「現在地に近い」チェックボックスと結果を表示するリストビューを備えた検索フィールドを持つアクティビティがあります。私は今、アクティビティのライフサイクルにあり、onSaveInstanceStateメソッドとonRestoreInstanceStateメソッドを実装しています。アクティビティが破棄されて元に戻ると、結果のリストビューは表示されなくなりましたが、onSaveInstanceStateに何も保存していないのに、検索ボックスのテキストとチェックボックスの状態が復元されます。なんで？何が「自動的に」保存され、onSaveInstanceStateに何を保存する必要がありますか？
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);
}
}