【发布时间】：2017-01-13 07:52:51
【问题描述】：
我一直在开发一个简单的应用程序，该应用程序具有一个功能，您可以通过回答多项选择题来测试您的知识。选择答案后（通过单选按钮），如果答案正确，我想在所选答案的右侧显示一个复选标记，或者如果答案不正确，我想显示一个“X”。出于某种原因，我的代码在第一次尝试时运行良好，然后在选择其他答案时没有任何改变。
这里是代码（它是适配器的一部分 - 子视图）
/**
* Creates the View of group(parent) in the ExpandableListView
*
* @return the View of each parent in the List
*/
@Override
public View getGroupView(final int groupPosition, final boolean isExpanded, View convertView, final ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(context);
View parentView = inflater.inflate(R.layout.custom_list_parent, parent, false);
Question myQuestion = myList.get(groupPosition);
//setting the text of each parent
TextView singleTitle = (TextView) parentView.findViewById(R.id.title);
singleTitle.setText(myQuestion.getQuestion());
//handling the indicator
ImageView indicator = (ImageView) parentView.findViewById(R.id.indicator);
//if the list is expanded use arrow up, if not then use arrow down
int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float : android.R.drawable.arrow_down_float;
//initial arrow
indicator.setImageResource(imageResourceId);
indicator.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/**
* Will expand and collapse groups depending on previous state
* @param v the View from which the ClickListener was triggered
*/
if (isExpanded) ((ExpandableListView) parent).collapseGroup(groupPosition);
else ((ExpandableListView) parent).expandGroup(groupPosition, true);
}
});
return parentView;
}
/**
* Creates the View of child in the ExpandableListView
* @return the View of each child in the List
*/
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(context);
final View childView = inflater.inflate(R.layout.custom_list_child_questions, parent, false);
handleRadioButtons(childView,groupPosition);
return childView;
}
/**
* Checks if the child can be selected/pressed as well
*
* @return whether the child is selectable or not
*/
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
public void handleRadioButtons(View childView, int groupPosition) {
final Question myQuestion = myList.get(groupPosition);
RadioGroup group = (RadioGroup) childView.findViewById(R.id.buttonGroup);
initializeButtons(childView);
setButtonText(myQuestion);
//if one of the buttons is pressed
group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
/**
* Will expand and collapse groups depending on previous state
* @param group the button group this ActionListener will operate on
* @param checkedId the ID of the individual button that was pressed
*/
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
//get the index of the correct answer
int indexAnswer = Integer.parseInt(myQuestion.getAnswer()) - 1;
for (int i = 0; i < possibleAnswers.length; i++) {
//if the button at position i was pressed
if (checkedId == possibleAnswers[i].getId()) {
//if its the correct answer
if (i == indexAnswer)
possibleAnswers[i].setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.checkmark, 0);
else
possibleAnswers[i].setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.wrong, 0);
} else {
possibleAnswers[i].setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
}
}
}
});
}
/**
* Sets the text of each radio button as a possible answer
* @param myQuestion the Question corresponding to the possible answers
*/
public void setButtonText(Question myQuestion) {
for (int i = 0; i < possibleAnswers.length; i++) {
possibleAnswers[i].setText(myQuestion.getPossibleAnswers()[i]);
}
}
/**
* Initializes the RadioButton array of possible answers
* @param childView the View in which the radio buttons are defined
*/
public void initializeButtons(View childView) {
//array of radioButtons, each button will correspond to a possible answer
possibleAnswers[0] = (RadioButton) childView.findViewById(R.id.answer1);
possibleAnswers[1] = (RadioButton) childView.findViewById(R.id.answer2);
possibleAnswers[2] = (RadioButton) childView.findViewById(R.id.answer3);
possibleAnswers[3] = (RadioButton) childView.findViewById(R.id.answer4);
}
}
和xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#6495ED"
android:layout_width="match_parent"
android:layout_height="135dp">
<RadioGroup
android:id="@+id/buttonGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice1"
android:drawablePadding="6dp"
android:textColor="#ffffff"
android:textSize="12dp"
android:id="@+id/answer1"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice 2"
android:drawablePadding="6dp"
android:textColor="#ffffff"
android:textSize="12dp"
android:id="@+id/answer2"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice 3"
android:drawablePadding="6dp"
android:textColor="#ffffff"
android:textSize="12dp"
android:id="@+id/answer3"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice 4"
android:drawablePadding="6dp"
android:textColor="#ffffff"
android:textSize="12dp"
android:id="@+id/answer4"
/>
</RadioGroup>
这就是问题在屏幕上的样子： problem
有什么想法吗？请帮忙！
编辑：
这就是我现在正在做的事情，试图玩弄可见性：
public void handleRadioButtons(final View childView, int groupPosition) {
final Question myQuestion = myList.get(groupPosition);
RadioGroup group = (RadioGroup) childView.findViewById(R.id.buttonGroup);
initializeButtons(childView, myQuestion);
setButtonText(myQuestion);
//if one of the buttons is pressed
group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
/**
* Will expand and collapse groups depending on previous state
*
* @param group the button group this ActionListener will operate on
* @param checkedId the ID of the individual button that was pressed
*/
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
//get the index of the correct answer
for (int i = 0; i < possibleAnswers.length; i++) {
//if the button at position i was pressed
if (checkedId == possibleAnswers[i].getId()) {
possibleAnswers[i].getCompoundDrawables()[2].setVisible(true,true);
}
}
}
});
}
/**
* Initializes the RadioButton array of possible answers
* @param childView the View in which the radio buttons are defined
*/
public void initializeButtons(View childView,Question myQuestion) {
//array of radioButtons, each button will correspond to a possible answer
possibleAnswers[0] = (RadioButton) childView.findViewById(R.id.answer1);
possibleAnswers[1] = (RadioButton) childView.findViewById(R.id.answer2);
possibleAnswers[2] = (RadioButton) childView.findViewById(R.id.answer3);
possibleAnswers[3] = (RadioButton) childView.findViewById(R.id.answer4);
for(int i=0;i<possibleAnswers.length;i++){
if(Integer.parseInt(myQuestion.getAnswer()) - 1 == i){
possibleAnswers[i].setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.checkmark, 0);
possibleAnswers[i].getCompoundDrawables()[2].setVisible(false,true);
}
else{
possibleAnswers[i].setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.wrong, 0);
possibleAnswers[i].getCompoundDrawables()[2].setVisible(false,true);
}
}
}
【问题讨论】：
标签： java android radio-button expandablelistview drawable