我在 android studio 中创建了选项卡式视图,但是我遇到了一个问题,当我从主页滑动到类别或收藏时,我将图标放在文本标题主页、类别和收藏的上方它工作正常,但是当我调用此方法时,图标仅显示一次,当我打开应用程序并滑动到另一个类时,它们会消失
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
viewPager.getAdapter().notifyDataSetChanged();
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
这就是我调用图标的方法
setupTabIcons();
查看整个部分并帮助我,请我该怎么做
viewPager = (ViewPager) findViewById(R.id.container);
setupViewPager(viewPager);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
viewPager.getAdapter().notifyDataSetChanged();
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
tabLayout.getSelectedTabPosition();
if (tab.getText().equals("Categories")) {
currentFragment = "Categories";
LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(MainActivity.this);
Intent i = new Intent("TAG_REFRESH");
lbm.sendBroadcast(i);
} else {
currentFragment = "check_internet_connection";
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
setupTabIcons();
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new HomeFragment(), "Home");
adapter.addFragment(new Category(), "Categories");
adapter.addFragment(new Favorite(), "Favorite");
viewPager.setAdapter(adapter);
}