标签：
Android——百度APIstore+Json——获取新闻频道+新闻数据
<span style="font-size:18px;"><strong>package com.example.jreduch08.util;
import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileUitlity {
private static String ROOT_CACHE;
private static FileUitlity instance = null;
private FileUitlity() {
}
public static FileUitlity getInstance(Context context,String root_dir) {
if (instance == null) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
ROOT_CACHE = (Environment.getExternalStorageDirectory() + "/"
+ root_dir + "/");
} else {
ROOT_CACHE = (context.getFilesDir().getAbsolutePath() + "/"+root_dir+"/");
}
File dir = new File(ROOT_CACHE);
if (!dir.exists()) {
dir.mkdirs();
}
instance = new FileUitlity();
}
return instance;
}
public File makeDir(String dir) {
File fileDir = new File(ROOT_CACHE + dir);
if (fileDir.exists()) {
return fileDir;
} else {
fileDir.mkdirs();
return fileDir;
}
}
public static String saveFileToSdcard(String fileName,String content){
String state = Environment.getExternalStorageState();
if(!state.equals(Environment.MEDIA_MOUNTED)){
return "SD卡未就绪";
}
File root = Environment.getExternalStorageDirectory();
FileOutputStream fos = null;
try {
fos = new FileOutputStream(root+"/"+fileName);
fos.write(content.getBytes());
return "ok";
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if(fos!=null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return "";
}
}
</strong></span>package com.example.jreduch08.util;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
/**
* Created by 冲天之峰 on 2016/8/17.
*/
public class HttpUtil {
public static String HttpGet(String uri){
HttpURLConnection con = null;//为了抛异常
InputStream is = null;
BufferedReader reader=null;
String result=null;
StringBuffer sbf=new StringBuffer();
try {
URL url = new URL(uri);
con = (HttpURLConnection) url.openConnection();
con.setRequestProperty("apikey","5b46143955a4b1ff1b470a94315625cd");
con.setConnectTimeout(5 * 1000);
con.setReadTimeout(5 * 1000);
//http响应码200成功 404未找到 500发生错误
if (con.getResponseCode() == 200) {
is = con.getInputStream();
reader =new BufferedReader(new InputStreamReader(is,"UTF-8"));
String strRead=null;
while ((strRead = reader.readLine())!=null) {
sbf.append(strRead);
sbf.append("\r\n");
Log.d("==j==", "200");
}
reader.close();
result=sbf.toString();
Log.d("=====",result);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}if (con != null) {
con.disconnect();
}
}
return result;
}
}
package com.example.jreduch08.util;
/**
* Created by 冲天之峰 on 2016/8/17.
*/
public class UrlUtil {
//获取 频道的网络接口
public static String channelUrl = "http://apis.baidu.com/showapi_open_bus/channel_news/channel_news";
/*获取 频道对应新闻的网络接口
get 请求参数：
channelId : 新闻频道id，必须精确匹配
channelName :新闻频道名称，可模糊匹配
title :新闻标题，模糊匹配
page :页数，默认1。每页最多20条记
needContent : 是否需要返回正文，1为需要
needHtml :是否需要返回正文的html格式，1为需要
*/
public static String newsUrl = "http://apis.baidu.com/showapi_open_bus/channel_news/search_news";
}
以上是三个工具+方法
package com.example.jreduch08;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.example.jreduch08.util.HttpUtil;
import com.example.jreduch08.util.UrlUtil;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class HttpJsonActivity extends AppCompatActivity {
private String httpurl;
private TextView tv;
private Spinner channe1;
private SimpleAdapter sa;
private List<Map<String,String>> channe1List;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_http_json);
tv=(TextView)findViewById(R.id.tv);
channe1=(Spinner)findViewById(R.id.channe1);
channe1List=new ArrayList<>();
sa=new SimpleAdapter(this,channe1List,android.R.layout.simple_spinner_item,
new String[]{"name"},new int[]{android.R.id.text1});
channe1.setAdapter(sa);
new GetChanel().execute();
channe1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Map<String,String> map=channe1List.get(position);
String channelName=map.get ("name");
String channelId=map.get(channelName);
String url=UrlUtil.newsUrl+"?channelId="+channelId
+"&channerlName="+channelName
+"&needContent=1"+"&needHtml=1"
;
new GetNew().execute(url);
// tv.setText(channe1.getSelectedItem().toString());
// Toast.makeText(getBaseContext(),"点击了新闻"+position,Toast.LENGTH_SHORT).show();
// Toast.makeText(getBaseContext(),channe1.getSelectedItemId()+"",Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
//获取频道
public class GetChanel extends AsyncTask<Void,Void,String>{
@Override
protected String doInBackground(Void... strings) {
return HttpUtil.HttpGet(UrlUtil.channelUrl);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (s.equals(""))
{
Toast.makeText(getBaseContext(),"没有数据",Toast.LENGTH_SHORT).show();
}
try {
JSONObject obj=new JSONObject(s);
JSONObject body=obj.getJSONObject("showapi_res_body");
JSONArray ja=body.getJSONArray("channelList");
for (int i=0;i<ja.length();i++)
{
JSONObject channelObj=(JSONObject)ja.get(i);
String id=channelObj.getString("channelId");
String name=channelObj.getString("name");
Map map=new HashMap();
map.put("name",name);
map.put(name,id);
channe1List.add(map);
}
sa.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
//获取新闻
public class GetNew extends AsyncTask<String,Void,String>{
@Override
protected String doInBackground(String... strings) {
return HttpUtil.HttpGet(strings[0]);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (s.equals("")){
tv.setText("没有数据");
}else{
tv.setText(s);}
}
}
}
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.jreduch08.HttpJsonActivity">
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/channe1"
></Spinner>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/channe1"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv"
/>
</ScrollView>
</RelativeLayout>
<span style="font-size:18px;"><strong>package com.example.jreduch08;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import com.example.jreduch08.util.FileUitlity;
import com.example.jreduch08.util.HttpUtil;
import com.example.jreduch08.util.UrlUtil;
public class APIActivity extends AppCompatActivity {
private String httpurl;
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_api);
tv= (TextView) findViewById(R.id.tv);
httpurl="http://apis.baidu.com/showapi_open_bus/channel_news/channel_news";
new MyGetJson().execute(UrlUtil.channelUrl);
}
//访问网络异步任务类
public class MyGetJson extends AsyncTask<String,Void,String> {
// onPostExecute在主线程中执行命令
//doInBackground在子线程中执行命令
//doInBackground执行之后会到onPostExecute中
@Override
protected String doInBackground(String... params) {
return HttpUtil.HttpGet(params[0]);
}
// HttpURLConnection con = null;//为了抛异常
// InputStream is = null;
// BufferedReader reader=null;
// String result=null;
// StringBuffer sbf=new StringBuffer();
//
// try {
// URL url = new URL(httpurl);
// con = (HttpURLConnection) url.openConnection();
// con.setRequestProperty("apikey","5b46143955a4b1ff1b470a94315625cd");
// con.setConnectTimeout(5 * 1000);
// con.setReadTimeout(5 * 1000);
// //http响应码200成功 404未找到 500发生错误
// if (con.getResponseCode() == 200) {
// is = con.getInputStream();
// reader =new BufferedReader(new InputStreamReader(is,"UTF-8"));
// String strRead=null;
// while ((strRead = reader.readLine())!=null) {
// sbf.append(strRead);
// sbf.append("\r\n");
// Log.d("==j==", "200");
// }
// reader.close();
// result=sbf.toString();
// Log.d("=====",result);
// }
// } catch (MalformedURLException e) {
// e.printStackTrace();
// } catch (IOException e) {
// e.printStackTrace();
// } finally {
// if (is != null) {
// try {
// is.close();
// } catch (IOException e) {
// e.printStackTrace();
// }
// }if (con != null) {
// con.disconnect();
// }
// }
// return result;
// }
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
tv.setText(s);
saveFile(s);
Log.d("==j==", "2");
}
}
//保存文件到SD卡
public void saveFile(String s) {
Toast.makeText(this, FileUitlity.saveFileToSdcard("/abcdef.txt",s),Toast.LENGTH_SHORT).show();
}
// FileOutputStream fos=null;
// //获取SD卡状态
// String state= Environment.getExternalStorageState();
// //判断SD卡是否就绪
// if(!state.equals(Environment.MEDIA_MOUNTED)){
// Toast.makeText(this,"请检查SD卡",Toast.LENGTH_SHORT).show();
// return;
// }
// //取得SD卡根目录
// File file= Environment.getExternalStorageDirectory();
//
// try {
// Log.d("=====SD卡根目录：",file.getCanonicalPath().toString());
//// File myFile=new File(file.getCanonicalPath()+"/sd.txt");
//// fos=new FileOutputStream(myFile);
// //输出流的构造参数1可以是 File对象 也可以是文件路径
// //输出流的构造参数2：默认为False=>覆盖内容；ture=》追加内容
// //追加 ，ture
// fos=new FileOutputStream(file.getCanonicalPath()+"/sdsdsd.txt");
// String str=s;
// fos.write(str.getBytes());
// Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
// } catch (IOException e) {
// e.printStackTrace();
// }finally {
// if (fos!=null){
// try {
// fos.close();
// } catch (IOException e) {
// e.printStackTrace();
// }
// }
// }
// }
}
</strong></span>
Android——百度APIstore+Json——获取新闻频道+新闻数据
标签：
原文地址：http://blog.csdn.net/zhangyufeng0126/article/details/52233899
