android studio实现简单的计算器（无bug）

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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 android:background="@drawable/jsj1">
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="计算器"
 android:textSize="20dp"
 android:gravity="center"
 android:textColor="#EE4000"/>
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="输入数字"/>
 <EditText
 android:id="@+id/ET001"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"/>
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="运算结果"/>
 <EditText
 android:id="@+id/ET002"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"/>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
 <Button
  android:layout_marginLeft="5dp"
  android:id="@+id/btn001"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="C"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>
 <Button
  android:id="@+id/btn002"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="÷"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>

 <Button
  android:id="@+id/btn003"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="×"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>
 <Button
  android:id="@+id/btn004"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="Cx"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
 <Button
  android:layout_marginLeft="5dp"
  android:id="@+id/btn005"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="7"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn006"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="8"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn007"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="9"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn008"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="-"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
 <Button
  android:layout_marginLeft="5dp"
  android:id="@+id/btn009"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="4"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0010"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="5"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0011"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="6"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0012"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="+"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>

 </LinearLayout>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
 <Button
  android:layout_marginLeft="5dp"
  android:id="@+id/btn0013"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="1"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0014"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="2"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0015"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="3"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0019"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="."
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/qqqqqqqqqq"/>

 </LinearLayout>

 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal">
 <Button
  android:layout_marginLeft="5dp"
  android:id="@+id/btn0018"
  android:layout_width="88dp"
  android:layout_height="100dp"
  android:text="0"
  android:textSize="20dp"
  android:padding="5dp"
  android:background="@drawable/sssssssssssssss"/>
 <Button
  android:id="@+id/btn0016"
  android:layout_width="265dp"
  android:layout_height="100dp"
  android:text="="
  android:textSize="20dp"
  android:padding="5dp"
  android:background="#6495ED"/>

 

 </LinearLayout>
</LinearLayout>

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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
package com.example.myzhuoye;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class JiSuanJi extends AppCompatActivity implements View.OnClickListener {
 //结果
 private EditText ET001,ET002;
 //数字0-9
 private Button btn0018, btn0013,btn0014,btn0015,btn009,btn0010,btn0011,btn005,btn006,btn007;
 //运算符,+,-,×，÷,.,=;清除,返回
 private Button btn0012,btn008,btn003,btn002,btn0019,btn0016,btn001,btn004;
 private String text = "";//保存输入的数字和符号
 private Double result = 0.0;//输出结果


 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.layout4);
 //结果
 ET001=(EditText)findViewById(R.id.ET001);
 ET002=(EditText)findViewById(R.id.ET002);
 //数字0-9
 btn0013=(Button)findViewById(R.id.btn0013);
 btn0014=(Button)findViewById(R.id.btn0014);
 btn0015=(Button)findViewById(R.id.btn0015);
 btn009=(Button)findViewById(R.id.btn009);
 btn0010=(Button)findViewById(R.id.btn0010);
 btn0011=(Button)findViewById(R.id.btn0011);
 btn005=(Button)findViewById(R.id.btn005);
 btn006=(Button)findViewById(R.id.btn006);
 btn007=(Button)findViewById(R.id.btn007);
 btn0018=(Button)findViewById(R.id.btn0018);
 //运算符
 btn004=(Button)findViewById(R.id.btn004);
 btn0012=(Button)findViewById(R.id.btn0012);
 btn008=(Button)findViewById(R.id.btn008);
 btn003=(Button)findViewById(R.id.btn003);
 btn002=(Button)findViewById(R.id.btn002);
 btn0019=(Button)findViewById(R.id.btn0019);
 btn0016=(Button)findViewById(R.id.btn0016);
 btn001=(Button)findViewById(R.id.btn001);
 //添加点击事件
 btn0013.setOnClickListener((View.OnClickListener) this);
 btn0014.setOnClickListener((View.OnClickListener) this);
 btn0015.setOnClickListener((View.OnClickListener) this);
 btn009.setOnClickListener((View.OnClickListener) this);
 btn0010.setOnClickListener((View.OnClickListener) this);

 btn0011.setOnClickListener((View.OnClickListener) this);
 btn005.setOnClickListener((View.OnClickListener) this);
 btn006.setOnClickListener((View.OnClickListener) this);
 btn007.setOnClickListener((View.OnClickListener) this);
 btn0018.setOnClickListener((View.OnClickListener) this);

 btn0012.setOnClickListener((View.OnClickListener) this);
 btn008.setOnClickListener((View.OnClickListener) this);
 btn003.setOnClickListener((View.OnClickListener) this);
 btn002.setOnClickListener((View.OnClickListener) this);
 btn0019.setOnClickListener((View.OnClickListener) this);

 btn0016.setOnClickListener((View.OnClickListener) this);
 btn001.setOnClickListener((View.OnClickListener) this);
 btn004.setOnClickListener((View.OnClickListener) this);
 }

 @Override
 public void onClick(View v) {
 String string=ET001.getText().toString();
 switch (v.getId()){
  case R.id.btn0018://0
  num(0);
  break;
  case R.id.btn0013://1
  num(1);
  break;
  case R.id.btn0014://2
  num(2);
  break;
  case R.id.btn0015://3
  num(3);
  break;
  case R.id.btn009://4
  num(4);
  break;
  case R.id.btn0010://5
  num(5);
  break;
  case R.id.btn0011://6
  num(6);
  break;
  case R.id.btn005://7
  num(7);
  break;
  case R.id.btn006://8
  num(8);
  break;
  case R.id.btn007://9
  num(9);
  break;
  case R.id.btn0019://.
  dot();
  break;
  case R.id.btn0012://+
  add();
  break;
  case R.id.btn008://-
  sub();
  break;
  case R.id.btn003://"*"
  multiply();
  break;
  case R.id.btn002://除
  divide();
  break;
  case R.id.btn001://清除
  clear();
  break;
  case R.id.btn004://返回
  back();
  break;
  //计算结果
  case R.id.btn0016://结果
  result();
  break;
  default:
  break;
 }
 ET001.setText(text);
 ET002.setText(String.valueOf(result));
 }
 private void num(int i) {
 text = text + String.valueOf(i);
 }

 private void dot() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+".";
  }else {
  text += ".";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }
 }

 private void clear() {

 text = "";
 result =0.0;
 ET001.setText("");
 ET002.setText("");

 }

 private void back() {
 if (text.length()!=0){
  String str = text.substring(0, text.length()-1);
  text = str;
 }

 ;

 }

 private void add() {
 int a=text.length();

 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"+";
  }else {
  text += "+";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void sub() {
 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"-";
  }else {
  text += "-";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void multiply() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"×";
  }else {
  text += "×";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }

 }

 private void divide() {

 int a=text.length();
 String s01="+";
 String s02="-";
 String s03="×";
 String s04="÷";
 String s05=".";
 if (a!=0) {
  String s=text.substring(a-1,a);
  String s0=text.substring(0,a-1);
  if (s01.equals(s) || s02.equals(s) || s03.equals(s) || s04.equals(s) || s05.equals(s)) {
  text = s0+"÷";
  }else {
  text += "÷";
  }
 } else {
  text = "";
  result =0.0;
  ET001.setText("");
  ET002.setText("");
 }
 }

 //计算输出结果
 private void result() {
 result = testOperation(text);
 }


 public Double testOperation(String s){
 //分割字符然后放进数组
 String s1 =s.replace("+","-");
 String[] str = s1.split("-");
 double total1=0;
 //先遍历数组，把里面的乘除结果算出来
 for(String str1:str){
  if(str1.contains("×")||str1.contains("÷")){
  double total = 0;
  for(int i =0;i<str1.length();){
   int count =1;
   a:for(int j =i+1;j<str1.length();j++){
   char c =str1.charAt(j);
   if(c=='×'||c=='÷'){
    break a;
   }else{
    count++;
   }
   }

   //将数字截取出来
   String s2 =str1.substring(i,i+count);
   double d = Double.parseDouble(s2);
   if(i==0){
   total = d;
   }else{
   char c1 = str1.charAt(i-1);
   if(c1=='×'){
    total*=d;
   }else if(c1=='÷'){
    //如果除数为0，直接返回null;
    if(d == 0)
    return null;
    total/=d;
   }
   }
   i+=count+1;
  }
  s= s.replace(str1, total+"");
  }
 }
 //进行加减运算
 for(int i =0;i<s.length();i++){
  int count =1;
  a:for(int j=i+1;j<s.length();j++){
  char c = s.charAt(j);
  if(c=='+'||c=='-'){
   break a;
  }else{
   count++;
  }
  }
  String s3= s.substring(i,i+count);
  double d2 = Double.parseDouble(s3);
  if(i==0){
  total1 = d2;
  }else{
  char c = s.charAt(i-1);
  if(c=='+'){
   total1+=d2;
  }else if(c=='-'){
   total1-=d2;
  }
  }
  i+=count;
 }
 return total1;
 }

}

1
2
3
4
5
6
7
8
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
 <gradient android:startColor="#c0000000" android:endColor="#c0000000" android:angle="90" /><!--背景颜色渐变 angle为渐变角度-->
 <solid android:color=" #8DEEEE" /><!-- 背景填充颜色 -->
 <stroke android:width="0.5dp" android:color="#ff000000" /><!-- 描边，边框宽度、颜色 -->
 <corners android:radius="0dp" /><!-- 边角圆弧的半径 -->
 <padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" /><!-- 四周留出来的空白 -->
</shape>

1
2
3
4
5
6
7
8
9
<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#c0000000" android:endColor="#c0000000" android:angle="90" /><!--背景颜色渐变 angle为渐变角度-->
<solid android:color="#00FFFF" /><!-- 背景填充颜色 -->
<stroke android:width="0.5dp" android:color="#ff000000" /><!-- 描边，边框宽度、颜色 -->
<corners android:radius="0dp" /><!-- 边角圆弧的半径 -->
<padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" /><!-- 四周留出来的空白 -->
</shape>