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嗨，我是Android的初學者。我正在實施一個項目，其中包括問題及其答案選項，其中包含單選按鈕和前後兩個按鈕。如何在Android中的上一個按鈕上設置選中的單選按鈕？
1）我有使用xml解析器
2）當我選擇的答案選項按下單選按鈕，然後單擊下一步其在同一活動中出現的下一個問題。
3）當我按下上一個按鈕時，它會轉到上一個問題，並在同一個活動上使用answers選項單選按鈕。
現在我想單選按鈕檢查在android中，而我去前一個問題上點擊我選擇的上一個按鈕。有人可以幫助我怎麼做。謝謝感謝。
這是我的代碼。
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.questions_screen);
databaseHelper = new DatabaseHelper(this);
databaseHelper.onOpen(sqdb);
mAnimation = new AlphaAnimation(1.0F, 0.0F);
mAnimation.setDuration(200L);
mAnimation.setInterpolator(new LinearInterpolator());
mAnimation.setRepeatCount(-1);
mAnimation.setRepeatMode(2);
txtViewQuestiontype = (TextView)findViewById(R.id.QuestionType_TXT);
txtViewQuestion = (TextView)findViewById(R.id.Question_TXT);
Options_RadioGroup = (RadioGroup)findViewById(R.id.RDOptions);
AnswerOptionsA_RadioButton = (RadioButton)findViewById(R.id.RBOption_A);
AnswerOptionsB_RadioButton = (RadioButton)findViewById(R.id.RBOption_B);
AnswerOptionsC_RadioButton = (RadioButton)findViewById(R.id.RBOption_C);
AnswerOptionsD_RadioButton = (RadioButton)findViewById(R.id.RBOption_D);
button_CheckAnswer = (Button)findViewById(R.id.Button_Check_Answer_BTN);
button_Previouse = (Button)findViewById(R.id.Button_Previous_BTN);
button_Next = (Button)findViewById(R.id.Button_Next_BTN);
button_QuestionLimit = (Button)findViewById(R.id.Btn_QuestionLimit);
button_Home = (Button)findViewById(R.id.btnHome);
read_Questions_XML_File();
button_Previouse.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
previousQuestionCalled(v);
}
});
button_Next.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
storingResult();
nextQuestionCalled(v);
}
});
}
public void storingResult()
{
int id = Options_RadioGroup.getCheckedRadioButtonId();
System.out.println("id = " + id);
if (id > 0)
{
AnswerOptions = (RadioButton) findViewById(Options_RadioGroup
.getCheckedRadioButtonId());
String str_AnswerOptions = AnswerOptions.getText().toString()
.trim();
System.out.println("rbVal = " + str_AnswerOptions);
if (str_AnswerOptions
.equals(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).Answer))
{
// Not StaticClass.isTest = false
if (!StaticClass.isTest)
{
String str_queNo = button_QuestionLimit.getText()
.toString().trim();
String strstrqueType = txtViewQuestiontype.getText()
.toString().trim();
String str_que = txtViewQuestion.getText().toString()
.trim();
String str_marks = "1";
databaseHelper.insertQueDetails(str_queNo, strstrqueType,
str_que, str_AnswerOptions, str_marks);
Toast.makeText(getApplicationContext()," Data Crated Right Succesfully ",Toast.LENGTH_SHORT).show();
}
if (StaticClass.isTest)
{
StaticClass.resultOfTest = 1 + StaticClass.resultOfTest;
((Datastructure) Vectore_mquestionDatabaseStructure
.elementAt(StaticClass.QuestionNumber))
.setResult_Of_Test(true);
return;
}
}
}
else if (id == -1)
{
Toast.makeText(this, "Please Select Any Option", Toast.LENGTH_LONG)
.show();
try
{
if (StaticClass.isTest)
{
((Datastructure) Vectore_mquestionDatabaseStructure
.elementAt(StaticClass.QuestionNumber))
.setResult_Of_Test(false);
}
if (!StaticClass.isTest)
{
Toast.makeText(getApplicationContext(), "Wrong",
Toast.LENGTH_SHORT).show();
}
((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber))
.setResult_Of_Test(false);
return;
}
catch (Exception exception)
{
exception.printStackTrace();
}
}
}
public void nextQuestionCalled(View view)
{
//if animationForward == false
if (animationForward)
{
//flag = false
boolean flag;
if (animationForward)
{ flag = false; }
else { flag = true;}
animationForward = flag;
}
//Return The Number Of Element in this Vector > 0
//-1 + 1
if (-1 + Vectore_mquestionDatabaseStructure.size() > StaticClass.QuestionNumber)
{
//If StaticClass.isTest == false
if (StaticClass.isTest)
{
StaticClass.resultOfTest_Out_OF = 1 + StaticClass.resultOfTest_Out_OF;
storingResult();
}
StaticClass.QuestionNumber = 1 + StaticClass.QuestionNumber;
reHitting();
view.clearAnimation();
if (!StaticClass.isTest) {
button_QuestionLimit.clearAnimation();
}
if (StaticClass.isTest) {
button_QuestionLimit.clearAnimation();
}
return;
}
else
{
button_QuestionLimit.startAnimation(mAnimation);
return;
}
}
public void syoutF()
{
addVallues();
}
public void previousQuestionCalled(View view)
{
if (!animationForward)
{
boolean flag;
if (animationForward)
{
flag = false;
}
else
{
flag = true;
}
animationForward = flag;
}
if (StaticClass.QuestionNumber > 0)
{
if (!StaticClass.isTest)
{
StaticClass.QuestionNumber = -1 + StaticClass.QuestionNumber;
reHitting();
button_QuestionLimit.clearAnimation();
}
view.clearAnimation();
}
else
{
button_QuestionLimit.startAnimation(mAnimation);
}
}
@SuppressLint("NewApi")
public void reHitting() {
addVallues();
if (!animationForward)
{
overridePendingTransition(R.anim.anim_in,R.anim.anim_out);
return;
}
else
{
overridePendingTransition(R.anim.anim_in,R.anim.anim_out);
return;
}
}
public void addVallues() {
try {
txtViewQuestiontype.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).Question_Type);
txtViewQuestion.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).Question);
AnswerOptionsA_RadioButton.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).OptionA);
AnswerOptionsB_RadioButton.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).OptionB);
AnswerOptionsC_RadioButton.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).OptionC);
AnswerOptionsD_RadioButton.setText(((Datastructure) Vectore_mquestionDatabaseStructure
.get(StaticClass.QuestionNumber)).OptionD);
QuestionLimitFetcher();
Options_RadioGroup.clearCheck();
return;
} catch (ArrayIndexOutOfBoundsException arrayindexoutofboundsexception) {
arrayindexoutofboundsexception.printStackTrace();
}
}
public void QuestionLimitFetcher() {
int i = Vectore_mquestionDatabaseStructure.size();
button_QuestionLimit.setText((new StringBuilder(String.valueOf(1 + StaticClass.QuestionNumber)))
.append("/").append(i).toString());
String strLimit = button_QuestionLimit.getText().toString().trim();
System.out.println("strLimit = " + strLimit);
}
public void read_Questions_XML_File()
{
Bundle extras = getIntent().getExtras();
String string_Chapter_Title = extras.getString("TOPIC_TITLE");
System.out.println("value1 = " + string_Chapter_Title);
try
{
if (string_Chapter_Title.equals("OOPs concepts"))
{
String encodedXML = URLEncoder.encode("collections.xml");
db = SAXXMLParser.parse(getAssets().open(encodedXML));
i = Vectore_mquestionDatabaseStructure.size();
System.out.println("Vector Size i" + i);
int lastIndex = Vectore_mquestionDatabaseStructure.lastIndexOf(db.lastElement());
System.out.println("lastIndex = " + lastIndex);
}
else if (string_Chapter_Title.equals("Java virtual machine"))
{
String encodedXML = URLEncoder.encode("java_keyword.xml");
db = SAXXMLParser.parse(getAssets().open(encodedXML));
i = Vectore_mquestionDatabaseStructure.size();
System.out.println("Vector Size i" + i);
System.out.println("Last element: " + (Integer)Vectore_mquestionDatabaseStructure.lastElement());
}
}
catch (IOException ioexception)
{
ioexception.printStackTrace();
}
catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
syoutF();
}
}
radioButton.setChecked（true）; – 2014-10-08 05:32:22
當您轉到上一個問題時，單選按鈕處於未選中狀態？ – Shadow 2014-10-08 05:42:37
@bean_droid： - 是的，我想顯示前一個按鈕上的前一個單選按鈕被選中。 – 2014-10-08 05:44:57