2018-01-13
原CSDN博客已弃用，文章会逐渐迁移过来。
添加依赖
build.gradle
dependencies {
compile 'com.google.code.gson:gson:2.4'
}
右上角Sync Now
在AndroidManifest.xml中添加网络访问权限
<uses-permission android:name="android.permission.INTERNET"/>
主页面布局
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:id="@+id/activity_main"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.httpdemo.MainActivity">
<TextView
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="48dp"
android:text="慕课"
android:textSize="28sp"
android:gravity="center"
android:textColor="#ffffff"
android:background="#3f51b5"
android:paddingRight="15dp"/>
<ImageView
android:id="@+id/banner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"/>
<ListView
android:id="@+id/essay_view"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</LinearLayout>
被跳转页面布局
activity_detail.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:id="@+id/content_detail"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:showIn="@layout/activity_detail"
android:orientation="vertical" >
<TextView
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="24sp"
android:gravity="center"
android:layout_marginTop="15dp" />
<TextView
android:id="@+id/author"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:gravity="right"
android:paddingRight="10dp"
android:layout_marginTop="15dp"/>
<TextView
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="8dp"
android:layout_marginTop="15dp"
android:layout_weight="1"
android:lineSpacingMultiplier="1.5"
android:textSize="20sp" />
</LinearLayout>
数据实体类
Essay.java
package com.administrator.hellodemo;
public class Essay {
private String title;
private String author;
private String content;
public Essay(String title, String author, String content) {
this.title = title;
this.author = author;
this.content = content;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
主页面Java代码
MainActivity.java
package com.administrator.hellodemo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
findViewById(R.id.header).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,DetailActivity.class));
}
});
}
}
被跳转页Java代码
package com.administrator.hellodemo;
import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import com.google.gson.Gson;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class DetailActivity extends Activity {
private TextView nameView,authorView,contentView;
private int id;
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Essay e = (Essay) msg.obj;
nameView.setText(e.getTitle());
authorView.setText(e.getAuthor());
contentView.setText(e.getContent());
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Intent it = getIntent();
id = it.getIntExtra("essay",1);
initView();
initData();
}
public void initView(){
nameView = (TextView) findViewById(R.id.name);
authorView = (TextView) findViewById(R.id.author);
contentView = (TextView) findViewById(R.id.content);
}
public void initData(){
//HttpUrlConnection
/**
* 1.实例化一个url对象
* 2.获取HttpUrlConnection对象
* 3.设置请求连接属性
* 4.获取响应码，判断是否连接成功
* 5.读取输入流并解析
*/
//参数：你要访问的接口地址
new Thread(){
@Override
public void run() {
try {
URL url = new URL("http://www.imooc.com/api/teacher?type=3&cid="+id );
HttpURLConnection coon = (HttpURLConnection) url.openConnection();
coon.setRequestMethod("GET");
coon.setReadTimeout(6000);
//获取响应码
if(coon.getResponseCode() == 200){
//获取输入流
InputStream in = coon.getInputStream();
byte[] b = new byte[1024*512];
int len = 0;
//建立缓存流，保存所读取的字节数组
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((len = in.read(b)) > -1){
baos.write(b,0,len);
}
String msg = baos.toString();
Log.e("TAG",msg);
//JSON数据的解析：
JSONObject obj = new JSONObject(msg);
//HashMap map = null;
//map.get("age")
int status = obj.getInt("status");
String msg2 = obj.getString("msg");
Log.e("TAG",status + " " + msg2);
//1.创建Gson对象
Gson gson = new Gson();
//参数1：满足json对象格式的字符串
String data = obj.getString("data");
Essay e = gson.fromJson(data,Essay.class);
/*JSONObject data = obj.getJSONObject("data");
String title = data.getString("title");
String author = data.getString("author");
String content = data.getString("content");
Log.e("TAG","标题：" + title + "，作者：" + author + "，内容：" + content);*/
//将操作权交还给主线程
Message message = handler.obtainMessage();
//Essay e = new Essay(title,author,content);
message.obj =e;
//调用此方法，则会触发主线程中Handle对象里覆盖了的handleMessage方法
handler.sendMessage(message);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
}
}.start();
}
}