android - 如何在 recyclerview OnClick 上打开不同的 fragment

Question

我正在使用 RecyclerView 在我的 Navigation Drawer 中显示我的抽屉列表项。 OnClick 抽屉列表项，我可以打开不同的 Activity ，但是我希望能够打开将替换主要 Activity 布局的 fragment 。

有没有办法做到这一点？

public class AdapterClass extends RecyclerView.Adapter<AdapterClass.MyViewHolder> {
    private LayoutInflater inflater;
    private Context context;
    List<Information> data = Collections.emptyList();

    public AdapterClass(Context context, List<Information> data) {
        this.context = context;

        inflater = LayoutInflater.from(context);
        this.data = data;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.custom_row, parent, false);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Information current = data.get(position);
        holder.title.setText(current.title);
        holder.icon.setImageResource(current.iconId);

    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        TextView title;
        ImageView icon;

        public MyViewHolder(View itemView) {
            super(itemView);
            context = itemView.getContext();
            title = (TextView) itemView.findViewById(R.id.listText);
            icon = (ImageView) itemView.findViewById(R.id.listIcon);
            itemView.setClickable(true);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {

            final Intent intent;
            switch (getPosition()) {
                case 0:
                    intent = new Intent(context, next.class);
                    break;

                case 1:
                    intent = new Intent(context, next.class);
                    break;

                case 2:
                    intent = new Intent(context, next.class);
                    break;
                default:
                    intent = new Intent(context, next.class);
                    break;
            }
            context.startActivity(intent);
        }
    }
};

主 Activity .java

public class MainActivity extends ActionBarActivity {

    private Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = (Toolbar) findViewById(R.id.app_bar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
        drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

NavigationDrawerFragment.java

public class NavigationDrawerFragment extends Fragment {
    private ActionBarDrawerToggle mDrawerToggle;
    private DrawerLayout mDrawerLayout;
    private boolean mUserLearnedDrawer;
    private boolean mFromSavedInstanceState;
    public static final String PREF_FILE_NAME = "testpref";
    public static final String KEY_USER_LEARNED_DRAWER = "user_learned_drawer";
    private View containerView;
    private AdapterClass adapter;
    private RecyclerView recyclerView;

    public NavigationDrawerFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mUserLearnedDrawer = Boolean.valueOf(readFromPreferences(getActivity(), KEY_USER_LEARNED_DRAWER, "false"));
        if (savedInstanceState != null) {
            mFromSavedInstanceState = true;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
        recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);

        adapter = new AdapterClass(getActivity(), getData());
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        return layout;
    }

    public static List<Information> getData() {
        List<Information> data = new ArrayList<>();
        int[] icons = {R.drawable.ic_menu_check, R.drawable.ic_menu_check, R.drawable.ic_menu_check, R.drawable.ic_menu_check};
        String[] titles = {"My Cart", "Lotion", "Deodorants", "Gels"};

        for (int i = 0; i < titles.length && i < icons.length; i++) {
            Information current = new Information();
            current.iconId = icons[i];
            current.title = titles[i];
            data.add(current);
        }
        return data;
    }

    public void setUp(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {
        containerView = getActivity().findViewById(fragmentId);
        mDrawerLayout = drawerLayout;
        mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if (!mUserLearnedDrawer) {
                    mUserLearnedDrawer = true;
                    saveToPreferences(getActivity(), KEY_USER_LEARNED_DRAWER, mUserLearnedDrawer + "");
                }

            }


            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);


            }

        };
        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
            mDrawerLayout.openDrawer(containerView);
        }
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });
    }


    @TargetApi(Build.VERSION_CODES.GINGERBREAD)
    public static void saveToPreferences(Context context, String preferenceName, String preferenceValue) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(preferenceName, preferenceValue);
        editor.apply();
    }

    public static String readFromPreferences(Context context, String preferenceName, String defaultValue) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME, Context.MODE_PRIVATE);
        return sharedPreferences.getString(preferenceName, defaultValue);
    }
}

Answer 1

如此简化的版本，这是我的 onbindVH:

 @Override
    public void onBindViewHolder(FeedsViewHolder holder, int position) {
        final Feed item = mFeeds.get(position);

        holder.textView1.setText(item.getText());
        holder.imageView.setImageDrawable(mContext.getResources().getDrawable(item.getImage));
        holder.imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                fragmentJump(item);
            }
        });
    }

这里是 fragmentJump:

private void fragmentJump(Feed mItemSelected) {
    mFragment = new Fragment2();
    mBundle = new Bundle();
    mBundle.putParcelable("item_selected_key", mItemSelected);
    mFragment.setArguments(mBundle);
    switchContent(R.id.frag1, mFragment);
}

这是适配器上的 switchContent:

public void switchContent(int id, Fragment fragment) {
    if (mContext == null)
        return;
    if (mContext instanceof MainActivity) {
        MainActivity mainActivity = (MainActivity) mContext;
        Fragment frag = fragment;
        mainActivity.switchContent(id, frag);
    }

}

最后，这是 MainActivity 上的 switchContent:

public void switchContent(int id, Fragment fragment) {
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.replace(id, fragment, fragment.toString());
    ft.addToBackStack(null);
    ft.commit();
}

我知道它仍然可以简化，但它按原样工作。我希望它有所帮助。 :)