質問編集履歴
3
title改善
test
CHANGED
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@@ -1 +1 @@
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|
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1
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-
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1
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+
listviewが表示されない
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test
CHANGED
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File without changes
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2
変更
test
CHANGED
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File without changes
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test
CHANGED
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@@ -1,34 +1,6 @@
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1
1
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javaソース
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2
2
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3
3
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```
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4
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-
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5
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-
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6
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-
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7
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-
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8
|
-
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9
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-
import android.content.Context;
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10
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-
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11
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-
import android.content.Intent;
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12
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-
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13
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-
import android.support.v7.app.AppCompatActivity;
|
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14
|
-
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15
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-
import android.os.Bundle;
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16
|
-
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17
|
-
import android.view.View;
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18
|
-
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19
|
-
import android.widget.ArrayAdapter;
|
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20
|
-
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21
|
-
import android.widget.Button;
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22
|
-
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|
23
|
-
import android.widget.ListView;
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24
|
-
|
|
25
|
-
|
|
26
|
-
|
|
27
|
-
import java.util.ArrayList;
|
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28
|
-
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29
|
-
import java.util.List;
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30
|
-
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31
|
-
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32
4
|
|
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33
5
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public class MainActivity extends AppCompatActivity implements View.OnClickListener {
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34
6
|
|
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@@ -72,9 +44,9 @@
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72
44
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73
45
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74
46
|
|
|
75
|
-
ListView listView = new ListView(this);
|
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47
|
+
// ListView listView = new ListView(this);
|
|
76
48
|
|
|
77
|
-
setContentView(list
|
|
49
|
+
// setContentView(listitem);
|
|
78
50
|
|
|
79
51
|
|
|
80
52
|
|
|
@@ -82,33 +54,9 @@
|
|
|
82
54
|
|
|
83
55
|
new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, texts);
|
|
84
56
|
|
|
57
|
+
|
|
85
58
|
|
|
86
|
-
|
|
87
|
-
list
|
|
59
|
+
listitem.setAdapter(arrayAdapter);
|
|
88
|
-
|
|
89
|
-
|
|
90
|
-
|
|
91
|
-
|
|
92
|
-
|
|
93
|
-
}
|
|
94
|
-
|
|
95
|
-
|
|
96
|
-
|
|
97
|
-
public void onClick(View v) {
|
|
98
|
-
|
|
99
|
-
|
|
100
|
-
|
|
101
|
-
if(v==newCreate){
|
|
102
|
-
|
|
103
|
-
Intent intent = new Intent(this,NewCreateActivity.class);
|
|
104
|
-
|
|
105
|
-
startActivity(intent);
|
|
106
|
-
|
|
107
|
-
}
|
|
108
|
-
|
|
109
|
-
|
|
110
|
-
|
|
111
|
-
}
|
|
112
60
|
|
|
113
61
|
```
|
|
114
62
|
|
|
@@ -198,6 +146,12 @@
|
|
|
198
146
|
|
|
199
147
|
|
|
200
148
|
|
|
201
|
-
|
|
149
|
+
実行すると
|
|
202
150
|
|
|
151
|
+
```
|
|
152
|
+
|
|
153
|
+
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)'
|
|
154
|
+
|
|
155
|
+
```
|
|
156
|
+
|
|
203
|
-
|
|
157
|
+
と言われました。何が違うのでしょうか
|
1
訂正
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -2,7 +2,7 @@
|
|
|
2
2
|
|
|
3
3
|
```
|
|
4
4
|
|
|
5
|
-
|
|
5
|
+
|
|
6
6
|
|
|
7
7
|
|
|
8
8
|
|