回答編集履歴
4
コードバグ修正
test
CHANGED
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@@ -94,12 +94,12 @@
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94
94
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private final List<Member> memberList = new ArrayList<>();
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95
95
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96
96
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void addMember(@DrawableRes int id, String name) {
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97
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+
int position = dummyList.size() + memberList.size() / 2;
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97
98
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memberList.add(new Member(id, name));
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98
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-
int position = dummyList.size() + memberList.size() / 2;
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99
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-
if(memberList.size() % 2 ==
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99
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+
if(memberList.size() % 2 == 1) {
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notifyItemInserted(position);
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101
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+
} else {
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100
102
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notifyItemChanged(position);
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101
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-
} else {
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102
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-
notifyItemInserted(position);
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103
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}
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104
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}
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105
105
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3
コード誤字等
test
CHANGED
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@@ -48,8 +48,8 @@
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48
48
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*/
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49
49
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private static class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
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50
50
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private static abstract class ViewHolder extends RecyclerView.ViewHolder {
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51
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-
ViewHolder(@NonNull ViewGroup parent, @LayoutRes int re
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51
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+
ViewHolder(@NonNull ViewGroup parent, @LayoutRes int resource) {
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52
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-
super(LayoutInflater.from(parent.getContext()).inflate(re
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+
super(LayoutInflater.from(parent.getContext()).inflate(resource, parent, false));
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53
53
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}
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54
54
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abstract void bind(int position);
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55
55
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}
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@@ -143,7 +143,7 @@
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143
143
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case 0: return new DummyViewHolder(parent);
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144
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case 1: return new MemberViewHolder(parent);
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145
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}
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146
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-
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146
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+
throw new IllegalArgumentException("viewType=" + viewType);
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147
147
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}
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148
148
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149
149
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@Override
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2
コード等変更
test
CHANGED
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@@ -1,39 +1,249 @@
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1
1
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少なくとも、 GridView は自前でスクロールしますので ScrollView は必要ありません。
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2
2
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3
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+
---
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4
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+
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5
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+
500dp に当たる ( 仮に Dummy) 部分と、 GridView 的に 2 列で画像を表示する Member 部分を含めて全体がスクロールするような構造を RecyclerView で作ってみます。
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6
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+
Dummy 部分はテキトウにテキスト2行のデータとしています。
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7
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+
文字列から画像リソースIDを求める処理は関係無いので直接書いています。
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8
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+
```java
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9
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+
import androidx.annotation.*;
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10
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+
import androidx.appcompat.app.AppCompatActivity;
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11
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+
import androidx.recyclerview.widget.RecyclerView;
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12
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+
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13
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+
import android.os.Bundle;
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14
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+
import android.view.*;
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15
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+
import android.widget.*;
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16
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+
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17
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+
import java.util.ArrayList;
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18
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+
import java.util.List;
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19
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+
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20
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+
public class MainActivity extends AppCompatActivity {
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21
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+
@Override
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22
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+
protected void onCreate(Bundle savedInstanceState) {
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23
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+
super.onCreate(savedInstanceState);
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24
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+
setContentView(R.layout.activity_main);
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25
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+
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26
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+
RecyclerAdapter adapter = new RecyclerAdapter();
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27
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+
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28
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+
adapter.addDummy("Aaa", "111-1");
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29
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+
adapter.addDummy("Bbb", "222-22");
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30
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+
adapter.addDummy("Ccc", "333-333");
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31
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+
adapter.addDummy("Ddd", "444-4444");
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32
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+
adapter.addDummy("Eee", "555-55555");
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33
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+
adapter.addDummy("Fff", "666-666666");
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34
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+
adapter.addDummy("Ggg", "777-7777777");
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35
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+
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36
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+
adapter.addMember(R.drawable.sake, "酒");
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37
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+
adapter.addMember(R.drawable.store, "店");
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38
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+
adapter.addMember(R.drawable.group, "グループ");
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39
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+
adapter.addMember(R.drawable.group, "グループ２");
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40
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+
adapter.addMember(R.drawable.sample, "サンプル");
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41
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+
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42
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+
RecyclerView recyclerview = findViewById(R.id.recycler_view);
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43
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+
recyclerview.setAdapter(adapter);
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44
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+
}
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45
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+
|
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46
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+
/**
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47
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+
* Dummy (1行1件)・ Member (1行2件)を表示するアダプタ.
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48
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+
*/
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49
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+
private static class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
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50
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+
private static abstract class ViewHolder extends RecyclerView.ViewHolder {
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51
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+
ViewHolder(@NonNull ViewGroup parent, @LayoutRes int recource) {
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52
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+
super(LayoutInflater.from(parent.getContext()).inflate(recource, parent, false));
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53
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+
}
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54
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+
abstract void bind(int position);
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55
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+
}
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56
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+
|
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57
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+
private static class Dummy {
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|
58
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+
final String text1, text2;
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59
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+
Dummy(String text1, String text2) {
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60
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+
this.text1 = text1;
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61
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+
this.text2 = text2;
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62
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+
}
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63
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+
}
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|
64
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+
private final List<Dummy> dummyList = new ArrayList<>();
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65
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+
|
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66
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+
void addDummy(String text1, String text2) {
|
|
67
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+
dummyList.add(new Dummy(text1, text2));
|
|
68
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+
notifyItemInserted(dummyList.size() - 1);
|
|
69
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+
}
|
|
70
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+
|
|
71
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+
private class DummyViewHolder extends ViewHolder {
|
|
72
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+
private final TextView text1, text2;
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|
73
|
+
DummyViewHolder(@NonNull ViewGroup parent) {
|
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74
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+
super(parent, R.layout.dummy_row);
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75
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+
text1 = itemView.findViewById(R.id.name1);
|
|
76
|
+
text2 = itemView.findViewById(R.id.name2);
|
|
77
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+
}
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|
78
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+
@Override
|
|
79
|
+
void bind(int position) {
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|
80
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+
Dummy dummy = dummyList.get(position);
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|
81
|
+
text1.setText(dummy.text1);
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|
82
|
+
text2.setText(dummy.text2);
|
|
83
|
+
}
|
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84
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+
}
|
|
85
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+
|
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86
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+
private static class Member {
|
|
87
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+
final @DrawableRes int id;
|
|
88
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+
final String name;
|
|
89
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+
Member(@DrawableRes int id, String name) {
|
|
90
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+
this.id = id;
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|
91
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+
this.name = name;
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92
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+
}
|
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93
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+
}
|
|
94
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+
private final List<Member> memberList = new ArrayList<>();
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95
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+
|
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96
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+
void addMember(@DrawableRes int id, String name) {
|
|
97
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+
memberList.add(new Member(id, name));
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98
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+
int position = dummyList.size() + memberList.size() / 2;
|
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99
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+
if(memberList.size() % 2 == 0) {
|
|
100
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+
notifyItemChanged(position);
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101
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+
} else {
|
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102
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+
notifyItemInserted(position);
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103
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+
}
|
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104
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+
}
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105
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+
|
|
106
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+
private class MemberViewHolder extends ViewHolder {
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107
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+
private final ImageView image1, image2;
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108
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+
private final TextView name1, name2;
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109
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+
MemberViewHolder(@NonNull ViewGroup parent) {
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110
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+
super(parent, R.layout.member_row);
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|
111
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+
image1 = itemView.findViewById(R.id.image1);
|
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112
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+
image2 = itemView.findViewById(R.id.image2);
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|
113
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+
name1 = itemView.findViewById(R.id.name1);
|
|
114
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+
name2 = itemView.findViewById(R.id.name2);
|
|
115
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+
}
|
|
116
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+
@Override
|
|
117
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+
void bind(int position) {
|
|
118
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+
int index = (position - dummyList.size()) * 2;
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119
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+
Member member = memberList.get(index);
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|
120
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+
image1.setImageResource(member.id);
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|
121
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+
name1.setText(member.name);
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122
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+
|
|
123
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+
if(++index < memberList.size()) {
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124
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+
member = memberList.get(index);
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|
125
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+
image2.setImageResource(member.id);
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|
126
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+
name2.setText(member.name);
|
|
127
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+
} else {
|
|
128
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+
image2.setImageResource(0);
|
|
129
|
+
name2.setText("");
|
|
130
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+
}
|
|
131
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+
}
|
|
132
|
+
}
|
|
133
|
+
|
|
134
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+
@Override
|
|
135
|
+
public int getItemViewType(int position) {
|
|
136
|
+
return position < dummyList.size() ? 0 : 1;
|
|
137
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+
}
|
|
138
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+
|
|
139
|
+
@NonNull
|
|
140
|
+
@Override
|
|
141
|
+
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
|
|
142
|
+
switch(viewType) {
|
|
143
|
+
case 0: return new DummyViewHolder(parent);
|
|
144
|
+
case 1: return new MemberViewHolder(parent);
|
|
145
|
+
}
|
|
146
|
+
return null;
|
|
147
|
+
}
|
|
148
|
+
|
|
149
|
+
@Override
|
|
150
|
+
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
|
|
151
|
+
holder.bind(position);
|
|
152
|
+
}
|
|
153
|
+
|
|
154
|
+
@Override
|
|
155
|
+
public int getItemCount() {
|
|
156
|
+
return dummyList.size() + (memberList.size() + 1) / 2;
|
|
157
|
+
}
|
|
158
|
+
}
|
|
159
|
+
}
|
|
160
|
+
```
|
|
161
|
+
res/layout/activity_main.xml
|
|
162
|
+
```xml
|
|
163
|
+
<?xml version="1.0" encoding="utf-8"?>
|
|
164
|
+
<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
|
|
165
|
+
xmlns:tools="http://schemas.android.com/tools"
|
|
166
|
+
xmlns:app="http://schemas.android.com/apk/res-auto"
|
|
167
|
+
android:id="@+id/recycler_view"
|
|
168
|
+
android:layout_width="match_parent"
|
|
169
|
+
android:layout_height="match_parent"
|
|
170
|
+
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
|
|
171
|
+
tools:context=".MainActivity" />
|
|
172
|
+
```
|
|
173
|
+
res/layout/dummy_row.xml
|
|
3
174
|
```xml
|
|
4
175
|
<?xml version="1.0" encoding="utf-8"?>
|
|
5
176
|
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
|
6
177
|
xmlns:app="http://schemas.android.com/apk/res-auto"
|
|
7
|
-
xmlns:tools="http://schemas.android.com/tools"
|
|
8
178
|
android:layout_width="match_parent"
|
|
9
|
-
android:layout_height="
|
|
179
|
+
android:layout_height="wrap_content"
|
|
10
|
-
|
|
180
|
+
android:padding="3dp">
|
|
181
|
+
|
|
11
|
-
|
|
182
|
+
<TextView
|
|
12
|
-
|
|
183
|
+
android:id="@+id/name1"
|
|
13
|
-
android:layout_width="0dp"
|
|
184
|
+
android:layout_width="0dp"
|
|
14
|
-
android:layout_height="
|
|
185
|
+
android:layout_height="wrap_content"
|
|
15
|
-
android:
|
|
186
|
+
android:textSize="30dp"
|
|
16
|
-
app:layout_constraintBottom_toBottomOf="parent"
|
|
17
187
|
app:layout_constraintEnd_toEndOf="parent"
|
|
18
188
|
app:layout_constraintStart_toStartOf="parent"
|
|
19
|
-
app:layout_constraintTop_toTopOf="parent">
|
|
189
|
+
app:layout_constraintTop_toTopOf="parent" />
|
|
20
|
-
|
|
190
|
+
|
|
21
|
-
|
|
191
|
+
<TextView
|
|
22
|
-
|
|
192
|
+
android:id="@+id/name2"
|
|
23
|
-
|
|
193
|
+
android:layout_width="0dp"
|
|
24
|
-
|
|
194
|
+
android:layout_height="wrap_content"
|
|
25
|
-
android:gravity="center"
|
|
26
|
-
android:horizontalSpacing="1dp"
|
|
27
|
-
android:numColumns="2"
|
|
28
|
-
android:stretchMode="columnWidth"
|
|
29
|
-
|
|
195
|
+
android:textAlignment="textEnd"
|
|
30
|
-
app:layout_constraintBottom_toBottomOf="parent"
|
|
31
|
-
|
|
196
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
32
|
-
|
|
197
|
+
app:layout_constraintStart_toStartOf="parent"
|
|
33
|
-
|
|
198
|
+
app:layout_constraintTop_toBottomOf="@id/name1" />
|
|
34
|
-
|
|
35
|
-
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
36
|
-
|
|
37
199
|
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
38
200
|
```
|
|
201
|
+
res/layout/member_row.xml
|
|
202
|
+
```xml
|
|
203
|
+
<?xml version="1.0" encoding="utf-8"?>
|
|
204
|
+
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
|
205
|
+
xmlns:app="http://schemas.android.com/apk/res-auto"
|
|
206
|
+
android:layout_width="match_parent"
|
|
207
|
+
android:layout_height="wrap_content"
|
|
208
|
+
android:padding="3dp">
|
|
209
|
+
|
|
210
|
+
<ImageView
|
|
211
|
+
android:id="@+id/image1"
|
|
212
|
+
android:layout_width="0dp"
|
|
213
|
+
android:layout_height="140dp"
|
|
214
|
+
android:scaleType="centerCrop"
|
|
215
|
+
android:layout_margin="1dp"
|
|
216
|
+
app:layout_constraintEnd_toStartOf="@id/image2"
|
|
217
|
+
app:layout_constraintStart_toStartOf="parent"
|
|
218
|
+
app:layout_constraintTop_toTopOf="parent" />
|
|
219
|
+
<TextView
|
|
220
|
+
android:id="@+id/name1"
|
|
221
|
+
android:layout_width="0dp"
|
|
222
|
+
android:layout_height="wrap_content"
|
|
223
|
+
android:layout_marginTop="8dp"
|
|
224
|
+
android:gravity="center"
|
|
225
|
+
app:layout_constraintEnd_toEndOf="@id/image1"
|
|
226
|
+
app:layout_constraintStart_toStartOf="@id/image1"
|
|
227
|
+
app:layout_constraintTop_toBottomOf="@+id/image1" />
|
|
228
|
+
|
|
229
|
+
<ImageView
|
|
230
|
+
android:id="@+id/image2"
|
|
231
|
+
android:layout_width="0dp"
|
|
232
|
+
android:layout_height="140dp"
|
|
233
|
+
android:scaleType="centerCrop"
|
|
234
|
+
android:layout_margin="1dp"
|
|
235
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
236
|
+
app:layout_constraintStart_toEndOf="@id/image1"
|
|
237
|
+
app:layout_constraintTop_toTopOf="parent" />
|
|
238
|
+
<TextView
|
|
239
|
+
android:id="@+id/name2"
|
|
240
|
+
android:layout_width="0dp"
|
|
241
|
+
android:layout_height="wrap_content"
|
|
242
|
+
android:layout_marginTop="8dp"
|
|
243
|
+
android:gravity="center"
|
|
244
|
+
app:layout_constraintEnd_toEndOf="@id/image2"
|
|
245
|
+
app:layout_constraintStart_toStartOf="@id/image2"
|
|
246
|
+
app:layout_constraintTop_toBottomOf="@+id/image2" />
|
|
247
|
+
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
248
|
+
```
|
|
39
|
-
|
1
コード・SS追加
test
CHANGED
|
@@ -1 +1,39 @@
|
|
|
1
1
|
少なくとも、 GridView は自前でスクロールしますので ScrollView は必要ありません。
|
|
2
|
+
|
|
3
|
+
```xml
|
|
4
|
+
<?xml version="1.0" encoding="utf-8"?>
|
|
5
|
+
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
|
6
|
+
xmlns:app="http://schemas.android.com/apk/res-auto"
|
|
7
|
+
xmlns:tools="http://schemas.android.com/tools"
|
|
8
|
+
android:layout_width="match_parent"
|
|
9
|
+
android:layout_height="match_parent"
|
|
10
|
+
tools:context=".MainActivity">
|
|
11
|
+
|
|
12
|
+
<androidx.constraintlayout.widget.ConstraintLayout
|
|
13
|
+
android:layout_width="0dp"
|
|
14
|
+
android:layout_height="0dp"
|
|
15
|
+
android:layout_marginTop="500dp"
|
|
16
|
+
app:layout_constraintBottom_toBottomOf="parent"
|
|
17
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
18
|
+
app:layout_constraintStart_toStartOf="parent"
|
|
19
|
+
app:layout_constraintTop_toTopOf="parent">
|
|
20
|
+
|
|
21
|
+
<GridView
|
|
22
|
+
android:id="@+id/gridview"
|
|
23
|
+
android:layout_width="0dp"
|
|
24
|
+
android:layout_height="0dp"
|
|
25
|
+
android:gravity="center"
|
|
26
|
+
android:horizontalSpacing="1dp"
|
|
27
|
+
android:numColumns="2"
|
|
28
|
+
android:stretchMode="columnWidth"
|
|
29
|
+
android:verticalSpacing="1dp"
|
|
30
|
+
app:layout_constraintBottom_toBottomOf="parent"
|
|
31
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
32
|
+
app:layout_constraintStart_toStartOf="parent"
|
|
33
|
+
app:layout_constraintTop_toTopOf="parent" />
|
|
34
|
+
|
|
35
|
+
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
36
|
+
|
|
37
|
+
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
38
|
+
```
|
|
39
|
+
|