单击RecyclerView中包含在片段中的项目以打开带有传递数据的新活动

Question

我在三个片段中都有一个MainActivity和三个带有recyclerViews的片段，recyclerview包含两个textview，我希望用户单击recyclerview并将其中的文本传递给新活动，我有点新，所以我如果您能给我详细的代码和一些解释，将不胜感激。

我想在recyclerview中单击一个项目，这应该打开一个新活动，数据（文本）应该从recyclerview传递到新活动。

这是我的HymnModel.java代码

public class HymnModel {

String title;
String song;


HymnModel(String title, String song){
    this.title=title;
    this.song=song;
}

public String getTitle() {return title;
}

public String getSong() {
    return song;
}
}

这是ItemVeiwHolder.java的代码

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
import com.tutorialsbuzz.recyclerview.R;

public class ItemViewHolder extends RecyclerView.ViewHolder {

public TextView title_textview;
public TextView song_textview;



public ItemViewHolder(View itemView) {
    super(itemView);
    itemView.setClickable(true);
    title_textview = (TextView) itemView.findViewById(R.id.song_title);
    song_textview = (TextView) itemView.findViewById(R.id.song);

}

public void bind(HymnModel hymnModel) {
    title_textview.setText(hymnModel.getTitle());
    song_textview.setText(hymnModel.getSong());

}


}

这是我的适配器类

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.tutorialsbuzz.recyclerview.R;
import java.util.ArrayList;
import java.util.List;

public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> {

private List<HymnModel> mCountryModel;
private List<HymnModel> mOriginalCountryModel;

public RVAdapter(List<HymnModel> mCountryModel) {
    this.mCountryModel = mCountryModel;
    this.mOriginalCountryModel = mCountryModel;
}

@Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) {
    final HymnModel model = mCountryModel.get(i);
    itemViewHolder.bind(model);
}

@Override
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, viewGroup, false);
    return new ItemViewHolder(view);
}

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

public void setFilter(List<HymnModel> countryModels){
    mCountryModel = new ArrayList<>();
    mCountryModel.addAll(countryModels);
    notifyDataSetChanged();
}

 }

这是我的一个片段的代码

public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener {

private RecyclerView recyclerview;
private List<HymnModel> mHymnModel;
private RVAdapter adapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

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

    View view = inflater.inflate(R.layout.tab_one_fragment, container, false);

    recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    recyclerview.setLayoutManager(layoutManager);

    return view;
}


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

    setHasOptionsMenu(true);
    int numOfSongs = 32;


    DisplayMetrics metrics = new DisplayMetrics();
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

    int height = metrics.heightPixels;
    int width = metrics.widthPixels;

    String [] titles = {HymnTitles.hymnTitle1, HymnTitles.hymnTitle2, HymnTitles.hymnTitle3, HymnTitles.hymnTitle4, HymnTitles.hymnTitle5,
            HymnTitles.hymnTitle6, HymnTitles.hymnTitle7, HymnTitles.hymnTitle8, HymnTitles.hymnTitle9, HymnTitles.hymnTitle10, HymnTitles.hymnTitle11,
            HymnTitles.hymnTitle12};

    String [] songs = {Hymns.hymn1.substring(width/5), Hymns.hymn2, Hymns.hymn3, Hymns.hymn4, Hymns.hymn5, Hymns.hymn6, Hymns.hymn7, Hymns.hymn8, Hymns.hymn9, Hymns.hymn10, Hymns.hymn11, Hymns.hymn12};

    mHymnModel = new ArrayList<>();



    for (int i = 0; i < titles.length; i++) {
        mHymnModel.add(new HymnModel(i + "." + " " + titles[i], "  " + songs[i]));
    }

    adapter = new RVAdapter(mHymnModel);
    recyclerview.setAdapter(adapter);
}


@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_main, menu);

    final MenuItem item = menu.findItem(R.id.action_search);
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
    searchView.setOnQueryTextListener(this);

    MenuItemCompat.setOnActionExpandListener(item,
            new MenuItemCompat.OnActionExpandListener() {
                @Override
                public boolean onMenuItemActionCollapse(MenuItem item) {
                    // Do something when collapsed
                    adapter.setFilter(mHymnModel);
                    return true; // Return true to collapse action view
                }

                @Override
                public boolean onMenuItemActionExpand(MenuItem item) {
                    // Do something when expanded
                    return true; // Return true to expand action view
                }
            });
}

@Override
public boolean onQueryTextChange(String newText) {
    final List<HymnModel> filteredModelList = filter(mHymnModel, newText);
    adapter.setFilter(filteredModelList);
    return true;
}

@Override
public boolean onQueryTextSubmit(String query) {
    return false;
}


private List<HymnModel> filter(List<HymnModel> models, String query) {
    query = query.toLowerCase();

    final List<HymnModel> filteredModelList = new ArrayList<>();
    for (HymnModel model : models) {
        final String text = model.getSong().toLowerCase();
        if (text.contains(query)) {
            filteredModelList.add(model);
        }
    }
    return filteredModelList;
}

 }

我的主要活动

public class MainActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

private int[] tabIcons = {
        R.drawable.ic_action_person,
        R.drawable.ic_action_group,
        R.drawable.ic_action_call
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();

    actionBar.setDisplayHomeAsUpEnabled(true);


    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tablayout);
    tabLayout.setupWithViewPager(viewPager);

}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new TabOneFragment(), "Tab 1");
    adapter.addFragment(new TabTwoFragment(), "Tab 2");
    adapter.addFragment(new TabThreeFragment(), "Tab 3");
    viewPager.setAdapter(adapter);

}


}

最后是我的ViewPageAdapter

   public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
}

谢谢。

Answer 1

1. 创建一个界面

    public interface OnHymnClickListener { void onHymnClick(HymnModel hymnModel); } 

2. 将监听器传递给适配器

    public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> { private OnHymnClickListener listener; public void setListener(OnHymnClickListener listener) { this.listener = listener; } @Override public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) { final HymnModel model = mCountryModel.get(i); itemViewHolder.bind(model); itemViewHolder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(listener != null) { listener.onHymnClick(model); } } }); } } 

3. 让您的片段实现它

    public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener, OnHymnClickListener { @Override public void onHymnClick(HymnModel hymnModel) { //put data to bundle and startActivity } @Override public void onViewCreated(View view, Bundle savedInstanceState) { adapter = new RVAdapter(mHymnModel); adapter.setListener(this); recyclerview.setAdapter(adapter); } } 

Answer 2

您好，首先，您始终想从活动或片段开始活动。 切勿从适配器启动它。

因此，在您的适配器构造函数中添加此代码

public AdapterName(......,Context context){
...your code.
this.mContext=context;
}

在那里传递上下文 。

比这个方法里面

public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

view.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        if(mContext instanceof YourActivityName){
            ((YourActivityName)mContext).yourDesiredMethod();
        }
    }
});