Xml解析天气预告

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Xml解析天气预告

public class MainActivity extends Activity {
        private String TAG = "MainActivity";
        private TextView text_main_info;
        private Spinner spinner_main_provinces;
        private ListView listView_main_weather;
        // 以下定义的集合用来存放省的名称及拼音信息
        private List<Map<String,String>> list_province_map = null;
        // 以下定义的集合用来存放省的名称
        private List<String> list_province_name = new ArrayList<String>();
        // 以下定义的集合用来存放省的拼音
        private List<String> list_province_py = new ArrayList<String>();
        private String urlString = "http://flash.weather.com.cn/wmaps/xml/";
        private boolean flag = false;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                text_main_info = (TextView) findViewById(R.id.text_main_info);
                spinner_main_provinces = (Spinner) findViewById(R.id.spinner_main_provinces);
                listView_main_weather = (ListView) findViewById(R.id.listView_main_weather);

                // 解析省的xml文件获取到所有省的名称和省的拼音
                list_province_map = getProvinceMsg();
                for (int i = 0; i < list_province_map.size(); i++) {
                        list_province_name.add(list_province_map.get(i).get("quName"));
                        list_province_py.add(list_province_map.get(i).get("pyName"));
                }

                // 给Spinner中设置适配器
                ArrayAdapter<String> proviceAdapter = new ArrayAdapter<String>(
                                MainActivity.this,android.R.layout.simple_dropdown_item_1line,list_province_name);
                spinner_main_provinces.setAdapter(proviceAdapter);

                // 给Spinner设置监听器
                spinner_main_provinces
                                .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                                        // 当spinner的item别选中时,执行异步任务访问网络,通过网络获取天气数据
                                        @Override
                                        public void onItemSelected(AdapterView<?> parent,View view,int position,long id) {
                                                String urlName = list_province_py.get(position);
                                                if (flag) {
                                                        new MyTask(MainActivity.this).execute(urlString
                                                                        + urlName + ".xml");
                                                } else {
                                                        Toast.makeText(MainActivity.this,"请选择省直辖市查看当地天气!",5000).show();
                                                        flag = true;
                                                }
                                        }

                                        @Override
                                        public void onNothingSelected(AdapterView<?> parent) {
                                        }
                                });
        }

        // 异步任务,执行网络访问
        class MyTask extends AsyncTask<String,Void,byte[]> {
                private Context context;
                private ProgressDialog pDialog = null;

                public MyTask(Context context) {
                        this.context = context;
                        pDialog = new ProgressDialog(context);
                        pDialog.setIcon(R.drawable.ic_launcher);
                        pDialog.setMessage("数据加载中......");
                }

                @Override
                protected void onPreExecute() {
                        super.onPreExecute();
                        pDialog.show();
                }

                @Override
                protected byte[] doInBackground(String... params) {
                        BufferedInputStream bis = null;
                        HttpURLConnection httpConn = null;
                        ByteArrayOutputStream baos = null;
                        // 访问网络,通过网络获取URL地址中的数据
                        try {
                                URL url = new URL(params[0]);
                                httpConn = (HttpURLConnection) url.openConnection();
                                httpConn.connect();
                                if (httpConn.getResponseCode() == 200) {
                                        baos = new ByteArrayOutputStream();
                                        bis = new BufferedInputStream(httpConn.getInputStream());

                                        byte[] buffer = new byte[256];
                                        int c = 0;
                                        while ((c = bis.read(buffer)) != -1) {
                                                baos.write(buffer,c);
                                                baos.flush();
                                        }
                                        return baos.toByteArray();
                                }
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                        return null;
                }

                @Override
                protected void onPostExecute(byte[] result) {
                        super.onPostExecute(result);
                        if (result != null) {
                                // 将网络访问返回的数据进行xml解析,解析后的数据放到list集合中
                                List<Map<String,String>> list = getCityWeather(result);
                                // 将list作为自定义适配器的参数,构建自定义适配器
                                BaseAdapter weatherAdapter = new MyAdapter(MainActivity.this,list);
                                // 给listview设置适配器
                                listView_main_weather.setAdapter(weatherAdapter);
                        } else {
                                Toast.makeText(context,"网络访问异常!",5000).show();
                        }
                        pDialog.dismiss();
                }
        }

        // 解析资源xml目录下的xml文件获取到省、直辖市的名称信息,将数据放到list集合中
        public List<Map<String,String>> getProvinceMsg() {
                try {
                        XmlResourceParser pullParser = getResources()
                                        .getXml(R.xml.province);
                        List<Map<String,String>> list = null;
                        Map<String,String> map = null;
                        int event = pullParser.getEventType();
                        while (event != 1) {
                                Log.i(TAG,"==" + event);
                                String nodeName = pullParser.getName();
                                switch (event) {
                                case 0:
                                        list = new ArrayList<Map<String,String>>();
                                        break;
                                case 2:
                                        if (nodeName.equals("city")) {
                                                map = new HashMap<String,String>();
                                                String quName = pullParser.getAttributeValue(0);
                                                String pyName = pullParser.getAttributeValue(1);
                                                map.put("quName",quName);
                                                map.put("pyName",pyName);
                                                list.add(map);
                                        }
                                        break;
                                }
                                event = pullParser.next();
                        }
                        return list;
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return null;
        }

        // 将从网络获取到的字节数组作为参数传进方法中,利用xml解析,获取到其中的天气数据,将这些数据放到list集合中
        public List<Map<String,String>> getCityWeather(byte[] data) {
                try {
                        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
                        XmlPullParser pullParser = factory.newPullParser();
                        pullParser.setInput(new ByteArrayInputStream(data),"UTF-8");
                        List<Map<String,String> map = null;
                        int event = pullParser.getEventType();

                        while (event != 1) {
                                String nodeName = pullParser.getName();

                                switch (event) {
                                case 0:
                                        list = new ArrayList<Map<String,String>();
                                                for (int i = 0; i < pullParser.getAttributeCount(); i++) {
                                                        map.put(pullParser.getAttributeName(i),pullParser.getAttributeValue(i));
                                                }
                                                list.add(map);
                                        }
                                        break;
                                }
                                event = pullParser.next();
                        }
                        return list;
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return null;
        }

        // 自定义适配器,目的是给ListView加载数据
        class MyAdapter extends BaseAdapter {
                private Context context = null;
                private List<Map<String,String>> list = null;

                public MyAdapter(Context context,List<Map<String,String>> list) {
                        this.context = context;
                        this.list = list;
                }

                @Override
                public int getCount() {
                        return list.size();
                }

                @Override
                public Object getItem(int position) {
                        return list.get(position);
                }

                @Override
                public long getItemId(int position) {
                        return position;
                }

                @Override
                public View getView(int position,View convertView,ViewGroup parent) {
                        ViewHolder mHolder;
                        if (convertView == null) {
                                mHolder = new ViewHolder();
                                LayoutInflater inflater = LayoutInflater.from(context);
                                convertView = inflater.inflate(
                                                R.layout.item_listview_main_weather,parent,false);

                                mHolder.text_item_listview_cityname = (TextView) convertView
                                                .findViewById(R.id.text_item_listview_cityname);
                                mHolder.text_item_listview_temp = (TextView) convertView
                                                .findViewById(R.id.text_item_listview_temp);
                                mHolder.text_item_listview_stateDetailed = (TextView) convertView
                                                .findViewById(R.id.text_item_listview_stateDetailed);
                                mHolder.text_item_listview_wind = (TextView) convertView
                                                .findViewById(R.id.text_item_listview_wind);
                                mHolder.text_item_listview_humidity = (TextView) convertView
                                                .findViewById(R.id.text_item_listview_humidity);
                                mHolder.imageView_item_listview_state1 = (ImageView) convertView
                                                .findViewById(R.id.imageView_item_listview_state1);
                                mHolder.imageView_item_listview_state2 = (ImageView) convertView
                                                .findViewById(R.id.imageView_item_listview_state2);

                                convertView.setTag(mHolder);
                        } else {
                                mHolder = (ViewHolder) convertView.getTag();
                        }
                        // 从list集合中整理数据
                        String cityname = list.get(position).get("cityname");
                        String temp = list.get(position).get("tem1") + "℃/"
                                        + list.get(position).get("tem2") + "℃";
                        String stateDetailed = list.get(position).get("stateDetailed");
                        String windString = list.get(position).get("windDir") + "  "
                                        + list.get(position).get("windPower");
                        String humidity = list.get(position).get("humidity");

                        String state1 = list.get(position).get("state1");
                        String state2 = list.get(position).get("state2");

                        // 给获取到的天气数据赋值到item布局的指定控件中
                        mHolder.text_item_listview_cityname.setText(cityname);
                        mHolder.text_item_listview_temp.setText(temp);
                        mHolder.text_item_listview_stateDetailed.setText(stateDetailed);
                        mHolder.text_item_listview_wind.setText(windString);
                        mHolder.text_item_listview_humidity.setText(humidity);
                        // 如果天气数据中的state1和state2相同,则只保留一个imageView控件,隐藏另一个。
                        // 如果两个不同,则说明天气情况有转变。则两个ImageView都保留。
                        if (state1.equals(state2)) {
                                mHolder.imageView_item_listview_state1
                                                .setImageResource(getImageId(state1));
                                mHolder.imageView_item_listview_state2
                                                .setVisibility(View.INVISIBLE);
                        } else {
                                mHolder.imageView_item_listview_state1
                                                .setImageResource(getImageId(state1));
                                mHolder.imageView_item_listview_state2
                                                .setVisibility(View.VISIBLE);
                                mHolder.imageView_item_listview_state2
                                                .setImageResource(getImageId(state2));
                        }
                        return convertView;
                }
                // 将自定义item布局中的控件定义成ViewHolder的属性
                class ViewHolder {
                        private TextView text_item_listview_cityname;
                        private TextView text_item_listview_temp;
                        private TextView text_item_listview_stateDetailed;
                        private TextView text_item_listview_wind;
                        private TextView text_item_listview_humidity;
                        private ImageView imageView_item_listview_state1;
                        private ImageView imageView_item_listview_state2;
                }

                // 通过state1或state2的数据,组成图片名称,通过图片名称,找到在R.java文件生成的id。
                // 利用id可以通过ImageView的setImageResource()方法给ImageView控件加载图片。
                public int getImageId(String state1) {
                        Class<R.drawable> cls = R.drawable.class;
                        try {
                                return cls.getDeclaredField("b_" + state1).getInt(null);
                        } catch (Exception e) {
                                e.printStackTrace();
                                return R.drawable.b_nothing;
                        }
                }
        }
}
原文链接:https://www.f2er.com/xml/298780.html

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