本文实例为大家分享了Android studio实现加法软件的具体代码,供大家参考,具体内容如下
布局为简单的线性布局,用一个EditText来接收输入的结果
用Random来获得两个随机数
布局文件:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:app = "http://schemas.android.com/apk/res-auto" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".jiafa_2_28Activity" android:orientation = "vertical" android:gravity = "center_horizontal" > < TextView android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "30以内的加法" android:textSize = "30sp" android:textColor = "#000" /> < EditText android:id = "@+id/et_1" android:layout_width = "200dp" android:layout_height = "wrap_content" android:textSize = "25sp" android:layout_marginTop = "10dp" android:enabled = "false" android:textColor = "#000" android:gravity = "center" /> < EditText android:id = "@+id/et_2" android:layout_width = "200dp" android:layout_height = "wrap_content" android:textSize = "25sp" android:enabled = "false" android:layout_marginTop = "10dp" android:textColor = "#000" android:gravity = "center" /> < EditText android:id = "@+id/et_3" android:layout_width = "150dp" android:layout_height = "wrap_content" android:textSize = "25sp" android:textColor = "#000" android:text = "" android:gravity = "center" /> < LinearLayout android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "horizontal" android:gravity = "center_horizontal" > < Button android:id = "@+id/btn_1" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "运算结果" android:textSize = "30sp" /> < Button android:id = "@+id/btn_2" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "下一题" android:textSize = "30sp" android:layout_marginLeft = "30dp" /> </ LinearLayout > </ LinearLayout > |
总代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
public class jiafa_2_28Activity extends AppCompatActivity implements View.OnClickListener { private Button mBtn1,mBtn2; private EditText mEdit1,mEdit2,mEdit3; private Random mRandom; private int x,y; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_jiafa_2_28); mBtn1=findViewById(R.id.btn_1); mBtn2=findViewById(R.id.btn_2); mEdit1=findViewById(R.id.et_1); mEdit2=findViewById(R.id.et_2); mEdit3=findViewById(R.id.et_3); mBtn1.setOnClickListener( this ); mBtn2.setOnClickListener( this ); mRandom= new Random(); myRandom(); mEdit3.requestFocus(); } private void myRandom(){ x=mRandom.nextInt( 30 )+ 1 ; y=mRandom.nextInt( 30 )+ 1 ; mEdit1.setText(String.valueOf(x)); mEdit2.setText(String.valueOf(y)); } @Override public void onClick(View v) { String dite3=mEdit3.getText().toString(); Pattern pattern=Pattern.compile( "[0-9]*" ); Matcher matcher=pattern.matcher(dite3); switch (v.getId()) { case R.id.btn_1: if (matcher.matches()){ if ( "" .equals(dite3)){ Toast.makeText(jiafa_2_28Activity. this , "请输入答案" ,Toast.LENGTH_SHORT).show(); mEdit3.requestFocus(); } else { int result = Integer.parseInt(dite3); if (result == x + y) { Toast.makeText(jiafa_2_28Activity. this , "恭喜你,回答正确" , Toast.LENGTH_SHORT).show(); } else { Toast.makeText(jiafa_2_28Activity. this , "回答错误" , Toast.LENGTH_SHORT).show(); mEdit3.setText( "" ); } } } else { Toast.makeText(jiafa_2_28Activity. this , "输入的是非整数" ,Toast.LENGTH_SHORT).show(); mEdit3.requestFocus(); } break ; case R.id.btn_2: mEdit3.setText( "" ); myRandom(); break ; } } } |
代码文件①
定义属性,再依次获取个控件的Id
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
private Button mBtn1,mBtn2; private EditText mEdit1,mEdit2,mEdit3; private Random mRandom; private int x,y; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_jiafa_2_28); mBtn1=findViewById(R.id.btn_1); mBtn2=findViewById(R.id.btn_2); mEdit1=findViewById(R.id.et_1); mEdit2=findViewById(R.id.et_2); mEdit3=findViewById(R.id.et_3); //通过View.OnClickListener接口来实现给按钮添加监听事件 mBtn1.setOnClickListener( this ); mBtn2.setOnClickListener( this ); mRandom= new Random(); myRandom(); // 默认让焦点定位到mEdit3空间上 mEdit3.requestFocus(); } |
代码文件②
定义一个获得随机数的方法,给mEdit1和mEdit2赋予1~30之间的一个随机整数
1
2
3
4
5
6
|
private void myRandom(){ x=mRandom.nextInt( 30 )+ 1 ; y=mRandom.nextInt( 30 )+ 1 ; mEdit1.setText(String.valueOf(x)); mEdit2.setText(String.valueOf(y)); } |
代码文件③
设置点击事件,并判断是否运算正确
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
//重写View.OnClickListener中的onClick方法 @Override public void onClick(View v) { //定义一个String属性的变量来接收mEdit3文本框中输入的元素 String dite3=mEdit3.getText().toString(); //通过正则表达式来判断输入的数值是否为数值类型 Pattern pattern=Pattern.compile( "[0-9]*" ); Matcher matcher=pattern.matcher(dite3); //通过switch方法判断点击的时哪个按钮 switch (v.getId()) { case R.id.btn_1: //用equals方法来判断mEdit3中的内容是否为空,若为空则弹出Toast if (matcher.matches()){ if ( "" .equals(dite3)){ Toast.makeText(jiafa_2_28Activity. this , "请输入答案" ,Toast.LENGTH_SHORT).show(); mEdit3.requestFocus(); } else { //将dite3获取到的mEdit3的值qiang'zhu强转为int型 int result = Integer.parseInt(dite3); if (result == x + y) { Toast.makeText(jiafa_2_28Activity. this , "恭喜你,回答正确" , Toast.LENGTH_SHORT).show(); } else { Toast.makeText(jiafa_2_28Activity. this , "回答错误" , Toast.LENGTH_SHORT).show(); mEdit3.setText( "" ); } } } else { Toast.makeText(jiafa_2_28Activity. this , "输入的是非整数" ,Toast.LENGTH_SHORT).show(); mEdit3.requestFocus(); } break ; case R.id.btn_2: //若点击下一题则清空mEdit3中的内容,并再调用myRandom获取随机数 mEdit3.setText( "" ); myRandom(); break ; } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_44736976/article/details/104559322