Android onsaveinstancestate الاستخدام
https://stackoverflow.com/questions/1954689
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21-09-2019 - |
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يرجى توجيه في الفصل التالي ما يجب أن أحفظه.
يرجى تذكر أنني أستخدم سلسلة واحدة فقط وهي أعيد إعادة تشغيلها من طريقة GetExtra ولا يوجد شيء أعتقد أنه يجب علي تخزينه بالطريقة المتجاوز التالية.
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
}
هل يمكنك إرشادني ما يجب تخزينه في طريقة مثيل OnSave وما لا؟
package com.wozzon.activity;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.text.Html;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import com.wozzon.json.JSONService;
import com.wozzon.model.SearchCriteria;
import com.wozzon.pl.UIFactory;
import com.wozzon.util.Util;
import com.wozzon.util.WLConstants;
public class HomeBrowse extends Activity implements OnItemClickListener{
private final static String TAG = HomeBrowse.class.getSimpleName();
private ArrayList<BrowseRow> model=new ArrayList<BrowseRow>();
private BrowseAdapter adapter;
private ListView list;
private TextView browseTitle;
private TextView changeLink;
private SearchCriteria sc =SearchCriteria.getInstance();
private JSONArray jsonArray;
private ProgressDialog m_ProgressDialog = null;
private Runnable progressRunnable;
@Override
public void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.browse);
String errorMsg =Util.getExtraValue(getIntent().getExtras(), WLConstants.ERROR_MSG);
list =(ListView)findViewById(R.id.browse_cats);
if(errorMsg!= null){
UIFactory.displayAlert(new AlertDialog.Builder(HomeBrowse.this), "Status", errorMsg);
}
progressRunnable = new Runnable(){
@Override
public void run() {
try {
loadData();
} catch (Throwable e) {
Log.e(TAG, e.getMessage());
}
runOnUiThread(returnRes);
}
};
m_ProgressDialog = ProgressDialog.show(HomeBrowse.this,
"Please wait...", "Loading ...", true);
Thread thread = new Thread(progressRunnable);
thread.start();
} catch (Throwable e) {
Log.e(TAG, e.getMessage());
Util.handleError(HomeBrowse.this, HomeBrowse.class, e.getMessage());
//UIFactory.displayAlert(new AlertDialog.Builder(HomeBrowse.this), "Error Loading categories", e.getMessage());
}
}
private void loadData()throws Throwable{//loading object
jsonArray = JSONService.getJsonArray(getResources().getString(R.string.catJson));
}
private void fillResultRows(JSONArray jsonArray, BrowseAdapter adapter)throws Throwable{
BrowseRow br = null;
try {
for(int a=0; a<jsonArray.length(); a++){
JSONObject jsonObj = jsonArray.getJSONObject(a);
br = new BrowseRow();
br.name=jsonObj.getString("title");
br.image=jsonObj.getString("image");
br.searchType = jsonObj.getInt("searchType");
if(jsonObj.has("categoryIds")){
br.categoryIds = jsonObj.getString("categoryIds").replaceAll("-", ",");
}
if(jsonObj.has("subCategoryIds")){
br.subCategoryIds = jsonObj.getString("subCategoryIds").replaceAll("-", ",");
}
adapter.add(br);
}
} catch (Throwable e) {
throw e;
}
}
class BrowseAdapter extends ArrayAdapter<BrowseRow> {
BrowseAdapter() {
super(HomeBrowse.this, android.R.layout.simple_list_item_1, model);
}
public View getView(int position, View convertView,
ViewGroup parent) {
View row=convertView;
ResultWrapper wrapper=null;
if (row==null) {
LayoutInflater inflater=getLayoutInflater();
row=inflater.inflate(R.layout.browse_row, null);
wrapper=new ResultWrapper(row);
row.setTag(wrapper);
}
else {
wrapper=(ResultWrapper)row.getTag();
}
wrapper.populateFrom(model.get(position));
return(row);
}
}
class ResultWrapper {
private TextView name;
private String catIds="0";
private String subCatIds="0";
private ImageView image;
private int searchType;
private View row=null;
ResultWrapper(View row) {
this.row=row;
}
void populateFrom(BrowseRow r) {
getName().setText(r.name);
getIcon().setImageResource(getImageIcon(Integer.parseInt(r.image)));
catIds =r.categoryIds;
subCatIds = r.subCategoryIds;
searchType =r.searchType;
}
TextView getName() {
if (name==null) {
name=(TextView)row.findViewById(R.id.browse_row_name);
}
return name;
}
ImageView getIcon() {
if (image==null) {
image=(ImageView)row.findViewById(R.id.browse_row_icon);
}
return image;
}
}
private int getImageIcon(int catId){
int imageSource=R.drawable.all_cats;
switch(catId){
case WLConstants.CATEGORY_FILM: imageSource =R.drawable.film; break;
case WLConstants.CATEGORY_MUSIC: imageSource =R.drawable.music; break;
case WLConstants.CATEGORY_ARTS: imageSource =R.drawable.art; break;
case WLConstants.CATEGORY_KIDS: imageSource =R.drawable.museum; break;
case WLConstants.CATEGORY_GALLERY_MUSEUM: imageSource =R.drawable.kids; break;
case WLConstants.CATEGORY_COMEDY: imageSource =R.drawable.comedy; break;
case WLConstants.CATEGORY_NIGHT_CLUBS: imageSource =R.drawable.clubs; break;
case WLConstants.CATEGORY_ATTRACTION: imageSource =R.drawable.touristattractions; break;
case WLConstants.CATEGORY_VARIOUS_EVENTS: imageSource =R.drawable.all_cats; break;
case WLConstants.CATEGORY_ALL_FOOD_DRINK: imageSource =R.drawable.restaurants; break;
}
return imageSource;
}
@Override
public void onItemClick(AdapterView<?> adp, View view, int item, long arg3) {
try {
if("".equals(sc.getSearchLocation()) && (!(Util.locationFound(sc.getGeoLocation()) && sc.isUK()))){
UIFactory.displayAlert(new AlertDialog.Builder(HomeBrowse.this), "Error", "Please provide location");
return;
}
ResultWrapper wrap = (ResultWrapper)view.getTag();
sc.setCategoryIds(wrap.catIds);
sc.setSubCategoryIds(wrap.subCatIds);
sc.setSearchType(wrap.searchType);
goSearch();
} catch (Throwable e) {
Log.e(TAG, e.getMessage());
Util.handleError(HomeBrowse.this, HomeBrowse.class, e.getMessage());
//UIFactory.displayAlert(new AlertDialog.Builder(this), "Error", e.getMessage());
}
}
private void applyListener(){
list.setOnItemClickListener(this);
changeLink.setOnClickListener(onclickListener);
}
private final void goSearch(){
try {
sc.setSearchString("");
Intent mainIntent = new Intent(HomeBrowse.this,SearchResults.class);
startActivity(mainIntent);
} catch (Throwable e) {
Log.e(TAG, e.getMessage());
Util.handleError(HomeBrowse.this, HomeBrowse.class, e.getMessage());
}
}
public OnClickListener onclickListener = new OnClickListener(){
// @Override
public void onClick(View aView) {
try {
int componentId =aView.getId();
switch(componentId){
case R.id.tv_changeDateType:
Intent intent = new Intent(HomeBrowse.this,TimeLocationSettings.class);
startActivity(intent);
break;
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
Util.handleError(HomeBrowse.this, HomeBrowse.class, e.getMessage());
}
}
};
private void configComponents(){
String titleStr,location = "";
String dateCrtStr = Util.getDateCritieraStr(sc.getDateCriteria());
titleStr= dateCrtStr;
if(!"".equals(sc.getSearchLocation())){
location = sc.getSearchLocation();
}else if(sc.isNearMe()){
location="Near me";
}else{
location = "Postcode or town";
}
titleStr = titleStr + " - "+ location;
browseTitle.setText(titleStr);
changeLink.setTypeface(Typeface.DEFAULT, Typeface.BOLD);
}
public class BrowseRow {
private String name = "";
private String image = "";
private String categoryIds="0";
private String subCategoryIds="0";
private int searchType=1;
}
private Runnable returnRes = new Runnable() {
@Override
public void run() {
try {
browseTitle = (TextView)findViewById(R.id.browsePageTite);
changeLink = (TextView)findViewById(R.id.tv_changeDateType);
changeLink.setText(Html.fromHtml("<a href='#'>Change</a>"));
adapter=new BrowseAdapter();
applyListener();
configComponents();
fillResultRows(jsonArray, adapter);
if(jsonArray == null){
UIFactory.displayAlert(new AlertDialog.Builder(HomeBrowse.this), "Error", "Error Loading categories");
return;
}
list.setAdapter(adapter);
} catch (Throwable e) {
e.printStackTrace();
}
m_ProgressDialog.dismiss();
}
};
}
المحلول
يجب أن تنقذ كل ما يصف حالة العرض التي لم يتم حفظها في مكان آخر.
احفظ مكان وجود المستخدم في EditText ، ما هي القيمة التي يتمتع بها EditText ، وما هو مربع الحوار حاليًا ، وما إلى ذلك. التطبيق والعودة إليه.
نصائح أخرى
ليس بالضرورة كل شيء ، لأن
يهتم التنفيذ الافتراضي بمعظم حالة واجهة المستخدم الخاصة بك من خلال استدعاء onsaveinstancestate () في كل عرض في التسلسل الهرمي الذي يحتوي التنفيذ الافتراضي لـ onrestoreinstancestate (حزمة)).
ولكن إذا تجاوزت ، فيجب عليك التعامل مع الحالة بأكملها بنفسك.
لا تنتمي إلى StackOverflow
