<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.money104.MainActivity">

    <ListView
        android:id="@+id/lv_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="4dp"
    android:id="@+id/lv_main">
    <ImageView
        android:id="@+id/iv_icon"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:src="http://www.mamicode.com/@mipmap/ic_launcher"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="4dp"
        android:orientation="vertical"
        android:gravity="center"
        >
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:maxLines="1"
            android:text="Title"
            />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="10sp"
            android:maxLines="3"
            android:text="content"
            android:id="@+id/textView" />
    </LinearLayout>
</LinearLayout>

package com.example.administrator.money104;

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.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 {
    public ListView mListView;
    public static final String URL = "http://www.imooc.com/api/teacher?type=4&num=30";
    String jsonString = null;
    String line ="";
    BufferedReader br;
    InputStreamReader isr;
    String result = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.lv_main);
        new NewAsyncTask().execute(URL);
    }
    class NewAsyncTask extends AsyncTask<String,Void,List<NewBean>>{

        @Override
        protected List<NewBean> doInBackground(String... params) {
            return getJsonDate(params[0]);//请求网址
        }
    }

    private List<NewBean> getJsonDate(String url) {
        List<NewBean> newListNewBean = new ArrayList<>();

        try {
            jsonString = readStream(new URL(url).openStream());//URL  为 net的URL**********
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.d("lld",jsonString);
        return newListNewBean;
    }
    private String readStream(InputStream is)
    {


        try {

            isr = new InputStreamReader(is,"utf-8");//字节流转化为字符流
             br = new BufferedReader(isr);
            while ((line = br.readLine())!= null){
                result += result;
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}

wenti