2
"가까운 현재 위치"체크 박스가있는 검색 필드와리스트 뷰를 사용하여 결과를 보여주는 활동이 있습니다. onSaveInstanceState 및 onRestoreInstanceState 메소드를 구현하여 활동의 라이프 사이클에 있습니다. 액티비티가 파괴되어 다시 돌아 오면 결과가있는 목록보기가 사라지지만 onSaveInstanceState에 아무 것도 저장하지 않은 상태에서 검색 상자의 텍스트와 체크 박스 상태가 복원됩니다. 왜? "자동으로"저장되는 항목과 onSaveInstanceState에 저장해야하는 항목은 무엇입니까?간단한 안드로이드 애플리케이션의 라이프 사이클에 대한 또 다른 질문
public class Atable extends Activity {
private EditText mSearch;
private static final int ACTIVITY_EDIT=0;
private Button mSearchButton;
private TextView mNoresults;
private TextView mytext;
private ListView lv;
private CheckBox checkBox;
private LocationManager locationManager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lv= (ListView)findViewById(R.id.listview);
mNoresults = (TextView) findViewById(R.id.noresults);
mNoresults.setVisibility(View.GONE);
mSearchButton = (Button)this.findViewById(R.id.button);
checkBox = (CheckBox) findViewById(R.id.local_check);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
final Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
mSearchButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mNoresults.setVisibility(View.GONE);
mSearch = (EditText) findViewById(R.id.search);
String tmp_str = mSearch.getText().toString().replace(" ","+");
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
String url = "http://www.atable.org/getRestaurantByQuery/?query=" + tmp_str;
if (checkBox.isChecked()) {
//get location
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
if (location!=null) {
String lat = String.valueOf(location.getLatitude());
String lng = String.valueOf(location.getLongitude());
url += "&lat="+lat+"&lng="+lng;
}
}
HttpGet httpget = new HttpGet(url);
// Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
Reader r = new InputStreamReader(instream);
Gson gson = new Gson();
final RestaurantList restaurantList = gson.fromJson(r, RestaurantList.class);
int nResults = restaurantList.getSize();
if (nResults>0) {
lv.setVisibility(View.VISIBLE);
lv.setAdapter(new ArrayAdapter<String>(Atable.this ,android.R.layout.simple_list_item_1,restaurantList.getRestaurantNames()));
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(Atable.this, RestaurantDescription.class);
Restaurant tmp_resto = restaurantList.getRestaurant((int)id);
String tmp_categories = tmp_resto.getCategories().get(0);
for (int i=1; i<tmp_resto.getCategories().size(); i++) {
tmp_categories+=", "+tmp_resto.getCategories().get(i);
}
String address = tmp_resto.getStreet()+", "+tmp_resto.getStreetNumber()+"\n"+tmp_resto.getCity()+
" "+tmp_resto.getPostalCode()+"\n"+tmp_resto.getCountry();
intent.putExtra("name", tmp_resto.getName());
intent.putExtra("address", address);
intent.putExtra("rating", tmp_resto.getRating());
intent.putExtra("price_range", tmp_resto.getPriceRange());
intent.putExtra("categories", tmp_categories);
intent.putExtra("latitude", tmp_resto.getLatitude());
intent.putExtra("longitude", tmp_resto.getLongitude());
startActivityForResult(intent, ACTIVITY_EDIT);
}
});
}
else {
lv.setVisibility(View.GONE);
mNoresults.setVisibility(View.VISIBLE);
}
//Closing the input stream will trigger connection release
instream.close();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
//Start a location listener
LocationListener onLocationChange=new LocationListener() {
public void onLocationChanged(Location loc) {
//sets and displays the lat/long when a location is provided
/*String latlong = "Lat: " + loc.getLatitude() + " Long: " + loc.getLongitude();
mytext.setText(latlong);*/
}
public void onProviderDisabled(String provider) {
// required for interface, not used
}
public void onProviderEnabled(String provider) {
// required for interface, not used
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
// required for interface, not used
}
};
//pauses listener while app is inactive
@Override
public void onPause() {
super.onPause();
locationManager.removeUpdates(onLocationChange);
}
//reactivates listener when app is resumed
@Override
public void onResume() {
super.onResume();
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,onLocationChange);
}
@Override
protected void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Activity is getting killed", Toast.LENGTH_LONG).show();
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
Toast.makeText(this, "onRestoreInstanceState", Toast.LENGTH_LONG).show();
super.onRestoreInstanceState(savedInstanceState);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
Toast.makeText(this, "onSaveInstanceState", Toast.LENGTH_LONG).show();
super.onSaveInstanceState(outState);
}
}