GeoQuiz项目的开发过程及总结

GeoQuiz项目的开发过程

1.用户界面的设计（xml文件）
（1）activity_quiz界面

（2）activity_cheat界面

（3）activity_crime界面

（4）fragment_crime_list界面

（5）list_item_crime界面

2.用户界面的功能实现（创建类）

 （1）quizActivity

public class QuizActivity extends AppCompatActivity {
    private Button mTrueButton;
    private Button mFalseButton;
    private Button mNextButton;
    private Button mCheatButton;
    private TextView mQuestionTextView;

    private static final String TAG = "QuizActivity";
    private static final String KEY_INDEX = "index";
    private static final int REQUEST_CODE_CHEAT = 0;

    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);
        }

        mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
        //int question = mQuestionBank[mCurrentIndex].getTextResId();
        //mQuestionTextView.setText(question);

        mTrueButton = (Button) findViewById(R.id.true_button);
        mTrueButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText(QuizActivity.this,
                //R.string.correct_toast,
                // Toast.LENGTH_SHORT).show();
                checkAnswer(true);
            }
        });

        mFalseButton = (Button) findViewById(R.id.false_button);
        mFalseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Toast.makeText(QuizActivity.this,
                // R.string.incorrect_toast,
                //Toast.LENGTH_SHORT).show();
                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;
                //int question = mQuestionBank[mCurrentIndex].getTextResId();
                // mQuestionTextView.setText(question);
                mIsCheater = false;
                updateQuestion();
            }
        });
        mCheatButton = (Button) findViewById(R.id.cheat_button);
        mCheatButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Start CheatActivity
                //Intent intent = new Intent(QuizActivity.this, CheatActivity.class);
                boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswertrue();
                Intent intent = CheatActivity.newIntent(QuizActivity.this, answerIsTrue);
                //startActivity(intent);
                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);
    }

    @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() {
        //Log.d(TAG,"Updating question text",new Exception());
        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.judgement_toast;
        } else {
            if (userPressedTrue == answerIsTrue) {
                messageResId = R.string.incorrect_toast;
            } else {
                messageResId = R.string.incorrect_toast;
            }
            Toast.makeText(this, messageResId, Toast.LENGTH_SHORT)
                    .show();
        }
    }

}

(2)Question

public class Question {
    private int mTextResId;
    private boolean mAnswertrue;

    public int getTextResId() {
        return mTextResId;
    }

    public void setTextResId(int textResId) {
        mTextResId = textResId;
    }

    public boolean isAnswertrue() {
        return mAnswertrue;
    }

    public void setAnswertrue(boolean answertrue) {
        mAnswertrue = answertrue;
    }

    public Question(int textResId, boolean answerTrue) {
        mTextResId = textResId;
        mAnswertrue = answerTrue;
    }
}

(3)CheatActivity

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_SHOW =
            " com.bignerdranch.android.geoquiz.answer_shown";


    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_SHOW,false);
    }

    private boolean mAnswerIsTrue;
    private TextView mAnswerTextView;
    private Button mShowAnswerButton;

    @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);
        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);
                }
                setAnswerShownResult(true);
            }
        });
    }

    private void setAnswerShownResult(boolean isAnswerShown) {
        Intent data = new Intent();
        data.putExtra(EXTRA_ANSWER_SHOW, isAnswerShown);
        setResult(RESULT_OK, data);
    }
}

(4)Crime

public class Crime {
    private UUID mId;
    private String mTitle;
    private Date mDate;
    private boolean mSolved;

    public Crime() {
        mId = UUID.randomUUID();
        mDate = new Date();
    }

    public UUID getId() {
        return mId;
    }

    public void setId(UUID id) {
        mId = id;
    }

    public String getTitle() {
        return mTitle;
    }

    public void setTitle(String title) {
        mTitle = title;
    }

    public Date getDate() {
        return mDate;
    }

    public void setDate(Date date) {
        mDate = date;
    }

    public boolean isSolved() {
        return mSolved;
    }

    public void setSolved(boolean solved) {
        mSolved = solved;
    }
}

(5)crimeActivity

public class CrimeActivity extends SingleFragmentActivity {

    //    @Override
//    protected void onCreate(Bundle savedInstanceState) {
//        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_fragment);
//        FragmentManager fm=getSupportFragmentManager();
//        Fragment fragment =fm.findFragmentById(R.id.fragment_container);
//        if(fragment==null){
//            fragment=new CrimeFragment();
//            fm.beginTransaction()
//                    .add(R.id.fragment_container,fragment)
//                    .commit();
//        }
//    }
    @Override
    protected Fragment createFragment() {
        return new CrimeFragment();
    }
}

(6)CrimeFragment

public class CrimeFragment extends Fragment {
    private Crime mCrime;
    private EditText mTitleField;
    private Button mDataButton;
    private CheckBox mSolvedCheckBox;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mCrime = new Crime();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_crime, container, false);
        mTitleField = (EditText) v.findViewById(R.id.crime_title);
        mTitleField.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                //This space intentionally left blank
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
//This one too
            }
        });
        mDataButton = (Button) v.findViewById(R.id.crime_date);
        mDataButton.setText(mCrime.getDate().toString());
        mDataButton.setEnabled(false);
        mSolvedCheckBox = (CheckBox) v.findViewById(R.id.crime_solved);
        mSolvedCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                mCrime.setSolved(isChecked);
            }
        });

        return v;
    }

}

(7)CrimeLab

public class CrimeLab {
    private static CrimeLab sCrimeLab;
    private List<Crime> mCrimes;

    public CrimeLab(Context context) {
        mCrimes = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            Crime crime = new Crime();
            crime.setTitle("Crime#" + i);
            crime.setSolved(i % 2 == 0);//Every other one
            mCrimes.add(crime);
        }
    }

    public List<Crime> getCrimes() {
        return mCrimes;
    }

    public Crime getCrime(UUID id) {
        for (Crime crime : mCrimes) {
            if (crime.getId().equals(id)) {
                return crime;
            }
        }
        return null;
    }

    public static CrimeLab get(Context context) {
        if (sCrimeLab == null) {
            sCrimeLab = new CrimeLab(context);
        }
        return sCrimeLab;
    }
}

(8)crimeListActivity

public class CrimeListActivity extends SingleFragmentActivity {
    @Override
    protected Fragment createFragment() {
        return new CrimeListFragment();
    }
}

(9)CrimeListFragment

public class CrimeListFragment extends Fragment {
    //Nothing yet
    private class CrimeHolder extends RecyclerView.ViewHolder
            implements View.OnClickListener {
        private TextView mTitleTextView;
        private TextView mDateTextView;
        private Crime mCrime;

        public void bind(Crime crime) {
            mCrime = crime;
            mTitleTextView.setText(mCrime.getTitle());
            mDateTextView.setText(mCrime.getDate().toString());

        }

        public CrimeHolder(LayoutInflater inflater, ViewGroup parent) {
            super(inflater.inflate(R.layout.list_item_crime, parent, false));
            itemView.setOnClickListener(this);
            mTitleTextView = (TextView) itemView.findViewById(R.id.crime_title);
            mDateTextView = (TextView) itemView.findViewById(R.id.crime_date);
        }

        @Override
        public void onClick(View v) {
            Toast.makeText(getActivity(),
                    mCrime.getTitle() + "clicked", Toast.LENGTH_SHORT)
                    .show();
        }
    }

    private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> {
        private List<Crime> mCrimes;

        public CrimeAdapter(List<Crime> crimes) {
            mCrimes = crimes;
        }


        @Override
        public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
            return new CrimeHolder(layoutInflater, parent);
        }

        @Override
        public void onBindViewHolder(CrimeHolder holder, int position) {
            Crime crime = mCrimes.get(position);
            holder.bind(crime);
        }

        @Override
        public int getItemCount() {
            return mCrimes.size();
        }
    }

    private RecyclerView mCrimeRecyclerView;
    private CrimeAdapter mAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_crime_list, container, false);
        mCrimeRecyclerView = (RecyclerView) view
                .findViewById(R.id.crime_recycler_view);
        mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        updateUI();
        return view;
    }

    private void updateUI() {
        CrimeLab crimeLab = CrimeLab.get(getActivity());
        List<Crime> crimes = crimeLab.getCrimes();
        mAdapter = new CrimeAdapter(crimes);
        mCrimeRecyclerView.setAdapter(mAdapter);
    }
}

(10)SingleFragmentActivity

public abstract class SingleFragmentActivity extends AppCompatActivity {
    protected abstract Fragment createFragment();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragment_container);
        if (fragment == null) {
            fragment = createFragment();
            fm.beginTransaction()
                    .add(R.id.fragment_container, fragment)
                    .commit();
        }
    }
}

2.总结

通过这两周的学习，对于安卓的基本开发流程有了初步的了解。收获了很多，

尤其是养成了遇到问题时（运行错误）能冷静考虑去不断运行测试代码来一个

个的解决问题，但是能力有限，并不是所以的问题都能得到有效的解决，在接

下来的阶段里有待提高。