponent(int index, Component component, ComponentContainer componentContainer) {   
  
  
     
  
  
     
  
  
          Component itemComponent = component;   
  
  
          CategoryListViewHolder viewHolder;   
  
  
     
  
  
          //獲取布局組件   
  
  
          if (itemComponent == null) {   
  
  
              itemComponent =   
  
  
                      LayoutScatter.getInstance(context)   
  
  
                              .parse(ResourceTable.Layout_category_list_per, componentContainer, false);   
  
  
          }   
  
  
     
  
  
          //初始化ViewHolder   
  
  
          viewHolder = new CategoryListViewHolder();   
  
  
          viewHolder.text = (Text) itemComponent.findComponentById(ResourceTable.Id_categoryListPerText);   
  
  
          viewHolder.text.setText(getItem(index));   
  
  
     
  
  
          //對(duì)齊方式   
  
  
          if (TextTool.isLayoutRightToLeft(Locale.getDefault())) {   
  
  
              viewHolder.text.setTextAlignment(TextAlignment.VERTICAL_CENTER | TextAlignment.RIGHT);   
  
  
          } else {   
  
  
              viewHolder.text.setTextAlignment(TextAlignment.VERTICAL_CENTER | TextAlignment.LEFT);   
  
  
          }   
  
  
          //獲取color.json中的顏色值，設(shè)置Text組件的顏色   
  
  
          if (selectIndex == index) {   
  
  
              viewHolder.text.setTextColor(new Color(ElementUtil.getColor(context, ResourceTable.Color_primary_color)));   
  
  
          } else {   
  
  
              viewHolder.text.setTextColor(new Color(ElementUtil.getColor(context, ResourceTable.Color_primary_default)));   
  
  
          }   
  
  
     
  
  
          return itemComponent;   
  
  
      }   
  
  
     
  
  
      /**   
  
  
       * 定義視圖持有者   
  
  
       */   
  
  
      private static class CategoryListViewHolder {   
  
  
          Text text;   
  
  
      }

2.ElementUtil

學(xué)習(xí)如何獲取element color.json的顏色值，用java代碼設(shè)置給組件。

 
 
 
   
  
  
  package com.buty.categoryabilityjava.utils;   
  
  
     
  
  
  import ohos.agp.utils.Color;   
  
  
  import ohos.app.Context;   
  
  
  import ohos.global.resource.NotExistException;   
  
  
  import ohos.global.resource.WrongTypeException;   
  
  
     
  
  
  import java.io.IOException;   
  
  
  import java.util.logging.Level;   
  
  
  import java.util.logging.Logger;   
  
  
     
  
  
  /**   
  
  
   * The ElementUtil   
  
  
   */   
  
  
  public class ElementUtil {   
  
  
      /**   
  
  
       * The getColor   
  
  
       *   
  
  
       * @param context    context   
  
  
       * @param resColorId resColorId   
  
  
       * @return color   
  
  
       */   
  
  
      public static int getColor(Context context, int resColorId) {   
  
  
          try {   
  
  
              //   
  
  
              String strColor = context.getResourceManager().getElement(resColorId).getString();   
  
  
     
  
  
              if (strColor.length() == 7) {   
  
  
                  //返回7位顏色值   
  
  
                  return context.getResourceManager().getElement(resColorId).getColor();   
  
  
              } else if (strColor.length() == 9) {   
  
  
                  //返回9位顏色值   
  
  
                  return Color.getIntColor(strColor);   
  
  
              } else {   
  
  
                  return 0x000000;   
  
  
              }   
  
  
          } catch (WrongTypeException | NotExistException | IOException e) {   
  
  
              Logger.getLogger(ElementUtil.class.getName()).log(Level.SEVERE, e.getMessage());   
  
  
          }   
  
  
          return 0x000000;   
  
  
      }   
  
  
  }

3.GridAdapter

 
 
 
   
  
  
  package com.buty.categoryabilityjava.view;   
  
  
     
  
  
  import com.buty.categoryabilityjava.utils.LogUtils;   
  
  
     
  
  
  import ohos.agp.components.Component;   
  
  
  import ohos.agp.components.Image;   
  
  
  import ohos.agp.components.LayoutScatter;   
  
  
  import ohos.agp.components.Text;   
  
  
  import ohos.app.Context;   
  
  
     
  
  
  import java.util.ArrayList;   
  
  
  import java.util.List;   
  
  
  import java.util.Map;   
  
  
  import java.util.stream.IntStream;   
  
  
     
  
  
  /**   
  
  
   * The GridAdapter, adapter of the gridView   
  
  
   */   
  
  
  public class GridAdapter {   
  
  
      private final List componentList = new ArrayList<>();   
  
  
     
  
  
      /**   
  
  
       * The GridAdapter, adapter of the gridView   
  
  
       *   
  
  
       * @param context context   
  
  
       * @param xmlId   xmlId, the xml layout of each item of gridView   
  
  
       * @param data    data, the number of key-value also the number of item   
  
  
       * @param from    from, the collection for the key in de data   
  
  
       * @param to      to, the value from the data to the component target   
  
  
       */   
  
  
      public GridAdapter(Context context, int xmlId, List> data, String[] from, int[] to) {   
  
  
          for (Map datum : data) {   
  
  
              // get component for the xml   
  
  
              Component layoutComponent = LayoutScatter.getInstance(context).parse(xmlId, null, false);   
  
  
     
  
  
              // create each itemComponent for the args：data、from、to   
  
  
              IntStream.range(0, to.length)   
  
  
                      .forEach(   
  
  
                              index -> {   
  
  
                                  Component itemComponent = layoutComponent.findComponentById(to[index]);   
  
  
                                  if (itemComponent instanceof Image) {   
  
  
                                      Image image = (Image) itemComponent;   
  
  
                                      if (datum.get(from[index]) instanceof int[]) {   
  
  
                                          try {   
  
  
                                              image.setPixelMap(((int[]) datum.get(from[index]))[index]);   
  
  
                                          } catch (IndexOutOfBoundsException e) {   
  
  
                                              LogUtils.error("GridAdapter", "IndexOutOfBoundsException");   
  
  
                                          }   
  
  
                                      }   
  
  
                                  } else {   
  
  
                                      if (itemComponent instanceof Text) {   
  
  
                                          Text text = (Text) itemComponent;   
  
  
                                          if (datum.get(from[index]) instanceof String[]) {   
  
  
                                              try {   
  
  
                                                  text.setText(((String[]) datum.get(from[index]))[index]);   
  
  
                                              } catch (IndexOutOfBoundsException e) {   
  
  
                                                  LogUtils.error("GridAdapter", "IndexOutOfBoundsException");   
  
  
                                                  text.setText("null");   
  
  
                                              }   
  
  
                                          } else if (datum.get(from[index]) instanceof int[]) {   
  
  
                                              try {   
  
  
                                                  text.setText(((int[]) datum.get(from[index]))[index]);   
  
  
                                              } catch (IndexOutOfBoundsException e) {   
  
  
                                                  LogUtils.error("GridAdapter", "IndexOutOfBoundsException");   
  
  
                                                  text.setText("null");   
  
  
                                              }   
  
  
                                          } else {   
  
  
                                              text.setText("null");   
  
  
                                          }   
  
  
                                      }   
  
  
                                  }   
  
  
                              });   
  
  
     
  
  
              componentList.add(layoutComponent);   
  
  
          }   
  
  
      }   
  
  
     
  
  
      /**   
  
  
       * The getComponentList   
  
  
       *   
  
  
       * @return componentList   
  
  
       */   
  
  
      List getComponentList() {   
  
  
          return componentList;   
  
  
      }   
  
  
  }

4.GridView

 
 
 
   
  
  
  package com.buty.categoryabilityjava.view;   
  
  
     
  
  
  import ohos.agp.components.AttrSet;   
  
  
  import ohos.agp.components.Component;   
  
  
  import ohos.agp.components.ComponentContainer;   
  
  
  import ohos.agp.components.TableLayout;   
  
  
  import ohos.agp.utils.TextTool;   
  
  
  import ohos.app.Context;   
  
  
     
  
  
  import java.util.Locale;   
  
  
     
  
  
  /**   
  
  
   * The GridView， a custom component like grid   
  
  
   */   
  
  
  public class GridView extends TableLayout implements Component.LayoutRefreshedListener {   
  
  
      private OnItemClickListener onItemClickListener;   
  
  
      private OnRefreshedListener onRefreshedListener;   
  
  
     
  
  
      private GridAdapter adapter;   
  
  
     
  
  
      // custom Attr   
  
  
      private int columnMargin;   
  
  
      private int rowMargin;   
  
  
     
  
  
      //add custom attr   
  
  
      private int rowPadding;   
  
  
     
  
  
      private boolean isOnRefreshed = false;   
  
  
     
  
  
      public GridView(Context context) {   
  
  
          super(contex                                                

                                                文章名稱(chēng)：HarmonyOS官方模板學(xué)習(xí)之Category Ability(Java)                                                

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