android 100以内加减法app（一）

女爷i 2023-09-23 23:53 8阅读 0赞

![在这里插入图片描述][6765efec9bda48edaba3399b52cd3c16.png]  
![t1t1t1t1][]

## 写在前面 ##

只前没自己独立写过app，这个也没用什么框架，纯属于给家里小孩做着玩的，

## 功能 ##

进入app后，直接就是两个问号的界面  
点击开始  
出现题，后台其实写了有乘法除法，但一方面小孩还没学到乘法除法，另一方面……超100了  
写对了会有提示，  
写错了会有提示并且震动

## 部分要修正的功能或者bug ##

1.连续点击按钮会闪退  
2.结束按钮还没想好做啥  
3.数据没有持久化  
4.界面太丑了……

## 代码 ##

//声明控件
        private Button next;
        private Button exit;
    
        private TextView number1;
        private TextView number2;
        private TextView guanxi1;
        private TextView top;
    
        private EditText an;
        private String fail = "计算错误！";
        private String ok = "计算正确！";
    
    
        private int t1 = 0;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        
            super.onCreate(savedInstanceState);
            //隐藏标题栏
            getSupportActionBar().hide();
            setContentView(R.layout.activity_main);
    
            //找到控件
            next = findViewById(R.id.next);
            exit = findViewById(R.id.exit);
    
            next.setOnClickListener(this::onClick);
            exit.setOnClickListener(this::onClick2);
    
            //建立对象
            number1 = findViewById(R.id.number1);
            number2 = findViewById(R.id.number2);
            guanxi1 = findViewById(R.id.guanxi);
            an = findViewById(R.id.an);
            top = findViewById(R.id.topnum);
    
        }
    
    
        //开始按钮
        public void onClick(View view) {
        
            int math = 0;
            //获取目前数字 关系 答案
            String m1 = number1.getText().toString();//获取首位数字
            if (!isNumeric(m1)) {
        
                int n0;
                String n1 = "";
                String n2 = "";
    
                int g = (int) (Math.random() * 2);
                if (g == 0) {
        
                    guanxi1.setText("＋");
                    n0 = (int) (Math.random() * 100);
                    n1 = String.valueOf(n0);
                    n2 = String.valueOf((int) (10 + Math.random() * (90 - n0)));
                } else if (g == 1) {
        
                    guanxi1.setText("-");
                    n0 = (int) (10 + Math.random() * 90);
                    n1 = String.valueOf(n0);
                    n2 = String.valueOf((int) (10 + Math.random() * n0));
                } else if (g == 2) {
        
                    guanxi1.setText("*");
                } else if (g == 3) {
        
                    guanxi1.setText("/");
                }
                number1.setText(n1);
                number2.setText(n2);
                next.setText("下一道");
    
            } else {
        
                int n0;
                String n1 = "";
                String n2 = "";
                int num1 = Integer.parseInt(number1.getText().toString());//获取首位数字
                int num2 = Integer.parseInt(number2.getText().toString());//获取次位数字
                String gunxi = guanxi1.getText().toString();//获取关系
                int a1 = Integer.parseInt(an.getText().toString());//获取用户答案
                int t1 = Integer.parseInt(top.getText().toString());//获取top
                math = Math(num1, gunxi, num2);//系统计算
    
                if (math == a1) {
        
                    ToastUtil.showMsg(getApplicationContext(), ok);
                    String t = String.valueOf(1 + t1);
    
                    int g = (int) (Math.random() * 2);
                    if (g == 0) {
        
                        guanxi1.setText("＋");
                        n0 = (int) (Math.random() * 100);
                        n1 = String.valueOf(n0);
                        n2 = String.valueOf((int) (10 + Math.random() * (90 - n0)));
                    } else if (g == 1) {
        
                        guanxi1.setText("-");
                        n0 = (int) (10 + Math.random() * 90);
                        n1 = String.valueOf(n0);
                        n2 = String.valueOf((int) (10 + Math.random() * n0));
                    } else if (g == 2) {
        
                        guanxi1.setText("*");
                    } else if (g == 3) {
        
                        guanxi1.setText("/");
                    }
                    number1.setText(n1);
                    number2.setText(n2);
    
                    top.setText(t);
                    an.setText("");
    
    
                } else {
        
    //            ToastUtil.showMsg(getApplicationContext(),"已获取数据num1="+num1);
    //            ToastUtil.showMsg(getApplicationContext(),"已获取数据num2="+num2);
    //            ToastUtil.showMsg(getApplicationContext(),"已获取数据啊="+math);
                    playVibrate(getApplicationContext(), false);
                    ToastUtil.showMsg(getApplicationContext(), fail);
                    an.setText("");
    
    
                }
            }
    
        }
    
        //结束按钮
        public void onClick2(View view) {
        
    
        }
    
        public int Math(int num1, String ch, int num2) {
        
            int num3 = 0;
            if (ch.equals("＋")) num3 = num1 + num2;
            else if (ch.equals("-")) num3 = num1 - num2;
            else if (ch.equals("*")) num3 = num1 * num2;
            else if (ch.equals("/")) num3 = num1 / num2;
            return num3;
        }
    
        public static boolean isNumeric(String str) {
        
            for (int i = str.length(); --i >= 0; ) {
        
                if (!Character.isDigit(str.charAt(i))) {
        
                    return false;
                }
            }
            return true;
    
        }
    
        /**
         * 手机震动
         *
         * @param context
         * @param isRepeat 是否重复震动
         */
        public static void playVibrate(Context context, boolean isRepeat) {
        
    
            /*
             * 设置震动，用一个long的数组来表示震动状态（以毫秒为单位）
             * 如果要设置先震动1秒，然后停止0.5秒，再震动2秒则可设置数组为：long[]{1000, 500, 2000}。
             * 别忘了在AndroidManifest配置文件中申请震动的权限
             */
            try {
        
                Vibrator mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
                long[] patern = new long[]{
        2000, 500, 2000};
                AudioAttributes audioAttributes = null;
                /**
                 * 适配android7.0以上版本的震动
                 * 说明：如果发现5.0或6.0版本在app退到后台之后也无法震动，那么只需要改下方的Build.VERSION_CODES.N版本号即可
                 */
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        
                    audioAttributes = new AudioAttributes.Builder()
                            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                            .setUsage(AudioAttributes.USAGE_ALARM) //key
                            .build();
                    mVibrator.vibrate(patern, isRepeat ? 1 : -1, audioAttributes);
                } else {
        
                    mVibrator.vibrate(patern, isRepeat ? 1 : -1);
                }
            } catch (Exception ex) {
        
                ex.printStackTrace();
            }
        }

布局就不贴了，线性布局，纯自己写着玩，可能……有第二篇吧（如果小孩不那么气人的话……）

[6765efec9bda48edaba3399b52cd3c16.png]: https://img-blog.csdnimg.cn/6765efec9bda48edaba3399b52cd3c16.png
[t1t1t1t1]: https://img-blog.csdnimg.cn/92ccbc03d1874d55b81817f5aaf000c7.png