Android 天气预报

绝地灬酷狼 2022-07-28 04:06 385阅读 0赞

从开始到完成基本功能差不多一个星期 因为不知道怎么入手和很多导包的问题
在这个项目里我第一次用了线程 网络请求 json解析
所以觉得还是挺有意义的
我在写的时候没有找到讲解特别详细的源码
导致其实理解起来不知道干什么的时候是很没方向和步骤的 所以用写博客的形式把整个思路和流程梳理一遍
写一个界面显示天气接收地点button查询 界面就这个三大部分
关键部分就在从网上得到json键值对 然后解析 显示这三大步骤
界面后面我会贴出代码虽然很丑但是有些控件id还是可以体现出来的
先看一下从网上得到json键值对
从网上得到键值对用了类 一个getURLConnection的函数这个函数在thread类中调用作用是从给定的接口地址（也就是代码中的path）获取对应的信息

  1. public static String getURLConnection(String path) {
  2.         String xml = "";
  3.         System.out.println("sept5");
  4.         try{
  5.             System.out.println("sept6");
  6.             HttpClient client = new DefaultHttpClient();//创建一个httpclient对象
  7.             System.out.println("sept7");
  8.             HttpGet get = new HttpGet(path);
  9.             System.out.println("sept8");
  10.             HttpResponse response = client.execute(get);
  11.             System.out.println("sept9");
  12.             int code = response.getStatusLine().getStatusCode();
  14.             Log.d("http", "code");
  15.             if (code == 200) {
  16.    //如果返回200才算成功才可以继续执行
  17.                 System.out.println("sept3");
  18.                 InputStream reader = response.getEntity().getContent();
  19.                 BufferedReader buffer = new BufferedReader(new InputStreamReader(reader));
  20.                 String list = buffer.readLine();//读一行
  21.                 while (list != null) {
  22.                     xml += list;
  23.                     list = buffer.readLine();
  24.                 }
  25.             }
  27.         }catch (Exception e) {
  28.             e.printStackTrace();
  29.         }
  30.         System.out.println("2222"+xml);
  31.         return xml;
  32.     }
  33.     private class  thread implements Runnable {
  34.         @Override
  35.         public void run() {
  36.             String todayFirst = "http://api.k780.com:88/?app=weather.today&weaid=";
  37.             String todayCity = ed_city.getText().toString();
  38.             System.out.println(todayCity+"sept2");
  39.             String todayLast ="&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";
  40.             System.out.println("sept1"+todayFirst+todayCity+todayLast);
  41.             String todayWeather = getURLConnection(todayFirst+todayCity+todayLast);
  43.             System.out.println("1111"+todayWeather);
  44.             Message msg = new Message();
  45.             Bundle bundle = new Bundle();
  46.             bundle.putString("todayWeather", todayWeather);
  47.             msg.setData(bundle);
  48.             handler.sendMessage(msg);
  49.         }
  50.     }

解析键值对和改变UI信息在下面这个handle中实现

  1. public class Myhandler extends Handler{
  3.         public void handleMessage(Message msg){
  4.             String todayWeather = msg.getData().getString("todayWeather");
  5.             if (!todayWeather.equals("")){
  6.                 try{
  7.                     todayWeather = String.valueOf(new JSONObject(todayWeather).getJSONObject("result"));
  8.                     JSONObject json = new JSONObject(todayWeather);
  9.                     tv_city.setText(json.getString("citynm"));
  10.                     tv_jintian.setText(json.getString("weather"));
  11.                     tv_wendu.setText(json.getString("temp_curr")+"°");
  12.                     tv_fanwei.setText(json.getString("temperature"));
  13.                     tv_priview.setText(todayWeather);
  14.                 } catch (Exception e) {
  15.                     e.printStackTrace();
  16.                 }
  17.             }
  18.         }
  20.     }

以上就可以写实现天气预报的功能了 并没有别的东西 对就只是功能啦！！
以下是源码
xml

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:tools="http://schemas.android.com/tools"
  4.     xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="fill_parent"
  5.     android:layout_height="fill_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
  6.     android:paddingRight="@dimen/activity_horizontal_margin"
  7.     android:paddingTop="@dimen/activity_vertical_margin"
  8.     android:paddingBottom="@dimen/activity_vertical_margin"
  9.     android:background="#ddf0ed"
  10.     app:layout_behavior="@string/appbar_scrolling_view_behavior"
  11.     tools:showIn="@layout/activity_main" tools:context=".MainActivity">
  13.     <EditText
  14.         android:layout_width="wrap_content"
  15.         android:layout_height="70dp"
  16.         android:id="@+id/ed_city"
  17.         android:text="西安"
  18.         android:layout_alignParentTop="true"
  19.         android:layout_alignParentStart="true"
  20.         android:layout_toStartOf="@+id/bt_serch" />
  22.     <Button
  23.         android:layout_width="70dp"
  24.         android:layout_height="70dp"
  25.         android:text="天气"
  26.         android:id="@+id/bt_serch"
  27.         android:background="@drawable/se_button"
  28.         android:layout_alignBottom="@+id/ed_city"
  29.         android:layout_alignParentEnd="true" />
  31.     <LinearLayout
  32.         android:orientation="vertical"
  33.         android:layout_width="fill_parent"
  34.         android:layout_height="match_parent"
  35.         android:layout_below="@+id/ed_city"
  36.         android:weightSum="1"
  37.         android:layout_alignParentStart="true"
  38.         android:layout_alignParentEnd="true">
  40.         <TextView
  41.             android:layout_width="fill_parent"
  42.             android:layout_height="50dp"
  43.             android:text="地区"
  44.             android:textSize="40dp"
  45.             android:gravity="center"
  46.             android:id="@+id/tv_city"
  47.             android:layout_weight="0.18" />
  49.         <TextView
  50.             android:layout_width="fill_parent"
  51.             android:layout_height="30dp"
  52.             android:textSize="25dp"
  53.             android:text="今日天气"
  54.             android:gravity="center"
  55.             android:id="@+id/tv_weather"
  56.             android:layout_weight="0.10" />
  58.         <TextView
  59.             android:layout_width="fill_parent"
  60.             android:layout_height="40dp"
  61.             android:text="今天温度"
  62.             android:gravity="center"
  63.             android:textSize="40dp"
  64.             android:id="@+id/tv_wendu"
  65.             android:layout_weight="0.27" />
  67.         <TextView
  68.             android:layout_width="fill_parent"
  69.             android:layout_height="wrap_content"
  70.             android:text="温度范围"
  71.             android:textSize="25dp"
  72.             android:gravity="center"
  73.             android:id="@+id/tv_fanwei"
  74.             android:layout_weight="0.12" />
  76.         <TextView
  77.             android:layout_width="fill_parent"
  78.             android:layout_height="wrap_content"
  79.             android:text="建议"
  80.             android:id="@+id/tv_advices"
  81.             android:layout_weight="0.29" />
  82.     </LinearLayout>
  84. </RelativeLayout>

mainactivity

  1. package com.example.katherine_qj.weatherday;
  3. import android.os.Bundle;
  4. import android.os.Handler;
  5. import android.os.Message;
  6. import android.support.design.widget.FloatingActionButton;
  7. import android.support.v7.app.AppCompatActivity;
  8. import android.support.v7.widget.Toolbar;
  9. import android.util.Log;
  10. import android.view.View;
  11. import android.view.Menu;
  12. import android.view.MenuItem;
  13. import android.view.Window;
  14. import android.widget.Button;
  15. import android.widget.EditText;
  16. import android.widget.TextView;
  19. import org.apache.http.HttpResponse;
  20. import org.apache.http.client.HttpClient;
  21. import org.apache.http.client.methods.HttpGet;
  22. import org.apache.http.impl.client.DefaultHttpClient;
  23. import org.json.JSONObject;
  25. import java.io.BufferedReader;
  26. import java.io.InputStream;
  27. import java.io.InputStreamReader;
  29. public class MainActivity extends AppCompatActivity {
  31.     private EditText ed_city;
  32.     private Button bt_serch;
  33.     private TextView tv_priview;
  34.     private TextView tv_city;
  35.     private TextView tv_jintian;
  36.     private TextView tv_wendu;
  37.     private  TextView tv_fanwei;
  38.     public static Handler handler;
  39.     private Thread t;
  40.     int i = 1;
  42.     @Override
  43.     protected void onCreate(Bundle savedInstanceState) {
  44.         super.onCreate(savedInstanceState);
  45.         requestWindowFeature(Window.FEATURE_NO_TITLE);
  46.         setContentView(R.layout.activity_main);
  47.         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
  48.         setSupportActionBar(toolbar);
  49.         Init();
  50.         FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
  51.         bt_serch.setOnClickListener(new View.OnClickListener(){
  52.             @Override
  53.             public void onClick(View v) {
  54.                 thread  gt = new  thread();
  55.                 t = new Thread(gt, "Refresh");
  56.                 t.start();
  57.                 handler = new Myhandler();
  58.             }
  59.         }  );
  60.         fab.setOnClickListener(new View.OnClickListener() {
  61.             @Override
  62.             public void onClick(View v) {
  63.                 thread  gt = new  thread();
  64.                 t = new Thread(gt, "Refresh");
  65.                 t.start();
  66.                 handler = new Myhandler();
  67.             }
  68.         });
  70. //        Init();
  71. //        thread  gt = new  thread();
  72. //        t = new Thread(gt, "Refresh");
  73. //        t.start();
  74. //        handler = new Myhandler();
  75.     }
  76.  public void Init (){
  77.      ed_city = (EditText)findViewById(R.id.ed_city);
  78.      bt_serch = (Button)findViewById(R.id.bt_serch);
  79.      tv_priview  =(TextView)findViewById(R.id.tv_advices);
  80.      tv_city = (TextView)findViewById(R.id.tv_city);
  81.      tv_jintian = (TextView)findViewById(R.id.tv_weather);
  82.      tv_wendu = (TextView)findViewById(R.id.tv_wendu);
  83.      tv_fanwei = (TextView)findViewById(R.id.tv_fanwei);
  84.  }
  87.     public static String getURLConnection(String path) {
  88.         String xml = "";
  89.         System.out.println("sept5");
  90.         try{
  91.             System.out.println("sept6");
  92.             HttpClient client = new DefaultHttpClient();//创建一个httpclient对象
  93.             System.out.println("sept7");
  94.             HttpGet get = new HttpGet(path);
  95.             System.out.println("sept8");
  96.             HttpResponse response = client.execute(get);
  97.             System.out.println("sept9");
  98.             int code = response.getStatusLine().getStatusCode();
  100.             Log.d("http", "code");
  101.             if (code == 200) {
  102.    //如果返回200才算成功才可以继续执行
  103.                 System.out.println("sept3");
  104.                 InputStream reader = response.getEntity().getContent();
  105.                 BufferedReader buffer = new BufferedReader(new InputStreamReader(reader));
  106.                 String list = buffer.readLine();//读一行
  107.                 while (list != null) {
  108.                     xml += list;
  109.                     list = buffer.readLine();
  110.                 }
  111.             }
  113.         }catch (Exception e) {
  114.             e.printStackTrace();
  115.         }
  116.         System.out.println("2222"+xml);
  117.         return xml;
  118.     }
  119.     private class  thread implements Runnable {
  121.         @Override
  122.         public void run() {
  123.             String todayFirst = "http://api.k780.com:88/?app=weather.today&weaid=";
  124.             String todayCity = ed_city.getText().toString();
  125.             System.out.println(todayCity+"sept2");
  126.             String todayLast ="&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";
  127.             System.out.println("sept1"+todayFirst+todayCity+todayLast);
  128.             String todayWeather = getURLConnection(todayFirst+todayCity+todayLast);
  130.             System.out.println("1111"+todayWeather);
  131.             Message msg = new Message();
  132.             Bundle bundle = new Bundle();
  133.             bundle.putString("todayWeather", todayWeather);
  134.             msg.setData(bundle);
  135.             handler.sendMessage(msg);
  136.         }
  137.     }
  138.     public class Myhandler extends Handler{
  140.         public void handleMessage(Message msg){
  141.             String todayWeather = msg.getData().getString("todayWeather");
  142.             if (!todayWeather.equals("")){
  143.                 try{
  144.                     todayWeather = String.valueOf(new JSONObject(todayWeather).getJSONObject("result"));
  145.                     JSONObject json = new JSONObject(todayWeather);
  146.                     tv_city.setText(json.getString("citynm"));
  147.                     tv_jintian.setText(json.getString("weather"));
  148.                     tv_wendu.setText(json.getString("temp_curr")+"°");
  149.                     tv_fanwei.setText(json.getString("temperature"));
  150.                     tv_priview.setText(todayWeather);
  151.                 } catch (Exception e) {
  152.                     e.printStackTrace();
  153.                 }
  154.             }
  155.         }
  157.     }
  159.         @Override
  160.     public boolean onCreateOptionsMenu(Menu menu) {
  161.         // Inflate the menu; this adds items to the action bar if it is present.
  162.         getMenuInflater().inflate(R.menu.menu_main, menu);
  163.         return true;
  164.     }
  166.     @Override
  167.     public boolean onOptionsItemSelected(MenuItem item) {
  168.         // Handle action bar item clicks here. The action bar will
  169.         // automatically handle clicks on the Home/Up button, so long
  170.         // as you specify a parent activity in AndroidManifest.xml.
  171.         int id = item.getItemId();
  173.         //noinspection SimplifiableIfStatement
  174.         if (id == R.id.action_settings) {
  175.             return true;
  176.         }
  178.         return super.onOptionsItemSelected(item);
  179.     }
  180. }

还有在实现过程中遇到的问题 使用网络的时候必须要导入这两个包
compile files(‘libs/httpclient-4.4.1.jar’)
compile files(‘libs/httpcore-4.4.1.jar’)
然后必须加上这段代码
packagingOptions {//导入http包的时候必须要加的以下这段话
exclude ‘META-INF/DEPENDENCIES.txt’
exclude ‘META-INF/LICENSE.txt’
exclude ‘META-INF/NOTICE.txt’
exclude ‘META-INF/NOTICE’
exclude ‘META-INF/LICENSE’
exclude ‘META-INF/DEPENDENCIES’
exclude ‘META-INF/notice.txt’
exclude ‘META-INF/license.txt’
exclude ‘META-INF/dependencies.txt’
exclude ‘META-INF/LGPL2.1’
}
还要在androidmanifest文件中加入网络请求

  1. <uses-permission android:name="android.permission.INTERNET"></uses-permission>
  3. over！！！！！

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