Andriod studio大作业，毕业设计

2023-09-16 06:19| 来源: 网络整理| 查看: 265

Andriod studio大作业，毕业设计------完整项目汉字小测试app

想看完整教程和成果展示关注哔哩哔哩up主: Alvin_Han233

写在前面：作者本人澳洲大学毕业，下半年再出去读研，回国隔离的时候太无聊就录了一个这个项目的demo，结果我没想到的是要代码的人还挺多。我也是百忙（我现在既工作又上学）之中抽出了点时间做的视频，写的文章。喜欢的话关注一波up (ღ( ´･ᴗ･` ))。这个app是在本人大四上学期的时候做的，隔得时间有点久，可能有些生疏。但up保证这个app的代码绝对无bug，能跑通！

1. 首先六个page，六个activity： -MainActivity就是主页； -GameActivity就进入了quiz的界面； -SettingActivity是设置难中易的界面； -TwitterActivity是点完post to 推t之后的界面； -HighscoreActivity是高分页（这里我用了一点数据库SQL语言-- 我们的作业要求）； -ResultActivity是每次玩完的得分展示。

此外每次的得分都可以post到推t上，我们需要创建一个resource folder，把Dummy（此项目用的账号）的Token，key都放进这个文件中，才能用推*这个功能。这块代码我不会发的（别打我）没经过老师允许，不能发这个。

MainActivity: 在主页中，我们可以点击跳转到setting，play，highscore页，下面的instruction用了dialog实现的。 level的设置----在settingpage中用了一个intent，再把button点击的level放进intent中，key就叫"level"，mainactivity就得到了level。

package com.example.educationalapp; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private String level; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Bundle levelData = getIntent().getExtras(); if (levelData == null) { return; } // get the level from setting page level = levelData.getString("level", "Medium"); TextView currentLevel = findViewById(R.id.CurrentLevel); currentLevel.setText(level); // update the text, display the level } // To enable the menu, in mainActivity add the following callback to inflate the menu @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main_menu, menu); return super.onCreateOptionsMenu(menu); } // go to setting page @Override public boolean onOptionsItemSelected(@NonNull MenuItem item) { if (item.getItemId() == R.id.add_item) { Intent intent = new Intent(this, SettingActivity.class); startActivity(intent); return true; } return super.onOptionsItemSelected(item); } // if clicking on play button, go to Game page public void onClickPlay(View view) { Intent intent = new Intent(MainActivity.this, GameActivity.class); intent.putExtra("level", level); setResult(RESULT_OK, intent); startActivity(intent); } // go to high score page public void onClickhs(View view) { Intent intent = new Intent(this, HighScoreActivity.class); startActivity(intent); } // show the instructions public void instructions(View v) { AlertDialog dialog = new AlertDialog.Builder(this).create(); dialog.setTitle("Instructions"); dialog.setMessage("Here is the instruction" + "\n\n>1. You need click setting button to select difficulty of the quiz" + "\n\n> 2. You have 50 seconds to finish the quiz. Once timeing up, the app will automatically display result page." + "\n\n> 3. After the quiz, you can send to twitter or not." + "\n\n> 4. Clicking high score button to show history high score."); dialog.setButton(AlertDialog.BUTTON_POSITIVE, "Dismiss", (dialog1, which) -> dialog1.dismiss()); dialog.show(); } }

SettingActivity setting activity 中用 level = button.getText().toString();来探测user按了哪个键，再把level放进intent里。

package com.example.educationalapp; import android.content.Intent; import android.os.Bundle; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.Toast; import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AppCompatActivity; public class SettingActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_setting); Button medium_btn = findViewById(R.id.medium_btn); ActionBar actionBar = getSupportActionBar(); assert actionBar != null; // set the behaviour sa same as bottom back button actionBar.setDisplayShowHomeEnabled(true); actionBar.setDisplayUseLogoEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); Intent intent = getIntent(); boolean default1 = intent.getBooleanExtra("default", false); if (default1) { // the default level is medium onClickLevel(medium_btn); } } // using the bardware "Back" button to cancel adding a new item @Override public void onBackPressed() { Toast.makeText(this, "Nothing pressed", Toast.LENGTH_SHORT).show(); super.onBackPressed(); } // if clicking a level, jump to home page public void onClickLevel(View view) { Button button = (Button) view; String level; level = button.getText().toString(); Intent intent = new Intent(SettingActivity.this, MainActivity.class); intent.putExtra("level", level); setResult(RESULT_OK, intent); startActivity(intent); } }

GameActivity 之后就是最复杂的GameActivity了

我编写（网上抄的）了一个可以产生随机且不重复的函数randomCommon 来产生0-10上的一个数。我的题库一共有30道，序号0-9是easy的题；10-19是medium的题；20-29是hard的题。如果用户按了easy，那么第一个index就是从0开始数，显示的题是0+random number；如果用户按了medium，那么第一个index就是从10开始数，显示的题是10+random number；hard同理。听懂的打1[doge]我把所有的题和答案都放进了xml中，因为老师说这样项目执行效率更高 (我虽然不知道为什么效率更高，但我知道照老师说的做分数更高)，开始的时候我是把题和答案放进了Game.java这个file中，但我后来改了。count down timer（倒计时器）我是用的andriod studio自带的倒计时器，我设置了计时器的时间间隔，一个计时多久。onFinish中，若时间到了，就跳转到ResultPage。我编写了一个updateCountDownText函数用了更新倒计时的字体，最后十秒的时候字体会变红。Question.java中getCoorectAnswer用来得到QuestionNum对应的答案；Game.java中checkCorrect用来判断我选的答案是否正确，正确的话mScore+1updateQuestion中调用两个函数：showMainImage和showRadioButtonAnswers。看名字你们也知道他们是干嘛的吧。怎么使选项也是随机的呢？？？？？我们之前写的choiceSequence又排上用场了！ .getChoice得到的是一个二维数组，先用QuestionNum规定是哪道题，再用随机产生的id来指定是哪个选项此外，本项目还有一个亮点！我这个app用了sensor。做题的时候长按屏幕就会返回home页，Android有很多gesture的包

上代码！

package com.example.educationalapp; import android.content.Intent; import android.content.res.ColorStateList; import android.graphics.Color; import android.hardware.SensorManager; import android.os.Bundle; import android.os.CountDownTimer; import android.os.SystemClock; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.ScrollView; import android.widget.TextView; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import com.squareup.seismic.ShakeDetector; import java.util.Locale; public class GameActivity extends AppCompatActivity implements ShakeDetector.Listener { private final Game game = new Game(); private static final long COUNTDOWN_IN_MILLIES = 50000; // Pre-defined time private ColorStateList textColorDefaultCd; private CountDownTimer countDownTimer; private long timeLeftInMillis; private TextView textViewCountDown; private ImageView mQuizImage; private String mAnswer; private int mScore = 0; private int mQuizNum = 1; private int QuestionNum; private int initialNum; private TextView mQuizNumView; private int index; private final Questions mQuestions = new Questions(); // mQuestion is object; Question is class private String[] mCorrectAnswer; private String[] mImage; // initialize 2-dimension string array private final String[][] mChoice = {{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"},{"a", "a", "a"}}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_game); Bundle levelData = getIntent().getExtras(); if (levelData == null) { return; } // randomize the question's sequence int[] questionSequence = randomCommon(0,11,10); // select difficulty based on clicked button String level = levelData.getString("level", "Medium"); initialNum = game.mQuestionSelect(level); // the current question number QuestionNum = initialNum + questionSequence[index] - 1; mQuizNumView = findViewById(R.id.quiznum_textview); textViewCountDown = findViewById(R.id.text_view_countedown); mQuizImage = findViewById(R.id.quiz_image); // get string resource from XML // get string from xml: mchoices, mAnswers, mImages String[] mChoices_3items = getResources().getStringArray(R.array.mChoice); mCorrectAnswer = getResources().getStringArray(R.array.mCorrectAnswer); mImage = getResources().getStringArray(R.array.mImage); // split mChoice into three choices by comma // the pass one choice array into mChoice for (int i = 0; i // Quiz logic if (game.checkCorrect(mAnswer, QuestionNum,mCorrectAnswer)) { // call the method by object displayToastCorrectAnswer(); mScore++; } else { displayToastWrongAnswer(); } SystemClock.sleep(500); int numQuestion = mQuestions.getLength(mImage) / 3 - 1; // this number is 9 always // index % 10 is the index in every 10 question; recall that QuestionNum is 0-30 if (game.checkLast(numQuestion, index % 10)) { // if approach the last quetion (call the method by object) pauseCountDown(); // jump into Result Activity Intent intent_result = new Intent(GameActivity.this, ResultActivity.class); intent_result.putExtra("totalQuestions", mQuestions.getLength(mImage) / 3); intent_result.putExtra("finalScore", mScore); startActivity(intent_result); index = 0; // initialize all into zero mQuizNum = 0; mScore = 0; } else { // if not the last question index + 1 index++; QuestionNum = initialNum + questionSequence[index] - 1; mQuizNum++; updateQuestion(); // if game reach at the last question, the app wont update display Log.i("TestRandom", String.valueOf(QuestionNum)); // it is good to include in code review } }); // sensor programming // learn from: https://developer.android.com/training/gestures/detector mQuizImage.setOnTouchListener(new View.OnTouchListener() { GestureDetector gestureDetector = new GestureDetector(getApplicationContext(), new GestureDetector.SimpleOnGestureListener() { @Override public void onLongPress(MotionEvent e) { pauseCountDown(); Intent intent_home = new Intent(GameActivity.this, MainActivity.class); // Long press to go to home page startActivity(intent_home); super.onLongPress(e); } }); @Override public boolean onTouch(View v, MotionEvent event) { gestureDetector.onTouchEvent(event); return false; } }); } // generate random and unique integer array, range from 1-10 (minus 1 later) public static int[] randomCommon(int min, int max, int n){ int[] result = new int[n]; int count = 0; while(count // if the generated integer is not inside the list, append it into list if(num == result[j]){ flag = false; break; } } if(flag){ result[count] = num; count++; } } return result; } // implement shakeListener // android studio is not sensitive, you have to shake it very very very strong to see the result @Override public void hearShake() { Toast.makeText(getApplicationContext(), "The answer is " + mQuestions.getCoorectAnswer(mCorrectAnswer,QuestionNum), Toast.LENGTH_SHORT).show(); // shake to show the answer } // clock pause function private void pauseCountDown() { countDownTimer.cancel(); } // startDown(method) private void startCountDown() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { // the first parameter is the limitation of countdown; the second parameter is the time interval @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; // assign the boundary updateCountDownText(); } @Override public void onFinish() { // if time up, jump to other activity and stop the clock timeLeftInMillis = 0; updateCountDownText(); Toast.makeText(GameActivity.this, "Times up", Toast.LENGTH_LONG).show(); // if times up jump into result page and while store the result Intent intent_result = new Intent(GameActivity.this, ResultActivity.class); intent_result.putExtra("totalQuestions", mQuestions.getLength(mImage) / 3); intent_result.putExtra("finalScore", mScore); startActivity(intent_result); SystemClock.sleep(500); } }.start(); //start countdown immediately once creating it. } // this method is used to update count down timer private void updateCountDownText() { int minutes = (int) (timeLeftInMillis / 1000) / 60; // this is minutes int seconds = (int) (timeLeftInMillis / 1000) % 60; // this is seconds String timeFormatted = String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds); textViewCountDown.setText(timeFormatted); // update the text if (timeLeftInMillis textViewCountDown.setTextColor(textColorDefaultCd); } } // 2 methods below to show if answer is correct or not private void displayToastCorrectAnswer() { Toast.makeText(GameActivity.this, "Perfect!", Toast.LENGTH_SHORT).show(); } private void displayToastWrongAnswer() { Toast.makeText(GameActivity.this, "Oh nooo!", Toast.LENGTH_SHORT).show(); } // method to update the display private void updateQuestion() { LinearLayout answer_layout = findViewById(R.id.answer_layout); answer_layout.removeAllViews(); // before view the new question we need remove the old questions mAnswer = ""; mQuizNumView.setText(mQuizNum + "/" + mQuestions.getLength(mImage) / 3); // display the number of current quiz showRadioButtonAnswers(QuestionNum); // call the defined function to update the answers showMainImage(); // display chinese character ScrollView sv = findViewById(R.id.scrollView); sv.smoothScrollTo(0, 0); } // method to show the image private void showMainImage() { String img = mQuestions.getImage(mImage,QuestionNum); // get the image names mQuizImage.setImageResource(getResources().getIdentifier(img, "drawable", getPackageName())); // display the characters } // method to show radio button answers private void showRadioButtonAnswers(int qnum) { int choiceIndex; final LinearLayout answerLayout = findViewById(R.id.answer_layout); RadioGroup rg = new RadioGroup(this); rg.setOrientation(RadioGroup.VERTICAL); LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, // HEIGHT LinearLayout.LayoutParams.WRAP_CONTENT // WIDTH ); rg.setLayoutParams(lp); rg.setPadding(0, 0, 0, 0); // to ensure the choices are in the center final RadioButton[] rb1 = new RadioButton[3]; // create a RadioButton array, 3 value button int[] choiceSequence = randomCommon(0,4,3); // randomize the question's sequence, generate a random choice sequence for (int i = 0; i id = choiceSequence[id] - 1; // here is my very very smart move!!! specify the id into random consequence mAnswer = mQuestions.getChoice(mChoice,QuestionNum)[id]; }); answerLayout.addView(rg); //the method make layout add to linear } // if hardware press the back button, stop the watch. @Override protected void onPause() { super.onPause(); pauseCountDown(); } }

这篇文章就这么多了，大家喜欢的话，三联一波，咱们下篇再见！

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