I tried to build my app, and this error message was produced.
Unexpected character '=' (code 61) (expected a name start character) at [row,col {unknown-source}]: [41,21]
I have cleaned my code and tried to clean my code and inspected my code and i can't find anything wrong my code, and help would be gratefully recieved.
This is my MainActivity.
package com.michaeldoughty.android.football_quiz;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import
androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.*;
import java.text.DecimalFormat;
public class MainActivity extends AppCompatActivity
{
// to answer true for the question
private Button mTrueButton;
// to answer false for the question
private Button mFalseButton;
// to get the next question
private ImageButton mNextButton;
// to cheat
private Button mCheatButton;
// to hold the questions
private TextView mQuestionTextView;
// whether the user is a cheater
private boolean mIsCheater;
// a key used for the onSaveInstanceState
private final String KEY_INDEX = "index";
// An ActivityResultLauncher for the CheatActivity
ActivityResultLauncher<Intent> cheatActivityResultLauncher =
registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
new ActivityResultCallback<ActivityResult>()
{
@Override
public void onActivityResult (ActivityResult
result)
{
//checking if there is a result code from the
returned intent
if (result.getResultCode () == RESULT_OK)
{
// to check is there is any data in the
returned intent
if (result.getData() == null)
{
return;
}
// setting that the user is a cheater
mIsCheater = true;
}
}
});
// an array of Question objects
private Question [] mQuestionBank = new Question []
{
new Question (R.string.question_euro, true),
new Question (R.string.question_world_cup, false),
new Question (R.string.question_premier_league,
false),
new Question (R.string.question_england, true),
new Question (R.string.question_fa_cup, false),
new Question (R.string.question_league_cup, true)
};
// the index of the current question being displayed
private int mCurrentIndex = 0;
// to hold the percentage of correct answers
private double percentage = 0;
// to hold the amount of correct answers
private double correct = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// to check if there is a value of mCurrentIndex in the
savedInstanceState
if (savedInstanceState != null)
{
mCurrentIndex = savedInstanceState.getInt (KEY_INDEX,
0);
}
// to create the mQuestionTextView
mQuestionTextView = (TextView) findViewById
(R.id.question_text_view);
mQuestionTextView.setOnClickListener(new
View.OnClickListener()
{
@Override
public void onClick(View view)
{
// update the mCurrrentIndex
mCurrentIndex++;
// enable the mTrueButton and mFalseButton
mTrueButton.setEnabled (true);
mFalseButton.setEnabled (true);
if (mCurrentIndex < 6)
{
// call the updateQuestion method
updateQuestion();
}
else
{
displayPercentage ();
mCurrentIndex = 0;
updateQuestion();
}
}
});
// call the updateQuestion method
updateQuestion ();
// to create the mTrueButton
mTrueButton = (Button) findViewById (R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
// call the checkAnswer method
checkAnswer (true);
// disable the mTrueButton and mFalseButton
mTrueButton.setEnabled (false);
mFalseButton.setEnabled (false);
}
});
// to create the mFalseButton
mFalseButton = (Button) findViewById (R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
// call the checkAnswer method
checkAnswer (false);
// disable the mTrueButton and mFalseButton
mTrueButton.setEnabled (false);
mFalseButton.setEnabled (false);
}
});
// to create the mNextButton
mNextButton = (ImageButton) findViewById
(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
// update the mCurrrentIndex
mCurrentIndex++;
// enable the mTrueButton and mFalseButton
mTrueButton.setEnabled (true);
mFalseButton.setEnabled (true);
if (mCurrentIndex < 6)
{
// call the updateQuestion method
updateQuestion();
}
else
{
displayPercentage ();
mCurrentIndex = 0;
updateQuestion();
}
}
});
// to create the mCheatButton
mCheatButton = (Button) findViewById (R.id.cheat_button);
mCheatButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
boolean answerIsTrue = mQuestionBank
[mCurrentIndex].isAnswerTrue ();
Intent intent = CheatActivity.newIntent
(MainActivity.this, answerIsTrue);
cheatActivityResultLauncher.launch (intent);
}
});
}
/**
The onSaveInstanceState method saves savedInstanceState when
the activity is stopped.
@param savedInstanceState, the bundle of the activity.
*/
@Override
public void onSaveInstanceState (Bundle savedInstanceState)
{
// call the super's constructor
super.onSaveInstanceState (savedInstanceState);
// to add the mCurrentIndex to the bundle
savedInstanceState.putInt (KEY_INDEX, mCurrentIndex);
}
/**
The updateQuestion method updates the question.
*/
public void updateQuestion ()
{
// get the next question
int question = mQuestionBank [mCurrentIndex].getTextResId
();
// to display the next question
mQuestionTextView.setText (question);
}
/**
The checkAnswer method checks the user's answer, to see if
its correct or not
@param userPressedTrue, the user's answer.
*/
public void checkAnswer (boolean userPressedTrue)
{
// getting the correct answer
boolean answerIsTrue = mQuestionBank
[mCurrentIndex].isAnswerTrue ();
// the message in the toast
int messageResId = 0;
// checking the user's answer and setting the right meassge
if (userPressedTrue == answerIsTrue)
{
messageResId = R.string.correct_toast;
correct++;
}
else
{
messageResId = R.string.incorrect_toast;
}
// displaying the meessage in a toast
Toast toast;
toast = Toast.makeText(this, messageResId,
Toast.LENGTH_SHORT);
toast.setGravity (Gravity.TOP|Gravity.CENTER, 0, 0);
toast.show ();
}
/**
The displayPercentage displays the percentage of correct
answers the user had guessed.
*/
public void displayPercentage ()
{
// working out the percentage
percentage = (correct / mQuestionBank.length) * 100;
DecimalFormat df = new DecimalFormat("#.00");
// displaying the percentage as a toast
Toast.makeText(this, "You have guessed " +
df.format(percentage) + "%!", Toast.LENGTH_SHORT).show ();
// to set the correct and percentage back to zero
correct = 0;
percentage = 0;
}
}
Here is my CheatActivity
// an extra key for the intent which tells the CheatActivity
what the answer is
private static final String EXTRA_ANSWER_IS_TRUE =
"com.michaeldoughty.android.football_quiz_answer_is_true";
// an extra key for the intent which tells the MainActivity if
the user has cheated
private static final String EXTRA_ANSWER_IS_SHOWN =
"com.michaeldoughty.android.football_quiz_answer_shown";
// if the answer is true or not
private boolean mAnswerIsTrue;
// to hold the correct answer
private TextView mAnswerTextView;
// a button to show the correct answer
private Button mShowAnswerButton;
// to create an intent to create a CheatActivity
public static Intent newIntent (Context packageContext,
boolean answerIsTrue)
{
Intent intent = new Intent (packageContext,
CheatActivity.class);
intent.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
return intent;
}
public static boolean wasAnswerShown (Intent result)
{
return result.getBooleanExtra (EXTRA_ANSWER_IS_SHOWN,
false);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
// to get the mAnswerIsTrue
mAnswerIsTrue = getIntent ().getBooleanExtra
(EXTRA_ANSWER_IS_TRUE, false);
// to create the mAnswerTextView
mAnswerTextView = findViewById (R.id.answer_text_view);
// to create the mShowAnswerButton
mShowAnswerButton = findViewById (R.id.show_answer_button);
mShowAnswerButton.setOnClickListener(new
View.OnClickListener()
{
@Override
public void onClick(View view)
{
if (mAnswerIsTrue)
{
mAnswerTextView.setText (R.string.true_button);
}
else
{
mAnswerTextView.setText
(R.string.false_button);
}
setAnswerShownResult (true);
}
});
}
/**
The setAnswerShownResult creates an Intent, to send the
isAnswerShown to the MainActivity.
@param isAnswerShown, whether the user has cheated or not.
*/
private void setAnswerShownResult (boolean isAnswerShown)
{
Intent data = new Intent ();
data.putExtra (EXTRA_ANSWER_IS_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
}
Here is my Question class
package com.michaeldoughty.android.football_quiz;
public class Question
{
// to hold the text res id of the question
private int mTextResId;
// to hold if the answer is true or false
private boolean mAnswerTrue;
/**
Constructor
*/
public Question (int textResId, boolean answerTrue)
{
mTextResId = textResId;
mAnswerTrue = answerTrue;
}
public int getTextResId()
{
return mTextResId;
}
public void setTextResId(int textResId)
{
mTextResId = textResId;
}
public boolean isAnswerTrue()
{
return mAnswerTrue;
}
public void setAnswerTrue(boolean answerTrue)
{
mAnswerTrue = answerTrue;
}
}
