怎么在Android应用中模拟一个新闻客户端
这期内容当中小编将会给大家带来有关怎么在Android应用中模拟一个新闻客户端，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
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首先我们创建一个JsonParse类用来解析json文件：
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 getNewInfo(String json){
Gson gson=new Gson();
Type listType=new TypeToken>(){
}.getType();
List newsInfos=gson.fromJson(json,listType);
return newsInfos;
}
} 创建json文件的实体类：
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"?>
item的布局文件：
<?xml version="1.0" encoding="utf-8"?>
适配器代码：
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{ private int resourceID; public NewAdapter(Context context, int resource, List 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("评论："+fruit.getComment()); viewHolder.tv_type.setTextColor(Color.BLUE); break; case 2: viewHolder.tv_type.setText("专题"); 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实现代码：
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 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();
}
});
}
} 在values文件加下的String.xml文件中添加：
最后一定不要忘了添加网络访问权限
上述就是小编为大家分享的怎么在Android应用中模拟一个新闻客户端了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注创新互联行业资讯频道。
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