新闻客户端News

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AsyncHttpClient 和 SmartImageView 的使用

运行界面

这里写图片描述

界面交互代码

MainActivity

ListView 的 setOnItemClickListener() 方法

 用于监听Item的点击事件 使用时 需要传入一个OnItemClickListener 实现类对象 且需要实现onItemClick() 方法

ListView 的 setSelection() 方法

 设置当前选中的条目

public class MainActivity extends AppCompatActivity {    ListView lv_news;    LinearLayout Loading;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv_news = (ListView) findViewById(R.id.lv_news);        Loading = (LinearLayout) findViewById(R.id.loading);        fillData3();    }    private void fillData3() {        System.out.println(">>>>>>>>>>>>>执行了");        AsyncHttpClient asynchttpClient = new AsyncHttpClient();        asynchttpClient.get("http://10.61.19.112:8080/NewsInfo.json", new AsyncHttpResponseHandler() {            @Override            public void onSuccess(int i, org.apache.http.Header[] headers, byte[] bytes) {                try {                    String json = new String(bytes, "utf-8");                    List<newsInfo> newsInfos = JsonParse.getNewsInfo(json);                    if (newsInfos == null) {                        Toast.makeText(MainActivity.this, "解析失败！", Toast.LENGTH_SHORT).show();                    } else {                        Toast.makeText(MainActivity.this, "获取成功！", Toast.LENGTH_SHORT).show();                        Loading.setVisibility(View.INVISIBLE);                        lv_news.setAdapter(new newsAdapter(MainActivity.this, newsInfos));                    }                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            @Override            public void onFailure(int i, org.apache.http.Header[] headers, byte[] bytes, Throwable throwable) {                System.out.println(">>>>>>>>>获取失败！");            }        });    }}

newsInfo类

定义了 IconPath 图片路径新闻标题描述等等描述

public class newsInfo {    private String icon;    private String title;    private String content;    private int type;    private long comment;    public String getIcon() {        return icon;    }    public void setIcon(String icon) {        this.icon = icon;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getContent() {        return content;    }    public void setContent(String content) {        this.content = content;    }    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;    }}

JsonParse类

android

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

newsAdapter类

androidpublic class newsAdapter extends ArrayAdapter<newsInfo>{    public newsAdapter(Context context,  List<newsInfo> objects) {        super(context, R.layout.news_item , objects);    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        newsInfo news= getItem(position);        View view;        ViewHolder viewHolder;        if (convertView == null) {            //任务 补充完整            view = LayoutInflater.from(getContext()).inflate(R.layout.news_item, null);            viewHolder = new ViewHolder();            //获取控件            viewHolder.siv = (SmartImageView) view.findViewById(R.id.siv_icon);            viewHolder.tvtitle = (TextView) view.findViewById(R.id.tv_title);            viewHolder.tvdescription = (TextView) view.findViewById(R.id.tv_description);            viewHolder.tvtype = (TextView) view.findViewById(R.id.tv_type);            view.setTag(viewHolder);        } else {            view = convertView;            viewHolder = (ViewHolder) view.getTag();        }        viewHolder.siv.setImageUrl(news.getIcon());        viewHolder.tvtitle.setText(news.getTitle());        viewHolder.tvdescription.setText(news.getContent());        viewHolder.tvtype.setText(news.getType()+"");        return view;    }    class ViewHolder {        SmartImageView siv;        TextView tvtitle;        TextView tvdescription;        TextView tvtype;    }}

布局文件

Activity_main.xml

android<?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_item.xml

TextView用于显示数据库中的某条数据的详细信息
ImageView用于增加减少金额和删除金额

android<?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>

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