Android实例练习

来源：互联网发布：3d 打印淘宝编辑：程序博客网时间：2024/05/03 20:29

1.MainActivity.java

import java.util.ArrayList;
import com.wangnan.todaytopic.adapter.TodayNewsAdapter;
import com.wangnan.todaytopic.entity.ChannelItem;
import com.wangnan.todaytopic.entity.TodayData;
import com.wangnan.todaytopic.entity.TodayNews;
import com.wangnan.todaytopic.tools.ViewDisplayTool;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.HorizontalScrollView;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.LayoutParams;

public class MainActivity extends FragmentActivity implements OnClickListener{

   private ListView listView;
   private ArrayList<TodayNews> todayData = new ArrayList<TodayNews>();

   private RadioGroup radiogroup;
   private HorizontalScrollView scollview;
   private ArrayList<ChannelItem> defaultChannels;
   private LayoutInflater inflater;
   private DisplayMetrics dm;
   private ViewPager viewPager;
   private ArrayList<Integer> images;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main_layout);
       //listView=(ListView)findViewById(R.id.mylist);
       listView=(ListView)findViewById(R.id.listview);

       radiogroup =(RadioGroup)findViewById(R.id.topcategoryscroll_news_item);
       initChannelData();
       initTab();
       //取得scollview的值，然后在滚动条自定义滚动时使用
       scollview=(HorizontalScrollView)findViewById(R.id.topcategoryscroll);
       //获取viewPager
       viewPager= (ViewPager)findViewById(R.id.view_pager);


       TodayData data = new TodayData();
       data.initData(todayData);
       TodayNewsAdapter adapter = new TodayNewsAdapter(this,todayData );
       listView.setAdapter(adapter);
       /*initTodayData();
       TodayNewsAdapter adapter = new TodayNewsAdapter(this,todayData );
       listView.setAdapter(adapter);*/

       findViewById(R.id.top_head).setOnClickListener(this);

   }

   @Override
   public void onClick(View v) {
       switch (v.getId()) {
       case R.id.top_head:
           Intent intent = new Intent(this,FragmentActivity.class);
           startActivity(intent);
           break;
       default:
           break;
       }
   }


   private void initTab(){
       //获取频宽，然后一次显示5个(方法一)
       /*dm =new DisplayMetrics();
       getWindowManager().getDefaultDisplay().getMetrics(dm);
       int screen=dm.widthPixels/5;*/
       //方法二调用工具类中的方法
       int screen =ViewDisplayTool.getWidth(this)/5;
       //得到选取的值的总数
       int len=defaultChannels.size();
       //在本layout中获取资源，把xml文件中的东西转换出来，更好取
       inflater=LayoutInflater.from(this);
       for(int i=0;i<len;i++){
           ChannelItem item=defaultChannels.get(i);
           RadioButton rb=(RadioButton)inflater.inflate(R.layout.channel_radio_btn, null);
           //使用索引做id号
           rb.setId(i);
           rb.setText(item.getChannelName());
           //把数据放在控件里，从中选取数据
           rb.setTag(item);
           if(item.isChecked()){
               rb.setChecked(true);
           }
           //布局参数，指对应的layout文件的属性
           LayoutParams params=new LayoutParams(screen,LayoutParams.WRAP_CONTENT);
           params.leftMargin=5;
           params.rightMargin=5;
           rb.setPadding(5, 5, 5, 5);
           radiogroup.addView(rb,i,params);
       }
   }

   //自定义类型栏目
   private void initChannelData(){
       defaultChannels= new ArrayList<ChannelItem>();
       defaultChannels.add(new ChannelItem(1,"推荐",1,1,true));
       defaultChannels.add(new ChannelItem(2,"娱乐",2,1,false));
       defaultChannels.add(new ChannelItem(3,"科技",3,1,false));
       defaultChannels.add(new ChannelItem(4,"时尚",4,1,false));
       defaultChannels.add(new ChannelItem(5,"搞笑",5,1,false));
       defaultChannels.add(new ChannelItem(6,"汽车",6,1,false));
       defaultChannels.add(new ChannelItem(7,"文化",7,1,false));
       defaultChannels.add(new ChannelItem(8,"段子",8,1,false));
       defaultChannels.add(new ChannelItem(9,"正能量",9,1,false));
       defaultChannels.add(new ChannelItem(10,"休闲",10,1,false));
   }

}

2   TodayAdapter.java的写法。（未涉及数据库知识）

import java.util.ArrayList;

import com.wangnan.todaytopic.R;
import com.wangnan.todaytopic.entity.TodayNews;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class TodayNewsAdapter extends BaseAdapter {

   private ArrayList<TodayNews> mlist;
   private Context mcontex;
   public TodayNewsAdapter(Context context, ArrayList<TodayNews> mlist) {
       super();
       this.mlist = mlist;
       this.mcontex=context;
   }

   @Override
   public int getCount() {
       return this.mlist==null?0:this.mlist.size();
   }

   @Override
   public TodayNews getItem(int position) {
       return this.mlist.get(position);
   }

   @Override
   public long getItemId(int arg0) {
       return arg0;
   }

   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
       ViewHolder holder =null;
       if(convertView==null){
           LayoutInflater inflater =LayoutInflater.from(this.mcontex);
           convertView = inflater.inflate(R.layout.list_item, null);
           holder = new ViewHolder();
           holder.right_image=(ImageView)convertView.findViewById(R.id.right_image);
           //holder.ic_video=(ImageView)convertView.findViewById(R.id.ic_video);
           holder.item_title=(TextView)convertView.findViewById(R.id.item_title);
           holder.item_source=(TextView)convertView.findViewById(R.id.item_source);
           holder.list_item_local=(TextView)convertView.findViewById(R.id.list_item_local);
           holder.comment_count=(TextView)convertView.findViewById(R.id.comment_count);
           holder.publish_time=(TextView)convertView.findViewById(R.id.publish_time);
           //holder.popicon=(ImageView)convertView.findViewById(R.id.popicon);
           //holder.item_abstract=(TextView)convertView.findViewById(R.id.item_abstract);
           holder.item_image_0=(ImageView)convertView.findViewById(R.id.item_image_0);
           holder.item_image_1=(ImageView)convertView.findViewById(R.id.item_image_1);
           holder.item_image_2=(ImageView)convertView.findViewById(R.id.item_image_2);
           holder.large_image=(ImageView)convertView.findViewById(R.id.large_image);
           holder.alt_mark=(ImageView)convertView.findViewById(R.id.alt_mark);
           //holder.comment_content=(TextView)convertView.findViewById(R.id.comment_content);
           //holder.comment_arrow=(ImageView)convertView.findViewById(R.id.comment_arrow);
           //holder.list_item_favorite_delete=(TextView)convertView.findViewById(R.id.list_item_favorite_delete);
           convertView.setTag(holder);
       }else{
           holder =(ViewHolder)convertView.getTag();
       }
       final TodayNews todaynews=this.mlist.get(position);
       holder.item_title.setText(todaynews.getTilte());
       holder.item_source.setText(todaynews.getSource());
       //holder.list_item_local.setText();
       holder.comment_count.setText("评论"+todaynews.getCommentCount());
       holder.publish_time.setText(todaynews.getPubDateTime());
       //holder.item_abstract.setText();
       //holder.comment_content.setText();
       //holder.list_item_favorite_delete.setText();

       ArrayList<Integer> images=todaynews.getImages();
       if(images!=null && images.size()!=0){
           if(images.size()==1){
               if(todaynews.isLarge()){
                   holder.large_image.setVisibility(View.VISIBLE);
                   holder.large_image.setImageResource(images.get(0));
                   holder.right_image.setVisibility(View.GONE);
                   holder.item_image_0.setVisibility(View.GONE);
                   holder.item_image_1.setVisibility(View.GONE);
                   holder.item_image_2.setVisibility(View.GONE);
               }else{
                   holder.right_image.setVisibility(View.VISIBLE);
                   holder.right_image.setImageResource(images.get(0));
                   holder.large_image.setVisibility(View.GONE);
                   holder.item_image_0.setVisibility(View.GONE);
                   holder.item_image_1.setVisibility(View.GONE);
                   holder.item_image_2.setVisibility(View.GONE);
               }
           }else{
               holder.right_image.setVisibility(View.GONE);
               holder.large_image.setVisibility(View.GONE);
               holder.item_image_0.setImageResource(images.get(0));
               holder.item_image_1.setImageResource(images.get(1));
               holder.item_image_2.setImageResource(images.get(2));
           }
       }else{
           //只有标题
           holder.right_image.setVisibility(View.GONE);
           holder.large_image.setVisibility(View.GONE);
           holder.item_image_0.setVisibility(View.GONE);
           holder.item_image_1.setVisibility(View.GONE);
           holder.item_image_2.setVisibility(View.GONE);
       }
       if(todaynews.getSpecialTag()!=null){
           holder.list_item_local.setVisibility(View.VISIBLE);
           holder.list_item_local.setText(todaynews.getSpecialTag());
       }else{
           holder.list_item_local.setVisibility(View.GONE);
       }
       if(todaynews.getMark()!=-1){
           if(todaynews.getMark()==0){
               holder.alt_mark.setVisibility(View.VISIBLE);
               holder.alt_mark.setImageResource(R.drawable.ic_mark_exclusive);
           }else if(todaynews.getMark()==1){
               holder.alt_mark.setVisibility(View.VISIBLE);
               holder.alt_mark.setImageResource(R.drawable.ic_mark_favor);
           }else if(todaynews.getMark()==2){
               holder.alt_mark.setVisibility(View.VISIBLE);
               holder.alt_mark.setImageResource(R.drawable.ic_mark_first);
           }else if(todaynews.getMark()==3){
               holder.alt_mark.setVisibility(View.VISIBLE);
               holder.alt_mark.setImageResource(R.drawable.ic_mark_hot);
           }else if(todaynews.getMark()==4){
               holder.alt_mark.setVisibility(View.VISIBLE);
               holder.alt_mark.setImageResource(R.drawable.ic_mark_recommend);
           }
       }
       return convertView;
   }


   public static class ViewHolder {
       // 右边图片
       ImageView right_image;
       ImageView ic_video;
       // 文章标题
       TextView item_title;
       // 来源
       TextView item_source;
       // 推广之类的标签
       TextView list_item_local;
       // 评论数量
       TextView comment_count;
       // 发布时间
       TextView publish_time;
       //pop按钮
       ImageView popicon;
       // 新闻摘要
       TextView item_abstract;
       // 3张图片时候的布局
       LinearLayout item_image_layout;
       ImageView item_image_0;
       ImageView item_image_1;
       ImageView item_image_2;
       //大图
       ImageView large_image;
       // 右上方TAG标记图片
       ImageView alt_mark;
       TextView comment_content;
       ImageView comment_arrow;
       TextView list_item_favorite_delete;

   }
}

3 TodayData.java

import java.util.ArrayList;

import com.wangnan.todaytopic.R;

public class TodayData {

   private ArrayList<Integer> images;
   private ArrayList<TodayNews> todayData = new ArrayList<TodayNews>();

   public void initData(ArrayList<TodayNews> todayData){
       //不显示图片的，仅仅是标题
               TodayNews today = new TodayNews();
               today.setTilte("中泰暂停“大米换高铁”计划   寻找其他方案");
               today.setSource("当代商报网");
               today.setCommentCount(516);
               today.setPubDateTime("21分钟前");
               today.setMark(0);
               today.setSpecialTag("头条");
               todayData.add(today);

               //有标题和右边图片的
               today= new TodayNews();
               images=new ArrayList<Integer>();
               today.setTilte("巫启贤不玩不玩冰桶改验毒点名吸毒女星同门");
               images.add(R.drawable.ic_launcher);
               today.setImages(images);
               today.setSource("中时电子报");
               today.setCommentCount(186);
               today.setPubDateTime("08-29 21:09");
               today.setSpecialTag("推荐");
               today.setMark(3);
               todayData.add(today);

               //显示标题及三张图片
               today= new TodayNews();
               images=new ArrayList<Integer>();
               today.setTilte("蒸面条的做法大全");
               today.setSource("豆果美食");
               today.setCommentCount(15);
               today.setPubDateTime("08-12 01:12");
               images.add(R.drawable.grossini_dance_04);
               images.add(R.drawable.grossini_dance_06);
               images.add(R.drawable.grossini_dance_08);
               today.setImages(images);
               today.setMark(4);
               todayData.add(today);

               //显示标题和大图片,有特殊标签
               today= new TodayNews();
               images=new ArrayList<Integer>();
               today.setTilte("《家有儿女》刘星死党键盘逆袭！");
               today.setSource("87网络IT男");
               //today.setSpecialTag();
               today.setCommentCount(1031);
               today.setPubDateTime("4小时前");
               today.setLarge(true);
               images.add(R.drawable.ic_launcher);
               today.setImages(images);
               todayData.add(today);

               today= new TodayNews();
               images=new ArrayList<Integer>();
               today.setTilte("华为中国区总裁朱平：海思处理器不是标配");
               today.setSource("手机凤凰网");
               today.setCommentCount(1031);
               today.setPubDateTime("07-23");
               today.setSpecialTag("热门");
               today.setMark(2);
               today.setLarge(true);
               images.add(R.drawable.logo);
               today.setImages(images);
               todayData.add(today);

               today= new TodayNews();
               images=new ArrayList<Integer>();
               today.setTilte("吴镇宇领衔，靠人格魅力走红的10大明星");
               today.setSource("头条专题");
               //today.setSpecialTag();
               today.setCommentCount(3231);
               today.setPubDateTime("05-11");
               today.setMark(1);
               today.setLarge(false);
               images.add(R.drawable.grossini_dance_07);
               today.setImages(images);
               todayData.add(today);

           }
}

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