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ナビゲーションドロワーのAndroidメニューオプションが選択されているときに、必要なフラグメントが表示されないのはなぜですか？

debugcn 投稿 Dev
4
アンドリュー

私の場合、プログラムには2つのフラグメントがあり、それぞれが1種類のメッセージ（入力または続行）を担当します。

これらのフラグメントの選択を実装するアダプターがあります。そして、メニュー項目を選択するときに、特定のフラグメントが表示されたことを確認したいと思います。これが私のメインクラスのメニューです。

public class MessageCenter extends AppCompatActivity
        implements Sent.OnFragmentInteractionListener, Received.OnFragmentInteractionListener, OnNavigationItemSelectedListener {


    PagerAdapter mAdapter;
    FrameLayout mPager;
    FragmentManager fragmentManager;
    FragmentTransaction ft;
    TextView txt1, txt2;
    SharedPreferences sp;
    SharedPreferences.Editor editor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_message_center);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MessageCenter.this, WriteResponseMess.class);
                startActivity(intent);
            }
        });

        txt1 = findViewById(R.id.id_app);
        txt2 = findViewById(R.id.name_app);

        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        /*mAdapter = new PagerAdapter(getSupportFragmentManager());
        mPager = findViewById(R.id.frame);*/


        navigationView.getMenu().findItem(R.id.received).setChecked(true);
        fragmentManager = getSupportFragmentManager();
        ft = fragmentManager.beginTransaction();
        ft.replace(R.id.frame, new Received());
        ft.commit();

        getPersonalData();
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            Intent intent = new Intent(MessageCenter.this, MainScreen.class);
            startActivity(intent);
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.home_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.home) {
            Intent intent = new Intent(getApplicationContext(), MainScreen.class);
            startActivity(intent);
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {


        int id = item.getItemId();
        Fragment fragment = null;

            if (id == R.id.received) {
                fragmentManager = getSupportFragmentManager();
                ft = fragmentManager.beginTransaction();
                ft.replace(R.id.frame, new Received());
                ft.commit();
            } else if (id == R.id.sended) {
                fragmentManager = getSupportFragmentManager();
                ft = fragmentManager.beginTransaction();
                ft.replace(R.id.frame, new Sent());
                ft.commit();
            }


        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

    @Override
    public void onFragmentInteraction(Uri uri) {

    }

    @Override
    public void onPointerCaptureChanged(boolean hasCapture) {

    }

}

しかし、フラグメントは1つだけです。着信メッセージですが、発信メッセージには表示されません。多分私はどこかで何かを終えなかったか、どこかで間違いがあります。

どんな助けでも大いに役立つでしょう。ありがとう。

更新

私の送信フラグメント：

public class Sent extends Fragment implements SwipeRefreshLayout.OnRefreshListener {

    private OnFragmentInteractionListener mListener;
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;

    ArrayList<Message> messageArrayList;
    SwipeRefreshLayout mSwipeRefreshLayout;

    private boolean isVisible;
    private boolean isStarted;


    SharedPreferences sp;
    private Context context;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_sent, container, false);
        recyclerView = rootView.findViewById(R.id.list_sen);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mSwipeRefreshLayout = rootView.findViewById(R.id.refresh_1);
        mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.GREEN, Color.BLUE, Color.CYAN);
        mSwipeRefreshLayout.setOnRefreshListener(this);
        return rootView;
    }

    @Override
    public void onRefresh() {
        sent();
    }

    @Override
    public void onStart() {
        super.onStart();
        isStarted = true;
        if (isVisible) {
            sent();
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        isStarted = false;
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        isVisible = isVisibleToUser;
        if (isVisible && isStarted) {
            sent();
        }
    }


    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }

    public void sent() {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://0000/")
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        adapter = null;

        sp = Objects.requireNonNull(context).getSharedPreferences("access_token", 0);


        String a_token = sp.getString("access_token", "");
        APIService mAPIService = retrofit.create(APIService.class);
        mAPIService.getInMess("Bearer " + a_token, 1, 1).enqueue(new Callback<MessageArray>() {
            @Override
            public void onResponse(@NonNull Call<MessageArray> call, @NonNull Response<MessageArray> response) {

                if (response.isSuccessful()) {
                    messageArrayList = (ArrayList<Message>) Objects.requireNonNull(response.body()).getMessages();
                    adapter = new MessageAdapter2(messageArrayList, getActivity());
                    recyclerView.setAdapter(adapter);
                    mSwipeRefreshLayout.setRefreshing(false);


                } else {
                    ResponseBody errorBody = response.errorBody();
                    try {

                        if (Objects.requireNonNull(errorBody).string().contains("access_token_expired")) {
                            updateToken();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            @Override
            public void onFailure(@NonNull Call<MessageArray> call, @NonNull Throwable t) {

            }
        });
    }

    public void updateToken() {

    }


    public void logOut() {


    }


    @Override
    public void onAttach(Context context) {

        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
        this.context = context;
    }


    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

受け取ったfragentコード：

public class Received extends Fragment implements SwipeRefreshLayout.OnRefreshListener {

    private OnFragmentInteractionListener mListener;
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    ArrayList<Message> messageArrayList;
    SwipeRefreshLayout mSwipeRefreshLayout;
    SharedPreferences sp;

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_received, container, false);
        recyclerView = rootView.findViewById(R.id.list_res);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        received();
        mSwipeRefreshLayout = rootView.findViewById(R.id.refresh_2);
        mSwipeRefreshLayout.setColorSchemeColors(Color.RED, Color.GREEN, Color.BLUE, Color.CYAN);
        mSwipeRefreshLayout.setOnRefreshListener(this);
        return rootView;
    }

    @Override
    public void onRefresh() {
        received();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }

    public void received() {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://0000/")
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        adapter = null;

        sp = Objects.requireNonNull(getActivity()).getSharedPreferences("access_token", 0);
        String a_token = sp.getString("access_token", "");

        final APIService mAPIService = retrofit.create(APIService.class);
        mAPIService.getInMess("Bearer " + a_token, 0, 1).enqueue(new Callback<MessageArray>() {

            @Override
            public void onResponse(@NonNull Call<MessageArray> call, @NonNull Response<MessageArray> response) {
                if (response.isSuccessful()) {
                    messageArrayList = (ArrayList<Message>) Objects.requireNonNull(response.body()).getMessages();
                    adapter = new MessageAdapter(messageArrayList, getActivity());
                    recyclerView.setAdapter(adapter);
                    mSwipeRefreshLayout.setRefreshing(false);

                } else {
                    ResponseBody errorBody = response.errorBody();
                    try {
                        if (Objects.requireNonNull(errorBody).string().contains("access_token_expired")) {
                            updateToken();

                        } else if (errorBody.string().contains("invalid_token")) {
                            updateToken();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            @Override
            public void onFailure(@NonNull Call<MessageArray> call, @NonNull Throwable t) {


            }
        });
    }

    public void updateToken() {


    }


    public void logOut() {

    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}
Ümañgßürmån

解決：

まず、2つのグローバルクラスを宣言します。

public Class fragmentClass;
public Fragment fragment;  // v4.Fragment not the app.Fragment

第二に、

fragmentClass = VendorDriverFragment.class;
try {
    fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
    e.printStackTrace();
}
getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).commit();

したがって、上記の戦略に応じて、次のように変更します。

    int id = item.getItemId();

    if (id == R.id.received) {

        fragmentClass = Recieved.class;
        try {
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).commit();

    } 
    else if (id == R.id.sended) {

        fragmentClass = Sent.class;
        try {
            fragment = (Fragment) fragmentClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).commit();
    }

これらの2つのクラスをパブリックとして宣言することを忘れないでください。

これは私にとってはうまくいきます。試してみてください。問題が発生した場合は、コメントしてください。

この記事はインターネットから収集されたものであり、転載の際にはソースを示してください。

侵害の場合は、連絡してください[email protected]

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