22天气预报

Android天气预报

网络数据返回一般是JSON格式，利用网络API实现天气预报功能，API获得网络数据。

http://apistore.baidu.com/astore/serviceinfo/1798.html，网页里有关于API的介绍，可以根据这个学习。

运行实例效果：

下面是代码：

[html] view
plain

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:text="天气预报"

android:textSize="26dp" />

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<EditText

android:id="@+id/myedit"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1111" />

<Button

android:id="@+id/searchweather"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="查询天气 " />

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="城市：" />

<TextView

android:id="@+id/city"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1" />

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="天气：" />

<TextView

android:id="@+id/weather"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1" />

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="实时气温：" />

<TextView

android:id="@+id/temp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1" />

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="最低气温：" />

<TextView

android:id="@+id/h_temp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1" />

</LinearLayout>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:minHeight="30dp"

android:orientation="horizontal" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="最高气温：" />

<TextView

android:id="@+id/l_temp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1" />

</LinearLayout>

</LinearLayout>

下面连接工具类：

[java] view
plain

package org.lxh.demo;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpDownloader {

private URL url = null;

/**

* 根据URL下载文件,前提是这个文件当中的内容是文本,函数的返回值就是文本当中的内容 1.创建一个URL对象

* 2.通过URL对象,创建一个HttpURLConnection对象 3.得到InputStream 4.从InputStream当中读取数据

*

* @param urlStr

* @return

*/

public String download(String urlStr) {

StringBuffer sb = new StringBuffer();

String line = null;

BufferedReader buffer = null;

try {

url = new URL(urlStr);

HttpURLConnection urlConn = (HttpURLConnection) url

.openConnection();

urlConn.setRequestMethod("GET");

urlConn.setConnectTimeout(8000);

urlConn.setReadTimeout(8000);

buffer = new BufferedReader(new InputStreamReader(

urlConn.getInputStream()));

while ((line = buffer.readLine()) != null) {

sb.append(line);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

buffer.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return sb.toString();

}

}

获取返回字符串之后要对此JSON数据进行解析：

[java] view
plain copy

package org.lxh.demo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.json.JSONObject;

public class Util {

public List<Map<String, Object>> getInformation(String jonString)

throws Exception {

JSONObject jsonObject = new JSONObject(jonString);

JSONObject retData = jsonObject.getJSONObject("retData");

List<Map<String, Object>> all = new ArrayList<Map<String, Object>>();

Map<String, Object> map = new HashMap<String, Object>();

map.put("cityName", retData.optString("city"));

map.put("weather", retData.optString("weather"));

map.put("temp", retData.optString("temp"));

map.put("l_temp", retData.optString("l_tmp"));

map.put("h_temp", retData.optString("h_tmp"));

all.add(map);

return all;

}

}

下面Activity程序：

[java] view
plain copy

package org.lxh.demo;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class Main extends Activity {

private EditText citynameEditText;

private Button searchWeatherButton;

private TextView citynametTextView;

private TextView weahterTextView;

private TextView tempTextView;

private TextView h_tempTextView;

private TextView l_tempTextView;

String jonString;

ProgressDialog progressDialog;

private static final int SET = 1;

@SuppressLint("HandlerLeak")

private Handler handler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch (msg.what) {

case SET:

Util util = new Util();

try {

List<Map<String, Object>> all = util

.getInformation(msg.obj.toString());

Iterator<Map<String, Object>> iterator = all.iterator();

while (iterator.hasNext()) {

Map<String, Object> map = iterator.next();

Log.d("天气", map.get("weather").toString());

citynametTextView.setText(map.get("cityName")

.toString());

weahterTextView.setText(map.get("weather").toString());

tempTextView.setText(map.get("temp").toString());

h_tempTextView.setText(map.get("l_temp").toString());

l_tempTextView.setText(map.get("h_temp").toString());

}

} catch (Exception e) {

e.printStackTrace();

} finally {

}

break;

}

}

};

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState); // 生命周期方法

super.setContentView(R.layout.main); // 设置要使用的布局管理器

citynameEditText = (EditText) findViewById(R.id.myedit);

searchWeatherButton = (Button) findViewById(R.id.searchweather);

citynametTextView = (TextView) findViewById(R.id.city);

weahterTextView = (TextView) findViewById(R.id.weather);

tempTextView = (TextView) findViewById(R.id.temp);

h_tempTextView = (TextView) findViewById(R.id.h_temp);

l_tempTextView = (TextView) findViewById(R.id.l_temp);

searchWeatherButton.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

new Thread(new NewThread()).start();

Log.d("按键", "Success");

}

});

}

private class NewThread implements Runnable {

public void run() {

String address = "http://apistore.baidu.com/microservice/weather?citypinyin="

+ citynameEditText.getText().toString();

HttpDownloader httpDownloader = new HttpDownloader();

String jonString = httpDownloader.download(address);

Message msg = Main.this.handler

.obtainMessage(Main.SET, jonString);

Main.this.handler.sendMessage(msg);

}

}

}

问题：查询是只能输拼音，有事无法区分。