SlidingMenu和ViewPager联合使用，viewPager丢失数据

Will Wang' 2016-04-28 04:41:04

求助大神帮我看看，问题在哪里，
我使用的是SlidingMenu和ViewPager，正如图片上的情况，我第一次访问有viewpager的页面，可以正常显示，第二次再次访问，数据就会丢失，显示为空，这是怎么回事。
先谢谢各位打神了，万分感谢。

源代码如下

主活动的代码如下：

package com.lingzhuo.testslidingmenu02;



import android.app.Activity;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.FrameLayout;

import android.widget.TextView;

import android.widget.Toast;



import com.jeremyfeinstein.slidingmenu.lib.SlidingMenu;

import com.jeremyfeinstein.slidingmenu.lib.app.SlidingFragmentActivity;

import com.lingzhuo.testslidingmenu02.fragment.FragmentFun;

import com.lingzhuo.testslidingmenu02.fragment.FragmentGame;

import com.lingzhuo.testslidingmenu02.fragment.FragmentNews;

import com.lingzhuo.testslidingmenu02.fragment.FragmentThing;



import org.w3c.dom.Text;



import java.util.ArrayList;

import java.util.List;



public class MainActivity extends AppCompatActivity implements View.OnClickListener{



    private SlidingMenu slidingMenu;

    private TitleView titleView;

    private Button button_top;

    private TextView textView_top;

    private FragmentManager manager;

    private Button button_news,button_game,button_fun,button_thing;

    private Fragment fragment_news,fragment_game,fragment_fun,fragment_thing;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        init();

        initListener();

        initSlidingMenu();

        manager = getSupportFragmentManager();

        FragmentTransaction transaction = manager.beginTransaction();

        transaction.add(R.id.frameLayout_main, fragment_news, "lifecycle");

        transaction.commit();

        textView_top.setText("新闻");

    }



    private void initListener() {

        button_top.setOnClickListener(this);

    }



    private void initSlidingMenu() {

        slidingMenu=new SlidingMenu(this);

        //设置滑动菜单在左边还是右边

        slidingMenu.setMode(SlidingMenu.LEFT);

        // 设置触摸屏幕的模式

        slidingMenu.setTouchModeAbove(SlidingMenu.TOUCHMODE_MARGIN);

        slidingMenu.setShadowWidthRes(R.dimen.shadow_width);

        // 设置滑动菜单视图的宽度

        slidingMenu.setBehindOffsetRes(R.dimen.slidingmenu_offset);

        // 设置渐入渐出效果的值

        slidingMenu.setFadeDegree(0.35f);

        slidingMenu.attachToActivity(this, SlidingMenu.SLIDING_CONTENT);

        //为侧滑菜单设置布局

        slidingMenu.setMenu(R.layout.layout_slidingmenu_left_);







        button_news= (Button) slidingMenu.findViewById(R.id.button_news);

        button_news.setOnClickListener(this);



        button_game= (Button) slidingMenu.findViewById(R.id.button_game);

        button_game.setOnClickListener(this);



        button_fun= (Button) slidingMenu.findViewById(R.id.button_fun);

        button_fun.setOnClickListener(this);



        button_thing= (Button) slidingMenu.findViewById(R.id.button_thing);

        button_thing.setOnClickListener(this);





    }



    private void init() {

        titleView= (TitleView) findViewById(R.id.titleView);

        textView_top= (TextView) titleView.findViewById(R.id.textView_title);

        button_top= (Button) titleView.findViewById(R.id.button_top);



        fragment_news=new FragmentNews();

        fragment_game=new FragmentGame();

        fragment_fun=new FragmentFun();

        fragment_thing=new FragmentThing();



    }



    @Override

    public void onClick(View v) {

        switch (v.getId()){

            case R.id.button_top:

                slidingMenu.toggle();

                break;

            case R.id.button_news:

                fragment_news=new FragmentNews();

                FragmentTransaction transaction_news = manager.beginTransaction();

                transaction_news.replace(R.id.frameLayout_main, fragment_news);

                transaction_news.commit();

                textView_top.setText("新闻");

                break;

            case R.id.button_game:

                fragment_game=new FragmentGame();

                FragmentTransaction transaction_game = manager.beginTransaction();

                transaction_game.replace(R.id.frameLayout_main, fragment_game);

                transaction_game.commit();

                textView_top.setText("游戏");

                break;

            case R.id.button_fun:

                fragment_fun=new FragmentFun();

                FragmentTransaction transaction_fun = manager.beginTransaction();

                transaction_fun.replace(R.id.frameLayout_main, fragment_fun);

                transaction_fun.commit();

                textView_top.setText("娱乐");

                break;

            case R.id.button_thing:

                fragment_thing=new FragmentThing();

                FragmentTransaction transaction_thing = manager.beginTransaction();

                transaction_thing.replace(R.id.frameLayout_main, fragment_thing);

                transaction_thing.commit();

                textView_top.setText("时事");

                break;

        }

    }

}

带有viewPager的fragment代码如下

package com.lingzhuo.testslidingmenu02.fragment;



import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v4.app.Fragment;

import android.support.v4.view.ViewPager;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.Toast;



import com.lingzhuo.testslidingmenu02.R;

import com.lingzhuo.testslidingmenu02.adapter.MyPagerAdapter;



import java.util.ArrayList;

import java.util.List;



/**

 * Created by Wang on 2016/4/28.

 */

public class FragmentGame extends Fragment {

    private List<Fragment> dataList;

    private ViewPager viewPager;



    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        dataList = new ArrayList<>();

        View view = inflater.inflate(R.layout.layout_fragment_game, null);

        viewPager = (ViewPager) view.findViewById(R.id.viewPager_game);

        dataList.add(new FragmentThing());

        dataList.add(new FragmentNews());

        dataList.add(new FragmentNews());

        MyPagerAdapter adapter = new MyPagerAdapter(getFragmentManager(), dataList);

        viewPager.setAdapter(adapter);

        if (viewPager != null) {

            Log.d("FragmentGame", "我被创建了"+dataList.size());

        }

        Button button1 = (Button) view.findViewById(R.id.button1);

        button1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                viewPager.setCurrentItem(0,false);

                Log.d("FragmentGame", "点击事件");

            }

        });

        Button button2 = (Button) view.findViewById(R.id.button2);

        button2.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                viewPager.setCurrentItem(1,false);

                Log.d("FragmentGame", "点击事件");

            }

        });

        Button button3 = (Button) view.findViewById(R.id.button3);

        button3.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                viewPager.setCurrentItem(2,false);

                Log.d("FragmentGame", "点击事件");

            }

        });

        return view;

    }

}