Cheers! Succeed in Challenge 5.5

1

After hard work, Challenge 5.5 has finally been conquered. Here is the solution:

package com.bignerdranch.android.geoquiz;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class QuizActivity extends AppCompatActivity {

    private static final String TAG = "QuizActivity";
    private static final String KEY_INDEX = "index";
    private static final String KEY_ANSWERED="answered";
    private static final int REQUEST_CODE_CHEAT = 0;
    private Button mTrueButton;
    private Button mFalseButton;
    private Button mNextButton;
    private Button mCheatButton;
    private TextView mQuestionTextView;

    private Question[] mQuestionBank = new Question[]{
            new Question(R.string.question_australia, true),
            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 boolean mIsCheater;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "onCreate(Bundle) called");
        setContentView(R.layout.activity_quiz);

        if (savedInstanceState != null) {
            mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
            mIsCheater=savedInstanceState.getBoolean(KEY_ANSWERED,false);
        }

        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);
            }
        });

        mNextButton = (Button) findViewById(R.id.next_button);
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                mIsCheater = false;
                updateQuestion();
            }
        });

        mCheatButton = (Button) findViewById(R.id.cheat_button);
        mCheatButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Start CheatActivity
                boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
                Intent intent = CheatActivity.newIntent(QuizActivity.this, answerIsTrue);
                startActivityForResult(intent, REQUEST_CODE_CHEAT);
            }
        });
        updateQuestion();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) {
            return;
        }

        if (requestCode == REQUEST_CODE_CHEAT) {
            if (data == null) {
                return;
            }
            mIsCheater = CheatActivity.wasAnswerShown(data);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(TAG, "onStart() called");
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.d(TAG, "onResume() called");
    }

    @Override
    public void onPause() {
        super.onPause();
        Log.d(TAG, "onPause() called");
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        Log.i(TAG, "onSaveInstanceState");
        savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
        savedInstanceState.putBoolean(KEY_ANSWERED, mIsCheater);
    }

    @Override
    public void onStop() {
        super.onStop();
        Log.d(TAG, "onStop() called");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy() called");
    }

    private void updateQuestion() {

        int question = mQuestionBank[mCurrentIndex].getTextResId();
        mQuestionTextView.setText(question);
    }

    private void checkAnswer(boolean userPressedTrue) {
        boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();

        int messageResId = 0;

        if (mIsCheater) {
            messageResId = R.string.judgment_toast;
        } else {
            if (userPressedTrue == answerIsTrue) {
                messageResId = R.string.correct_toast;
            } else {
                messageResId = R.string.incorrect_toast;
            }
        }

        Toast.makeText(this, messageResId, Toast.LENGTH_LONG)
                .show();
    }
}

package com.bignerdranch.android.geoquiz;

import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class CheatActivity extends AppCompatActivity {
private static final String EXTRA_ANSWER_IS_TRUE =
“com.bignerdranch.android.geoquiz.answer_is_true”;
//private static final String EXTRA_ANSWER_SHOWN=
// “com.bignerdranch.android.geoquiz.answer_shown”;
private static final String KEY_ANSWERED=“answered”;
private boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswerButton;
private Boolean mWhether=false;
/*;
private boolean mAnswerIsTrue;
*/

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(KEY_ANSWERED,false);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_cheat);
    mAnswerIsTrue=getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE,false);
    mAnswerTextView=(TextView)findViewById(R.id.answer_text_view);

    if (savedInstanceState != null) {
        mWhether = savedInstanceState.getBoolean(KEY_ANSWERED, false);
    }
    mShowAnswerButton=(Button)findViewById(R.id.show_answer_button);
    mShowAnswerButton.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            if(mAnswerIsTrue) {
                mAnswerTextView.setText(R.string.true_button);
            }else {
                mAnswerTextView.setText(R.string.false_button);
                }
                mWhether=true;
            setAnswerShownResult(mWhether);

            }
    });
    setAnswerShownResult(mWhether);
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState){
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putBoolean(KEY_ANSWERED,mWhether);
}
private void setAnswerShownResult(boolean mIsCheater){
    Intent data=new Intent();
    //data.putExtra(EXTRA_ANSWER_SHOWN,isAnswerShown);
    data.putExtra(KEY_ANSWERED,mWhether);
    setResult(RESULT_OK,data);
}

}