I'm writing a flash card app in Android, and I tried to add the ability to add a word to a review list by having a checkbox. When the user goes to the next word, I see whether the checkbox is checked. If it is, I add the word to the review list, and if it isn't, I remove the word. When I tested it on my phone and the emulator, I got a forced close every time I try to go to the next word or to the home page when the checkbox is checked. I don't know what's causing the error because in the LogCat page, it doesn't show the line number or what error happened.
I can flip through the words without a problem when I don't have them checked; checking it and going to another word is what causes a problem, so I'm guessing it has to do with the SharedPreferences.
Here are the important methods I have:
public void onCreate(Bundle savedInstanceState)
{
//other code
reviewCheckBox = (CheckBox) findViewById(R.id.reviewCheckBox);
prefs = getPreferences(MODE_PRIVATE);
editor = prefs.edit();
reviewCards = prefs.getAll().keySet();
}
public void home(View v)
{
if (flashCardPage.getVisibility() == View.VISIBLE)
{
if (reviewCheckBox.isChecked())
reviewCards.add(currentCard.getTerm());
else
reviewCards.remove(currentCard.getTerm());
updateReviewCards();
}
//other code
}
public void nextWord(View v)
{
currentPosition++;
if (currentPosition == flashCards.size())
{
home(wordTV);
}
else
{
if (reviewCheckBox.isChecked())
reviewCards.add(currentCard.getTerm());
else
reviewCards.remove(currentCard.getTerm());
//other code
if (reviewCards.contains(currentCard.getTerm()))
reviewCheckBox.setChecked(true);
else
reviewCheckBox.setChecked(false);
}
}
public void previousWord(View v)
{
if (currentPosition > 0)
{
if (reviewCheckBox.isChecked())
reviewCards.add(currentCard.getTerm());
else
reviewCards.remove(currentCard.getTerm());
//other code
if (reviewCards.contains(currentCard.getTerm()))
reviewCheckBox.setChecked(true);
else
reviewCheckBox.setChecked(false);
}
}
public void updateReviewCards()
{
editor.clear();
for (String card : reviewCards)
editor.putString(card, card);
editor.commit();
}
The set returned by getPreferences().getAll().keySet() does not support adding.
Related
In my application I have a booking system which allows users to book tee times for specific times during the day. When a booking has been completed the details are saved to my Firebase and the user can then close the alert dialog. When the alert dialog is then closed the button which was clicked is then made unusable. Problem is that when the user leaves the booking activity and comes back the button is then useable, and if a different user then accesses the page the button is also able to be clicked as well.
How do I solve this problem?
Should I be saving the UID of the user in the 9am child ?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_booking);
findViewById(R.id.profilebtn).setOnClickListener(this);
findViewById(R.id.booking9am).setOnClickListener(this);
book9am = (Button)findViewById(R.id.booking9am);
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.profilebtn:
finish();
startActivity(new Intent(Booking.this, ProfileActivity.class));
break;
case R.id.booking9am:
final AlertDialog.Builder mBuilder = new AlertDialog.Builder(Booking.this);
View mView = getLayoutInflater().inflate(R.layout.dialog_booking,null);
final EditText mPlayer1 = (EditText) mView.findViewById(R.id.player1);
final EditText mPlayer2= (EditText) mView.findViewById(R.id.player2);
final EditText mPlayer3 = (EditText) mView.findViewById(R.id.player3);
final EditText mPlayer4 = (EditText) mView.findViewById(R.id.player4);
final EditText mTime = (EditText) mView.findViewById(R.id.timeedit);
final Button mBookingbtn = (Button) mView.findViewById(R.id.bookingbtn);
mBookingbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String player1= mPlayer1.getText().toString().trim();
String player2= mPlayer2.getText().toString().trim();
String player4= mPlayer4.getText().toString().trim();
String player3= mPlayer3.getText().toString().trim();
if (player1.isEmpty()) {
mPlayer1.setError("Please enter player 1");
mPlayer1.requestFocus();
return;
}
if (player2.isEmpty()) {
mPlayer2.setError("Please enter player 2");
mPlayer2.requestFocus();
return;
}
if (player3.isEmpty()) {
mPlayer3.setError("Please enter player 2");
mPlayer3.requestFocus();
return;
}if (player2.isEmpty()) {
mPlayer4.setError("Please enter player 2");
mPlayer4.requestFocus();
return;
}
String playerone = mPlayer1.getText().toString();
String playertwo = mPlayer2.getText().toString();
String playerthree = mPlayer3.getText().toString();
String playerfour = mPlayer4.getText().toString();
String teetime= mTime.getText().toString().trim();
DatabaseReference current_user_db = FirebaseDatabase.getInstance().getReference().child("Booking").child("9am");
Map newPost = new HashMap();
newPost.put("playerone",playerone);
newPost.put("playertwo",playertwo);
newPost.put("playerthree",playerthree);
newPost.put("playerfour",playerfour);
newPost.put("teetime",teetime);
current_user_db.setValue(newPost);
Toast.makeText(Booking.this, "Booking Confirmed", Toast.LENGTH_SHORT).show();
book9am.setClickable(false);
}
});
mBuilder.setNeutralButton("Close ", new DialogInterface.OnClickListener() { // define the 'Cancel' button
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
mBuilder.setView(mView);
AlertDialog dialog = mBuilder.create();
dialog.show();
}
}
}
In your onCreate method -
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Booking").child("9am");
ref.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists())
{
book9am.setClickable(false);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
well there could be multiple approaches to this problem.
One is to set a Boolean variable in local storage Shared preference against every user....
Once your click the button set the value to true and when u come back in app check if variable is true then disable button..
Second solution Store the varible against every user on firebase and check(recommended since user can change phone)
Before showing the activity you will have to make a request to your firebase to check if the booking has been completed and depending on the result make the button enabled or not.
findViewById(R.id.booking9am).setOnClickListener(this) instead of this use:-
book9am = (Button)findViewById(R.id.booking9am);
book9am.setOnClickListener(this);
and instead of book9am.setClickable(false) set book9am.setEnable(false);
OR
If you want button disable on some conditions then it can be managed at server side also.
There are two approaches to your problem, depending on your needs.
First, is saving the button's state locally (on the client side), which means that after removing and re-installing the app for example, the state will be reset as well.
In order to save the button's state "forever", you should save the wanted state on the device, and this is what SharedPreferences is made for.
This is a good example of using it.
Here is how you should implement it in your code:
public static void set_isButtonClickable(Context ctx, Boolean bool) {
SharedPreferences.Editor editor = getSharedPreferences(ctx).edit();
editor.putBoolean("BUTTON_CLICKABLE_STATE", bool);
editor.commit();
}
public static boolean getPrefIsFirstLaunch(Context ctx) {
return getSharedPreferences(ctx).getBoolean("BUTTON_CLICKABLE_STATE",false);
}
Second, is saving the button's state on the server side. Removing and re-installing the app obviously won't change its state. Make each user a variable which called "button_state" and change it as needed:
I'm currently working on a school project in Android Studio and so far I've written a code which generates random equations.
Now I display two equations on the screen and the user then has to decide wether the second equation is bigger or smaller than the first one. If the second is bigger, the user presses the button 'bigger', if the second one is smaller, the user presses the button with 'smaller'.
Now I'm trying to write the code that if the user pressed correct, it generates a new equation, if he was wrong, the process stops.
I was thinking of if statements like so:
final ArrayList<String> arrayListCheck = new ArrayList<String>();
if(doubleAnswer1 > doubleAnswer2){
arrayListCheck.add("smaller");
} else {
arrayListCheck.add("bigger");
}
final Button buttonBigger = (Button)findViewById(R.id.button_bigger);
final Button buttonSmaller = (Button)findViewById(R.id.button_smaller);
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if(v.equals(buttonBigger)){
arrayListCheck.add("bigger");
} else {
arrayListCheck.add("smaller");
}
}
};
buttonBigger.setOnClickListener(listener);
buttonSmaller.setOnClickListener(listener);
In the arraylist arrayListCheck it will store either 'bigger' or 'smaller'. Now I want to check if the elements in the arraylist are both the same (either both 'bigger' or 'smaller'), if so a new equation will be generated. If the elements in the arraylist are different (not both the same), the process will be stopped.
I don't know if that really works, so it would be nice if someone could help me with this.
If there is anything unclear in my question, feel free to ask and I will try to clarify the problem :)
Thank you already in advance for your help!
I wouldn't use an ArrayList for that.
I would do the following:
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if(v.equals(buttonBigger) && doubleAnswer1 < doubleAnswer2) {
Log.v("TAG", "you are right");
} else if(v.equals(buttonSmaller) && doubleAnswer1 > doubleAnswer2) {
Log.v("TAG", "you are right");
} else {
Log.v("TAG", "you are wrong");
}
}
};
Arrays are not really neccessary for this kind of simple comparison.
When I login to my android application for the first time, its works perfectly, after I logout, when I try to login its doesn't open the activity,
I have cleared FragmentStack and saved preferences below.
clearFragmentStack();
clearSavedPrefs();
But When i disable or destroy the application from recent apps or delete data from settings. its working normally.
How can I solve this issue. Please find the code below.
builder.setPositiveButton(android.R.string.ok,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
httpClientService.canCanLogout(new ResponseCallBack<BaseDao>() {
#Override
public void onDataReceived(
HttpResponseHolder<BaseDao> responseHolder) {
if (responseHolder.getErrReason() != null) {
generalProperListener.showShortToastMessage(responseHolder.getErrReason());
} else {
startUserLoginFragment();
ct.event.push("Logout");
}
}
});
}
});
I have cleared the answer.
Where I have concat the previous string value.
//old
UserAddress.ADDR_URL +="?".concat(paramsString);
//new
UserAddress.ADDR_URL =URL+"?".concat(paramsString);
I have created an activity that refresh quotes when the user clicks a button. Within the same activity there is a check box which the users can click if they like the quote.
Everything works perfectly apart from the check box. When the user clicks they like the quote, I want that check box checked. This only happens when the user moves away from the activity and returns at a later stage.
However when the user stays within the activity and returns to the quote, the old state is shown instead of the users preference.
The check box is configured from the values even in the database, if the value is 1, the check box should be ticked, if not, check box should be clear.
The code is shown below:
When the user clicks the next button, the following code is executed:
Button nextGenerateButton = (Button) findViewById(R.id.btn_next_quotes);
nextGenerateButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
String nextQuote = myDbHelper.getnextQuote();
setQuoteDisplay(nextQuote);
btn_favorite.setChecked(myDbHelper.getFavouriteCheckBoxValue());
}
});
The button retrieves the next quote and the getFavouriteCheckBoxValue() confirms whether the favourite column is marked in the database and either returns a true of false which sets the check box value.
public boolean getFavouriteCheckBoxValue()
{
int laballedFavourite = cursor.getInt(0);
if(laballedFavourite == 0)
{
return false;
}
else
{
return true;
}
}
if the user likes the quote, the code executes the addFavourite() which updates the table where the favourite column will be modified on one.
btn_favorite.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked == true)
{
myDbHelper.addFavourite();
}
if(isChecked == false)
{
myDbHelper.removeFavourite();
}
}
});
public void addFavourite()
{
ContentValues vals = new ContentValues();
vals.put("favouriteQuote", 1);
db.update(TABLE_NAME, vals, "columnId = " + cursor.getInt(1), null);
}
Again this only works perfectly when I resume the quote activity and not when I am currently live in the quote activity.
Hope this makes sense.
Any help would be greatly appreciated.
You need to refresh your checkbox to see the changement because you made a changement in you db but not on the UI. You need to observe the db and refresh the checkbox after a modification.
Refreshing cursor solved the problem.
I have a view to create an account. If the save button is clicked and any of the fields are left open, it displays a toast. If all fields are filled in, the account is saved. I tried to accomplish this with an onClickListener that has an iteration through all the fields. It works perfectly if a field is not filled in and it works perfectly if alle fields are filled, but when a field isn't filled, I type something in there, try to save again and the button doesn't do anything.
I think it has something to do with the return, but I don't know what to do else. If the return wouldn't be there, I would get a toast for each field that isn't filled in.
Here's the relevant code:
private void registerButtonListeners() {
mCRUDAccountButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i = 0; i < mEditTexts.length; i++) {
if(mEditTexts[i].getText().length() == 0){
CommonCode.showToast(mNoTextTitles[i], mContext, mViewGroup);
mEmptyField = 1;
return;
}
};
if (mEmptyField == 0){
saveState();
}
}
});
}
thanks guys!
You're never resetting your flag back to 0!
so...
#Override
public void onClick(View v) {
mEmptyField = 0;//RIGHT HERE (give them the benefit of the doubt)
for (int i = 0; i < mEditTexts.length; i++) {
if(mEditTexts[i].getText().length() == 0){
CommonCode.showToast(mNoTextTitles[i], mContext, mViewGroup);
mEmptyField = 1; //You were too optimistic, they failed.
return;
}
};
if (mEmptyField == 0){
saveState();
}
}
});
Now, you're doing this test for the first time, every time. Otherwise, you go through and set that flag to 1, and next time, even though your loop never finds a match, when you get to the if mPentyField == 0 test, it fails cause you set that to 1 in the previous go around.