如何在自定义 ListView 适配器中处理 RadioGroup 的 onCheckedChangeListener [英] How to handle onCheckedChangeListener for a RadioGroup in a custom ListView adapter
问题描述
我正在开发一个具有自定义布局的列表视图的应用程序，如下所示:
它在 RadioGroup 中有 4 个 RadioButtons 和一个 TextView.实际上，它会显示为question(TextView) 和answers(RadioButtons) 列表.上面的视图在我的自定义适配器中膨胀了，它扩展了 ArrayAdapter.
I am developing an app which has a list view with custom layout as follows :
It has 4 RadioButtons in RadioGroup and a TextView. Actually, it ll be shown as question(TextView) and answers(RadioButtons) list. Above view is inflated in my custom adapter which extends ArrayAdapter<Question>.
问题是，我应该如何在我的自定义Adapter 中维护RadioButtons 的状态?当RadioButton被pressed/checked并且列表向下滚动时，adapter自动回收视图并且RadioButton状态丢失.
The problem is that, how should I maintain the state of RadioButtons in my custom Adapter? When RadioButton is pressed/checked and list is scrolled down, adapter automatically recycles view and the RadioButton state is lost.
- 那么，任何人都可以提供与此相关的任何链接/信息的指南吗?
- 或者我应该如何实现问答列表?
我关注的文章:http://www.vogella.de/articles/AndroidListView/article.html.
上面的链接使用了 CheckBox，以类似的方式我想使用 RadioGroup(RadioButtons) 而不是 CheckBoxes.
The above link is using a CheckBox, in similar manner I want to use the RadioGroup(RadioButtons) instead of CheckBoxes.
推荐答案
改编该教程很容易，因此您可以使用 RadioGroup 而不是 CheckBox.Bellow 是一个例子(我使用了一个 RadioGroup 和 4 个 RadioButton).首先，您必须修改 Model 类，以便它可以保存新数据:
It's easy to adapt that tutorial so you can use a RadioGroup instead of a CheckBox. Bellow is an example(I used a RadioGroup with 4 RadioButton). First of all you'll have to modify the Model class so it can hold the new data:
public class Model {
String question; // hold the question
int current = NONE; // hold the answer picked by the user, initial is NONE(see below)
public static final int NONE = 1000; // No answer selected
public static final int ANSWER_ONE_SELECTED = 0; // first answer selected
public static final int ANSWER_TWO_SELECTED = 1; // second answer selected
public static final int ANSWER_THREE_SELECTED = 2; // third answer selected
public static final int ANSWER_FOUR_SELECTED = 3; // forth answer selected
public Model(String question) {
this.question = question;
}
}
然后修改getView()方法，根据模型设置视图:
Then modify the getView() method to set the views according to the model:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder = null;
if (v == null) {
v = inflater.inflate(R.layout.the_row, parent, false);
holder = new ViewHolder(v);
v.setTag(holder);
holder.group
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group,
int checkedId) {
Integer pos = (Integer) group.getTag(); // To identify the Model object i get from the RadioGroup with getTag()
// an integer representing the actual position
Model element = list.get(pos);
switch (checkedId) { //set the Model to hold the answer the user picked
case R.id.answer0:
element.current = Model.ANSWER_ONE_SELECTED;
break;
case R.id.answer1:
element.current = Model.ANSWER_TWO_SELECTED;
break;
case R.id.answer2:
element.current = Model.ANSWER_THREE_SELECTED;
break;
case R.id.answer3:
element.current = Model.ANSWER_FOUR_SELECTED;
break;
default:
element.current = Model.NONE; // Something was wrong set to the default
}
}
});
} else {
holder = (ViewHolder) v.getTag();
}
holder.group.setTag(new Integer(position)); // I passed the current position as a tag
holder.t.setText(list.get(position).question); // Set the question body
if (list.get(position).current != Model.NONE) {
RadioButton r = (RadioButton) holder.group.getChildAt(list
.get(position).current);
r.setChecked(true);
} else {
holder.group.clearCheck(); // This is required because although the Model could have the current
// position to NONE you could be dealing with a previous row where
// the user already picked an answer.
}
return v;
}
然后是 ViewHolder 类:
class ViewHolder {
TextView t = null;
RadioGroup group;
ViewHolder(View v) {
t = (TextView) v.findViewById(R.id.textView1);
group = (RadioGroup) v.findViewById(R.id.group_me);
}
}
带有 RadioGroup 的 xml 布局:
The xml layout with a RadioGroup:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RadioGroup
android:id="@+id/group_me"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/answer0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans0" />
<RadioButton
android:id="@+id/answer1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans1" />
<RadioButton
android:id="@+id/answer2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans2" />
<RadioButton
android:id="@+id/answer3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="false"
android:text="Ans3" />
</RadioGroup>
</LinearLayout>
这篇关于如何在自定义 ListView 适配器中处理 RadioGroup 的 onCheckedChangeListener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
