/** 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 queryCounty() {
countyList = weatherDB.loadCounty(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 = weatherDB.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");
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
isFromWeather = getIntent().getBooleanExtra("from_weather_activity", false);
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
if (sp.getBoolean("city_selected", false) && !isFromWeather) {
Intent intent = new Intent(this, Weather.class);
startActivity(intent);
finish();
return;
}
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.select_area);
titleText = (TextView) findViewById(R.id.title_text);
listView = (ListView) findViewById(R.id.list_view);
adapter =
new ArrayAdapter<String>(SelectArea.this, android.R.layout.simple_list_item_1, dataList);
listView.setAdapter(adapter);
weatherDB = WeatherDB.getInstance(this);
listView.setOnItemClickListener(
new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (currentLevel == LEVEL_PROVINCE) {
selectedProvince = provinceList.get(position);
queryCities();
} else if (currentLevel == LEVEL_CITY) {
selectedCity = cityList.get(position);
queryCounty();
} else if (currentLevel == LEVEL_COUNTY) {
String countyCode = countyList.get(position).getCountyCode();
String countyName = countyList.get(position).getCountyName();
Intent intent = new Intent(SelectArea.this, Weather.class);
intent.putExtra("county_code", countyCode);
intent.putExtra("county_name", countyName);
startActivity(intent);
finish();
}
}
});
queryProvinces(); // 加载省级数据
}