how to get access of my button in one of my viewpager pages?

I'm new to this android and java.

My viewpager now can slide all my xml layout, but i don't know how to access item in them.

I tried using Button mybutton = (Button) findViewById (R.layout.result), then set the onClickListener in mybutton, but then it was forced to close every time I run it.

Here is my code:

public class main extends Activity {

    private ViewPager myviewpager;
    private ViewPagerAdapter myviewpageradapter;
    private static int NUM_AWESOME_VIEWS = 12;
    Button button_1;



    @Override
    public void onCreate(Bundle 开发者_JAVA技巧savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        myviewpageradapter = new ViewPagerAdapter();
        myviewpager = (ViewPager) findViewById(R.id.myviewpager);
        myviewpager.setAdapter(myviewpageradapter);

            button_1 = (Button) myviewpager.findViewById(R.id.first_button);
            button_1.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    finish();
                }
            });
    }

    private class ViewPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
                return NUM_AWESOME_VIEWS;
        }

        @Override
        public Object instantiateItem(View collection, int position) {
                LayoutInflater layoutinflater = getLayoutInflater();

                View view;
                view = layoutinflater.inflate(R.layout.page1, null);

                switch (position)
                {
                    case 0 : view = layoutinflater.inflate(R.layout.page1, null); break;
                    case 1 : view = layoutinflater.inflate(R.layout.page2, null); break;
                    case 2 : view = layoutinflater.inflate(R.layout.page3, null); break;
                    case 3 : view = layoutinflater.inflate(R.layout.page4, null); break;
                    case 4 : view = layoutinflater.inflate(R.layout.page5, null); break;
                    case 5 : view = layoutinflater.inflate(R.layout.page6, null); break;
                    case 6 : view = layoutinflater.inflate(R.layout.page7, null); break;
                    case 7 : view = layoutinflater.inflate(R.layout.page8, null); break;
                    case 8 : view = layoutinflater.inflate(R.layout.page9, null); break;
                    case 9 : view = layoutinflater.inflate(R.layout.page10, null); break;
                    case 10 : view = layoutinflater.inflate(R.layout.page11, null); break;
                    case 11 : view = layoutinflater.inflate(R.layout.result, null);break;
                }
                ((ViewPager) collection).addView(view,0);
                return view;
        }

        @Override
        public void destroyItem(View collection, int position, Object view) {
                ((ViewPager) collection).removeView((View) view);
        }



        @Override
        public boolean isViewFromObject(View view, Object object) {
                return view==((View)object);
        }

        @Override
        public void finishUpdate(View arg0) {}


        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {}

        @Override
        public Parcelable saveState() {
                return null;
        }

        @Override
        public void startUpdate(View arg0) {}

    }

It may just be the Problem, that your items are not found probably so try this(If your view is no LinearLayout change it)

LayoutInflater getView = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

LinearLayout view1 =(LineaLayout)getView.inflate(R.layout.your_view,null);

But Your Button may throw Exception furthermore there is an onClickListener set to it. If it's just the Button define it in XML:

android:onClick"buttonClick"

then in Code

public void buttonClick(View v){

// do something

}

If this is not possible because you need to reference the Button later, I stuck with the same Problem and would like to know how it works.

I think the problem here is that you are trying to find a view (findViewById) that wasn't instatiated (inflated) yet. Try to set the button listener inside the instatiateItem method of ViewPagerAdapter type.

Example:

    switch(position){
    case 0 : 
    view = layoutinflater.inflate(R.layout.page1, null); 
    button_1 = (Button) view.findViewById(R.id.first_button);
    button_1.setOnClickListener(new OnClickListener() {
         public void onClick(View v) {
               finish();
               }
         });
    break;
    (...)    
    }