为什么导航列表返回到位置0？
问题描述：
我有这个片段活动，它使用其操作栏中的下拉导航列表。根据选择的选项，它显示服务器中的元素列表或调用其他活动（到目前为止，它显示“其他活动”的油葫芦）。为什么导航列表返回到位置0？
事情是，我发现如果我选择说选项2（第一个选项将为0），等待列表加载，然后旋转设备，导航列表返回到位置0（并加载了0选项列表）。我必须保存该选项，以便在旋转设备时，它仍会显示我选择的列表，但无论如何，导航列表都会返回到选项0。如果我现在重新旋转设备，它会加载0选项列表（因为它是那个时刻的选择）。
我的类从这个
public class TapabookListNavigationalActivity extends TapabookBaseActivity
implements OnNavigationListener {
protected Boolean esUnTablet = true;
protected Fragment fragment1;
protected Fragment fragment2;
protected ActionBar bar;
protected ActionBarDropDownAdapter dda;
public static final int ID_TAPAS_RECIENTES = 0;
public static final int ID_BUSCA_TAPA_MUNICIPIO = 1;
public static final int ID_BUSCA_TAPA_PROVINCIA = 2;
public static final int ID_BUSCA_TAPA= 3;
public static final int ID_BUSCA_BAR = 4;
public static final int ID_SUBE_TAPA= 5;
protected ArrayList<ActionBarMenuItem> opciones;
protected Dao mDao;
//protected static int ID_NAVIGATIONAL_THIS = 0;
public Dao getDao(){
return mDao;
}
@Override
protected void checkUserToken() {
if(ConfiguracionApp.getInstance().getTokenUsuario().equalsIgnoreCase("")){
// no hay token
Intent intent = new Intent(this, EntryFA.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getSupportMenuInflater();
menuInflater.inflate(R.menu.menu, menu);
// Calling super after populating the menu is necessary here to ensure that the
// action bar helpers have a chance to handle this event.
return super.onCreateOptionsMenu(menu);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// si no está logado, que vuelva al login
checkUserToken();
bar = getSupportActionBar();
loadNavigationList(Tapabook.getProvincia(),Tapabook.getMunicipio());
}
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
boolean handled = true;
Tapabook.d("TapabookListNavigationalActivity onNavigationItemSelected : " + itemId);
Intent intent = new Intent(this, TapaListFA.class);
if(itemPosition == ID_TAPAS_RECIENTES ||
itemPosition == ID_BUSCA_TAPA_MUNICIPIO ||
itemPosition == ID_BUSCA_TAPA_PROVINCIA ||
itemPosition == ID_BUSCA_TAPA){
croutonInfo("ID_TAPAS_RECIENTES");
intent.putExtra(TapaListFA.TYPE_LIST,ID_TAPAS_RECIENTES);
}else if(itemPosition == ID_BUSCA_BAR){
croutonInfo("ID_BUSCA_BAR");
}else if(itemPosition == ID_SUBE_TAPA){
croutonInfo("ID_SUBE_TAPA");
}else{
handled = false;
}
return handled;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int itemId = item.getItemId();
if (itemId == R.id.menu_item_acerca_de){
}else if (itemId == R.id.menu_item_enviar_email){
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.setData(Uri.parse(Tapabook.MAILTO));
intent.putExtra(android.content.Intent.EXTRA_SUBJECT, Tapabook.SUBJECT);
startActivity(intent);
}else if (itemId == R.id.menu_item_privacidad){
FragmentManager fm = getSupportFragmentManager();
PrivacyDF pdf = new PrivacyDF();
pdf.show(fm, "fragment_privacy");
}
return false;
}
@Override
public void onGeolocalizador(String direccion, String provincia,
String municipio, String region, float precisionMetros) {
super.onGeolocalizador(direccion, provincia, municipio, region, precisionMetros);
loadNavigationList(provincia,municipio);
}
protected void loadNavigationList(String provincia,String municipio){
opciones = new ArrayList<ActionBarMenuItem>();
opciones.add(
new ActionBarMenuItem(
ID_TAPAS_RECIENTES,
//R.drawable.ic_menu_buscar_bar,
getString(R.string.menu_nav_ver_últimas_tapas)
));
opciones.add(
new ActionBarMenuItem(
ID_BUSCA_TAPA_MUNICIPIO,
//R.drawable.ic_menu_buscar_tapa,
getString(R.string.menu_nav_ver_tapas_municipio)
+ " " + municipio
));
Tapabook.d("ActionBarMenuItem Municipio " + municipio);
opciones.add(
new ActionBarMenuItem(
ID_BUSCA_TAPA_PROVINCIA,
//R.drawable.ic_menu_buscar_tapa,
getString(R.string.menu_nav_ver_tapas_provincia).replace("%%%", provincia)
//+ " " + provincia
));
Tapabook.d("ActionBarMenuItem Provincia " + provincia);
opciones.add(
new ActionBarMenuItem(
ID_BUSCA_TAPA,
//R.drawable.ic_menu_buscar_tapa,
getString(R.string.menu_nav_buscar_tapas)
));
opciones.add(
new ActionBarMenuItem(
ID_BUSCA_BAR,
//R.drawable.ic_menu_subir_tapa,
getString(R.string.menu_nav_buscar_bares)
));
opciones.add(
new ActionBarMenuItem(
ID_SUBE_TAPA,
//R.drawable.ic_menu_subir_tapa,
getString(R.string.menu_nav_subir_tapa)
));
dda
= new ActionBarDropDownAdapter(
this,
R.layout.actionbar_menu_item,
opciones);
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
bar.setListNavigationCallbacks(dda, this);
}
}
延伸，这是一个显示列表中的类
public class TapaListFA extends TapabookListNavigationalActivity {
public static final String TYPE_LIST ="list_type";
public static final String LIST_LOADED ="list_loaded";
public static final String NAVIGATION_POINT ="navigation_point";
private static boolean loadedList = false;
private static int navigationPoint = -1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tapa_list);
Bundle extras= getIntent().getExtras();
int listType = extras.getInt(TYPE_LIST);
//
Tapabook.d("pre-prepareList >> " + listType);
if(!loadedList){
Tapabook.d("TapaListFA.onCreate loadedList not loaded, load list");
if(navigationPoint>=0){
Tapabook.d("TapaListFA.onCreate navPoint: " + navigationPoint);
setNavigationPoint(navigationPoint);
//prepareList(navigationPoint);
}else{
Tapabook.d("TapaListFA.onCreate listType: " + listType);
setNavigationPoint(listType);
//prepareList(listType);
}
loadedList = true;
}
Tapabook.d("TapaListFA.onCreate fin");
}
public void prepareList(int type){
Tapabook.d("TapaListFA.prepareList: " + type);
ListaTapasParametros ltparam = new ListaTapasParametros();
ltparam.setPagina(0);
switch (type){
case ID_BUSCA_TAPA_MUNICIPIO:
ltparam.setProvincia(Tapabook.getProvincia());
break;
case ID_BUSCA_TAPA_PROVINCIA:
ltparam.setProvincia(Tapabook.getMunicipio());
break;
case ID_BUSCA_TAPA:
croutonInfo("Buscador");
break;
case ID_TAPAS_RECIENTES:
break;
default:
Tapabook.wtf("¿qué tipo está entrando? " + type);
}
Tapabook.d("TapaListFA.prepareList: showTapaList" + type);
showTapaList(type, ltparam);
}
private void showTapaList(int typeOfList, ListaTapasParametros params) {
Tapabook.d("TapaListFA.showTapaList" + typeOfList);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
TapaListFragment tlf = new TapaListFragment();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
ft.replace(R.id.tla_container, tlf);
ft.addToBackStack(null);
Bundle args = new Bundle();
args.putInt(TYPE_LIST, typeOfList);
// Commit the transaction
tlf.setRetainInstance(true);
ft.commitAllowingStateLoss();
tlf.setArguments(args);
tlf.loadTapaList(typeOfList, params, 0);
Tapabook.d("TapaListFA.showTapaList fin " + typeOfList);
}
public void startSearch(ListaTapasParametros params){
showTapaList(ID_BUSCA_TAPA, params);
}
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
boolean handled = true;
Intent intent;
Tapabook.d("TapaListFA.onNavigationItemSelected : " + itemId);
if(itemId == ID_TAPAS_RECIENTES || itemId == ID_BUSCA_TAPA_MUNICIPIO
|| itemId == ID_BUSCA_TAPA_PROVINCIA){
if(navigationPoint >= itemPosition){
Tapabook.d("TapaListFA.onNavigationItemSelected prepareList navigationPoint : " + navigationPoint);
prepareList(navigationPoint);
}else{
Tapabook.d("TapaListFA.onNavigationItemSelected prepareList itemPosition: " + itemPosition);
prepareList(itemPosition);
}
}else if (itemId == ID_BUSCA_TAPA){
FragmentManager fm = getSupportFragmentManager();
TapaSearchDF tsdf = new TapaSearchDF();
tsdf.setRetainInstance(true);
tsdf.show(fm, "tapa_search_fragment");
}else if(itemId == ID_BUSCA_BAR || itemId == ID_SUBE_TAPA){
croutonInfo("ID_BUSCA_BAR/ID_SUBE_TAPA");
Tapabook.d("TapaListFA.onNavigationItemSelected buscabar/subetapa : " + itemId);
super.onNavigationItemSelected(itemPosition, itemId);
}else{
handled = false;
Tapabook.d("TapaListFA.onNavigationItemSelected (unhandled) : " + itemId);
}
navigationPoint = (int) itemId;
return handled;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Tapabook.d("TapaListFA.onSaveInstanceState loadedList=" + loadedList);
outState.putBoolean(LIST_LOADED,loadedList);
navigationPoint = bar.getSelectedNavigationIndex();
Tapabook.d("TapaListFA.onRestoreInstanceState navigationPoint=" + navigationPoint);
outState.putInt(NAVIGATION_POINT, navigationPoint);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
loadedList = savedInstanceState.getBoolean(LIST_LOADED);
Tapabook.d("TapaListFA.onRestoreInstanceState loadedList=" + loadedList);
navigationPoint = savedInstanceState.getInt(NAVIGATION_POINT);
Tapabook.d("TapaListFA.onRestoreInstanceState navigationPoint=" + navigationPoint);
setNavigationPoint(navigationPoint);
}
private void setNavigationPoint(int navPoint) {
Tapabook.d("TapaListFA.setNavigationPoint navPoint: " + navPoint);
if(navPoint>=0){
bar.setSelectedNavigationItem(navPoint);
navigationPoint = navPoint;
}else
Tapabook.w("TapaListFA.setNavigationPoint navPoint: " + navPoint);
}
}
这是logcat的当活动开始
02-24 11:37:23.491: D/TAPABOOK(31943): activities.TapaListFA.onCreate
02-24 11:37:23.511: D/TAPABOOK(31943): TapaListFA.onCreate loadedList not loaded, load list
02-24 11:37:23.511: D/TAPABOOK(31943): TapaListFA.onCreate listType: 0
02-24 11:37:23.511: D/TAPABOOK(31943): TapaListFA.setNavigationPoint navPoint: 0
02-24 11:37:23.511: D/TAPABOOK(31943): TapaListFA.onCreate fin
02-24 11:37:23.511: D/TAPABOOK(31943): activities.TapaListFA.onStart
02-24 11:37:23.511: D/TAPABOOK(31943): activities.TapaListFA.onResume
02-24 11:37:24.182: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 0
02-24 11:37:24.182: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList navigationPoint : 0
02-24 11:37:24.182: D/TAPABOOK(31943): TapaListFA.prepareList: 0
02-24 11:37:24.182: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList0
02-24 11:37:24.182: D/TAPABOOK(31943): TapaListFA.showTapaList0
02-24 11:37:24.212: D/TAPABOOK(31943): TapaListFA.showTapaList fin 0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList navigationPoint : 0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.prepareList: 0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.showTapaList0
02-24 11:37:24.882: D/TAPABOOK(31943): TapaListFA.showTapaList fin 0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList navigationPoint : 0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.prepareList: 0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.showTapaList0
02-24 11:37:24.923: D/TAPABOOK(31943): TapaListFA.showTapaList fin 0
这里我选择选项1中的下拉菜单
02-24 11:38:04.234: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 1
02-24 11:38:04.234: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList itemPosition: 1
02-24 11:38:04.234: D/TAPABOOK(31943): TapaListFA.prepareList: 1
02-24 11:38:04.234: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList1
02-24 11:38:04.244: D/TAPABOOK(31943): TapaListFA.showTapaList1
02-24 11:38:04.244: D/TAPABOOK(31943): TapaListFA.showTapaList fin 1
现在我旋转设备。它显示正确的清单，但下拉菜单回到选项0
02-24 11:38:25.838: D/TAPABOOK(31943): activities.TapaListFA.onPause
02-24 11:38:25.838: D/TAPABOOK(31943): TapaListFA.onSaveInstanceState loadedList=true
02-24 11:38:25.838: D/TAPABOOK(31943): TapaListFA.onRestoreInstanceState navigationPoint=1
02-24 11:38:25.848: D/TAPABOOK(31943): activities.TapaListFA.onStop
02-24 11:38:25.888: D/TAPABOOK(31943): activities.TapaListFA.onCreate
02-24 11:38:25.948: D/TAPABOOK(31943): TapaListFA.onCreate fin
02-24 11:38:25.968: D/TAPABOOK(31943): activities.TapaListFA.onStart
02-24 11:38:25.968: D/TAPABOOK(31943): TapaListFA.onRestoreInstanceState loadedList=true
02-24 11:38:25.968: D/TAPABOOK(31943): TapaListFA.onRestoreInstanceState navigationPoint=1
02-24 11:38:25.968: D/TAPABOOK(31943): TapaListFA.setNavigationPoint navPoint: 1
02-24 11:38:25.968: D/TAPABOOK(31943): activities.TapaListFA.onResume
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 1
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList navigationPoint : 1
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.prepareList: 1
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList1
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.showTapaList1
02-24 11:38:26.028: D/TAPABOOK(31943): TapaListFA.showTapaList fin 1
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected : 0
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.onNavigationItemSelected prepareList navigationPoint : 1
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.prepareList: 1
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.prepareList: showTapaList1
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.showTapaList1
02-24 11:38:26.358: D/TAPABOOK(31943): TapaListFA.showTapaList fin 1
为什么它会一直回到选项0？
答
看看这个：
除非你指定，配置变化（如屏幕方向，语言，输入设备等的变化 ）将导致破坏你的 当前活动，正在经历正常活动 生命周期过程
在某些特殊情况下，您可能希望基于一种或多种类型的配置更改，绕过重新启动您的 活动。这是在其清单中使用android:configChanges属性完成的 。对于任何 类型的配置更改，您说您在那里处理，您将 接收到对当前活动的 onConfigurationChanged(Configuration)方法的调用，而不是正在重新启动 。但是，如果配置更改涉及任何不是 句柄，则该活动仍会重新启动，并且不会调用 onConfigurationChanged(Configuration)。
'loadedList'被声明为false，并且看起来它在'onCreate（）'之后永远不会被修改。 – 2013-02-24 10:47:18
我将'loadedList = true'从'onCreate'改为'showTapaList'方法的末尾（以确保它在每次加载新列表时都会更改），但问题仍然存在...... – Frank 2013-02-24 11:54:28