回答編集履歴
3
TextWatcher の登録時に先のモノを削除するように修正
test
CHANGED
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@@ -132,9 +132,13 @@
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132
132
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@Override
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133
133
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public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
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134
134
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Item item = itemList.get(position);
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135
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-
holder.editText.setTag(item);
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136
135
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holder.editText.setText(item.text);
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136
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+
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137
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+
TextWatcher validator = (TextWatcher)holder.editText.getTag();
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138
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if(validator != null) holder.editText.removeTextChangedListener(validator);
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139
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validator = new EditValidator(holder.editText, item);
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140
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+
holder.editText.setTag(validator);
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137
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-
holder.editText.addTextChangedListener(
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141
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+
holder.editText.addTextChangedListener(validator);
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138
142
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}
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139
143
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140
144
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@Override
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2
残っていた不要コードの削除
test
CHANGED
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@@ -65,11 +65,9 @@
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65
65
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66
66
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private static class ViewHolder extends RecyclerView.ViewHolder {
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67
67
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final EditText editText;
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68
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-
String text;
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69
68
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public ViewHolder(@NonNull View itemView) {
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70
69
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super(itemView);
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71
70
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editText = itemView.findViewById(R.id.editText);
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72
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-
text = editText.getText().toString();
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73
71
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}
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74
72
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}
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75
73
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1
コード追加
test
CHANGED
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@@ -1,2 +1,204 @@
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1
1
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UI そのものの動作の再検討も含めて入力検査・再入力の方法はいろいろで、これしか無いというのは無さそうに思います。
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2
2
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フォーカスが移動してしまうのがダメならフォーカスも戻すとか、逆に移動してもどこが問題なのかがはっきり分かるようにどうにかするというのも方法でしょう。
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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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+
「TextWatcher 等でバリデートチェックして EditText#setError でエラーを表示するようにしフォーカスは自由に動かせる」というイメージで仕立ててみました。
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6
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+
DB の更新は考慮していませんが、エラーがあったら SEND ボタンを disable にしています。
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7
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+
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8
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+
MainActivity.java
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9
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+
```java
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10
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+
import androidx.annotation.NonNull;
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11
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+
import androidx.appcompat.app.AppCompatActivity;
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12
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+
import androidx.recyclerview.widget.RecyclerView;
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13
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+
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14
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import android.os.*;
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15
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import android.text.*;
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16
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import android.util.Log;
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17
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import android.view.*;
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18
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import android.widget.*;
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19
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+
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20
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import java.util.*;
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21
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+
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22
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public class MainActivity extends AppCompatActivity {
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23
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@Override
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24
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protected void onCreate(Bundle savedInstanceState) {
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25
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super.onCreate(savedInstanceState);
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26
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setContentView(R.layout.activity_main);
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27
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+
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28
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Adapter adapter = new Adapter();
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29
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RecyclerView recyclerView = findViewById(R.id.recyclerView);
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30
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recyclerView.setAdapter(adapter);
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31
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+
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32
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Button cancelButton = findViewById(R.id.cancelButton);
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33
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cancelButton.setOnClickListener(v -> {
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34
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+
Log.d("MainActivity **", "cancel.");
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35
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});
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36
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+
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37
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Button sendButton = findViewById(R.id.sendButton);
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38
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sendButton.setOnClickListener(v -> {
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39
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Log.d("MainActivity **", "send.");
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40
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});
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41
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sendButton.setEnabled(false);
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42
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+
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43
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adapter.setEventListener(a -> {
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44
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sendButton.setEnabled(a.getErrorCount() == 0);
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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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+
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48
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private static class Item {
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49
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final long id;
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50
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final String text;
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51
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Item(long id, String text) {
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52
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this.id = id;
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53
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this.text = text;
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54
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+
}
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55
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@Override
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56
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public String toString() {
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57
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return super.toString() + "[id=" + id + ", text='" + text + "']";
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58
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}
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59
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}
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60
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+
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61
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private static class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
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62
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interface AdapterListener extends EventListener {
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63
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void changeState(Adapter adapter);
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64
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}
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65
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+
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66
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private static class ViewHolder extends RecyclerView.ViewHolder {
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67
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final EditText editText;
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68
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String text;
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69
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public ViewHolder(@NonNull View itemView) {
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70
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super(itemView);
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71
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editText = itemView.findViewById(R.id.editText);
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72
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text = editText.getText().toString();
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73
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}
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74
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+
}
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75
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+
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76
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private List<Item> itemList = new ArrayList<>();
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77
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private Set<Long> errorSet = new HashSet<>();
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78
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private AdapterListener listener;
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79
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+
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80
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Adapter() {
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81
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//テストデータ
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82
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itemList.add(new Item(1, "ABC"));
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83
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itemList.add(new Item(2, "DEF"));
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84
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+
itemList.add(new Item(3, "GHI"));
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85
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+
itemList.add(new Item(4, "JKL"));
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86
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}
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87
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+
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88
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void setEventListener(AdapterListener listener) {
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89
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this.listener = listener;
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90
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+
if(listener != null) listener.changeState(this); //初期表示用
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91
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+
}
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92
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+
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93
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int getErrorCount() {
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94
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+
return errorSet.size();
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95
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+
}
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96
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+
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97
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+
@NonNull
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|
98
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+
@Override
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|
99
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+
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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100
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+
return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false));
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101
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+
}
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102
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+
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103
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private class EditValidator implements TextWatcher {
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104
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private EditText editText;
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105
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private Item item;
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106
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+
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107
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EditValidator(EditText editText, Item item) {
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108
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this.editText = editText;
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109
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+
this.item = item;
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110
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}
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111
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+
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112
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private boolean isValid(String text) {
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113
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return text.length() < 5; //テスト用でテキトウ
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114
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+
}
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115
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+
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116
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+
@Override
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|
117
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+
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
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118
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+
@Override
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|
119
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+
public void onTextChanged(CharSequence s, int start, int before, int count) {}
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120
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+
@Override
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|
121
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+
public void afterTextChanged(Editable s) {
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122
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+
boolean changeState;
|
|
123
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+
if(isValid(s.toString())) {
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124
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+
editText.setError(null);
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125
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+
changeState = errorSet.remove(item.id);
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126
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+
} else {
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127
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+
editText.setError("length Error");
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128
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+
changeState = errorSet.add(item.id);
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129
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+
}
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130
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+
if(changeState && listener != null) listener.changeState(Adapter.this);
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131
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+
}
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132
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+
}
|
|
133
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+
|
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134
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+
@Override
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135
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+
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
|
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136
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+
Item item = itemList.get(position);
|
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137
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+
holder.editText.setTag(item);
|
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138
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+
holder.editText.setText(item.text);
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139
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+
holder.editText.addTextChangedListener(new EditValidator(holder.editText, item));
|
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140
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+
}
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141
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+
|
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142
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+
@Override
|
|
143
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+
public int getItemCount() {
|
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144
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+
return itemList.size();
|
|
145
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+
}
|
|
146
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+
}
|
|
147
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+
}
|
|
148
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+
```
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|
149
|
+
res/layout/activity_main.xml
|
|
150
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+
```xml
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|
151
|
+
<?xml version="1.0" encoding="utf-8"?>
|
|
152
|
+
<androidx.constraintlayout.widget.ConstraintLayout
|
|
153
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+
xmlns:android="http://schemas.android.com/apk/res/android"
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|
154
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+
xmlns:tools="http://schemas.android.com/tools"
|
|
155
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+
xmlns:app="http://schemas.android.com/apk/res-auto"
|
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156
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+
android:layout_width="match_parent"
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157
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+
android:layout_height="match_parent"
|
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158
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+
tools:context=".MainActivity">
|
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159
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+
|
|
160
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+
<androidx.recyclerview.widget.RecyclerView
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|
161
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+
android:id="@+id/recyclerView"
|
|
162
|
+
android:layout_width="0dp"
|
|
163
|
+
android:layout_height="0dp"
|
|
164
|
+
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
|
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165
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+
app:layout_constraintBottom_toTopOf="@id/topOfButtons"
|
|
166
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
167
|
+
app:layout_constraintStart_toStartOf="parent"
|
|
168
|
+
app:layout_constraintTop_toTopOf="parent" />
|
|
169
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+
<androidx.constraintlayout.widget.Barrier
|
|
170
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+
android:id="@+id/topOfButtons"
|
|
171
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+
android:layout_width="0dp"
|
|
172
|
+
android:layout_height="0dp"
|
|
173
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+
app:barrierDirection="top"
|
|
174
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+
app:constraint_referenced_ids="cancelButton,sendButton" />
|
|
175
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+
<Button
|
|
176
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+
android:id="@+id/cancelButton"
|
|
177
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+
android:layout_width="wrap_content"
|
|
178
|
+
android:layout_height="wrap_content"
|
|
179
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+
android:text="CANCEL"
|
|
180
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+
app:layout_constraintBottom_toBottomOf="parent"
|
|
181
|
+
app:layout_constraintEnd_toStartOf="@id/sendButton"
|
|
182
|
+
app:layout_constraintStart_toStartOf="parent" />
|
|
183
|
+
<Button
|
|
184
|
+
android:id="@+id/sendButton"
|
|
185
|
+
android:layout_width="wrap_content"
|
|
186
|
+
android:layout_height="wrap_content"
|
|
187
|
+
android:text="SEND"
|
|
188
|
+
app:layout_constraintBottom_toBottomOf="parent"
|
|
189
|
+
app:layout_constraintEnd_toEndOf="parent"
|
|
190
|
+
app:layout_constraintStart_toEndOf="@id/cancelButton" />
|
|
191
|
+
</androidx.constraintlayout.widget.ConstraintLayout>
|
|
192
|
+
```
|
|
193
|
+
res/layout/item.xml
|
|
194
|
+
```xml
|
|
195
|
+
<?xml version="1.0" encoding="utf-8"?>
|
|
196
|
+
<EditText
|
|
197
|
+
xmlns:android="http://schemas.android.com/apk/res/android"
|
|
198
|
+
android:id="@+id/editText"
|
|
199
|
+
android:layout_width="match_parent"
|
|
200
|
+
android:layout_height="wrap_content" />
|
|
201
|
+
```
|
|
202
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+
|
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203
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+
|
|
204
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+
|