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Google billing API automatically refunding in-app purchases even after being aknowledged

I tried looking at previous questions and answers but with no luck finding a real solution. I'm acknowledging purchases once they are processed although my users are still automatically refunded. Below is my whole purchase activity. It's a simple activity with a big button to purchase the app's full version. Anoter button to restore previous purchases. A third button to show some advice if users were not able to restore their purchase.
Any help would be appreciated!
public class BuyActivity extends AppCompatActivity {
Button unlock_button;
Button restore_purchase;
static final String PRODUCT_ID = "full_version";
private BillingClient billingClient;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_buy);
unlock_button = findViewById(R.id.unlock_button);
restore_purchase = findViewById(R.id.restore_purchase);
billingClient = BillingClient.newBuilder(getApplicationContext())
.setListener((billingResult, list) -> {
// responds to all purchases that were already made
if (billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK && list!= null) {
for (Purchase purchase:list){
if (purchase.getPurchaseState() == Purchase.PurchaseState.PURCHASED) {
acknowledge_purchase(purchase);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
features_unlocked();
}
},500);
} else {
Toast.makeText(getApplicationContext(), "ERROR OCCURRED", Toast.LENGTH_SHORT).show();
}
}
} else if (billingResult.getResponseCode()==BillingClient.BillingResponseCode.ITEM_ALREADY_OWNED && list!=null) {
features_unlocked();
} else {
Toast.makeText(getApplicationContext(), "ERROR OCCURRED", Toast.LENGTH_SHORT).show();
}
})
.enablePendingPurchases()
.build();
connect_to_google();
restore_purchase.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
restore_purchase();
}
});
unlock_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//launch_purchase_flow(productDetailsList.get(0));
Toast.makeText(getApplicationContext(), "CAN'T START THE PURCHASE PROCESS", Toast.LENGTH_SHORT).show();
}
});
}
void features_unlocked(){
App.get().MyTheme = 1;
Intent i = new Intent(BuyActivity.this, Unlocked_celebration.class);
startActivity(i);
finish();
}
void connect_to_google(){
billingClient.startConnection(new BillingClientStateListener() {
#Override
public void onBillingSetupFinished(BillingResult billingResult) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
// The BillingClient is ready. You can query purchases here.
get_product_details(); // download all details to different variables as you want
Log.i( "appName", String.format( "billing setup response code %s", billingResult.toString() ) );
}
}
#Override
public void onBillingServiceDisconnected() {
connect_to_google();
// Try to restart the connection on the next request to
// Google Play by calling the startConnection() method.
}
});
}
//show products available to buy
void get_product_details(){
List<String> productIds = new ArrayList<>();
productIds.add("full_version");
SkuDetailsParams params = SkuDetailsParams
.newBuilder()
.setSkusList(productIds)
.setType(BillingClient.SkuType.INAPP)
.build();
billingClient.querySkuDetailsAsync(
params,
new SkuDetailsResponseListener() {
#Override
public void onSkuDetailsResponse(#NonNull BillingResult billingResult, #Nullable List<SkuDetails> list) {
if (billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK && list!=null){
if (list.size()>0) {
Log.println(Log.DEBUG,"TAG", "onSkuDetailsResponse: " + list.get(0).getPrice());
unlock_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
billingClient.launchBillingFlow(
BuyActivity.this,
BillingFlowParams.newBuilder().setSkuDetails(list.get(0)).build()
);
}
});
}
}
}
}
);
}
void acknowledge_purchase(Purchase purchase){
AcknowledgePurchaseParams acknowledgePurchaseParams = AcknowledgePurchaseParams
.newBuilder()
.setPurchaseToken(purchase.getPurchaseToken())
.build();
billingClient.acknowledgePurchase(acknowledgePurchaseParams, new AcknowledgePurchaseResponseListener() {
#Override
public void onAcknowledgePurchaseResponse(#NonNull BillingResult billingResult) {
if (billingResult.getResponseCode() == BillingClient.BillingResponseCode.OK) {
}
}
});
}
void restore_purchase(){
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
connect_to_google();
new Handler().post(new Runnable() {
#Override
public void run() {
billingClient.queryPurchasesAsync(
BillingClient.SkuType.INAPP,
new PurchasesResponseListener() {
#Override
public void onQueryPurchasesResponse(#NonNull BillingResult billingResult, #NonNull List<Purchase> list) {
if (billingResult.getResponseCode()==BillingClient.BillingResponseCode.OK) {
for (Purchase purchase: list){
if (purchase.getPurchaseState()==Purchase.PurchaseState.PURCHASED
&& !purchase.isAcknowledged()) {
acknowledge_purchase(purchase);
features_unlocked();
} else if (purchase.getPurchaseState()==Purchase.PurchaseState.PURCHASED) {
features_unlocked();
}
}
} else if (billingResult.getResponseCode()==BillingClient.BillingResponseCode.ITEM_ALREADY_OWNED) {
features_unlocked();
}
}
}
);
}
});
}
},300);
}
protected void onResume() {
super.onResume();
restore_purchase();
}
#Override
protected void onStop() {
super.onStop();
if (billingClient != null) billingClient.endConnection();
}
#Override
protected void onStart() {
super.onStart();
}
#Override
public void onDestroy() {
if (billingClient != null) billingClient.endConnection();
billingClient=null;
super.onDestroy();
}
#Override
protected void onPause() {
super.onPause();
if (billingClient != null) billingClient.endConnection();
}
public void cantRestore(View v){
Intent i = new Intent(BuyActivity.this, RestorePurchase.class);
startActivity(i);
}
}

How to insert Scanned data in FireBase Realtime DataBase from QR/Barcode?

This is my code it is working fine it scans Qr/Barcode, but I want scanned data to insert in fire-base database. This app is connected with fire-base and using ML kit for barcode scanning. This app also has login signup connected with fire-base auth and scanner app. but I don't know how to push scanned data in fire-base realtime database in android studio.
public class MainActivity extends AppCompatActivity {
View view;
CameraView camera_view;
boolean isDetected= false;
Button btn_start_again;
private static final String TAG = "MainActivity";
FirebaseVisionBarcodeDetectorOptions options;
FirebaseVisionBarcodeDetector detector;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseVisionBarcodeDetector detector = FirebaseVision.getInstance()
.getVisionBarcodeDetector();
Dexter.withActivity(this)
.withPermissions(new String[]{Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO})
.withListener(new MultiplePermissionsListener() {
#Override
public void onPermissionsChecked(MultiplePermissionsReport report) {
setupCamera();
}
#Override
public void onPermissionRationaleShouldBeShown(List<PermissionRequest> permissions, PermissionToken token) {
}
}).check();
}
public void logout(View view) {
FirebaseAuth.getInstance().signOut();//logout
startActivity(new Intent(getApplicationContext(),login.class));
finish();
}
private void setupCamera()
{
btn_start_again= (Button)findViewById(R.id.btn_again);
btn_start_again.setEnabled(isDetected);
btn_start_again.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
isDetected = !isDetected;
}
});
camera_view = (CameraView)findViewById(R.id.cameraView);
camera_view.setLifecycleOwner(this);
camera_view.addFrameProcessor(new FrameProcessor() {
#Override
public void process(#NonNull Frame frame)
{
processImage(getVisionImageFromFrame(frame));
}
});
options = new FirebaseVisionBarcodeDetectorOptions.Builder()
.setBarcodeFormats(FirebaseVisionBarcode.FORMAT_QR_CODE)
.build();
detector = FirebaseVision.getInstance().getVisionBarcodeDetector(options);
}
private void processImage(FirebaseVisionImage image){
if(!isDetected)
{
detector.detectInImage(image)
.addOnSuccessListener(new OnSuccessListener<List<FirebaseVisionBarcode>>() {
#Override
public void onSuccess(List<FirebaseVisionBarcode> firebaseVisionBarcodes) {
processResult(firebaseVisionBarcodes);
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
Toast.makeText(MainActivity.this, ""+e.getMessage(),Toast.LENGTH_SHORT).show();
}
});
}
}
private void processResult(List<FirebaseVisionBarcode> firebaseVisionBarcodes){
if (firebaseVisionBarcodes.size()>0)
{
isDetected = true;
btn_start_again.setEnabled(isDetected);
for(FirebaseVisionBarcode item: firebaseVisionBarcodes)
{
int value_type = item.getValueType();
switch (value_type)
{
case FirebaseVisionBarcode.TYPE_TEXT:
{
createDialog(item.getRawValue());
}
break;
case FirebaseVisionBarcode.TYPE_URL:
{
//start browser intent
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(item.getRawValue()));
startActivity(intent);
}
break;
case FirebaseVisionBarcode.TYPE_CONTACT_INFO:
{
String info = new StringBuilder("Name: ")
.append(item.getContactInfo().getName().getFormattedName())
.append("\n")
.append("Address: ")
.append(item.getContactInfo().getAddresses().get(0).getAddressLines())
.append("\n")
.append("Email: ")
.append(item.getContactInfo().getEmails().get(0).getAddress())
.toString();
createDialog(info);
}
break;
default:
break;
}
}
}
}
private void createDialog(String text)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(text)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
private FirebaseVisionImage getVisionImageFromFrame(Frame frame){
byte[] data= frame.getData();
FirebaseVisionImageMetadata metadata = new FirebaseVisionImageMetadata.Builder()
.setFormat(FirebaseVisionImageMetadata.IMAGE_FORMAT_NV21)
.setHeight(frame.getSize() .getHeight())
.setWidth(frame.getSize() .getWidth())
//.setRotation(frame.getRotation())
.build();
return FirebaseVisionImage.fromByteArray(data,metadata);
}
}

Playing multiple sounds via multiple buttons from raw in background using service

I want to play 6 different sounds triggered by 6 different buttons in background, so that if the app is on background the sound keeps playing.
When one sound is already playing, pressing another button will stop it and play its own sound,
Tapping the same button 2K times it stops, 2K+1 times: starts again.. (K is a non-null integer)
All of the code is done and seems to be working correctly, except that the player stops after one and a half minute. (This is not because of low memory)
Can anyone please tell me what am I doing wrong?
public class PlayService extends Service {
private MediaPlayer player;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
player = new MediaPlayer();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
int btnId = intent.getExtras().getInt("ID");
Toast.makeText(this, "onStart service" + btnId, Toast.LENGTH_SHORT).show();
selectResId(btnId);
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service destroyed", Toast.LENGTH_SHORT).show();
if (player != null) {
player.stop();
player.release();
}
player = null;
}
#Override
public void onLowMemory() {
super.onLowMemory();
Toast.makeText(this, "Low mem", Toast.LENGTH_SHORT).show();
}
private void selectResId(int resId){
switch (resId){
case 1: playMediaFromResource(R.raw.number_one);
case 2: playMediaFromResource(R.raw.number_two);
case 3: playMediaFromResource(R.raw.number_three);
case 4: playMediaFromResource(R.raw.number_four);
case 5: playMediaFromResource(R.raw.number_five);
case 6: playMediaFromResource(R.raw.number_six);
default: break;
}
}
private void playMediaFromResource(int resId) {
Uri mediaPath = Uri.parse("android.resource://" + getPackageName() + "/" + resId);
try {
player.setDataSource(getApplicationContext(), mediaPath);
player.setLooping(true);
player.prepare();
player.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
And the MainActivity:
public class MainActivity extends AppCompatActivity {
private Button btnStart1;
private Button btnStart2;
private Button btnStart3;
private Button btnStart4;
private Button btnStart5;
private Button btnStart6;
private Intent intent;
private int previousID = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewsByIds();
setOnClickListeners();
}
private void findViewsByIds() {
btnStart1 = findViewById(R.id.btn_start_1);
btnStart2 = findViewById(R.id.btn_start_2);
btnStart3 = findViewById(R.id.btn_start_3);
btnStart4 = findViewById(R.id.btn_start_4);
btnStart5 = findViewById(R.id.btn_start_5);
btnStart6 = findViewById(R.id.btn_start_6);
}
private void setOnClickListeners() {
btnStart1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(1);
}
});
btnStart2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(2);
}
});
btnStart3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(3);
}
});
btnStart4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(4);
}
});
btnStart5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(5);
}
});
btnStart6.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkIntentState(6);
}
});
}
private void checkIntentState(int ID) {
if (intent == null) {
createNewIntent(ID);
} else {
stopService(intent);
intent = null;
if (ID != previousID) {
createNewIntent(ID);
}
}
}
private void createNewIntent(int ID) {
intent = new Intent(MainActivity.this, PlayService.class);
intent.putExtra("ID", ID);
startService(intent);
previousID = ID;
}
}

I want to answer to my own question just in case anyone else runs into the problem.
It turns out, that Android added some new features (restricted access to background resources for battery life improvement purposes since Oreo(i.e. Android 8.0+ || API level 26)).
As the documentation says:
"Apps that are running in the background now have limits on how freely they can access background services."
So, in this case we will need to use foreground services.

can't get to second activity after spots dialog "keep's on loading"

can't get to second activity after spots dialog "keep's on loading" on my main activity and can load for hours without error i use facebook acount kit i dont see the error out here is the main activity source code
main activity java :
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_CODE = 1000;
Button btnContinue;
RelativeLayout rootLayout;
FirebaseAuth auth;
FirebaseDatabase db;
DatabaseReference users;
#Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//bf4 set context view
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Arkhip_font.ttf")
.setFontAttrId(R.attr.fontPath)
.build());
setContentView(R.layout.activity_main);
printKeyHash();
//Init Firebase
auth = FirebaseAuth.getInstance();
db = FirebaseDatabase.getInstance();
users = db.getReference(Common.user_driver_tbl);
//init view
btnContinue = (Button)findViewById(R.id.btnContinue);
rootLayout =(RelativeLayout)findViewById(R.id.rootLayout);
//Event
btnContinue.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
signInwithPhone();
}
});
//auto login to facebook act kit for second time
if (AccountKit.getCurrentAccessToken() != null)
{
//create dialog
final AlertDialog waitingDialog = new SpotsDialog(this);
waitingDialog.show();
waitingDialog.setMessage("Please waiting....");
waitingDialog.setCancelable(false);
AccountKit.getCurrentAccount(new AccountKitCallback<Account>() {
#Override
public void onSuccess(Account account) {
//copy from exiting user
users.child(account.getId())//fixed
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Common.currentUser = dataSnapshot.getValue(User.class);
Intent homeIntent = new Intent(MainActivity.this,DriverHome.class);
startActivity(homeIntent);
//Dismiss dialog
waitingDialog.dismiss();
finish();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
#Override
public void onError(AccountKitError accountKitError) {
}
});
}
}
private void signInwithPhone() {
Intent intent = new Intent(MainActivity.this, AccountKitActivity.class);
AccountKitConfiguration.AccountKitConfigurationBuilder configurationBuilder =
new AccountKitConfiguration.AccountKitConfigurationBuilder(LoginType.PHONE,
AccountKitActivity.ResponseType.TOKEN);
intent.putExtra(AccountKitActivity.ACCOUNT_KIT_ACTIVITY_CONFIGURATION,configurationBuilder.build());
startActivityForResult(intent,REQUEST_CODE);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE)
{
AccountKitLoginResult result = data.getParcelableExtra(AccountKitLoginResult.RESULT_KEY);
if (result.getError() !=null)
{
Toast.makeText(this, ""+result.getError().getErrorType().getMessage(), Toast.LENGTH_SHORT).show();
return;
}
else if (result.wasCancelled())
{
Toast.makeText(this, "Cancel login", Toast.LENGTH_SHORT).show();
return;
}
else{
if (result.getAccessToken() !=null)
{
//Show dialog
final AlertDialog waitingDialog = new SpotsDialog(this);
waitingDialog.show();
waitingDialog.setMessage("Please waiting....");
waitingDialog.setCancelable(false);
//get current phone
AccountKit.getCurrentAccount(new AccountKitCallback<Account>() {
#Override
public void onSuccess(final Account account) {
final String userId = account.getId();
//check if exist on firebase
users.orderByKey().equalTo(account.getId())
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.child(account.getId()).exists())//if not exits
{
//will we create new user login
final User user = new User();
user.setPhone(account.getPhoneNumber().toString());
user.setName(account.getPhoneNumber().toString());
user.setAvatarUrl("");
user.setRates("0.0");
//Register to Firebase
users.child(account.getId())
.setValue(user)
.addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void aVoid) {
//Login
users.child(account.getId())
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Common.currentUser = dataSnapshot.getValue(User.class);
Intent homeIntent = new Intent(MainActivity.this,DriverHome.class);
startActivity(homeIntent);
//Dismiss dialog
waitingDialog.dismiss();
finish();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
Toast.makeText(MainActivity.this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
else //if user existing ,login
{
users.child(account.getId())
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Common.currentUser = dataSnapshot.getValue(User.class);
Intent homeIntent = new Intent(MainActivity.this,DriverHome.class);
startActivity(homeIntent);
//Dismiss dialog
waitingDialog.dismiss();
finish();
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
#Override
public void onError(AccountKitError accountKitError) {
Toast.makeText(MainActivity.this, ""+accountKitError.getErrorType().getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
}
}
}
private void printKeyHash() {
try{
PackageInfo info = getPackageManager().getPackageInfo("com.example.rd.androidapp",
PackageManager.GET_SIGNATURES);
for (Signature signature:info.signatures)
{
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(signature.toByteArray());
Log.d("KEYHASH", Base64.encodeToString(md.digest(),Base64.DEFAULT));
}
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
}
if more is needed !!! or is there something lacking also i am still new in android programing so ...

Try to uses dismiss the dialog in onCancel and onError method and print error for discretion.

GeoQuiz app from BigNerdRanch no working as it is supposed to be

I am new to android, I am developing the GeoQuiz app from the 'Android Programming The Big Nerd Ranch Guide V2' book, after reading the book thoroughly(1st chapter), I made the quiz app. But its not displaying the Toasts for correct and incorrect answers! I am definitely doing something wrong!!, could someone help me out.
public class MainActivity extends AppCompatActivity {
private Button mTrueButton,mFalseButton,mNextButton;
private TextView mQuestionTextView;
private Question[] mQuestionBank= new Question[]{
new Question(R.string.question_oceans, true),
new Question(R.string.question_mideast, false),
new Question(R.string.question_africa, false),
new Question(R.string.question_americas, true),
new Question(R.string.question_asia, true)
};
private int mCurrentIndex=0;
private void updateQuestion(){
int question=mQuestionBank[mCurrentIndex].getTextResId();
mQuestionTextView.setText(question);
}
public void checkAnswer(boolean userPressedTrue){
boolean answerIsTrue=mQuestionBank[mCurrentIndex].isAnswerTrue();
int messageResId=0;
if(userPressedTrue == answerIsTrue){
messageResId=R.string.correct_toast;
}
else
{
messageResId=R.string.incorrect_toast;
}
Toast.makeText(getApplicationContext(), messageResId, Toast.LENGTH_SHORT);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNextButton=(Button)findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
}
});
mQuestionTextView=(TextView)findViewById(R.id.question_text_view);
mTrueButton=(Button)findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
}
});
mFalseButton=(Button)findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
}
});
updateQuestion();
}
}
And here's the Question Activity
public class Question {
private int mTextResId;
private boolean mAnswerTrue;
public Question(int textResId, boolean answerTrue){
mTextResId=textResId;
mAnswerTrue=answerTrue;
}
public boolean isAnswerTrue() {
return mAnswerTrue;
}
public int getTextResId() {
return mTextResId;
}
public void setTextResId(int textResId) {
mTextResId = textResId;
}
public void setAnswerTrue(boolean answerTrue){
mAnswerTrue=answerTrue;
}
}

You are creating the Toast, but not showing it. Make a call to show() and see, like this:
Toast.makeText(getApplicationContext(), messageResId, Toast.LENGTH_SHORT).show();