创建一个item_layout.xml布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/iv_icon"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="64dp"
android:layout_height="64dp"
android:src="@mipmap/ic_launcher"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="4dp"
android:orientation="vertical">
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="15sp"
android:maxLines="1"
android:text="Title"/>
<TextView
android:id="@+id/tv_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="10sp"
android:maxLines="3"
android:text="Content"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
效果图:
然后在主界面activity_main.xml中创建一个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="match_parent">
<ListView
android:id="@+id/lv_main"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</RelativeLayout>
布局完成了!然后就是要完成获取数据
创建一个NewsBean.java
public class NewsBean {
public String newsIconUrl;
public String newsTitle;
public String newsContent;
}
在主函数MainActivity.java
package com.example.huang.myapplication;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
//创建mListView获取ListView布局
private ListView mListView;
//网址
private static String URL = "http://www.imooc.com/api/teacher?type=4&num=30";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView) findViewById(R.id.lv_main);
new NewsAsyncTask().execute(URL);
}
private List<NewsBean> getJsonData(String url) {
List<NewsBean> newsBeanList = new ArrayList<>();
//获取网页返回的字符串
String jsonString = null;
try {
//调用readStream方法读取网页url的信息返回到jsonString
jsonString = readStream(new URL(url).openStream());
Log.d("hj",jsonString);
} catch (IOException e) {
e.printStackTrace();
}
return newsBeanList;
}
//读取网页返回信息
private String readStream(InputStream is) {
InputStreamReader isr;
String result = "";
try {
String line = "";
//字节流转化为字符流
isr = new InputStreamReader(is, "utf-8");
//字符流利用BufferedReader读取出来
BufferedReader br = new BufferedReader(isr);
//如果不为内容空,读取到result中
while ((line=br.readLine()) != null) {
result += line;
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
//AsyncTask<传入一个String网址,不需要记录中间过程Void,返回NewsBean的集合>
class NewsAsyncTask extends AsyncTask<String, Void, List<NewsBean>> {
@Override
protected List<NewsBean> doInBackground(String... strings) {
//strings就一个,传进来的网址
return getJsonData(strings[0]);
}
}
}