如何使用setOnClickListener向viewpager添加按钮

Question

我有一个带按钮的布局。我使用FragmentActivity：

public class slidepage extends FragmentActivity {

private static final int NUM_PAGES = 5;

private ViewPager mPager;

private PagerAdapter mPagerAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_screen_slide);


    mPager = (ViewPager) findViewById(R.id.pager);
    mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
    mPager.setAdapter(mPagerAdapter);

    Button Back = (Button) findViewById(R.id.back);

    Back.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            onBackPressed();

        }
    });

}

}

幻灯片课程：

public class slider extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    ViewGroup view;

    if(GlobalConfig.tryb) {
        view = (ViewGroup) inflater.inflate(R.layout.n_podglad, container, false);
    } else {
        view = (ViewGroup) inflater.inflate(R.layout.d_podglad, container, false);
    }

    /* Powrót */

    Button Back = (Button) view.findViewById(R.id.back);

    Back.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            //onBackPressed();

        }
    });

    return view;
}
}

不幸的是我的按钮不起作用。我在日志中收到空引用。怎么了？如何在viewpager中的按钮上设置OnClickListener？

Answer 1

在ScreenSlidePagerAdapter方法中的instantiateItem内，请点击不在slidepage

中的按钮

@Override
public Object instantiateItem(View container, int position) {
    // TODO Auto-generated method stub
    LayoutInflater inflater = (LayoutInflater) act
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View layout= inflater.inflate(R.layout.pager_layout, null);
    Button Back= (Button) layout.findViewById(R.id.back);
    Back.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        onBackPressed();

    }
  });
    return layout;
}