Android模擬實現網易新聞客戶端

Android模擬實現網易新聞客戶端
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首先我們先看一下要模擬的介面

我們主要實現的就是ListView解析json檔案中的資料,UI佈局很簡單不做贅述。
這裡我們需要一個伺服器來實現資料的動態更新, 這裡我們用到的是Tomcat8.0。
首先我們把需要解析的json檔案放置到Tomcat的webapp檔案下的ROOT裡面,方便我們解析。

首先我們建立一個JsonParse類用來解析json檔案:


package cn.edu.bzu.myapplication.Tools;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.List;
import cn.edu.bzu.myapplication.entity.NewsInfo;
/**
* Created by Becauseshy 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;
}
}

建立json檔案的實體類:


package cn.edu.bzu.myapplication.entity;
/**
* Created by Becauseshy on 2017/5/17.
*/
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;
}
}

activity_main.xml:


<?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="正在載入資訊..." />
</LinearLayout>
<ListView
android:id="@ id/lv_news"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
</LinearLayout>

item的佈局檔案:


<?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="我是標題"
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="評論"
android:textColor="#99000000"
android:textSize="12sp" />
</RelativeLayout>

介面卡程式碼:


package cn.edu.bzu.myapplication.adapter;
/**
* Created by Becauseshy on 2017/5/17.
*/
import android.content.Context;
import android.graphics.Color;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.loopj.android.image.SmartImageView;
import java.util.List;
import cn.edu.bzu.myapplication.R;
import cn.edu.bzu.myapplication.entity.NewsInfo;
public class NewAdapter extends ArrayAdapter<NewsInfo>{
private int resourceID;
public NewAdapter(Context context, int resource, List<NewsInfo> objects) {
super(context, resource, objects);
resourceID=resource;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
NewsInfo fruit=getItem(position);
View view;
ViewHolder viewHolder;
if(convertView==null){
view=LayoutInflater.from(getContext()).inflate(resourceID,null);
viewHolder=new ViewHolder();
viewHolder.siv=(SmartImageView)view.findViewById(R.id.siv_icon);
viewHolder.tv_title=(TextView)view.findViewById(R.id.tv_title);
viewHolder.tv_description=(TextView)view.findViewById(R.id.tv_description);
viewHolder.tv_type=(TextView)view.findViewById(R.id.tv_type);
view.setTag(viewHolder);
}else{
view=convertView;
viewHolder= (ViewHolder) view.getTag();
}
viewHolder.siv.setImageUrl(fruit.getIconPath(),R.drawable.a,R.drawable.ic_launcher);
viewHolder.tv_title.setText(fruit.getTitle());
viewHolder.tv_description.setText(fruit.getDescription());
int type=fruit.getType();
switch (type){
case 1:
viewHolder.tv_type.setText("評論:" fruit.getComment());
viewHolder.tv_type.setTextColor(Color.BLUE);
break;
case 2:
viewHolder.tv_type.setText("專題");
viewHolder.tv_type.setTextColor(Color.BLACK);
break;
case 3:
viewHolder.tv_type.setText("LIVE");
viewHolder.tv_type.setTextColor(Color.RED);
break;
}
return view;
}
class ViewHolder{
SmartImageView siv;
TextView tv_title;
TextView tv_description;
TextView tv_type;
}
}

MainActivity實現程式碼:


package cn.edu.bzu.myapplication;
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.myapplication.Tools.JsonParse;
import cn.edu.bzu.myapplication.adapter.NewAdapter;
import cn.edu.bzu.myapplication.entity.NewsInfo;
import cn.edu.bzu.myapplication.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() {
//fruitList=new ArrayList<>();
//Fruit apple=new Fruit("Apple",R.drawable.apple_pic);
// fruitList.add(apple);
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,"解析失敗",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,"請求失敗",Toast.LENGTH_SHORT).show();
}
});
}
}

在values檔案加下的String.xml檔案中新增:

<string name=”serverurl”>http://172.16.26.58:8080/newInfo.xml</string>

最後一定不要忘了新增網路訪問許可權, 這很重要, 好多同學都犯了這個錯誤、

這樣基本功能就實現了。

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