回答編集履歴
3
バグ修正
test
CHANGED
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@@ -28,7 +28,9 @@
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|
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28
28
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29
29
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String str2 = editText2.getText().toString();
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30
30
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31
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-
BigDecimal a
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31
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+
BigDecimal a = null;
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32
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+
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33
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+
BigDecimal b = null;
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32
34
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33
35
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try{
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34
36
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2
バグ修正
test
CHANGED
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@@ -28,23 +28,29 @@
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28
28
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29
29
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String str2 = editText2.getText().toString();
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30
30
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31
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+
BigDecimal a,b;
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32
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+
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|
31
33
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try{
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32
34
|
|
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33
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-
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35
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+
a = new BigDecimal(str1);
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34
36
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35
37
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}catch(NumberFormatException e){
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36
38
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37
39
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Toast.makeText(this, "error", Toast.LENGTH_LONG).show();//もっといいメッセージがあるはず
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38
40
|
|
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41
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+
return;
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42
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+
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39
43
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}
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|
40
44
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|
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41
45
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try{
|
|
42
46
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|
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43
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-
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47
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+
b = new BigDecimal(str2);
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44
48
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|
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45
49
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}catch(NumberFormatException e){
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46
50
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47
51
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Toast.makeText(this, "error", Toast.LENGTH_LONG).show();//こっちも
|
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52
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+
|
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53
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+
return;
|
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48
54
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|
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49
55
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}
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50
56
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1
コード追加
test
CHANGED
|
@@ -5,3 +5,75 @@
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5
5
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(str2もですが)
|
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6
6
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7
7
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なので処理できない値がユーザーによって入力されても大丈夫なように例外処理するべきです
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8
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+
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9
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+
```java
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10
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+
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11
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+
@Override public void onClick(View v) {
|
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12
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+
|
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13
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+
/*Intent intent = new Intent(this, SecondActivity.class);
|
|
14
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+
|
|
15
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+
intent.putExtra("VALUE1", 10.5);
|
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16
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+
|
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17
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+
intent.putExtra("VALUE2", 2.5);
|
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18
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+
|
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19
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+
startActivity(intent);*/
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20
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+
|
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21
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+
EditText editText1 = (EditText)findViewById(R.id.editText1);
|
|
22
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+
|
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23
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+
EditText editText2 = (EditText)findViewById(R.id.editText2);
|
|
24
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+
|
|
25
|
+
TextView textView1 = (TextView)findViewById(R.id.textView1);
|
|
26
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+
|
|
27
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+
String str1 = editText1.getText().toString();
|
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28
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+
|
|
29
|
+
String str2 = editText2.getText().toString();
|
|
30
|
+
|
|
31
|
+
try{
|
|
32
|
+
|
|
33
|
+
BigDecimal a = new BigDecimal(str1);
|
|
34
|
+
|
|
35
|
+
}catch(NumberFormatException e){
|
|
36
|
+
|
|
37
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+
Toast.makeText(this, "error", Toast.LENGTH_LONG).show();//もっといいメッセージがあるはず
|
|
38
|
+
|
|
39
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+
}
|
|
40
|
+
|
|
41
|
+
try{
|
|
42
|
+
|
|
43
|
+
BigDecimal b = new BigDecimal(str2);
|
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44
|
+
|
|
45
|
+
}catch(NumberFormatException e){
|
|
46
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+
|
|
47
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+
Toast.makeText(this, "error", Toast.LENGTH_LONG).show();//こっちも
|
|
48
|
+
|
|
49
|
+
}
|
|
50
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+
|
|
51
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+
if(v.getId() == R.id.button1){
|
|
52
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+
|
|
53
|
+
BigDecimal c = a.add(b);
|
|
54
|
+
|
|
55
|
+
textView1.setText(String.valueOf(c));
|
|
56
|
+
|
|
57
|
+
}else if(v.getId() == R.id.button2){
|
|
58
|
+
|
|
59
|
+
BigDecimal c = a.subtract(b);
|
|
60
|
+
|
|
61
|
+
textView1.setText(String.valueOf(c));
|
|
62
|
+
|
|
63
|
+
}else if(v.getId() == R.id.button3){
|
|
64
|
+
|
|
65
|
+
BigDecimal c = a.multiply(b);
|
|
66
|
+
|
|
67
|
+
textView1.setText(String.valueOf(c));
|
|
68
|
+
|
|
69
|
+
}else if(v.getId() == R.id.button4){
|
|
70
|
+
|
|
71
|
+
BigDecimal c = a.divide(b,2, BigDecimal.ROUND_HALF_UP);
|
|
72
|
+
|
|
73
|
+
textView1.setText(String.valueOf(c));
|
|
74
|
+
|
|
75
|
+
}
|
|
76
|
+
|
|
77
|
+
}
|
|
78
|
+
|
|
79
|
+
```
|