我有以下问题。我想保存一些TextView
的值,以便在重新调回Fragment
之后检索并显示它们(我使用replace()
方法切换Fragment
s )。我按照这个POST的建议,所以我的代码现在看起来像这样:
public class NumbersFragment extends Fragment {
private static final String LONGITUDE_SAVE = "longitudeSave";
private static final String LATITUDE_SAVE = "latitudeString";
public TextView tvLatitude;
public TextView tvLongitude;
public Button startButton;
public Button stopButton;
public NumbersFragment() {
setArguments(new Bundle());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.numbers_fragment, container, false);
tvLatitude = (TextView) rootView.findViewById(R.id.tv_latitude);
tvLongitude = (TextView) rootView.findViewById(R.id.tv_longitude);
startButton = (Button) rootView.findViewById(R.id.start_button);
stopButton = (Button) rootView.findViewById(R.id.stop_button);
refreshUI();
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getActivity().startService(new Intent(getActivity(), RecordService.class));
}
});
stopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getActivity().stopService(new Intent(getActivity(), RecordService.class));
}
});
//getActivity().setTitle(R.string.record);
LocalBroadcastManager.getInstance(getActivity().getApplicationContext()).registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
double latitude = intent.getDoubleExtra(RecordService.EXTRA_LATITUDE, 0);
double longitude = intent.getDoubleExtra(RecordService.EXTRA_LONGITUDE, 0);
//textView.setText("Lat: " + latitude + ", Lng: " + longitude);
//tvLocation.setText("Latitude" + Double.toString(latitude) + "Longitude" + Double.toString(longitude));
tvLongitude.setText("Longitude: " + Double.toString(longitude));
tvLatitude.setText("Latitude: " + Double.toString(latitude));
}
}, new IntentFilter(RecordService.ACTION_LOCATION_BROADCAST)
);
return rootView;
}
@Override
public void onPause() {
super.onPause();
String latitudeToSave = tvLatitude.getText().toString();
String longitudeToSave = tvLongitude.getText().toString();
getArguments().putString(LATITUDE_SAVE, latitudeToSave);
getArguments().putString(LONGITUDE_SAVE, longitudeToSave);
Log.d("onPause", latitudeToSave + " " + longitudeToSave);
}
@Override
public void onResume() {
super.onResume();
refreshUI();
}
public void refreshUI() {
Bundle mySavedInstanceState = getArguments();
String loadedLatitude = mySavedInstanceState.getString(LATITUDE_SAVE);
String loadedLongitude = mySavedInstanceState.getString(LONGITUDE_SAVE);
Log.d("refreshUI", loadedLatitude + " " + loadedLongitude);
tvLatitude.setText(loadedLatitude);
tvLongitude.setText(loadedLongitude);
}
}
问题是在调用返回Fragment
refreshUI方法后,loadedLatitude
和loadedLongitude
String
始终为null
。我做错了什么?
答案 0 :(得分:0)
将 Bundle savedInstanceState 传递给 refreshUI()方法
正确的代码: refreshUI(savedInstanceState);
在方法中接收并使用它:
refreshUI(Bundle a){ String loadedLatitude = a.getString(LATITUDE_SAVE)
这将有效