AsynHttpClient和SmartImageView控件的使用

来源：互联网发布：卖客疯之类的软件编辑：程序博客网时间：2024/06/07 22:58

我们用AsynHttpClient和SmartImageView控件来做一个新闻发布系统。

首现，我们看一下运行效果图：
这里写图片描述

中间我们有几点需要注意：、
1、运行前一定要开启Tomcat服务器，在Tomcat服务器根目录下找到bin文件夹，找到 startup.bat,点击运行开启服务器。
2、我们期间，要用到json解析，要在android studio中添加json包，以下是添加json包的过程：
这里写图片描述

主布局：

<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>

布局中运用到了ListView：

<?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>

接下来是json的类：

public class NewsInfo {    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;    }}

import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import java.lang.reflect.Type;import java.util.List;import cn.edu.bzu.mynews.entity.NewsInfo;/** * Created by lm on 2017/5/18. */public class JsonParse {    public static List<NewsInfo> getNewInfo(String json){        Gson gson=new Gson();        Type listType=new TypeToken<List<NewsInfo>>(){        }.getType();        List<NewsInfo> newsInfos=gson.fromJson(json,listType);       return newsInfos;    }}

下面是主要的页面交互界面：

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.Toast;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.AsyncHttpResponseHandler;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import cn.edu.bzu.mynews.Tools.JsonParse;import cn.edu.bzu.mynews.adapter.NewAdapter;import cn.edu.bzu.mynews.entity.NewsInfo;import cn.edu.bzu.mynews.model.Fruit;public class MainActivity extends AppCompatActivity {    private ListView Iv_news;    private NewAdapter newAdapter;    private List<NewsInfo> newInfos;    private LinearLayout loading;    private JsonParse jsonParse;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Iv_news= (ListView) findViewById(R.id.lv_news);        newAdapter =new NewAdapter(this,R.layout.news_item,newInfos);        loading= (LinearLayout) findViewById(R.id.loading);        prepareData();    }    private void prepareData() {        AsyncHttpClient asyncHttpClient=new AsyncHttpClient();        asyncHttpClient.get(getString(R.string.serverurl), new AsyncHttpResponseHandler() {            @Override            public void onSuccess(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes) {                try {                    String json=new String(bytes,"utf-8");                    newInfos=jsonParse.getNewInfo(json);                    if(newInfos==null){                        Toast.makeText(MainActivity.this,"解析失败",Toast.LENGTH_SHORT).show();                    }                    else {                        loading.setVisibility(View.INVISIBLE);                        Iv_news.setAdapter(newAdapter);                    }                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            @Override            public void onFailure(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes, Throwable throwable) {                Toast.makeText(MainActivity.this,"请求失败",Toast.LENGTH_SHORT).show();            }        });    }}

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