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我試圖在3個單選按鈕中的一個被選中時立即更新頁面的視圖，以便當我再次訪問該視圖時，我已經查看了該答案。 我正在以滑動視圖正確地獲取所有數據，但是當我再次滑回相同問題時，我的所選答案未顯示。如何更新PagerAdapter中的選定答案單選按鈕？
MyActivity.java
MyQuizPagerAdapter adapter = new MyQuizPagerAdapter(questions,num_rows,quiz_subject,actionBar);
ViewPager myPager = (ViewPager) findViewById(R.id.home_pannels_pager_quiz);
myPager.setAdapter(adapter);
MyQuizAdapter.java
public class MyQuizPagerAdapter extends PagerAdapter {
String[][] questions;
int num_rows;
String quiz_subject;
ActionBar actionBar;
int position1;
public MyQuizPagerAdapter(String[][] questions, int num_rows, String quiz_subject, ActionBar actionBar)
{
this.questions=questions;
this.num_rows=num_rows;
this.quiz_subject=quiz_subject;
this.actionBar=actionBar;
}
// State number of pages
@Override
public int getCount() {
return num_rows;
}
// Set each screen's content
@Override
public Object instantiateItem(View container, int position) {
Context context = container.getContext();
LinearLayout layout = new LinearLayout(context);
actionBar.setSubtitle(questions[position][5]);
position1=position;
TextView textItem2 = new TextView(context);
textItem2.setTextSize(20);
textItem2.setTypeface(null, Typeface.BOLD);
textItem2.setText("Question: "+(position+1));
textItem2.setPadding(20, 0, 0, 0);
TextView textItem = new TextView(context);
//textItem.setGravity(Gravity.CENTER);
textItem.setTextSize(13);
textItem.setTypeface(null, Typeface.BOLD);
textItem.setPadding(20, 20, 20, 40);
textItem1.setTextSize(15);
textItem1.setPadding(20, 50, 20, 20);*/
RadioButton button1 = new RadioButton(context);
RadioButton button2 = new RadioButton(context);
RadioButton button3 = new RadioButton(context);
button1.setTextSize(12);
button2.setTextSize(12);
button3.setTextSize(12);
button1.setPadding(45, 5, 5, 7);
button2.setPadding(45, 5, 5, 7);
button3.setPadding(45, 5, 5, 7);
button1.setId(R.id.Option1);
button2.setId(R.id.Option2);
button3.setId(R.id.Option3);
RadioGroup rg = new RadioGroup(context);
switch(Integer.parseInt(questions[position][7]))
{
case 0:
break;
case 1:
rg.check(R.id.Option1);
break;
case 2:
rg.check(R.id.Option2);
break;
case 3:
rg.check(R.id.Option3);
break;
default:
break;
}
layout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
layout.setOrientation(LinearLayout.VERTICAL);
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group,
int checkedId) {
switch (checkedId) { //set the Model to hold the answer the user picked
case R.id.Option1:
questions[position1][7]="1";
actionBar.setSubtitle("option1");
break;
case R.id.Option2:
questions[position1][7]="2";
actionBar.setSubtitle("option2");
break;
case R.id.Option3:
questions[position1][7]="3";
actionBar.setSubtitle("option3");
break;
default:
questions[position1][7]="0"; // Something was wrong set to the default
actionBar.setSubtitle("error");
break;
}
}
});
textItem.setText(questions[position][1]);
button1.setText("A: "+questions[position][2]);
button2.setText("B: "+questions[position][3]);
button3.setText("C: "+questions[position][4]);
//textItem1.setText(content);
rg.addView(button1);
rg.addView(button2);
rg.addView(button3);
layout.addView(textItem2);
layout.addView(textItem);
//layout.addView(textItem1);
layout.addView(rg);
((ViewPager) container).addView(layout, 0); // This is the line I added
return layout;
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
@Override
public Parcelable saveState() {
return null;
}
}