/** 查询全国所有的省，优先从数据库查询，如果没有查询到再去服务器上查询。 */
private void queryProvinces() {
provinceList = coolWeatherDB.loadProvinces();
if (provinceList.size() > 0) {
dataList.clear();
for (Province province : provinceList) {
dataList.add(province.getProvinceName());
}
adapter.notifyDataSetChanged();
listView.setSelection(0);
titleText.setText("中国");
currentLevel = LEVEL_PROVINCE;
} else {
queryFromServer(null, "province");
}
}
/** 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询。 */
private void queryCounties() {
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 = LEVEL_COUNTY;
} else {
queryFromServer(selectedCity.getCityCode(), "county");
}
}
/** 查询所有的市，优先从数据库查询，如果没有就从服务器查询 */
private void queryCities() {
cityList = coolWeatherDB.loadCities(selectedProvince.getId());
if (cityList.size() > 0) {
dataList.clear();
for (City c : cityList) {
dataList.add(c.getCityName());
}
adapter.notifyDataSetChanged();
list_view.setSelection(0);
title_text.setText(selectedProvince.getProvinceName());
currentLevel = LEVEL_CITY;
} else {
queryFromServer(selectedProvince.getProvinceCode(), "city");
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
isFromWeatherActivity = getIntent().getBooleanExtra("from_weather_activity", false);
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
// 已经选择了城市且不是从WeatherActivity跳转过来，才会直接跳转到 WeatherActivity
if (prefs.getBoolean("city_selected", false) && !isFromWeatherActivity) {
Intent intent = new Intent(this, WeatherActivity.class);
startActivity(intent);
finish();
return;
}
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.choose_area);
listView = (ListView) findViewById(R.id.list_view);
titleText = (TextView) 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) {
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(); // 加载省级数据
}