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, 0, 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>> list = null; 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>>(); break; case 2: if (nodeName.equals("city")) { map = new HashMap<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文件中生成的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; } } }} 0 0
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