android - Android 片段：重叠 - 替换后仍然可见

Question

我有一个片段（PokedexFragment.java），其中包含一个带有一些项目的 GridView（通过自定义 Recyclerview）。当我单击一个项目时，当前片段将被另一个片段（SinglePokemonFragment.java）替换，其中包含所选项目的详细信息。用户想直接转到网格视图中的最后一项或下一项（按前进/后退按钮）。当他按下硬件“后退按钮”时，旧片段 (SinglePokemonFragment.java) 仍然可见！

我不喜欢使用 addBackStack，因为不应该有任何 backstacks。

代码的哪一部分是错误的或必须更新，为什么？我以为替换意味着替换...

SinglePokemonFragment.java（按钮）

cLayBack.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        // Create new fragment and transaction
        Fragment newFragment = new SinglePokemonFragment();
        FragmentTransaction transaction = getFragmentManager().beginTransaction();

        Bundle bundle = new Bundle();

        bundle.putInt("POKEMON_ID", Integer.parseInt(db.getPokemonID(intPokeDexID-1)));
        bundle.putInt("ARRAY_ID", intPokeArrayID-1);
        bundle.putInt("POKEMON_ID_MAX", getIntPokemonIDMax);
        bundle.putInt("POKEDEX_ID", intPokeDexID-1);

        newFragment.setArguments(bundle);
        transaction.replace(R.id.frame_container, newFragment);
        // Commit the transaction
        transaction.commit();

    }
});

cLayForward.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        // Create new fragment and transaction
        Fragment newFragment = new SinglePokemonFragment();
        FragmentTransaction transaction = getFragmentManager().beginTransaction();

        Bundle bundle = new Bundle();

        bundle.putInt("POKEMON_ID", Integer.parseInt(db.getPokemonID(intPokeDexID+1)));
        bundle.putInt("ARRAY_ID", intPokeArrayID+1);
        bundle.putInt("POKEMON_ID_MAX", getIntPokemonIDMax);
        bundle.putInt("POKEDEX_ID", intPokeDexID+1);

        newFragment.setArguments(bundle);
        transaction.replace(R.id.frame_container, newFragment);
        // Commit the transaction
        transaction.commit();
    }
});

MainFragment.java（带有 ViewPager）

public class MainFragment extends Fragment {
    private TextView titleTxtView;
    private static final String ARG_PARAM1 = "param1";
    private String mParam1;
    TabLayout tabLayout;
    ViewPager viewPager;
    private FragmentActivity myContext;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, container, false);

        tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
        viewPager = (ViewPager) view.findViewById(R.id.pager);

        if (viewPager != null) {
            Log.v("ViewPager", "IS NOT NULL");
            setupViewPager(viewPager);
            tabLayout.getTabAt(0).setIcon(R.drawable.ic_pokedex);
            tabLayout.getTabAt(1).setIcon(R.drawable.pokedex_kanto);
            tabLayout.getTabAt(2).setIcon(R.drawable.pokedex_johto);
            tabLayout.getTabAt(3).setIcon(R.drawable.pokedex_hoenn);
        }else{
            Log.v("ViewPager", "ISNULL");
        }



        return view;
    }

    @Override
    public void onAttach(Activity activity) {
        myContext=(FragmentActivity) activity;
        super.onAttach(activity);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
        }
    }

    private void setupViewPager(ViewPager viewPager) {

        PagerAdapter adapter = new PagerAdapter(getChildFragmentManager(), getActivity());
        adapter.addFragment(new PokedexFragment().newInstance(0, 9999), "Alle");
        adapter.addFragment(new PokedexFragment().newInstance(1, 151), "Kanto");
        adapter.addFragment(new PokedexFragment().newInstance(152, 251), "Johto");
        adapter.addFragment(new PokedexFragment().newInstance(252, 386), "Hoenn");

        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);
    }

}

PokedexFragment.java

package com.spicysoftware.goexpert;

import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
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.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toolbar;

import java.util.ArrayList;
import java.util.List;

import static android.content.ContentValues.TAG;

public class PokedexFragment extends Fragment{

    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";
    MySQLiteHelper db;

    // TODO: Rename and change types of parameters
    private int param1, param2;

    public PokedexFragment() {
        // Required empty public constructor

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            param1 = getArguments().getInt(ARG_PARAM1);
            param2 = getArguments().getInt(ARG_PARAM2);
        }
    }

    public static PokedexFragment newInstance(int intDexFrom, int intDexTo) {
        PokedexFragment fragment = new PokedexFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_PARAM1, intDexFrom);
        args.putInt(ARG_PARAM2, intDexTo);
        fragment.setArguments(args);
        Log.d(TAG, "newInstance: 2F");
        return fragment;
    }

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

        // Inflate the layout for this fragment
        View myView = inflater.inflate(R.layout.fragment_pokedexall, container, false);
        db = new MySQLiteHelper(getActivity());

        RecyclerView recyclerView = (RecyclerView)myView.findViewById(R.id.rvPokedex);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(),4);
        recyclerView.setLayoutManager(layoutManager);

        recyclerView.setItemViewCacheSize(20);
        recyclerView.setDrawingCacheEnabled(true);
        recyclerView.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);

        CustomRecyclerAdapterPokedexGrid adapter = new CustomRecyclerAdapterPokedexGrid(getActivity(), db.getPokemon(param1,param2));
        recyclerView.setAdapter(adapter);

        return myView;
    }

}

CustomRecyclerAdapterPokedexGrid.java (ItemClickListener)

viewHolder.setClickListener(new ItemClickListener() {
            @Override
            public void onClick(View view, int position, boolean isLongClick) {

                if (isLongClick) {

                } else {

                    String test = strPokemonInfo.get(i);
                    String[] separated = test.split("/");
                    intPokemonID = Integer.parseInt(separated[0]);
                    pokeDexID = Integer.parseInt(separated[1]);

                    Fragment myFragment = new SinglePokemonFragment();
                    Bundle bundle = new Bundle();

                    bundle.putInt("POKEMON_ID", intPokemonID);
                    bundle.putInt("ARRAY_ID", i);
                    bundle.putInt("POKEMON_ID_MAX", strPokemonInfo.size());
                    bundle.putInt("POKEDEX_ID", pokeDexID);

                    myFragment.setArguments(bundle);
                    AppCompatActivity activity = (AppCompatActivity) view.getContext();
                    activity.getSupportFragmentManager().beginTransaction().replace(R.id.frame_container, myFragment).addToBackStack(null).commit();

                }

            }
        });

标签： androidandroid-fragmentsfragment