先把代码放上
package com.xcf.admin.couldclass.Activitys.Main;
import android.content.Intent;
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.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Switch;
import com.xcf.admin.couldclass.Activitys.Base.BaseFragment;
import com.xcf.admin.couldclass.Activitys.Exam.ExamAddActivity;
import com.xcf.admin.couldclass.R;
import java.util.ArrayList;
import java.util.List;
import static io.vov.vitamio.utils.Log.TAG;
/**
* Created by mayiyahei on 2019/1/10.
*/
public class FragmentStudy3 extends BaseFragment implements ViewPager.OnPageChangeListener{
private ViewPager my_viewpager;
private TabLayout my_tab;
private List fragments;
private List titles;
private View myview;
private Menu Mmenu;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (myview == null) {
myview = inflater.inflate(R.layout.fragment_study, container, false);
}
initView();
return myview;
}
private void initView() {
my_tab=(TabLayout) myview.findViewById(R.id.my_tab);
my_viewpager=(ViewPager) myview.findViewById(R.id.my_viewpager);
fragments=new ArrayList<>(); //碎片的集合
fragments.add(new FragmentStudy());
fragments.add(new FragmentStudy4());
titles=new ArrayList<>();
titles.add("顺序练习");//标题的集合
titles.add("随机练习");
MyAdapter adapter=new MyAdapter(getChildFragmentManager());
my_viewpager.setAdapter(adapter);
my_tab.setupWithViewPager(my_viewpager); //关联TabLayout和ViewPager
my_viewpager.addOnPageChangeListener(this);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true); // 这是关键的一句
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
Mmenu = menu;
menu.clear();
inflater.inflate(R.menu.add_study_menu, menu);//加载menu文件到布局
// Intent intent = new Intent(getActivity(), ExamAddActivity.class);
// startActivity(intent);
}
@Override
public void onPrepareOptionsMenu(Menu menu) {
// 动态设置ToolBar状态
switch (my_viewpager.getCurrentItem()) {
case 0:
menu.findItem(R.id.save_select_ter).setVisible(true);
break;
case 1:
menu.findItem(R.id.save_select_ter).setVisible(false);
break;
}
super.onPrepareOptionsMenu(menu);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// getWindow().invalidatePanelMenu(Window.FEATURE_OPTIONS_PANEL);
switch (position){
case 0:
getActivity().invalidateOptionsMenu();
Log.e(TAG, "onPageSelected: 进入的是0界面" );
break;
case 1:
getActivity().invalidateOptionsMenu();
Log.e(TAG, "onPageSelected: 进入的是1界面" );
break;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.save_select_ter:
//Toast.makeText(getActivity(), "你点击了 添加！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getActivity(), ExamAddActivity.class);
intent.putExtra("erpapertype", "1");
startActivityForResult(intent, 1);
break;
default:
break;
}
return true;
}
@Override
public void onPageScrollStateChanged(int state) {
}
private class MyAdapter extends FragmentPagerAdapter { //适配器
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return fragments.get(position); //返回碎片集合的第几项
}
@Override
public int getCount() {
return fragments.size(); //返回碎片集合大小
}
@Override
public CharSequence getPageTitle(int position) {
return titles.get(position); //返回标题的第几项
}
}
}
1.引入依赖库
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:support-v4:25.3.1'
2.xml布局文件
3.Activity实现
private void initView() {
my_tab=(TabLayout) myview.findViewById(R.id.my_tab);
my_viewpager=(ViewPager) myview.findViewById(R.id.my_viewpager);
fragments=new ArrayList<>(); //碎片的集合
fragments.add(new FragmentStudy());
fragments.add(new FragmentStudy4());
titles=new ArrayList<>();
titles.add("顺序练习");//标题的集合
titles.add("随机练习");
MyAdapter adapter=new MyAdapter(getChildFragmentManager());
my_viewpager.setAdapter(adapter);
my_tab.setupWithViewPager(my_viewpager); //关联TabLayout和ViewPager
my_viewpager.addOnPageChangeListener(this);
}
4.适配器Adapter
private class MyAdapter extends FragmentPagerAdapter { //适配器
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return fragments.get(position); //返回碎片集合的第几项
}
@Override
public int getCount() {
return fragments.size(); //返回碎片集合大小
}
@Override
public CharSequence getPageTitle(int position) {
return titles.get(position); //返回标题的第几项
}
}
5.如果android app分为4个fragment,fragment1、fragment2、fragment3、fragment4 4个页面，并且fragment1内部又拥有2个fragment页面时候，此时app的actionbar的menu菜单会混乱。解决办法是在fragment1上控制他的子界面的menu菜单：
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
Mmenu = menu;
menu.clear();
inflater.inflate(R.menu.add_study_menu, menu);//加载menu文件到布局
// Intent intent = new Intent(getActivity(), ExamAddActivity.class);
// startActivity(intent);
}
@Override
public void onPrepareOptionsMenu(Menu menu) {
// 动态设置ToolBar状态
switch (my_viewpager.getCurrentItem()) {
case 0:
menu.findItem(R.id.save_select_ter).setVisible(true);
break;
case 1:
menu.findItem(R.id.save_select_ter).setVisible(false);
break;
}
super.onPrepareOptionsMenu(menu);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// getWindow().invalidatePanelMenu(Window.FEATURE_OPTIONS_PANEL);
switch (position){
case 0:
getActivity().invalidateOptionsMenu();//此方法会回调onPrepareOptionsMenu方法；
Log.e(TAG, "onPageSelected: 进入的是0界面" );
break;
case 1:
getActivity().invalidateOptionsMenu();
Log.e(TAG, "onPageSelected: 进入的是1界面" );
break;
}
}