Android studio 之天气预报（Webservice）_andriod studio天气预报

目录

引言：

1.该项目的实现效果

 2.activity_main.xml代码：

 3.MainActivity.java代码：

4.关于开启网络权限的方法：

---

引言：

因为本人在做这个天气预报的时候，遭遇了不少挫折，一直无法通过webservices去访问天气，后来看到返回语句有说是注册一个webservices的账号就行，但不知为何，我一直无法注册成功，明明在测试里头，没有填注册信息也是可以直接访问。再然后找到一个说是免费的一个getWeatherbyCityName，结果也一直不得其法。所以最后做出来这个项目后，决定将这个做好的项目发出来，与大家一起学习！一定要配置好网络权限哈！！！

1.该项目的实现效果

 2.activity_main.xml代码：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
 
 
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/b1"
        android:gravity="center"
        android:textSize="22dp"
        android:textColor="@color/black"
        android:backgroundTint="@color/hui"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.394"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.124" />
 
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/b2"
        android:textColor="@color/black"
        android:gravity="center"
        android:textSize="22dp"
        android:backgroundTint="@color/hui"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.69"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.124" />
 
    <EditText
        android:id="@+id/edit"
        android:layout_width="330dp"
        android:layout_height="500dp"
        android:ems="10"
        android:hint="Small text"
        android:textColorHint="@color/black"
        android:gravity="start|top"
        android:inputType="textMultiLine"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>

 3.MainActivity.java代码：

package com.example.weather;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
 
import androidx.appcompat.app.AppCompatActivity;
 
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.IOException;
 
public class MainActivity extends AppCompatActivity {
 
    private Button b1;
    private Button b2;
    private TextView t1;
    private String result;
    private EditText e1;
    String a;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1=findViewById(R.id.button);
        b2=findViewById(R.id.button2);
        e1=findViewById(R.id.edit);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                a=b1.getText().toString().trim();
                //启动后台异步线程进行连接webService操作，并且根据返回结果在主线程中改变UI
                QueryAddressTask queryAddressTask = new QueryAddressTask();
                //启动后台任务
                queryAddressTask.execute();
            }
        });
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                a=b2.getText().toString().trim();
                //启动后台异步线程进行连接webService操作，并且根据返回结果在主线程中改变UI
                QueryAddressTask queryAddressTask = new QueryAddressTask();
                //启动后台任务
                queryAddressTask.execute();
            }
        });
    }
 
    public static String getWeather(String city) {
        try {
            Document doc;
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            DocumentBuilder db = dbf.newDocumentBuilder();
            //输入要查询的地名
            InputStream is = getSoapInputStream(city);
            doc = db.parse(is);
            NodeList nl = doc.getElementsByTagName("string");
            StringBuffer sb = new StringBuffer();
            for (int count = 0; count < nl.getLength(); count++) {
                Node n = nl.item(count);
                if(n.getFirstChild().getNodeValue().equals("查询结果为空！")) {
                    sb = new StringBuffer("") ;
                    break ;
                }
                sb.append(n.getFirstChild().getNodeValue() + "\n");
            }
            is.close();
            return sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    private static InputStream getSoapInputStream(String city) throws Exception {
        try {
            //执行网页查询操作啦！
            String soap = getSoapRequest(city);
            if (soap == null) {
                return null;
            }
            URL url = new URL(
                    "http://www.webxml.com.cn/WebServices/WeatherWS.asmx");
            URLConnection conn = url.openConnection();
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setDoOutput(true);
            //差点被坑了！！！
//            conn.setRequestProperty("Content-Length", Integer.toString(soap
//                    .length()));
            conn.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
            conn.setRequestProperty("SOAPAction",
                    "http://WebXml.com.cn/getWeather");
            OutputStream os = conn.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os, "utf-8");
            osw.write(soap);
            osw.flush();
            osw.close();
            InputStream is = conn.getInputStream();
            return is;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    private static String getSoapRequest(String city) {
        StringBuilder sb = new StringBuilder();
        sb.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                + "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
                + "xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
                + "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
                + "<soap:Body>    <getWeather xmlns=\"http://WebXml.com.cn/\">"
                + "<theCityCode>" + city
                + "</theCityCode>    </getWeather>"
                + "</soap:Body></soap:Envelope>");
        return sb.toString();
    }
    String result1;
    //执行这些还是得在异步线程里呀，小心翻车
    class QueryAddressTask extends AsyncTask<Void,Integer,Boolean>{
 
        @Override
        protected Boolean doInBackground(Void... voids) {
            result1 = getWeather(a); //在子线程中请求webservice
            return null;
        }
 
        @Override
        protected void onPostExecute(Boolean aBoolean) {
            StringBuilder builder = new StringBuilder();
            e1.setText(result1);
            //Toast.makeText(MainActivity.this, result1, Toast.LENGTH_SHORT).show();
        }
    }
}

4.关于开启网络权限的方法：

具体可以参考一下我上一篇文章和所用到的api：​​​​​​(2条消息) Android Studio之号码归属地查询（Webservice）_芒心008的博客-CSDN博客

因为api不同开启网络权限的方法有些许不同，如果一直不得其法，建议换个api再运行，有不懂的欢迎留言！