Android 天气预报

绝地灬酷狼 2022-07-28 04:06 304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

public static String getURLConnection(String path) {
            String xml = "";
            System.out.println("sept5");
            try{
                System.out.println("sept6");
                HttpClient client = new DefaultHttpClient();//创建一个httpclient对象
                System.out.println("sept7");
                HttpGet get = new HttpGet(path);
                System.out.println("sept8");
                HttpResponse response = client.execute(get);
                System.out.println("sept9");
                int code = response.getStatusLine().getStatusCode();
    
                Log.d("http", "code");
                if (code == 200) {
       //如果返回200才算成功才可以继续执行
                    System.out.println("sept3");
                    InputStream reader = response.getEntity().getContent();
                    BufferedReader buffer = new BufferedReader(new InputStreamReader(reader));
                    String list = buffer.readLine();//读一行
                    while (list != null) {
                        xml += list;
                        list = buffer.readLine();
                    }
                }
    
            }catch (Exception e) {
                e.printStackTrace();
            }
            System.out.println("2222"+xml);
            return xml;
        }
        private class  thread implements Runnable {
            @Override
            public void run() {
                String todayFirst = "http://api.k780.com:88/?app=weather.today&weaid=";
                String todayCity = ed_city.getText().toString();
                System.out.println(todayCity+"sept2");
                String todayLast ="&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";
                System.out.println("sept1"+todayFirst+todayCity+todayLast);
                String todayWeather = getURLConnection(todayFirst+todayCity+todayLast);
    
                System.out.println("1111"+todayWeather);
                Message msg = new Message();
                Bundle bundle = new Bundle();
                bundle.putString("todayWeather", todayWeather);
                msg.setData(bundle);
                handler.sendMessage(msg);
            }
        }

解析键值对和改变UI信息在下面这个handle中实现

public class Myhandler extends Handler{
        
            public void handleMessage(Message msg){
                String todayWeather = msg.getData().getString("todayWeather");
                if (!todayWeather.equals("")){
                    try{
                        todayWeather = String.valueOf(new JSONObject(todayWeather).getJSONObject("result"));
                        JSONObject json = new JSONObject(todayWeather);
                        tv_city.setText(json.getString("citynm"));
                        tv_jintian.setText(json.getString("weather"));
                        tv_wendu.setText(json.getString("temp_curr")+"°");
                        tv_fanwei.setText(json.getString("temperature"));
                        tv_priview.setText(todayWeather);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
    
        }

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

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:background="#ddf0ed"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:showIn="@layout/activity_main" tools:context=".MainActivity">
    
        <EditText
            android:layout_width="wrap_content"
            android:layout_height="70dp"
            android:id="@+id/ed_city"
            android:text="西安"
            android:layout_alignParentTop="true"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/bt_serch" />
    
        <Button
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:text="天气"
            android:id="@+id/bt_serch"
            android:background="@drawable/se_button"
            android:layout_alignBottom="@+id/ed_city"
            android:layout_alignParentEnd="true" />
    
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/ed_city"
            android:weightSum="1"
            android:layout_alignParentStart="true"
            android:layout_alignParentEnd="true">
    
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="50dp"
                android:text="地区"
                android:textSize="40dp"
                android:gravity="center"
                android:id="@+id/tv_city"
                android:layout_weight="0.18" />
    
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="30dp"
                android:textSize="25dp"
                android:text="今日天气"
                android:gravity="center"
                android:id="@+id/tv_weather"
                android:layout_weight="0.10" />
    
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="40dp"
                android:text="今天温度"
                android:gravity="center"
                android:textSize="40dp"
                android:id="@+id/tv_wendu"
                android:layout_weight="0.27" />
    
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="温度范围"
                android:textSize="25dp"
                android:gravity="center"
                android:id="@+id/tv_fanwei"
                android:layout_weight="0.12" />
    
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="建议"
                android:id="@+id/tv_advices"
                android:layout_weight="0.29" />
        </LinearLayout>
    
    </RelativeLayout>

mainactivity

package com.example.katherine_qj.weatherday;
    
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.support.design.widget.FloatingActionButton;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.util.Log;
    import android.view.View;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.Window;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    
    
    import org.apache.http.HttpResponse;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.json.JSONObject;
    
    import java.io.BufferedReader;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    
    public class MainActivity extends AppCompatActivity {
        
        private EditText ed_city;
        private Button bt_serch;
        private TextView tv_priview;
        private TextView tv_city;
        private TextView tv_jintian;
        private TextView tv_wendu;
        private  TextView tv_fanwei;
        public static Handler handler;
        private Thread t;
        int i = 1;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
            Init();
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            bt_serch.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
                    thread  gt = new  thread();
                    t = new Thread(gt, "Refresh");
                    t.start();
                    handler = new Myhandler();
                }
            }  );
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    thread  gt = new  thread();
                    t = new Thread(gt, "Refresh");
                    t.start();
                    handler = new Myhandler();
                }
            });
    
    //        Init();
    //        thread  gt = new  thread();
    //        t = new Thread(gt, "Refresh");
    //        t.start();
    //        handler = new Myhandler();
        }
     public void Init (){
         ed_city = (EditText)findViewById(R.id.ed_city);
         bt_serch = (Button)findViewById(R.id.bt_serch);
         tv_priview  =(TextView)findViewById(R.id.tv_advices);
         tv_city = (TextView)findViewById(R.id.tv_city);
         tv_jintian = (TextView)findViewById(R.id.tv_weather);
         tv_wendu = (TextView)findViewById(R.id.tv_wendu);
         tv_fanwei = (TextView)findViewById(R.id.tv_fanwei);
     }
    
    
        public static String getURLConnection(String path) {
            String xml = "";
            System.out.println("sept5");
            try{
                System.out.println("sept6");
                HttpClient client = new DefaultHttpClient();//创建一个httpclient对象
                System.out.println("sept7");
                HttpGet get = new HttpGet(path);
                System.out.println("sept8");
                HttpResponse response = client.execute(get);
                System.out.println("sept9");
                int code = response.getStatusLine().getStatusCode();
    
                Log.d("http", "code");
                if (code == 200) {
       //如果返回200才算成功才可以继续执行
                    System.out.println("sept3");
                    InputStream reader = response.getEntity().getContent();
                    BufferedReader buffer = new BufferedReader(new InputStreamReader(reader));
                    String list = buffer.readLine();//读一行
                    while (list != null) {
                        xml += list;
                        list = buffer.readLine();
                    }
                }
    
            }catch (Exception e) {
                e.printStackTrace();
            }
            System.out.println("2222"+xml);
            return xml;
        }
        private class  thread implements Runnable {
        
            @Override
            public void run() {
                String todayFirst = "http://api.k780.com:88/?app=weather.today&weaid=";
                String todayCity = ed_city.getText().toString();
                System.out.println(todayCity+"sept2");
                String todayLast ="&&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";
                System.out.println("sept1"+todayFirst+todayCity+todayLast);
                String todayWeather = getURLConnection(todayFirst+todayCity+todayLast);
    
                System.out.println("1111"+todayWeather);
                Message msg = new Message();
                Bundle bundle = new Bundle();
                bundle.putString("todayWeather", todayWeather);
                msg.setData(bundle);
                handler.sendMessage(msg);
            }
        }
        public class Myhandler extends Handler{
        
            public void handleMessage(Message msg){
                String todayWeather = msg.getData().getString("todayWeather");
                if (!todayWeather.equals("")){
                    try{
                        todayWeather = String.valueOf(new JSONObject(todayWeather).getJSONObject("result"));
                        JSONObject json = new JSONObject(todayWeather);
                        tv_city.setText(json.getString("citynm"));
                        tv_jintian.setText(json.getString("weather"));
                        tv_wendu.setText(json.getString("temp_curr")+"°");
                        tv_fanwei.setText(json.getString("temperature"));
                        tv_priview.setText(todayWeather);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
    
        }
    
            @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.menu_main, menu);
            return true;
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle action bar item clicks here. The action bar will
            // automatically handle clicks on the Home/Up button, so long
            // as you specify a parent activity in AndroidManifest.xml.
            int id = item.getItemId();
    
            //noinspection SimplifiableIfStatement
            if (id == R.id.action_settings) {
                return true;
            }
    
            return super.onOptionsItemSelected(item);
        }
    }

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

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

over！！！！！