java - Viewpager setCurrentItem() doesn't update onPageSelected()

Question

When I swipe between questions, it loads current page number correctly

BUT when I use next button, first click doesnt loads pagenumber ( I mean onPageSelected() doesnt work.) second and other clicks loads content but it loads 1 page previous.

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

    this.setContentView(R.layout.activity_main);

    mPager = (ViewPager)findViewById(R.id.pager);
    QuestionPagerAdapter mAdapter = new QuestionPagerAdapter();

    mPager.setAdapter(mAdapter);

    OnPageChangeListener pageChangeListener = new OnPageChangeListener() {

        @Override
        public void onPageScrollStateChanged(int arg0) { }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) { }

        @Override
        public void onPageSelected(int position) {
            tv.setText( mPager.getCurrentItem()+"");
        }

    };

    mPager.setOnPageChangeListener(pageChangeListener);

    Question.next.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {

        mPager.setCurrentItem(getItem(+1));
        }
    }

    private int getItem(int i) {
        int a = mPager.getCurrentItem();
        i += a;
        return i;
    }
});

Answer 1

为什么不在你的听众中这样做：

mPager.setCurrentItem(mPager.getCurrentItem() + 1);