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我在每个页面上使用了使用PagerSlidingTabStrip 库和表单的 ViewPager。我尝试在SimpleOnPageChangeListener.onPageSelected方法上验证表单，如果任何字段为空，则再次返回同一页面。但是我的以下代码在页面滑动时可以正常工作，但是如果我单击选项卡，则不会返回上一页。在 Viewpager 中如何验证页面更改时的表单以及是否有任何空字段留在同一页面上？

private int mLastPage;

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

        mLastPage = 0;

        newInspectionPagerTabStrip = (PagerSlidingTabStrip) findViewById(R.id.new_inspection_pager_tab_strip);
        newInspectionPagerTabStrip.setViewPager(mViewpager);

        newInspectionPagerTabStrip.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
            @Override
            public void onPageScrollStateChanged(int state) {
                super.onPageScrollStateChanged(state);
            }

            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                super.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }

            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);

                NewInspectionPagerAdapter adapter = (NewInspectionPagerAdapter)mViewpager.getAdapter();

                // If reverse page navigation(page 1 to page 0) dont validate forms and return   
                if(mLastPage > position){
                    return;
                }

                // If move from Page-0 to Page-1
                if(mLastPage==0){
                    NewInspectionFragment1 newInspectionFragment1 = (NewInspectionFragment1) adapter.getRegisteredFragment(0);
                    View newInspectionForm1GridLayout = newInspectionFragment1.getView();

                    EditText timeInEditText = (EditText) newInspectionForm1GridLayout.findViewById(R.id.new_inspection_form1_et_value_timein);
                    String timeIn = timeInEditText.getText().toString();

                    FORM_1_TIMEIN = timeIn;

                    EditText ageEditText = (EditText) newInspectionForm1GridLayout.findViewById(R.id.new_inspection_form1_et_value_age);
                    int age = ageEditText.getText().toString();

                    FORM_1_AGE = age;

                    // If any field is empty, again return to Page-0 and set mLastPage as 0
                    if(FORM_1_TIMEIN.isEmpty() || FORM_1_AGE==0)
                    {
                        mViewpager.setCurrentItem(0);

                        if(FORM_1_AGE==0)
                        {
                            ageEditText.setError(getString(R.string.error_incorrect_age));
                            ageEditText.requestFocus();
                        }

                        if(FORM_1_TIMEIN.isEmpty())
                        {
                            timeInEditText.setError(getString(R.string.error_incorrect_timein));
                            timeInEditText.requestFocus();
                        }

                        mLastPage = 0;
                        return;
                    }
                }
                else if(mLastPage==1){
                    NewInspectionFragment2 newInspectionFragment2 = (NewInspectionFragment2) adapter.getRegisteredFragment(1);
                    View newInspectionForm2GridLayout = newInspectionFragment2.getView();

                    EditText totalEditText = (EditText) newInspectionForm2GridLayout.findViewById(R.id.new_inspection_form2_et_value_total);
                    int total=totalMortalityEditText.getText().toString();

                    FORM_2_TOTAL = total;

                    EditText percentageEditText = (EditText) newInspectionForm2GridLayout.findViewById(R.id.new_inspection_form2_et_value_percentage);
                    int percentage=percentageEditText.getText().toString();

                    FORM_2_PERCENTAGE = percentage;

                    if(FORM_2_TOTAL==0 || FORM_2_PERCENTAGE==0)
                    {
                        mViewpager.setCurrentItem(1);

                        if(FORM_2_PERCENTAGE==0)
                        {
                            percentageEditText.setError(getString(R.string.error_incorrect_percentage));
                            percentageEditText.requestFocus();
                        }

                        if(FORM_2_TOTAL_MORTALITY==0)
                        {
                            totalEditText.setError(getString(R.string.error_incorrect_total));
                            totalEditText.requestFocus();
                        }

                        mLastPage = 1;
                        return;
                    }
                }
                else if(mLastPage==2){
                   // Do Same as above // Removed for code clarity
                }
                mLastPage = position;
            }
        });
}
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