Android:使用Tab检测单个片段viewpager
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我有一个与ViewPager
和FragmentPagerAdapter
安装TabLayout
的问题
TabLayout
工作正常。但是,所有选项卡中的代码同时运行。我希望当前选定的选项卡中的代码能够运行
这是我的活动
package francesco.prisco.siamostudenti.ui;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
import francesco.prisco.siamostudenti.R;
import francesco.prisco.siamostudenti.ui.fragments.CalendarFragment;
import francesco.prisco.siamostudenti.ui.fragments.ChatFragment;
import francesco.prisco.siamostudenti.ui.fragments.EmailFragment;
import francesco.prisco.siamostudenti.ui.fragments.HomeFragment;
import francesco.prisco.siamostudenti.ui.fragments.ProfiloFragment;
public class HomeTabActivity extends AppCompatActivity {
// private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_tab);
// toolbar = (Toolbar) findViewById(R.id.toolbar);
// setSupportActionBar(toolbar);
// getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupTabIcons() {
int[] tabIcons = {
R.drawable.ic_home,
R.drawable.ic_calendar,
R.drawable.ic_chat,
R.drawable.ic_email,
R.drawable.ic_profile
};
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
tabLayout.getTabAt(3).setIcon(tabIcons[3]);
tabLayout.getTabAt(4).setIcon(tabIcons[4]);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new HomeFragment(), "HOME");
adapter.addFrag(new CalendarFragment(), "CALENDAR");
adapter.addFrag(new ChatFragment(), "CHAT");
adapter.addFrag(new EmailFragment(), "EMAIL");
adapter.addFrag(new ProfiloFragment(), "PROFILO");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
// return null to display only the icon
return null;
}
}
}
这是一个片段的代码
package francesco.prisco.siamostudenti.ui.fragments;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import francesco.prisco.siamostudenti.R;
import francesco.prisco.siamostudenti.ui.HomeTabActivity;
public class ProfiloFragment extends Fragment {
public ProfiloFragment() {}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_profilo, container, false);
return rootView;
}
}
请帮帮我
就像@Mrugesh Thaker所说的那样,每当Fragment
的onCreateView()
膨胀时,所有View
生命周期函数 - Fragment
等都会被执行。
在这里,每当View
成为当前Fragment
页面的相邻Fragment
时,每个Fragment
的Fragment
都会膨胀。
因此,当它成为当前选择的OnPageChangeListener
页面到HomeTabActivity
时,你应该移动'每个片段需要执行的代码'
在你的ViewPager
,当你设置OnPageChangeListener
,添加一个ViewPager
到yourprivate void setupViewPager(ViewPager viewPager) {
.
.
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener(){
public void onPageScrollStateChanged (int state){
}
public void onPageSelected (int position){
/*
* Define the action to be performed for each page.
* Variable 'position' is the index of the page in the ViewPager
*/
}
public void onPageScrolled (int position, float positionOffset, int positionOffsetPixels){
}
});
}
Learning Resource
qazxswpoi
实际上,查看寻呼机就是这样的。查看寻呼机的主要目的是使用户能够顺利滑动,所以它的作用是,它会创建您一次给出的所有片段,以获得平滑的滑动流程。这实际上是它的局限性,因为片段生命周期的所有方法都是一次调用的。
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