新闻客户端

1. 内容摘要

• Gson解析json数据，不熟悉Gson解析的同学，请看使用Gson解析json数据

• SmartImageView的使用– https://github.com/loopj/android-smart-image-view
  

• android轻量级网络请求框架MyHttputils http://blog.csdn.net/qq137722697

2.新闻数据

[  {    "icon": "http://10.51.10.182:8080/images/a.jpg",    "title": "科技温暖世界",    "content": "进入一个更有爱的领域",    "type": "1",    "comment": "69"  },  {    "icon": "http://10.51.10.182:8080/images/b.jpg",    "title": "《神武》",    "content": "新美术资源盘点，视觉新体验",    "type": "2",    "comment": "35"  },  {    "icon": "http://10.51.10.182:8080/images/c.jpg",    "title": "南北车正式公布合并",    "content": "南北车将于今日正式公布合并",    "type": "3",    "comment": "2"  },  {    "icon": "http://10.51.10.182:8080/images/d.jpg",    "title": "萌呆了！汪星人抱玩偶酣睡",    "content": "汪星人抱玩偶酣睡，萌翻网友",    "type": "1",    "comment": "25"  },  {    "icon": "http://10.51.10.182:8080/images/e.jpg",    "title": "风力发电进校园",    "content": "风力发电普进校园",    "type": "2",    "comment": "26"  },  {    "icon": "http://10.51.10.182:8080/images/f.jpg",    "title": "地球一小时",    "content": "地球熄灯一小时",    "type": "1",    "comment": "23"  },  {    "icon": "http://10.51.10.182:8080/images/g.jpg",    "title": "最美公路",    "content": "最美公路，难以想象",    "type": "1",    "comment": "23"  }]

对应实体代码

public class NewInfo {    private String  iconPath;    private String title;    private String description;    private int type ;    private long comment;    public String getIconPath() {        return iconPath;    }    public void setIconPath(String iconPath) {        this.iconPath = iconPath;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public long getComment() {        return comment;    }    public void setComment(long comment) {        this.comment = comment;    }}

3.布局文件

main

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity"    android:orientation="vertical">    <FrameLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <LinearLayout            android:id="@+id/loading"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:gravity="center"            android:orientation="vertical"            android:visibility="invisible">            <ProgressBar                android:layout_width="wrap_content"                android:layout_height="wrap_content" />            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="正在加载信息..." />        </LinearLayout>        <ListView            android:id="@+id/lv_news"            android:layout_width="match_parent"            android:layout_height="match_parent" />    </FrameLayout></LinearLayout>

news

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="65dp">    <com.loopj.android.image.SmartImageView        android:id="@+id/siv_icon"        android:layout_width="80dp"        android:layout_height="60dp"        android:scaleType="centerCrop"        android:src="@mipmap/ic_launcher"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"></com.loopj.android.image.SmartImageView>    <TextView        android:id="@+id/tv_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="5dp"        android:layout_marginTop="10dp"        android:layout_toRightOf="@id/siv_icon"        android:ellipsize="end"        android:maxLength="20"        android:singleLine="true"        android:text="我是标题"        android:textColor="#000000"        android:textSize="18sp" />    <TextView        android:id="@+id/tv_description"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/tv_title"        android:layout_marginLeft="5dp"        android:layout_marginTop="5dp"        android:layout_toRightOf="@id/siv_icon"        android:ellipsize="end"        android:maxLength="16"        android:maxLines="1"        android:text="我是描述"        android:textColor="#99000000"        android:textSize="14sp" />    <TextView        android:id="@+id/tv_type"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:layout_marginBottom="5dp"        android:layout_marginRight="10dp"        android:text="评论"        android:textColor="#99000000"        android:textSize="12sp" /></RelativeLayout>

4.代码实现

public class MainActivity extends Activity {    private ListView lv_nenw;    private LinearLayout loading;    private List<NewInfo> newInfos;    private class NewsAdapter extends BaseAdapter {        public int getCount() {            return newInfos.size();        }        @Override        public Object getItem(int i) {            return null;        }        @Override        public long getItemId(int i) {                return 0;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            View view1 = View.inflate(MainActivity.this, R.layout.news_item, null);            SmartImageView siv = (SmartImageView) view1.findViewById(R.id.siv_icon);            TextView tv_title = (TextView) view1.findViewById(R.id.tv_title);            TextView tv_description = (TextView) view1.findViewById(R.id.tv_description);            TextView tv_type = (TextView) view1.findViewById(R.id.tv_type);            NewInfo newInfo = newInfos.get(i);            siv.setImageUrl(newInfo.getIconPath(), R.drawable.a, R.drawable.b);            tv_title.setText(newInfo.getTitle());            tv_description.setText(newInfo.getDescription());            int type = newInfo.getType();            switch (type) {                case 1:                    tv_type.setText("评论：" + newInfo.getComment());                    break;                case 2:                    tv_type.setTextColor(Color.RED);                    tv_type.setText("专题");                    break;                case 3:                    tv_type.setTextColor(Color.BLUE);                    tv_type.setText("LIVE");                    break;            }            return view1;        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv_nenw= (ListView) findViewById(R.id.lv_news);        loading= (LinearLayout) findViewById(R.id.loading);        filldata2();    }    private void filldata2() {        MyHttpUtils.build()//构建myhttputils                .url("http://10.51.10.182:8080/NewsInfo.json")//请求的url                .onExecute(new StringCallBack() {//开始执行，并有一个回调（异步的哦---->直接可以更新ui）                    @Override                    public void onSucceed(String result) {//请求成功之后会调用这个方法                        //成功之后的拿到结果result进行处理                        newInfos=JsonParse.getNewsInfo(result);                        if (newInfos==null){                            Toast.makeText(MainActivity.this,"解析失败",Toast.LENGTH_SHORT).show();                        }else {                            loading.setVisibility(View.INVISIBLE);;                            lv_nenw.setAdapter(new NewsAdapter());                        }                    }                    @Override                    public void onFailed(Throwable throwable) {//请求失败的时候会调用这个方法                        //失败之后的拿到错误结果throwable进行处理                        Toast.makeText(MainActivity.this,"请求失败",Toast.LENGTH_LONG).show();                    }                });    }    /*private void filldata2(){        AsyncHttpClient asyncHttpClient=new AsyncHttpClient();        asyncHttpClient.get("http//gyq-pc:8080/NewsInfo.json", new AsyncHttpResponseHandler() {            @Override            public void onSuccess(int i, Header[] headers, byte[] bytes) {                try {                    String json=new String (bytes,"utf-8");                    newInfos=JsonParse.getNewsInfo(json);                    if (newInfos==null){                        Toast.makeText(MainActivity.this,"解析失败",Toast.LENGTH_SHORT).show();                    }else {                        loading.setVisibility(View.INVISIBLE);;                        lv_nenw.setAdapter(new NewsAdapter());                    }                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            @Override            public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {                Toast.makeText(MainActivity.this,"请求失败",Toast.LENGTH_LONG).show();            }        });    }*/}

JsonParse实现

public class JsonParse {    public static List<NewInfo> getNewsInfo(String json){        Gson gson =new Gson();        Type listType=new TypeToken<List<NewInfo>>(){} .getType();        List<NewInfo> newinfos=gson.fromJson(json,listType);        return newinfos;    }}

具体实现过程如上

在实现过程中会遇到导入json包，tomcat配置服务器等问题

过程需要添加网络请求权限

<uses-permission android:name="android.permission.INTERNET" />

倒包过程如下