关于Android中http请求Gosn解析的一些个人见解：首先是XML中构建布局：在布局里面建一个listview用来展示Gson解析的字符

来源：互联网发布：godaddy 域名优惠码编辑：程序博客网时间：2024/06/10 02:30

然后建一个listview内的布局item：

关于item我也就不多述了

然后是主类：

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import com.google.gson.Gson;
import Java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.NET.HttpURLConnection;
import java.net.MalformedURLException;
import java.Net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private ListView list_view;
private String data;
private List<RootBean.NewslistEntity.NewsEntity> list;
private MyBaseAdapter adapter;

//handler耗时操作

Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
list_view.setAdapter(adapter);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list_view = (ListView) findViewById(R.id.list_view);

//Gson包导过来
final Gson gson = new Gson();
list = new ArrayList<>();

//new一个线程
new Thread(new Runnable() {
@Override
public void run() {

//调用getData();
data = getData();
Log.e(TAG, "run: " + data);

//做Gson解析
RootBean rootBean = gson.fromJson(data, RootBean.class);
RootBean.NewslistEntity newslist = rootBean.getNewslist();
List<RootBean.NewslistEntity.NewsEntity> news = newslist.getNews();
//往list里添加数据

list.addAll(news);
adapter = new MyBaseAdapter(MainActivity.this, list);
handler.sendEmptyMessage(1);
}
}).start();
}
private String getData() {
try {

//做网络请求
URL url = new URL("http://huixinguiyu.cn/Assets/js/newsnew.js");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(1024 * 8);
connection.setReadTimeout(1024 * 8);
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == 200) {
InputStream inputStream = connection.getInputStream();
int len = 0;
//缓冲区一次读取1024*8
byte[] buf = new byte[1024 * 8];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((len = inputStream.read(buf)) != -1) {
baos.write(buf, 0, len);
}
baos.close();

//返回值
return baos.toString();
} else {
Log.e(TAG, "onCreate: Error" + responseCode);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}

然后listview适配器类：

private Context context;
private List<RootBean.NewslistEntity.NewsEntity> list;
public MyBaseAdapter(Context context, List<RootBean.NewslistEntity.NewsEntity> list) {
this.context = context;
this.list = list;
}
@Override
public int getCount() {
return list.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) {
ViewHolder holder = null;
if (view == null) {
holder = new ViewHolder();
view = view.inflate(context, R.layout.item, null);
holder.image_view_item = view.findViewById(R.id.image_view_item);
holder.tv_title_item = view.findViewById(R.id.tv_title_item);
holder.tv_content = view.findViewById(R.id.tv_content)
holder.tv_number = view.findViewById(R.id.tv_number);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.tv_title_item.setText(list.get(i).getTitle());
holder.tv_content.setText(list.get(i).getDetail());
holder.tv_number.setText(list.get(i).getComment());
ImageLoaderUtils.setImageView(list.get(i).getImage(), context, holder.image_view_item);
return view;
}
static class ViewHolder {
TextView tv_title_item, tv_content, tv_number;
ImageView image_view_item;
}
}

再然后是json串工具类：

public class RootBean {
private List<NewsEntity> news;
public void setNews(List<NewsEntity> news) {
this.news = news;
}
public List<NewsEntity> getNews() {
return news;
}
public static class NewsEntity {
private String title;
private String detail;
private String comment;
private String image;
public void setTitle(String title) {
this.title = title;
}
public void setDetail(String detail) {
this.detail = detail;
}
public void setComment(String comment) {
this.comment = comment;
}
public void setImage(String image) {
this.image = image;
}
public String getTitle() {
return title;
}
public String getDetail() {
return detail;
}
public String getComment() {
return comment;
}
public String getImage() {
return image;
}
}
}
}

最后是imageLoader：public class ImageLoaderUtils {
public static void setImageView(String url, Context context, ImageView imageView) {
//初始化
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).build();
//创建Imageloader 对象
ImageLoader imageLoader = ImageLoader.getInstance();
//设置初始化
imageLoader.init(config);
DisplayImageOptions options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.mipmap.ic_launcher) //设置图片在下载期间显示的图片
.showImageForEmptyUri(R.mipmap.ic_launcher)//设置图片Uri为空或是错误的时候显示的图片
.showImageOnFail(R.mipmap.ic_launcher) //设置图片加载/解码过程中错误时候显示的图片
.cacheInMemory(true)//设置下载的图片是否缓存在内存中
.cacheOnDisk(true)//设置下载的图片是否缓存在SD卡中
.imageScaleType(ImageScaleType.IN_SAMPLE_INT)//设置图片以如何的编码方式显示
.bitmapConfig(Bitmap.Config.RGB_565)//设置图片的解码类型
.build();//构建完成
imageLoader.displayImage(url, imageView, options);
}
}

以上都是本人练习时的一些作品，如有错误之处请指教。

阅读全文

0 0

关于Android中http请求Gosn解析的一些个人见解： 首先是XML中构建布局： 在布局里面建一个listview用来展示Gson解析的字符

关于Android中http请求Gosn解析的一些个人见解：首先是XML中构建布局：在布局里面建一个listview用来展示Gson解析的字符