结对项目

18软工4班3118005096赖学程。18软工4班3118005098利国铭

需求：实现一个自动生成小学四则运算题目的命令行程序（也可以用图像界面，具有相似功能）。

分析：设置一个函数，自动生成，加减乘除，然后用，对话框形式让用户输入答案，最后用配对传输数据。

困难：写博客太难了。感觉不会再爱了。

过程：活动一：

public class MainActivity extends AppCompatActivity {
    int a;
    private SoundPool soundPool;//声明一个SoundPool
    private int soundID;//创建某个声音对应的音频ID

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final EditText myEditText=(EditText)findViewById(R.id.edittext);
        Button myButton=(Button)findViewById(R.id.bottom);
        initSound();//按钮加声音
        myButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    a=Integer.parseInt(myEditText.getText().toString());
                }catch (Exception e){
                    Toast.makeText(MainActivity.this,"请输入正确的数字",Toast.LENGTH_SHORT).show();
                }
                if(a==0)Toast.makeText(MainActivity.this,"输入0干啥",Toast.LENGTH_SHORT).show();
                if(30<a)Toast.makeText(MainActivity.this,"输入那么大干啥",Toast.LENGTH_SHORT).show();
                if(0<a&&a<31){
                    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                    intent.putExtra("lai", a);
                    startActivity(intent);

                }
            }
        });
    }
    @SuppressLint("NewApi")//按钮加声音
    private void initSound() {
        soundPool = new SoundPool.Builder().build();
        soundID = soundPool.load(this,R.raw.li, 1);
    }
    private void playSound() {//按钮加声音
        soundPool.play(
                soundID,
                0.1f, //左耳道音量【0~1】
                0.5f, //右耳道音量【0~1】
                0, //播放优先级【0表示最低优先级】
                1, //循环模式【0表示循环一次，-1表示一直循环，其他表示数字+1表示当前数字对应的循环次数】
                1 //播放速度【1是正常，范围从0~2】
        );
    }
第二个活动；

public class Main2Activity extends AppCompatActivity {
    int a=0;
    public List<String> ti=new ArrayList<String>();
    int[] di;String wu="答案";String qi="答对的题有：";
    String ai;int[] b;
    String string;int dia;
    private MediaPlayer mp;
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.aoo, menu);
        return true;
    }
    public boolean onOptionsItemSelected(MenuItem item){
        switch (item.getItemId()) {
            case R.id.a:
                att();
                Intent intent2 = new Intent(Main2Activity.this,Main4Activity.class);
                intent2.putExtra("aaa",wu);
                startActivity(intent2);
                break;
            case R.id.b:
                Intent intent = new Intent(Main2Activity.this,Main3Activity.class);
                intent.putExtra("aaa",a);
                startActivity(intent);
                break;
            case R.id.c:
                stt();
                Intent intent3 = new Intent(Main2Activity.this,Main5Activity.class);
                intent3.putExtra("aaa",qi);
                startActivity(intent3);
            default:
        }
        return true;
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Intent intent=getIntent();
        a=intent.getIntExtra("lai",0);
        b=new int[a];di=new int[a];
        initti(a);
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(Main2Activity.this,android.R.layout.simple_dropdown_item_1line,ti);
        ListView listView=(ListView) findViewById(R.id.listview);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent,View view,int position,long id){
               Toast.makeText(Main2Activity.this,"aaa",Toast.LENGTH_SHORT).show();
               ti(position);
            }
        });
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "一共"+a+"题", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
        Intent intent4 = new Intent(this,MyService.class);
        startService(intent4);
    }
    private void initti(int b){
        ti.clear();
        SharedPreferences.Editor editor=getSharedPreferences("a",Context.MODE_PRIVATE).edit();
        for (int i=1;i<=a;i++){
            Random random=new Random();
            int aa=random.nextInt(10);
            int bb=random.nextInt(10);
            int cc=random.nextInt(4);
            if(cc==0){
                string="第"+i+"道:"+aa+"+"+bb+"=";
                dia=aa+bb;
            }
            if(cc==1){
                string="第"+i+"道:"+aa+"-"+bb+"=";
                dia=aa-bb;
            }
            if(cc==2){
                string="第"+i+"道:"+aa+"×"+bb+"=";
                dia=aa*bb;
            }
            if(cc==3){
                string="第"+i+"道:"+aa+"÷"+bb+"=";
                dia=aa/bb;
            }
            ti.add(string);
            di[i-1]=dia;
            ai="第"+i+"道答案:"+dia+"   ";
            editor.putString("第"+i+"道",ai);
        }
        editor.apply();
    }
    public void ti(int h){
        final EditText et = new EditText(this);
        final int k=h+1;
        new AlertDialog.Builder(this).setTitle("请输入第"+k+"道题答案")
                .setIcon(android.R.drawable.sym_def_app_icon)
                .setView(et)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        //按下确定键后的事件
                        Toast.makeText(getApplicationContext(), et.getText().toString(),Toast.LENGTH_LONG).show();
                        try {
                            b[k-1]=Integer.parseInt(et.getText().toString());
                        }catch (Exception e){
                            Toast.makeText(Main2Activity.this,"请输入正确的数字",Toast.LENGTH_SHORT).show();
                        }

                    }
                }).setNegativeButton("取消",null).show();
    }
    public void stt(){
        for (int j=0;j<a;j++){
            if(di[j]==b[j]){
                int l=j+1;
                qi=qi+l+"，";
            }
        }
        qi=qi+"      答错的题有:";
        for (int j=0;j<a;j++){
            if(di[j]!=b[j]){
                int l=j+1;
                qi=qi+l+"，";
            }
        }
    }
    public void att(){
        for (int e=0;e<a;e++){
            int m=e+1;
            wu=wu+"第"+m+"道:"+b[e]+"  ";
        }
    }

    @Override
    protected void onDestroy(){
        super.onDestroy();
        mp.release();//背景音乐
    }

}
第三个活动：

public class Main3Activity extends AppCompatActivity {
    public List<String> diaa=new ArrayList<>();
    String alist=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Intent intent=getIntent();
        int dia=intent.getIntExtra("aaa",0);
        SharedPreferences pref=getSharedPreferences("a", Context.MODE_PRIVATE);
        for (int a=1;a<=dia;a++){
            alist=pref.getString("第"+a+"道","没收到");
            diaa.add(alist);
        }
        ArrayAdapter<String> arrayAdapter=new ArrayAdapter<String>(Main3Activity.this,android.R.layout.simple_dropdown_item_1line,diaa);
        ListView listView=(ListView) findViewById(R.id.text) ;
        listView.setAdapter(arrayAdapter);
    }

}

第四个活动

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main4);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    TextView textView=(TextView) findViewById(R.id.text1);
    Intent intent=getIntent();
    String dia=intent.getStringExtra("aaa");
    textView.setText(dia);

    FloatingActionButton fab = findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}
第五个活动

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main5);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    TextView textView=(TextView) findViewById(R.id.text2);
    Intent intent=getIntent();
    String dia=intent.getStringExtra("aaa");
    textView.setText(dia);

一个服务

public class MyService extends Service {
    private MediaPlayer mediaPlayer = null;
    private boolean isReady = false;
    @Override
    public void onCreate() {
        super.onCreate();
        mediaPlayer = MediaPlayer.create(this, R.raw.music);
        if(mediaPlayer == null){
            return;
        }
        mediaPlayer.stop();
        mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                mp.release();
                stopSelf();
                return false;
            }
        });

        try{
            mediaPlayer.prepare();
            isReady = true;
        } catch (IOException e) {
            e.printStackTrace();
            isReady = false;
        }

        if(isReady){
            mediaPlayer.setLooping(true);
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if(isReady && !mediaPlayer.isPlaying()){
            mediaPlayer.start();
            Toast.makeText(this, "开始", Toast.LENGTH_LONG).show();
        }
        return START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if(mediaPlayer != null){
            if(mediaPlayer.isPlaying()){
                mediaPlayer.stop();
            }
            mediaPlayer.release();
        }
    }
}

18软