Ich habe mit einem Problem in einer Notiz Anwendung gekämpft, die ich mit Hilfe einer Tutorial-Serie gebaut habe. Ich habe gerade einen Dialog erstellt, der es dem Benutzer erlaubt, die Kategorie einer Notiz zu ändern, aber die neue Kategorie ist verloren, wenn die Ausrichtung geändert wird. wie i onSavedInstance
überschreiben, indem Tutorial angewiesen, Informationen aus erster aber aus irgendeinem Grund zu speichern ist nicht Code unten gelöst:Handhabung Orientierungsänderung in android Studio
package com.workingprogess.notebook;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
public class NoteEditFragment extends Fragment {
private ImageButton noteCatButton;
private EditText title;
private EditText message;
private Button saveButton;
private Note.Category savedButtonCategory;
private AlertDialog categoryDialogObject;
private AlertDialog confirmDialogObject;
private static final String MODIFIED_CATEGORY="Modified Category";
public NoteEditFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if(savedInstanceState!=null){
savedButtonCategory = (Note.Category) savedInstanceState.get(MODIFIED_CATEGORY);
}
//grab layout and assign to view so that we may access widgets
View fragmentLayout = inflater.inflate(R.layout.fragment_note_edit, container, false);
//grab widget references
title = (EditText) fragmentLayout.findViewById(R.id.editNoteTitle);
message = (EditText) fragmentLayout.findViewById(R.id.editMessage);
noteCatButton = (ImageButton) fragmentLayout.findViewById(R.id.editNoteButton);
saveButton = (Button) fragmentLayout.findViewById(R.id.saveNoteButton);
//populate with note data
Intent intent = getActivity().getIntent();
title.setText(intent.getExtras().getString(MainActivity.NOTE_TITLE_EXTRA));
message.setText(intent.getExtras().getString(MainActivity.NOTE_MESSAGE_EXTRA));
if(savedButtonCategory !=null){
Log.d("not null","the new image should be carried over");
noteCatButton.setImageResource(Note.categoryToDrawable(savedButtonCategory));
} else {
Note.Category noteCat = (Note.Category) intent.getSerializableExtra(MainActivity.NOTE_CATEGORY_EXTRA);
savedButtonCategory = noteCat;
noteCatButton.setImageResource(Note.categoryToDrawable(noteCat));
Log.e("null","pull from intent");
}
//set onclick listeners
buildCategoryDialog();
noteCatButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
categoryDialogObject.show();
}
});
buildConfirmDialog();
saveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
confirmDialogObject.show();
}
});
// Inflate the layout for this fragment
return fragmentLayout;
}
//save info before orientation change.
@Override
public void onSaveInstanceState(Bundle savedInstanceState){
super.onSaveInstanceState(savedInstanceState);
Log.d("save","info is saved");
savedInstanceState.putSerializable(MODIFIED_CATEGORY, savedButtonCategory);
}
//build pop uo dialog to change note info
private void buildCategoryDialog(){
final String[] categories = new String[]{"Personal","Technical","Quote","Finance"};
final AlertDialog.Builder categoryBuilder = new AlertDialog.Builder(getActivity());
categoryBuilder.setTitle("Choose Note Type");
categoryBuilder.setSingleChoiceItems(categories, 0, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int item) {
switch (item){
case 0:
savedButtonCategory= Note.Category.PERSONAL;
noteCatButton.setImageResource(R.drawable.p_icon);
break;
case 1:
savedButtonCategory=Note.Category.TECHNICAL;
noteCatButton.setImageResource(R.drawable.t_icon);
break;
case 2:
savedButtonCategory=Note.Category.QUOTE;
noteCatButton.setImageResource(R.drawable.q_icon);
break;
case 3:
savedButtonCategory=Note.Category.FINANCE;
noteCatButton.setImageResource(R.drawable.f_icon);
break;
}
categoryDialogObject.cancel();
}
});
categoryDialogObject=categoryBuilder.create();
}
private void buildConfirmDialog(){
final AlertDialog.Builder confirmBuilder = new AlertDialog.Builder(getActivity());
confirmBuilder.setTitle("are you sure?");
confirmBuilder.setMessage("are you sure you want to save this note");
confirmBuilder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Log.d("Save Note","Note title " + title.getText()+ "Note message "
+ message.getText()+" note category" + savedButtonCategory);
Intent intent = new Intent(getActivity(),MainActivity.class);
startActivity(intent);
}
});
confirmBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
savedButtonCategory=Note.Category.TECHNICAL;
}
});
confirmDialogObject = confirmBuilder.create();
}
}
Versuchen Sie, (android: configChanges = "orientation | screenSize") in der Activity - Manifest-Datei hinzuzufügen, damit die Aktivität für die Orientierungsänderung nicht erneut ausgeführt wird - hier https://developer.android.com/guide/topics/ resources/runtime-changes.html – Tasos