我有一个使用Fragments的应用。它在视图中有3个片段。最左边的片段是护理者列表。中间片段是另一个列表，它是一个看护者rota。
当加载主屏幕（包含所有3个片段的Activity）时，仅加载左片段。如果你选择一个看护人，则加载中间片段（rota）。
问题是用户可以从optionsMenu中选择next，previous等来为给定的护理者选择下一天或前一天的rota。如果当前没有显示rota（中间片段），我不希望optionsMenu显示下一个或上一个按钮。
每个rota都是从AsyncTask加载的。在onPostExecute中，我加载了carerdetailsFragment，它是rota。我已经覆盖了onPrepareOptionsMenu并在那里检查了是否显示了rota。在获得rota之后，我还从onPostExecute调用了invalidateOptionsMenu。
当仅显示左侧片段时，optionsMenu会首先隐藏按钮，但是当您获得旋转时，它不会更新选项菜单，直到您再次加载旋转。
为什么invalidateOptionsMenu第一次没有运行？
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/carefreebgscaled"
>
<fragment android:name="com.carefreegroup.rr3.carefreeoncall.CarerListFragment"
android:id="@+id/carerlist"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/carerdetailsinfofragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<!-- <fragment android:name="com.carefreegroup.rr3.carefreeoncall.CarerDetailsFragment" -->
<!-- android:id="@+id/carerdetails" -->
<!-- android:layout_weight="1" -->
<!-- android:layout_width="match_parent" -->
<!-- android:layout_height="match_parent" /> -->
<!-- <fragment android:name="com.carefreegroup.rr3.carefreeoncall.CarerPurposeOfCallFragment" -->
<!-- android:id="@+id/carerpurposeofcall" -->
<!-- android:layout_weight="1" -->
<!-- android:layout_width="match_parent" -->
<!-- android:layout_height="match_parent" /> -->
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/carerpurposeofcallfragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import com.carefreegroup.rr3.carefreeoncall.CarerListFragment.OnArticleSelectedListener;
import com.carefreegroup.rr3.carefreeoncall.RotaDatePicker.OnRotaDatePickerListener;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
public class OnCallListAndDetailsActivity extends Activity implements OnArticleSelectedListener, OnRotaDatePickerListener{
private static final String TAG = OnCallListAndDetailsActivity.class.getSimpleName();
RROnCallApplication rrOnCallApp;
String firstName;
String lastName;
Intent intent;
String carerIDUpdateRota;
String updatedRotaDate;
DateTime now;
String mCarerID;
String callStartTime;
String callDuration;
String callID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.oncalllistanddetailsactivitylayout);
rrOnCallApp = (RROnCallApplication) getApplication();
setTitle("Carer Update Call");
Cursor carers = rrOnCallApp.dbModel.queryAllFromCarer();
Log.e(TAG, "there are " + carers.getCount() + " in the carer table(OnCallListAndDetailsActivity)");
View CarerDeailsInfoFragContainer = (View)findViewById(R.id.carerdetailsinfofragment_container);
if ( CarerDeailsInfoFragContainer == null) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
intent = this.getIntent();
Log.e(TAG, "Action of intent = " + intent.getAction());
if (intent.getAction() != null && intent.getAction().equalsIgnoreCase("SHOW_UPDATED_ROTA")){
if ( CarerDeailsInfoFragContainer != null) {
carerIDUpdateRota = intent.getStringExtra("carerid");
updatedRotaDate = intent.getStringExtra("rotadate");
String[] params = new String[] { carerIDUpdateRota, updatedRotaDate };
AsyncGetRota agr = new AsyncGetRota();
agr.execute(params);
}else{
carerIDUpdateRota = intent.getStringExtra("carerid");
updatedRotaDate = intent.getStringExtra("rotadate");
Intent intent = new Intent(this, DisplayCarerDetailsfragmentActivity.class);
intent.putExtra("carerid", carerIDUpdateRota);
intent.putExtra("date", updatedRotaDate);
startActivity(intent);
}
}
}//end of onCreate
@Override
public void onArticleSelected(String carerId, String _carerFirstName, String _carerLastName, boolean longClick) {
// TODO Auto-generated method stub
Log.e(TAG, "in onArticleSelected!!");
mCarerID = carerId;
CarerPurposeOfCallFragment test = (CarerPurposeOfCallFragment) getFragmentManager().findFragmentById(R.id.carerpurposeofcallfragment_container);
if (test != null && test.isVisible()) {
Log.e(TAG, "CarerPurposeOfCallFragment is visible");
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.remove(test);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
else {
//do nothing
Log.e(TAG, "CarerPurposeOfCallFragment is not visible");
}
if(longClick == false){
CarerInfoFragment carerInfoFrag = new CarerInfoFragment();
if (carerInfoFrag != null && carerInfoFrag.isVisible()) {
Log.e(TAG, "CarerInfoFragment is visible");
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.remove(carerInfoFrag);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
now = new DateTime();
//now.minusDays(14);
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String formattedNow = fmt.print(now);
View CarerDetailsInfoFragContainer = (View)findViewById(R.id.carerdetailsinfofragment_container);
if ( CarerDetailsInfoFragContainer == null) {
Intent intent = new Intent(this, DisplayCarerDetailsfragmentActivity.class);
intent.putExtra("carerid", carerId);
intent.putExtra("date", formattedNow);
startActivity(intent);
} else {
// DisplayFragment (Fragment B) is in the layout (tablet layout),
// so tell the fragment to update
String[] params = new String[] { carerId, formattedNow };
AsyncGetRota agr = new AsyncGetRota();
agr.execute(params);
}
}else{
View CarerDetailsInfoFragContainer = (View)findViewById(R.id.carerdetailsinfofragment_container);
if ( CarerDetailsInfoFragContainer == null) {
Intent intent = new Intent(this, DisplayCarerInfofragmentActivity.class);
startActivity(intent);
}else{
Fragment newFragment = new CarerInfoFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.carerdetailsinfofragment_container, newFragment);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
}//end of onArticleSelected
private class AsyncGetRota extends AsyncTask<String, Void, TwoDimensionalArrayList<String>> {
TwoDimensionalArrayList rotaArray;
ProgressDialog progressDialog;
String carerID = null;
String date = null;
@Override
protected void onPreExecute() {
progressDialog = new ProgressDialog(OnCallListAndDetailsActivity.this);
progressDialog.setTitle("Connecting to Server");
progressDialog.setMessage("retrieving rota...");
progressDialog.setIndeterminate(true);
progressDialog.show();
}
@Override
protected TwoDimensionalArrayList<String> doInBackground(String... params) {
try {
carerID = params[0];
date = params[1];
Log.e(TAG, "now in doinbackground = " + params[1]);
rotaArray = rrOnCallApp.webService.getCarerRota(params[0], params[1]);
if (rotaArray == null) {
Log.e(TAG, "about to call onstart");
}
} catch (Exception e) {
e.printStackTrace();
}
return rotaArray;
}//end of doInBackground
@Override
protected void onPostExecute(TwoDimensionalArrayList<String> result) {
super.onPostExecute(result);
if (progressDialog != null)
progressDialog.dismiss();
if (result == null) {
Log.e(TAG, "rotaArray in onPostExecute OnCallListAndDetailsActivity = null");
} else {
Log.e(TAG, "rotaArray in onPostExecute OnCallListAndDetailsActivity has size " + rotaArray.size());
Bundle b = new Bundle();
b.putSerializable("rotaArray", rotaArray);
b.putString("carerid", carerID);
b.putString("date", date);
Fragment newFragment = new CarerDetailsFragment();
newFragment.setArguments(b);
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.carerdetailsinfofragment_container, newFragment);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
OnCallListAndDetailsActivity.this.invalidateOptionsMenu();
}
}//end of onPostExecute
}
// @Override
// public void onRotaButtonSelected(String action, String date, String carerid) {
//
// CarerPurposeOfCallFragment test = (CarerPurposeOfCallFragment) getFragmentManager().findFragmentById(R.id.carerpurposeofcallfragment_container);
// if (test != null && test.isVisible()) {
//
// Log.e(TAG, "CarerPurposeOfCallFragment is visible");
//
//
// FragmentTransaction transaction = getFragmentManager().beginTransaction();
//
// // Replace whatever is in the fragment_container view with this fragment,
// // and add the transaction to the back stack
// transaction.remove(test);
// //transaction.addToBackStack(null);
//
// // Commit the transaction
// transaction.commit();
// }
//
// if(action.equalsIgnoreCase("next")){
//
// Log.e(TAG, "next clicked and date passed in is " + date);
//
// now = now.plusDays(1);
//
// DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
// String formattedNow = fmt.print(now);
//
// getRota(formattedNow, carerid);
//
//
//
//
// }else if(action.equalsIgnoreCase("previous")){
//
// Log.e(TAG, "previous clicked");
//
// now = now.minusDays(1);
//
// DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
// String formattedNow = fmt.print(now);
//
// getRota(formattedNow, carerid);
//
// }else if(action.equalsIgnoreCase("pickday")){
//
// Log.e(TAG, "pickday clicked");
//
// loadDatePicker();
//
//
// }
//
// }//end of onRotaButtonSelected
public void getRota(String date, String carerid){
View CarerDetailsInfoFragContainer = (View)findViewById(R.id.carerdetailsinfofragment_container);
if ( CarerDetailsInfoFragContainer == null) {
Intent intent = new Intent(this, DisplayCarerDetailsfragmentActivity.class);
intent.putExtra("carerid", carerid);
intent.putExtra("date", date);
startActivity(intent);
} else {
// DisplayFragment (Fragment B) is in the layout (tablet layout),
// so tell the fragment to update
String[] params = new String[] { carerid, date };
AsyncGetRota agr = new AsyncGetRota();
agr.execute(params);
}
}//getRota
public void loadDatePicker(){
Fragment newFragment = new RotaDatePicker();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.carerdetailsinfofragment_container, newFragment);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
@Override
public void onRotaDateSelected(DateTime date) {
//set now so when the user clicks next/previous after pickDay has been pressed the datatime is remembered
//eg 24->25->29->28
//not 24->25->29->24
now = date;
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String formattedNow = fmt.print(date);
getRota(formattedNow, mCarerID);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.rotamenu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
CarerPurposeOfCallFragment test = (CarerPurposeOfCallFragment) getFragmentManager().findFragmentById(R.id.carerpurposeofcallfragment_container);
if (test != null && test.isVisible()) {
Log.e(TAG, "CarerPurposeOfCallFragment is visible");
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.remove(test);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
switch (item.getItemId()) {
case R.id.previous:
Log.e(TAG, "previous clicked");
if(now != null){
now = now.minusDays(1);
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String formattedNow = fmt.print(now);
getRota(formattedNow, mCarerID);
}else{
Log.e(TAG, "now is null");
}
return true;
case R.id.next:
Log.e(TAG, "next clicked");
if(now != null){
now = now.plusDays(1);
DateTimeFormatter fmt2 = DateTimeFormat.forPattern("d-MMM-Y");
String formattedNow2 = fmt2.print(now);
getRota(formattedNow2, mCarerID);
}else{
Log.e(TAG, "now is null");
}
return true;
case R.id.pickaday:
Log.e(TAG, "pickday clicked");
if(mCarerID != null){
loadDatePicker();
}
return true;
case R.id.updatecall2:
Log.e(TAG, "update call clicked");
if(mCarerID != null){
ContentValues cv = ((CarerDetailsFragment) getFragmentManager().findFragmentById(R.id.carerdetailsinfofragment_container)).getCallParams();
callStartTime = cv.getAsString("callstarttime");
callDuration = cv.getAsString("callduration");
callID = cv.getAsString("callid");
if(callStartTime == null || callDuration == null || callID == null){
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
// set title
alertDialogBuilder.setTitle("No Call Selected!");
// set dialog message
alertDialogBuilder
.setMessage(
"Please Select a call from the rota to update." )
.setCancelable(false)
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}else{
CarerListFragment carerListFrag = (CarerListFragment) getFragmentManager().findFragmentById(R.id.carerlist);
if (carerListFrag != null && carerListFrag.isVisible()) {
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String date = fmt.print(now);
Intent updateCall = new Intent(this, UpdateCallDateTimeAndCarerActivity.class);
updateCall.putExtra("callstarttime", callStartTime);
updateCall.putExtra("callid", callID);
updateCall.putExtra("callduration", callDuration);
updateCall.putExtra("carerid", mCarerID);
updateCall.putExtra("rotadate", date);
startActivity(updateCall);
}else{
Log.e(TAG, "must be on a phone!");
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String date = fmt.print(now);
Intent updateCallOnPhone = new Intent(this, UpdateCallDateTimeActivity.class);
updateCallOnPhone.putExtra("callstarttime", callStartTime);
updateCallOnPhone.putExtra("callid", callID);
updateCallOnPhone.putExtra("callduration", callDuration);
updateCallOnPhone.putExtra("carerid", mCarerID);
updateCallOnPhone.putExtra("rotadate", date);
startActivity(updateCallOnPhone);
}
}
}else{
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
// set title
alertDialogBuilder.setTitle("No Carer Selected!");
// set dialog message
alertDialogBuilder
.setMessage(
"Please Select a carer from the carer list." )
.setCancelable(false)
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
return true;
}
return super.onMenuItemSelected(featureId, item);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
CarerDetailsFragment test2 = (CarerDetailsFragment) getFragmentManager().findFragmentById(R.id.carerdetailsinfofragment_container);
if (test2 == null ) {
Log.e(TAG, "CarerDetailsFragment = not visible");
menu.getItem(0).setVisible(false);
menu.getItem(1).setVisible(false);
menu.getItem(2).setVisible(false);
}else{
Log.e(TAG, "CarerDetailsFragment = visible");
menu.getItem(0).setVisible(true);
menu.getItem(1).setVisible(true);
menu.getItem(2).setVisible(true);
}
// add your conditions here and change 0 with the R.id.moredetails item postion.
CarerPurposeOfCallFragment test = (CarerPurposeOfCallFragment) getFragmentManager().findFragmentById(R.id.carerpurposeofcallfragment_container);
if (test == null || ! test.isVisible()) {
menu.getItem(3).setVisible(false);
}else{
menu.getItem(3).setVisible(true);
}
return true;
}//end of onPrepareOptionsMenu
}//end of class
答案 0 :(得分：1)
解决
而不是从活动中的onPostExecute调用invalidateOptionsMenu，我打电话
getActivity().invalidateOptionsMenu();
在Fragment类中，我把它放在onActivityCreated（）;
中现在工作正常。
马特