Android Open Source - firstcodeandroid Choose Area Activity

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License

The source code is released under:
MIT License
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Java Source Code

package com.vjia.coolweather.activity;
/*from www  . j  a va  2s. c  o m*/
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.vjia.coolweather.R;
import com.vjia.coolweather.db.CoolWeatherDB;
import com.vjia.coolweather.model.City;
import com.vjia.coolweather.model.County;
import com.vjia.coolweather.model.Province;
import com.vjia.coolweather.util.HttpCallbackListener;
import com.vjia.coolweather.util.HttpUtil;
import com.vjia.coolweather.util.Utility;

public class ChooseAreaActivity extends Activity {

  public static final int LEVEL_PROVINCE = 0;
  public static final int LEVEL_CITY = 1;
  public static final int LEVEL_COUNTY = 2;

  private ProgressDialog progressDialog;
  private TextView titleText;
  private ListView listView;
  private ArrayAdapter<String> adapter;
  private CoolWeatherDB coolWeatherDB;
  private List<String> dataList = new ArrayList<String>();

  private List<Province> provinceList;
  private List<City> cityList;
  private List<County> countyList;
  private Province selectedProvince;
  private City selectedCity;
  /**
   * the current level selected.
   */
  private int currentLevel;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    // switch city
    // get the Intent that starts current Activity
    Intent intent1 = getIntent();
    boolean from_weather_activity = intent1.getBooleanExtra("from_weather_activity", false);
    
    // add logic to jump to WeatherActivity from ChooseAreaActivity
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    if(prefs.getBoolean("city_selected", false) && !from_weather_activity){
      Intent intent = new Intent(this, WeatherActivity.class);
      startActivity(intent);
      finish(); 
      return;
    }
    // end of - add logic to jump to WeatherActivity from ChooseAreaActivity
    
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.setContentView(R.layout.choose_area);
    listView = (ListView) this.findViewById(R.id.list_view);
    titleText = (TextView) this.findViewById(R.id.title_text);
    adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1, dataList);
    listView.setAdapter(adapter);
    coolWeatherDB = CoolWeatherDB.getInstance(this);
    listView.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> arg0, View view, int index,
          long arg3) {
        // TODO Auto-generated method stub
        if (currentLevel == LEVEL_PROVINCE) {
          selectedProvince = provinceList.get(index);
          queryCities();
        } else if (currentLevel == LEVEL_CITY) {
          selectedCity = cityList.get(index);
          queryCounties();
        } else if(currentLevel == LEVEL_COUNTY){
          String countyCode = countyList.get(index).getCountyCode();
          Intent intent = new Intent(ChooseAreaActivity.this, WeatherActivity.class);
          intent.putExtra("county_code", countyCode);
          startActivity(intent);
          finish();
        }
      }

    });
    queryProvinces();
  }

  private void queryProvinces() {
    // TODO Auto-generated method stub
    provinceList = coolWeatherDB.loadProvinces();
    if (provinceList.size() > 0) {
      dataList.clear();
      for (Province province : provinceList) {
        dataList.add(province.getProvinceName());
      }
      adapter.notifyDataSetChanged();
      listView.setSelection(0);
      titleText.setText("???");
      currentLevel = LEVEL_PROVINCE;

    } else {
      queryFromServer(null, "province");
    }
  }

  protected void queryCities() {
    // TODO Auto-generated method stub
    cityList = coolWeatherDB.loadCities(selectedProvince.getId());// event
                                    // after
                                    // listView.setSelection(0);
                                    // ?
    if (cityList.size() > 0) {
      dataList.clear();
      for (City city : cityList) {
        dataList.add(city.getCityName());
      }
      adapter.notifyDataSetChanged();
      listView.setSelection(0);
      titleText.setText(selectedProvince.getProvinceName());
      currentLevel = this.LEVEL_CITY;
    } else {
      queryFromServer(selectedProvince.getProvinceCode(), "city");
    }

  }

  protected void queryCounties() {
    // TODO Auto-generated method stub
    countyList = coolWeatherDB.loadCounties(selectedCity.getId());
    if (countyList.size() > 0) {
      dataList.clear();
      for (County county : countyList) {
        dataList.add(county.getCountyName());
      }
      adapter.notifyDataSetChanged();
      listView.setSelection(0);
      titleText.setText(selectedCity.getCityName());
      currentLevel = this.LEVEL_COUNTY;
    } else {
      queryFromServer(selectedCity.getCityCode(), "county");
    }
  }

  /**
   * ????????????/???????????????
   * 
   * @param code
   * @param type
   */
  private void queryFromServer(final String code, final String type) {
    String address;
    if (!TextUtils.isEmpty(code)) {
      address = "http://www.weather.com.cn/data/list3/city" + code
          + ".xml";
    } else {
      address = "http://www.weather.com.cn/data/list3/city.xml";
    }
    showProgressDialog();
    HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {

      @Override
      public void onFinish(String response) {
        // TODO Auto-generated method stub
        boolean result = false;
        if ("province".equals(type)) {
          result = Utility.handleProvincesResponse(coolWeatherDB,
              response);
        } else if ("city".equals(type)) {
          result = Utility.handleCitiesResponse(coolWeatherDB,
              response, selectedProvince.getId());
        } else if ("county".equals(type)) {
          result = Utility.handleCountriesResponse(coolWeatherDB,
              response, selectedCity.getId());
        }

        if (result) {
          // void android.app.Activity.runOnUiThread(Runnable action)
          // ???runOnUiThread()??????????????????
          runOnUiThread(new Runnable() {

            @Override
            public void run() {
              // TODO Auto-generated method stub
              closeProgressDialog();
              if ("province".equals(type)) {
                queryProvinces();
              } else if ("city".equals(type)) {
                queryCities();
              } else if ("county".equals(type)) {
                queryCounties();
              }
            }

          });
        }
      }

      @Override
      public void onError(Exception e) {
        // TODO Auto-generated method stub
        // ???runOnUriThread()??????????????????
        runOnUiThread(new Runnable() {

          @Override
          public void run() {
            // TODO Auto-generated method stub
            closeProgressDialog();
            Toast.makeText(ChooseAreaActivity.this, "???????",
                Toast.LENGTH_SHORT).show();
          }
        });

      }

    });
  }

  private void showProgressDialog() {
    if (progressDialog == null) {
      progressDialog = new ProgressDialog(this);
      progressDialog.setMessage("???????.....");
      progressDialog.setCanceledOnTouchOutside(false);
    }
    progressDialog.show();
  }

  private void closeProgressDialog() {
    if (progressDialog != null) {
      progressDialog.dismiss();
    }
  }

  /**
   * ????Back????????????????????????????????????/????/????????????
   */
  @Override
  public void onBackPressed() {
    // TODO Auto-generated method stub
    // super.onBackPressed();
    if (currentLevel == this.LEVEL_COUNTY) {
      queryCities();
    } else if (currentLevel == this.LEVEL_CITY) {
      queryProvinces();
    } else {
      // void android.app.Activity.finish()
      finish();
    }
  }

}
Java Source Code List
