Android 如何获取已选择的片段
我正在使用片段创建一个选项卡应用程序 我已经成功创建了选项卡,但现在我需要在选择特定片段时创建一个对象。e、 g.当我选择Android 如何获取已选择的片段,android,android-fragments,android-tabs,Android,Android Fragments,Android Tabs,我正在使用片段创建一个选项卡应用程序 我已经成功创建了选项卡,但现在我需要在选择特定片段时创建一个对象。e、 g.当我选择SettingsTab时,我需要调用测试类中定义的函数。同样的破坏 // SettingsTab package com.example.sensorspositioningn; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import
SettingsTab
时,我需要调用测试类中定义的函数。同样的破坏
// SettingsTab
package com.example.sensorspositioningn;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class SettingsTab extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.settingstab, container, false);
}
}
以下是mainActivity中的代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
appContext = getApplicationContext();
//ActionBar
ActionBar actionbar = getActionBar();
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab Tab1= actionbar.newTab().setText("Tab1");
ActionBar.Tab Tab2= actionbar.newTab().setText("Tab2");
ActionBar.Tab Tab3= actionbar.newTab().setText("Tab3");
ActionBar.Tab SettingsTab = actionbar.newTab().setText("Settings");
Fragment Tab1F= new Tab1();
Fragment Tab2F= new Tab2();
Fragment Tab3F= new Tab3();
Fragment mSettingsFragment = new SettingsTab();
Tab1.setTabListener(new MyTabsListener(Tab1F));
Tab1.setTabListener(new MyTabsListener(Tab2F));
Tab1.setTabListener(new MyTabsListener(Tab3F));
SettingsTab.setTabListener(new MyTabsListener(mSettingsFragment));
actionbar.addTab(Tab1);
actionbar.addTab(Tab2);
actionbar.addTab(Tab3);
actionbar.addTab(SettingsTab);
}
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}
class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(MainActivity.appContext, "Reselected!", Toast.LENGTH_LONG).show();
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(fragment);
}
}
试试这个
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
if(fragment instanceof SettingsTab){
doSettingsMethod();
}
if(fragment instanceof Tab1){
doOtherMethod1();
}
if(fragment instanceof Tab2){
doOtherMethod2();
}
if(fragment instanceof Tab3){
doOtherMethod3();
}
}
您也可以用这种方式更改TabListener类。对我来说,这是一个更好的设计
class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;
private final Runnable onSelect;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
this.onSelect = null;
}
public MyTabsListener(Fragment fragment, Runnable onSelect) {
this.fragment = fragment;
this.onSelect = onSelect;
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(MainActivity.appContext, "Reselected!", Toast.LENGTH_LONG).show();
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
if(onSelect != null){
fragment.getActivity().runOnUiThread(onSelect);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(fragment);
}
}
在您的ActionBar.TabListener
中,您可以这样做-(我假设您需要对象位于活动中
)
我在开发者网站上找到的唯一官方信息来源是:
他们只需为每个创建的片段放置参数,并在选择片段时读取参数。默认情况下,如果选择选项卡,它将高亮显示。如果要显式选择,则意味着使用onTabSelected(TabLayout.Tab Tab)下的给定注释代码和指定的选项卡索引位置。此代码将解释如何使用viewpager更改选项卡所选位置上的片段
public class GalleryFragment extends Fragment implements TabLayout.OnTabSelectedListener
{
private ViewPager viewPager;public ViewPagerAdapter adapter;private TabLayout tabLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_gallery, container, false);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
adapter = new ViewPagerAdapter(getChildFragmentManager());
adapter.addFragment(new PaymentCardFragment(), "PAYMENT CARDS");
adapter.addFragment(new LoyaltyCardFragment(), "LOYALTY CARDS");
viewPager.setAdapter(adapter);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(this);
}
@Override
public void onTabSelected(TabLayout.Tab tab) {
//This will be called 2nd when you select a tab or swipe using viewpager
final int position = tab.getPosition();
Log.i("card", "Tablayout pos: " + position);
//TabLayout.Tab tabdata=tabLayout.getTabAt(position);
//tabdata.select();
tabLayout.post(new Runnable() {
@Override
public void run() {
if (position == 0) {
PaymentCardFragment paymentCardFragment = getPaymentCardFragment();
if (paymentCardFragment != null) {
VerticalViewpager vp = paymentCardFragment.mypager;
if(vp!=null)
{
//vp.setCurrentItem(position,true);
vp.setCurrentItem(vp.getAdapter().getCount()-1,true);
}
}
}
if (position == 1) {
LoyaltyCardFragment loyaltyCardFragment = getLoyaltyCardFragment();
if (loyaltyCardFragment != null) {
VerticalViewpager vp = loyaltyCardFragment.mypager;
if(vp!=null)
{
vp.setCurrentItem(position);
}
}
}
}
});
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
//This will be called 1st when you select a tab or swipe using viewpager
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
//This will be called only when you select the already selected tab(Ex: selecting 3rd tab again and again)
}
private PaymentCardFragment getLoyaltyCardFragment() {
Fragment f = adapter.mFragmentList.get(viewPager.getCurrentItem());
if(f instanceof PaymentCardFragment)
{
return (PaymentCardFragment) f;
}
return null;
}
private LoyaltyCardFragment getPaymentCardFragment() {
Fragment f = adapter.mFragmentList.get(viewPager.getCurrentItem());
if(f instanceof LoyaltyCardFragment)
{
return (LoyaltyCardFragment) f;
}
return null;
}
class ViewPagerAdapter extends FragmentPagerAdapter {
public List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
}
公共类GalleryFragment扩展片段实现TabLayout.OnTabSelectedListener
{
专用ViewPager ViewPager;公用ViewPagerAdapter适配器;专用表格布局;
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
视图根视图=充气机。充气(R.layout.fragment\u画廊,容器,假);
viewPager=(viewPager)rootView.findViewById(R.id.viewPager);
适配器=新的ViewPagerAdapter(getChildFragmentManager());
addFragment(新的PaymentCardFragment(),“支付卡”);
addFragment(新的忠诚卡片段(),“忠诚卡”);
viewPager.setAdapter(适配器);
tabLayout=(tabLayout)rootView.findviewbyd(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setontAbsSelectedListener(此);
}
@凌驾
已选择的公共选项卡(TabLayout.Tab){
//当您选择选项卡或使用viewpager刷卡时,这将被称为第二个
final int position=tab.getPosition();
Log.i(“卡片”,“表格布局位置:+位置”);
//TabLayout.Tab tabdata=TabLayout.getTabAt(位置);
//tabdata.select();
tabLayout.post(新的Runnable(){
@凌驾
公开募捐{
如果(位置==0){
PaymentCardFragment PaymentCardFragment=getPaymentCardFragment();
如果(paymentCardFragment!=null){
VerticalViewpager vp=paymentCardFragment.mypager;
如果(vp!=null)
{
//vp.setCurrentItem(位置,真);
vp.setCurrentItem(vp.getAdapter().getCount()-1,true);
}
}
}
如果(位置==1){
LoyaltyCardFragment-LoyaltyCardFragment=getLoyaltyCardFragment();
if(忠诚CardFragment!=null){
VerticalViewpager vp=loyaltyCardFragment.mypager;
如果(vp!=null)
{
副总裁setCurrentItem(职位);
}
}
}
}
});
}
@凌驾
已选择的公共选项卡(TabLayout.Tab){
//当您选择选项卡或使用viewpager滑动时,这将被称为“第一”
}
@凌驾
已重新选择公共选项卡(TabLayout.Tab){
//仅当您选择已选择的选项卡时才会调用此选项(例如:反复选择第三个选项卡)
}
私人支付卡片段getLoyaltyCardFragment(){
片段f=adapter.mfFragmentList.get(viewPager.getCurrentItem());
if(f付款卡片段实例)
{
返回(PaymentCardFragment)f;
}
返回null;
}
私人忠诚CardFragment getPaymentCardFragment(){
片段f=adapter.mfFragmentList.get(viewPager.getCurrentItem());
if(f忠诚卡片段实例)
{
返回(忠诚卡碎片)f;
}
返回null;
}
类ViewPagerAdapter扩展了FragmentPagerAdapter{
public List mffragmentlist=new ArrayList();
私有最终列表MFFragmentTitleList=new ArrayList();
public void addFragment(片段片段,字符串标题){
添加(片段);
MFFragmentTitleList.add(标题);
}
}
}
请解释您的问题,清楚您想要什么?
public class GalleryFragment extends Fragment implements TabLayout.OnTabSelectedListener
{
private ViewPager viewPager;public ViewPagerAdapter adapter;private TabLayout tabLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_gallery, container, false);
viewPager = (ViewPager) rootView.findViewById(R.id.viewpager);
adapter = new ViewPagerAdapter(getChildFragmentManager());
adapter.addFragment(new PaymentCardFragment(), "PAYMENT CARDS");
adapter.addFragment(new LoyaltyCardFragment(), "LOYALTY CARDS");
viewPager.setAdapter(adapter);
tabLayout = (TabLayout) rootView.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(this);
}
@Override
public void onTabSelected(TabLayout.Tab tab) {
//This will be called 2nd when you select a tab or swipe using viewpager
final int position = tab.getPosition();
Log.i("card", "Tablayout pos: " + position);
//TabLayout.Tab tabdata=tabLayout.getTabAt(position);
//tabdata.select();
tabLayout.post(new Runnable() {
@Override
public void run() {
if (position == 0) {
PaymentCardFragment paymentCardFragment = getPaymentCardFragment();
if (paymentCardFragment != null) {
VerticalViewpager vp = paymentCardFragment.mypager;
if(vp!=null)
{
//vp.setCurrentItem(position,true);
vp.setCurrentItem(vp.getAdapter().getCount()-1,true);
}
}
}
if (position == 1) {
LoyaltyCardFragment loyaltyCardFragment = getLoyaltyCardFragment();
if (loyaltyCardFragment != null) {
VerticalViewpager vp = loyaltyCardFragment.mypager;
if(vp!=null)
{
vp.setCurrentItem(position);
}
}
}
}
});
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
//This will be called 1st when you select a tab or swipe using viewpager
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
//This will be called only when you select the already selected tab(Ex: selecting 3rd tab again and again)
}
private PaymentCardFragment getLoyaltyCardFragment() {
Fragment f = adapter.mFragmentList.get(viewPager.getCurrentItem());
if(f instanceof PaymentCardFragment)
{
return (PaymentCardFragment) f;
}
return null;
}
private LoyaltyCardFragment getPaymentCardFragment() {
Fragment f = adapter.mFragmentList.get(viewPager.getCurrentItem());
if(f instanceof LoyaltyCardFragment)
{
return (LoyaltyCardFragment) f;
}
return null;
}
class ViewPagerAdapter extends FragmentPagerAdapter {
public List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
}