adapter适配器（3分钟入手）

最新推荐文章于 2024-09-09 09:49:07 发布

玛丽莲.梦露

最新推荐文章于 2024-09-09 09:49:07 发布

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文章标签： android studio android android-studio

本文链接：https://blog.youkuaiyun.com/Angle_sister/article/details/122097740

版权

本文介绍了一款用于智能城市应用的新闻适配器设计，包括通用适配器SuperBase，具有选中项样式更改功能的SuperBases，带有圆圈指示器的分页适配器SuperPages，以及具体的新闻适配器NewsAdapter和LiveNewsAdapter。这些组件共同实现了不同类型的新闻列表展示，并支持交互功能。

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SuperBase

package com.example.smartcity.adpter;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class SuperBase extends BaseAdapter {
    public SuperBase(int mList) {
        this.mList = mList;
    }

    private int mList;


    @Override
    public int getCount() {
        return mList;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public abstract View getView(int position, View convertView, ViewGroup parent);

}

SuperBases（选中item更换样式）

package com.example.smartcity.adpter;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class SuperBases extends BaseAdapter {
    public SuperBases(int mList) {
        this.mList = mList;
    }

    private int mList;


    @Override
    public int getCount() {
        return mList;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public abstract View getView(int position, View convertView, ViewGroup parent);

    public abstract void setSelectItem(int position);
}

SuperPage

package com.example.smartcity.adpter;

import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

public abstract class SuperPage extends PagerAdapter {
    private int mList;

    public SuperPage(int mList) {
        this.mList = mList;
    }

    @Override
    public int getCount() {
        return mList;
    }

    @NonNull
    @Override
    public abstract Object instantiateItem(@NonNull ViewGroup container, int position);

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }
}

SuperPages（有圆圈标识）

package com.example.smartcity.adpter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import com.example.smartcity.R;

public abstract class SuperPages extends PagerAdapter {

    private int mList;
    private RadioGroup mCircle;
    private Context context;

    public SuperPages(int mList, RadioGroup radioGroup, Context context) {
        this.mList = mList;
        this.mCircle = radioGroup;
        this.context = context;
        setCircle();//设置圆圈标识
    }

    public void setCircle(){
        for (int i = 0; i < mList; i++) {
            RadioButton radioButton = new RadioButton(context);
            radioButton.setButtonDrawable(R.drawable.circle_select);
            radioButton.setId(i);
            mCircle.addView(radioButton);
        }
    }

    @Override
    public int getCount() {
        return mList;
    }

    @NonNull
    @Override
    public abstract Object instantiateItem(@NonNull ViewGroup container, int position);

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }
}

NewsAdapter

package com.example.smartcity.adpter;

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import com.example.smartcity.R;
import com.example.smartcity.activity.main.NewsInfoActivity;
import com.example.smartcity.bean.NewsInfoSkip;
import com.example.smartcity.info.NewsInfo;
import com.example.smartcity.info.NewsType;
import com.example.smartcity.utils.GetNetImage;
import com.example.smartcity.utils.KeyUtils;

import java.util.ArrayList;
import java.util.List;

import static com.example.smartcity.utils.KeyUtils.NEWS;

public class NewsAdapter extends PagerAdapter {
    private Context context;
    private List<NewsType.DataDTO> mTabs;
    private List<NewsInfo.RowsDTO> mNewsInfo;

    public NewsAdapter(Context context, List<NewsType.DataDTO> mTabs, List<NewsInfo.RowsDTO> mNewsInfo) {
        this.context = context;
        this.mTabs = mTabs;
        this.mNewsInfo = mNewsInfo;
    }

    //获取选项卡表头
    public CharSequence getPageTitle(int position){
        return mTabs.get(position).getName();
    }


    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        ListView listView = new ListView(context);
        setListView(listView,position);
        container.addView(listView);
        return listView;
    }
    
    //设置listView
    public void setListView(ListView listView,int position){
        //分类数据
        ArrayList<NewsInfo.RowsDTO> newsInfos = new ArrayList<>();
        for (int i = 0; i < mNewsInfo.size(); i++) {
            if (mNewsInfo.get(i).getType().equals(mTabs.get(position).getId()+"")){
                newsInfos.add(mNewsInfo.get(i));
            }
        }

        //设置适配器
        SuperBase superBase = new SuperBase(newsInfos.size()) {
            private ImageView mNewsImg;
            private TextView mNewsTitle;
            private TextView mNewsContent;
            private TextView mNewsMsg;
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                convertView = LayoutInflater.from(context).inflate(R.layout.item_news,parent,false);
                mNewsImg = (ImageView) convertView.findViewById(R.id.news_img);
                mNewsTitle = (TextView) convertView.findViewById(R.id.news_title);
                mNewsContent = (TextView) convertView.findViewById(R.id.news_content);
                mNewsMsg = (TextView) convertView.findViewById(R.id.news_msg);

                new GetNetImage(context,newsInfos.get(position).getCover(),mNewsImg);
                mNewsTitle.setText(newsInfos.get(position).getTitle());
                mNewsContent.setText(newsInfos.get(position).getContent());
                String msg = "评论总数:"+newsInfos.get(position).getCommentNum()+"\t\t发布时间:"+newsInfos.get(position).getPublishDate();
                mNewsMsg.setText(msg);
                return convertView;
            }
        };
        listView.setAdapter(superBase);
        //listView条目点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                NewsInfoSkip newsInfoSkip = new NewsInfoSkip();

                NewsInfo.RowsDTO rowsDTO = newsInfos.get(position);
                newsInfoSkip.setImage(rowsDTO.getCover());
                newsInfoSkip.setTitle(rowsDTO.getTitle());
                newsInfoSkip.setContent(rowsDTO.getContent());
                Intent intent = new Intent(context, NewsInfoActivity.class);
                intent.putExtra(NEWS,newsInfoSkip);
                context.startActivity(intent);
            }
        });
    }


    @Override
    public int getCount() {
        return mTabs.size();
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }
}

LiveNewsAdapter（生活新闻）

package com.example.smartcity.adpter;

import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import com.example.smartcity.R;
import com.example.smartcity.activity.main.NewsInfoActivity;
import com.example.smartcity.bean.NewsInfoSkip;
import com.example.smartcity.info.NewsInfo;
import com.example.smartcity.info.NewsType;
import com.example.smartcity.info.life.LiveNews;
import com.example.smartcity.info.life.LiveNewsType;
import com.example.smartcity.utils.GetNetImage;

import java.util.ArrayList;
import java.util.List;

import static com.example.smartcity.utils.KeyUtils.NEWS;

public class LiveNewsAdapter extends PagerAdapter {
    private Context context;
    private List<LiveNewsType.DataDTO> mTabs;
    private List<LiveNews.RowsDTO> mNewsInfo;

    public LiveNewsAdapter(Context context, List<LiveNewsType.DataDTO> mTabs, List<LiveNews.RowsDTO> mNewsInfo) {
        this.context = context;
        this.mTabs = mTabs;
        this.mNewsInfo = mNewsInfo;
    }

    //获取选项卡表头
    public CharSequence getPageTitle(int position){
        return mTabs.get(position).getName();
    }


    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        ListView listView = new ListView(context);
        setListView(listView,position);
        container.addView(listView);
        return listView;
    }
    
    //设置listView
    public void setListView(ListView listView,int position){
        //分类数据
        ArrayList<LiveNews.RowsDTO> newsInfos = new ArrayList<>();
        for (int i = 0; i < mNewsInfo.size(); i++) {
            if (mNewsInfo.get(i).getType().equals(mTabs.get(position).getId()+"")){
                newsInfos.add(mNewsInfo.get(i));
            }
        }

        //设置适配器
        SuperBase superBase = new SuperBase(newsInfos.size()) {
            private ImageView mNewsImg;
            private TextView mNewsTitle;
            private TextView mNewsContent;
            private TextView mNewsMsg;
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                convertView = LayoutInflater.from(context).inflate(R.layout.item_news,parent,false);
                mNewsImg = (ImageView) convertView.findViewById(R.id.news_img);
                mNewsTitle = (TextView) convertView.findViewById(R.id.news_title);
                mNewsContent = (TextView) convertView.findViewById(R.id.news_content);
                mNewsMsg = (TextView) convertView.findViewById(R.id.news_msg);

                new GetNetImage(context,newsInfos.get(position).getCover(),mNewsImg);
                mNewsTitle.setText(newsInfos.get(position).getTitle());
                mNewsContent.setText(newsInfos.get(position).getContent());
                String msg = "评论总数:"+newsInfos.get(position).getCommentNum()+"\t\t发布时间:"+newsInfos.get(position).getPublishDate();
                mNewsMsg.setText(msg);
                return convertView;
            }
        };
        listView.setAdapter(superBase);
        //listView条目点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                NewsInfoSkip newsInfoSkip = new NewsInfoSkip();

                LiveNews.RowsDTO rowsDTO = newsInfos.get(position);
                newsInfoSkip.setImage(rowsDTO.getCover());
                newsInfoSkip.setTitle(rowsDTO.getTitle());
                newsInfoSkip.setContent(rowsDTO.getContent());
                Intent intent = new Intent(context, NewsInfoActivity.class);
                intent.putExtra(NEWS,newsInfoSkip);
                context.startActivity(intent);
            }
        });
    }


    @Override
    public int getCount() {
        return mTabs.size();
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }
}