我应该如何选择一个标签在TabLayout编程?
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
我应该如何选择一个标签在TabLayout编程?
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
当前回答
这将不工作的应用程序,有ViewPager2实现,为此,你需要使用
viewPager2.setCurrentItem(position);
当我们使用TabLayoutMediator时,在onConfigureTab中找到onConfigureTab
i.e
TabLayoutMediator tabLayoutMediator = new TabLayoutMediator(
tabLayout, viewPager2, new TabLayoutMediator.TabConfigurationStrategy() {
@Override
public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
switch (position){
case 0 : tab.setIcon(getResources().getDrawable(R.drawable.camera));
break;
case 1 : tab.setText("CHAT");
viewPager2.setCurrentItem(position); // when app starts this will be the selected tab
break;
case 2 : tab.setText("STATUS");
break;
case 3 : tab.setText("CALL");
break;
}
}
}
);
tabLayoutMediator.attach();
其他回答
如果你不能使用tab.select(),也不想使用ViewPager,你仍然可以通过编程方式选择一个选项卡。如果你通过TabLayout使用自定义视图。选项卡setCustomView (android.view。View View)它更简单。以下是如何做到这两种方式。
// if you've set a custom view
void updateTabSelection(int position) {
// get the position of the currently selected tab and set selected to false
mTabLayout.getTabAt(mTabLayout.getSelectedTabPosition()).getCustomView().setSelected(false);
// set selected to true on the desired tab
mTabLayout.getTabAt(position).getCustomView().setSelected(true);
// move the selection indicator
mTabLayout.setScrollPosition(position, 0, true);
// ... your logic to swap out your fragments
}
如果你不使用自定义视图,那么你可以这样做
// if you are not using a custom view
void updateTabSelection(int position) {
// get a reference to the tabs container view
LinearLayout ll = (LinearLayout) mTabLayout.getChildAt(0);
// get the child view at the position of the currently selected tab and set selected to false
ll.getChildAt(mTabLayout.getSelectedTabPosition()).setSelected(false);
// get the child view at the new selected position and set selected to true
ll.getChildAt(position).setSelected(true);
// move the selection indicator
mTabLayout.setScrollPosition(position, 0, true);
// ... your logic to swap out your fragments
}
使用StateListDrawable在选中和未选中的可绘制对象之间切换,或者类似地处理颜色和/或可绘制对象。
试试这个
new Handler().postDelayed(
new Runnable(){
@Override
public void run() {
if (i == 1){
tabLayout.getTabAt(0).select();
} else if (i == 2){
tabLayout.getTabAt(1).select();
}
}
}, 100);
试试这个方法。
tabLayout.setTabTextColors(getResources().getColor(R.color.colorHintTextLight),
getResources().getColor(R.color.colorPrimaryTextLight));
Kotlin \用户:
Handler(Looper.getMainLooper()).postDelayed(
{ tabLayout.getTabAt(position).select() }, 100
)
这也将滚动你的标签布局,如果它需要滚动。
对于Viewpager2, Kotlin,其他答案都没有帮助,只有下面这个有用。位置是从片段结果监听器在我的情况下:
TabLayoutMediator(binding.tabLayout, binding.viewPager2) { _, _ ->
binding.viewPager2 = position
}.attach()