我有一个列表视图，其中包含4个列表项，每个列表项包含2个文本视图和1个edittext视图。我在自定义适配器中定义了一个addTextChangedListener，以查找edittext中的更改，然后保存文本。
当列表项2,3和4中的edittext视图中的文本被更改时，addTextChangedListener将触发一次，但是当单击列表项1中的编辑文本时，它会多次触发。此外，当我打印从基本适配器单击的列表项的位置时，它显示所有4个列表项都已循环。
有人可以解释为什么会这样，请提出解决方案。
下面是代码和logcat输出。
列表视图XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.dumbrella.uidesign.ListView">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:descendantFocusability="beforeDescendants" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/btnSubmit"
android:layout_below="@+id/listView"
android:layout_centerHorizontal="true" />
</RelativeLayout>
列出项目XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="32dp"
android:text="IC"
android:gravity="center"
android:id="@+id/questionIcon"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Small Text"
android:id="@+id/questionText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_toRightOf="@+id/questionIcon"
android:layout_toEndOf="@+id/questionIcon"
android:layout_alignParentTop="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/userAnswer"
android:layout_alignParentBottom="true"
android:layout_toRightOf="@+id/questionIcon"
android:layout_alignRight="@+id/questionText"
android:layout_alignEnd="@+id/questionText"
android:inputType="text"
android:textSize="12dp"/>
</RelativeLayout>
列表视图活动：
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class QuestionsListView extends AppCompatActivity {
String TAG = "Question List View Activity";
ArrayList<ListData> adapterList = new ArrayList<ListData>();
ListView listViewDetail;
QuestionsAdapter mQuestionAdapter;
SharedPreferences userAnswersSharedPreferences;
SharedPreferences.Editor userAnswersSharedPreferencesEditor;
private String[] questionIcon = new String[]{
"T", "W", "M", "C"
};
private String[] questionDescription = new String[]{
"Question1?", "Question2?", "Question3?", "Question4?"
};
private String[] userAnswerHint = new String[]{
"Answer1", "Answer2", "Answer3", "Answer4"
};
private String[] userAnswers = new String[] {
"Null", "Null", "Null", "Null"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
listViewDetail = (ListView) findViewById(R.id.listView);
getDataInList();
mQuestionAdapter = new QuestionsAdapter();
listViewDetail.setAdapter(mQuestionAdapter);
userAnswersSharedPreferences = getSharedPreferences("UserAnswersPreferences", Context.MODE_PRIVATE);
userAnswersSharedPreferencesEditor = userAnswersSharedPreferences.edit();
Button btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for (int i=0; i<questionIcon.length; i++) {
ListData currentListData1 = mQuestionAdapter.getItem(i);
Log.v("TAG" , currentListData1.getQuestionIcon());
Log.v("TAG" , currentListData1.getQuestionDescription());
Log.v("TAG" , currentListData1.getUserAnswerHint());
Log.v("TAG" , currentListData1.getUserAnswer());
}
}
});
}
private void getDataInList() {
for (int i = 0; i < questionIcon.length; i++) {
// Create a new object for each list item
ListData listData = new ListData();
listData.setQuestionIcon(questionIcon[i]);
listData.setQuestionDescription(questionDescription[i]);
listData.setUserAnswerHint(userAnswerHint[i]);
listData.setUserAnswer("Null");
// Add this object into the ArrayList myList
adapterList.add(listData);
}
}
public class QuestionsAdapter extends BaseAdapter {
@Override
public int getCount() {
return adapterList.size();
}
@Override
public ListData getItem(int position) {
return adapterList.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item, parent, false);
}
final TextView questionText = (TextView) convertView.findViewById(R.id.questionText);
final TextView questionIcon = (TextView) convertView.findViewById(R.id.questionIcon);
final EditText userAnswer = (EditText) convertView.findViewById(R.id.userAnswer);
final ListData currentListData = getItem(position);
questionIcon.setText(currentListData.getQuestionIcon());
questionText.setText(currentListData.getQuestionDescription());
//userAnswer.setHint(currentListData.getUserAnswerHint());
questionIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("TAG", "In Listener");
questionIcon.setText("Z");
}
});
userAnswer.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
Log.v("ListView Adapter After", "Text Changed to :" + s.toString());
Log.v("ListView Adapter After", "List Item Clicked :" + String.valueOf(position));
currentListData.setUserAnswer(userAnswer.getText().toString());
switch (position) {
case 0:
userAnswersSharedPreferencesEditor.putString("T",s.toString());
break;
case 1:
userAnswersSharedPreferencesEditor.putString("W",s.toString());
break;
case 2:
userAnswersSharedPreferencesEditor.putString("M",s.toString());
break;
case 3:
userAnswersSharedPreferencesEditor.putString("C",s.toString());
break;
}
userAnswersSharedPreferencesEditor.commit();
userAnswers[position] = currentListData.getUserAnswer();
}
});
return convertView;
}
}
private class ListData {
private String questionIcon;
private String questionDescription;
private String userAnswerHint;
private String userAnswer;
public String getQuestionIcon() {
return questionIcon;
}
public void setQuestionIcon(String questionIcon) {
this.questionIcon = questionIcon;
}
public String getQuestionDescription() {
return questionDescription;
}
public void setQuestionDescription(String questionDescription) {
this.questionDescription = questionDescription;
}
public String getUserAnswerHint() {
return userAnswerHint;
}
public void setUserAnswerHint(String userAnswerHint) {
this.userAnswerHint = userAnswerHint;
}
public String getUserAnswer() {
return userAnswer;
}
public void setUserAnswer(String userAnswer) {
this.userAnswer = userAnswer;
}
}
}
Logcat输出:(当列表项2,3和4中的文本被更改时）
05-11 20:58:03.453 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:58:03.453 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :2
05-11 20:58:03.453 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:58:03.453 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :3
05-11 20：58：03.453 3914-3914 / com.dumbrella.uidesign V / ListView Adapter After：Text Changed to：f 05-11 20：58：03.453 3914-3914 / com.dumbrella.uidesign V / ListView Adapter After：List Item Clicked：4
Logcat输出:(当列表项1中的文本被更改时）
05-11 20:59:22.928 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.928 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :0
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :1
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :2
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :3
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :0
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :1
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :2
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :3
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :0
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :1
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.929 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :2
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :3
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign
V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :0
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :1
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :2
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :3
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: Text Changed to :f
05-11 20:59:22.930 3914-3914/com.dumbrella.uidesign V/ListView Adapter After: List Item Clicked :0
答案 0 :(得分：1)
zgc7009是正确的，因为您没有正确接近getView方法。虽然你对如何膨胀视图没有错。我怀疑的问题是，无法保证调用getView多少次TextWatcher将EditText个侦听器添加到TextWatcher。起初我以为你只能向EditText添加一个addTextChangedListener监听器，但事实证明你可以添加很多。这是public void addTextChangedListener(TextWatcher watcher) {
if (mListeners == null) {
mListeners = new ArrayList<TextWatcher>();
}
mListeners.add(watcher);
}
方法的来源：
getView反正。 if(currentListData.hasListener) { // Just an example. You define the logic or how you want to store the TextWatcher listener
userAnswer.addTextChangedListener(new TextWatcher() {
//le code
}
}
被称为多个时间并添加越来越多的侦听器。但是你无法知道这将会是多少次。您需要将侦听器与数据或其他方式相关联。这样您就可以检查是否应该添加侦听器。如下所示：
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item, parent, false);
EditText userAnswer = (EditText) convertView.findViewById(R.id.userAnswer);
userAnswer.addTextChangedListener(new TextWatcher() {
//le code
@Override
public void afterTextChanged(Editable s) {
//Figure out the best way to get the current position.
}
}
}
我当然不会为你编写代码。但那就是如何解决它。
修改
实际上，在考虑更多之后，你甚至不应该创造比必要更多的听众。在给视图充气时添加监听器。
{{1}}
答案 1 :(得分：0)
答案 2 :(得分：0)
最好动态添加布局而不是ListView项。处理EditText中的ListView非常重要。
这是我的建议。
第1步：添加LinearLayout而不是ListView。它的方向必须垂直
第2步：在此LinearLayout上动态添加列表项布局，初始化其组件并将Value设置为该组件。
以下示例可以动态地将布局添加到LinearLayout中：
List<EditText> lists=new ArrayList<EditText>();
LinearLayout options_layout = (LinearLayout) findViewById(R.id.root_layout);
for (int i = 0; i < 4; i++) {
View to_add = inflater.inflate(R.layout.list_element,
options_layout,false);
EditText text = (EditText) to_add.findViewById(R.id.your_edit_text);
text.setText("YOUR VALUE");
lists.add(text);
options_layout.addView(to_add);
}
第3步：将所有EditText添加到每个List<EditText>的{{1}}和addTextChangedListener。
在EditText来电回复后，您可以通过afterTextChanged上的简单循环从EditText获取所有List<EditText>值。
希望这会对你有所帮助:)。