[android] 天氣app布局練習（四），androidapp

[android] 天氣app布局練習（四），androidapp

主要練習一下擷取網路資料和解析xml

MainActivity.java

package com.example.weatherreport;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.widget.GridView;import android.widget.SimpleAdapter;import android.widget.TextView;import com.example.weatherreport.contants.ApiContants;import com.example.weatherreport.domain.Weather;import com.example.weatherreport.net.HttpListener;import com.example.weatherreport.net.HttpUtil;public class MainActivity extends Activity {    private GridView gv_airs;    private TextView tv_city;    private TextView tv_number;    private TextView tv_rain;    private TextView tv_cloth;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        gv_airs = (GridView) findViewById(R.id.gv_airs);        tv_city=(TextView) findViewById(R.id.tv_city);        tv_number=(TextView) findViewById(R.id.tv_number);        tv_rain=(TextView) findViewById(R.id.tv_rain);        tv_cloth=(TextView) findViewById(R.id.tv_cloth);        setViewData();        makeGridView();    }    /**     * 設定介面資料     */    private void setViewData() {        String city = null;        try {            city = URLEncoder.encode("北京", "gb2312");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        HttpUtil.get(ApiContants.WEATHER_URL+"?city="+city+"&password=DJOYnieT8234jlsK&day=0", new HttpListener() {            @Override            public void onSuccess(String result) {                Weather weather=(Weather) HttpUtil.xml2object(result);                setViewWeather(weather);                            }            @Override            public void onError(String result) {                System.out.println(result);            }        });    }    protected void setViewWeather(Weather weather) {        tv_city.setText(weather.getCity());        tv_number.setText(weather.getHot());        tv_rain.setText(weather.getRain());        tv_cloth.setText(weather.getCloth());        System.out.println(weather.toString());    }    /**     * 組裝GridView     */    private void makeGridView() {        List<Map<String, String>> data = new ArrayList<>();        Map<String, String> item = null;        item = new HashMap<>();        item.put("title", "83");        item.put("desc", "濕度(%)");        data.add(item);        item = new HashMap<>();        item.put("title", "11.3");        item.put("desc", "可見度(km)");        data.add(item);        item = new HashMap<>();        item.put("title", "2級");        item.put("desc", "東南風");        data.add(item);        item = new HashMap<>();        item.put("title", "最弱");        item.put("desc", "紫外線");        data.add(item);        item = new HashMap<>();        item.put("title", "1005.5");        item.put("desc", "氣壓(mb)");        data.add(item);        item = new HashMap<>();        item.put("title", "22.4");        item.put("desc", "體感");        data.add(item);        SimpleAdapter adapter = new SimpleAdapter(this, data,                R.layout.main_grid_item, new String[] { "title", "desc" },                new int[] { R.id.tv_title, R.id.tv_desc });        gv_airs.setAdapter(adapter);    }}

 

HttpUtil.java

package com.example.weatherreport.net;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.io.StringReader;import java.net.HttpURLConnection;import java.net.URL;import org.xmlpull.v1.XmlPullParser;import android.os.Handler;import android.os.Message;import android.util.Xml;import com.example.weatherreport.domain.Weather;public class HttpUtil {    public static final int SUCCESS = 1;    public static final int ERROR = 2;    /**     * 擷取get資料     *      * @param apiUrl     */    public static void get(final String apiUrl, final HttpListener listener) {        final Handler handler = new HttpHandler(listener);        new Thread(new Runnable() {            @Override            public void run() {                Message msg = new Message();                try {                    URL url = new URL(apiUrl);                    HttpURLConnection conn = (HttpURLConnection) url                            .openConnection();                    conn.setRequestMethod("GET");                    conn.setConnectTimeout(5000);                    int code = conn.getResponseCode();                    if (code == 200) {                        InputStream is = conn.getInputStream();                        String result = readInputStream(is);                        msg.what = SUCCESS;                        msg.obj = result;                        handler.sendMessage(msg);                    } else {                        listener.onError(String.valueOf(code));                    }                } catch (Exception e) {                    e.printStackTrace();                    msg.what = ERROR;                    msg.obj = "網路異常";                    handler.sendMessage(msg);                }            }        }).start();    }    /**     * 讀取輸入資料流     *      * @param is     * @return     */    public static String readInputStream(InputStream is) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        int len = 0;        byte[] buffer = new byte[1024];        try {            while ((len = is.read(buffer)) != -1) {                baos.write(buffer, 0, len);            }            is.close();            byte[] res = baos.toByteArray();            return new String(res);        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /**     * 解析xml     *      * @return     */    public static Object xml2object(String xmlString) {        Weather weather = new Weather();        try {            XmlPullParser pullParser = Xml.newPullParser();            pullParser.setInput(new StringReader(xmlString));            int event = pullParser.getEventType();            while (event != XmlPullParser.END_DOCUMENT) {                switch (event) {                case XmlPullParser.START_TAG:                    String tagName = pullParser.getName();                    if (tagName.equals("Weather") || tagName.equals("Profiles")) {                    } else {                        String tagValue = pullParser.nextText();                        System.out.println(tagName + ":" + tagValue);                        if (tagName.equals("status1")) {                            weather.setRain(tagValue);                        }                        if (tagName.equals("tgd1")) {                            weather.setHot(tagValue);                        }                        if (tagName.equals("chy_l")) {                            weather.setCloth(tagValue);                        }                        if (tagName.equals("city")) {                            weather.setCity(tagValue);                        }                    }                    break;                case XmlPullParser.END_TAG:                default:                    break;                }                event = pullParser.next();            }        } catch (Exception e) {            e.printStackTrace();        }        return weather;    }}/** *  * 位於主線程的Handler * @author taoshihan * */class HttpHandler extends Handler {    private HttpListener listener;    public HttpHandler(HttpListener listener) {        this.listener=listener;    }    @Override    public void handleMessage(Message msg) {        int flag=msg.what;        String res=(String)msg.obj;        if (flag==HttpUtil.SUCCESS) {            listener.onSuccess(res);        }else{            listener.onError(res);        }    }}

HttpListener.java

package com.example.weatherreport.net;public interface HttpListener {    public void onSuccess(String result);    public void onError(String result);}