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POHow to update the viewpager adapter from main view button onclick method?
 

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  1. POHow to update the viewpager adapter from main view button onclick method?
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    <pre><code> ArrayList &lt;HashMap&lt;String,String&gt;&gt; quesion_list,answerkey; viewPager = (ViewPager) findViewById(R.id.pager); adapter = new ViewPagerAdapter(PracticeModeActivity.this,quesion_list,A1,A2,A3,A4,A5); // Binds the Adapter to the ViewPager viewPager.setAdapter(adapter); viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int i, float v, int i2) { } @Override public void onPageSelected(int i) { // Log.i("page",String.valueOf(i)); viewPager.getAdapter().getCount(); int current = viewPager.getCurrentItem(); int current_count=current+1; // Log.i("count",String.valueOf(viewPager.getAdapter().getCount())); noquestions.setText(String.valueOf(current_count)+" of "+length); // Log.i("options",options.toString()); // if(i!=0) // { // answerA1.setChecked(false); // answerA2.setChecked(false); // answerA3.setChecked(false); // answerA4.setChecked(false); // // } } @Override public void onPageScrollStateChanged(int i) { // viewPager.getParent().requestDisallowInterceptTouchEvent(true); } }); public class ViewPagerAdapter extends PagerAdapter { // Declare Variables Context context; String[] rank; String[] country; String[] population; int[] flag; LayoutInflater inflater; private ArrayList&lt;HashMap&lt;String, String&gt;&gt; hashmap; public ViewPagerAdapter(Context context,ArrayList&lt;HashMap&lt;String, String&gt;&gt; hashMaps) { this.context = context; this.hashmap = hashMaps; } @Override public int getCount() { return hashmap.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view == ((RelativeLayout) object); } @Override public void finishUpdate(View container) { } @Override public void restoreState(Parcelable state, ClassLoader loader) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View container) { } @Override public Object instantiateItem(final ViewGroup container, final int position) { // Declare Variables TextView txtrank; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); itemView = inflater.inflate(R.layout.question_item, container,false); TextView correctanswer=(TextView)itemView.findViewById(R.id.correctanswer); ((ViewPager) container).addView(itemView); r1=(RadioButton)itemView.findViewById(R.id.answerA1); return itemView; } } /* button onclick method */ public void Clear(View v) { viewPager.findViewWithTag(viewPager.getCurrentItem()); int current = viewPager.getCurrentItem(); Log.i("click",String.valueOf(current)); // View view=viewPager.getChildAt(current); // ((ViewGroup))mViewPager.getChildAt(MyActivity.mViewPager.getCurrentItem())); View view = viewPager.getChildAt(viewPager.getCurrentItem()); options.set(current, "0"); // adapter = new ViewPagerAdapter(PracticeModeActivity.this,quesion_list); // Binds the Adapter to the ViewPager // viewPager.setAdapter(adapter); viewPager.getAdapter().notifyDataSetChanged(); RadioButton rl11=(RadioButton)v.findViewById(R.id.answerA1); // rl11.setChecked(false); // } </code></pre> <p>Here i am using viewpager adaper for listview.Clear is a onclick method for outside of the adapter.if i click the button,the radio button is disable for the first to positions.after that i got null pointer exception.is there any idea to rectify this problem?i need to work on this.anybody help me?</p>
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