Java 通过主要活动'；将数据添加到选项卡片段

我不熟悉android和java，但在我的第一个应用程序中，我正在做play store，这是你在play store上看到的第一件事，然后转到第二个活动，在那里看到整个列表。我已经构建了水平ArrayList，并且成功地构建了第二个活动的

Cardview

，我的ArrayList是静态的，我的意思是它没有使用任何服务器

我的问题是如何通过位于其中的适配器将

MainActivity

的数据发送到

MainActivity2

以下是我的主要活动，我的数据位于此：

public class MainActivity extends AppCompatActivity {

private ArrayList<SectionDataModel> allSampleData;


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

    allSampleData = new ArrayList<>();


    RecyclerView recyclerView = findViewById(R.id.my_recycler_view1);
    recyclerView.setHasFixedSize(true);
    RecyclerViewDataAdapter adapter = new RecyclerViewDataAdapter(allSampleData, this);
    recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
    recyclerView.setAdapter(adapter);


    EssentialData();



}

public void EssentialData() {
    SectionDataModel Unit1 = new SectionDataModel();
    Unit1.setHeaderTitle("Unit 1");


    ArrayList<SingleItemModel> singleItemModels = new ArrayList<>();

    singleItemModels.add(new SingleItemModel("Word ", "Pronunciation", "Example", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.soft));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));
    singleItemModels.add(new SingleItemModel("The Apple", "Apple Store Is Open", "Description book", R.drawable.alferet));


    Unit1.setAllItemInSection(singleItemModels);
    allSampleData.add(Unit1);


}
  }

MainActivity2承载了3个选项卡，其中一个我也需要接收，因为我声明了所有选项卡片段，每个选项卡片段的函数都像MainActivity的适配器（SectionDataAdapter），它将显示ArrayList的项。这意味着我还必须在所有片段中接收MainActivity的ArrayList

这是我的tab1片段：

public class Tab1Fragment extends Fragment {
public Tab1Fragment() {
    // Required empty public constructor
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.tab1_fragment, container, false);
    return view;
}
  }

当然，我的

RecycleServiceAdapter

显示了ArrayList的项

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder0> {
private Context mContext ;
private ArrayList<SingleItemModel> mData ;


//the constructor
public RecyclerViewAdapter(Context mContext, ArrayList<SingleItemModel> mData) {
    this.mContext = mContext;
    this.mData = mData;
}



@NonNull
@Override
public MyViewHolder0 onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view;
    LayoutInflater mInflater = LayoutInflater.from(mContext);
    view = mInflater.inflate(R.layout.cardview_item_book, parent, false);
    return new MyViewHolder0(view);
}

@Override
public void onBindViewHolder(@NonNull MyViewHolder0 holder, final int position) {
    holder.tv_book_title.setText(mData.get(position).getWord());
    holder.img_book_thumbnail.setImageResource(mData.get(position).getImage());

        holder.cardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(mContext,Book_Activity.class);
                // passing data to the book activity

                //intent.putExtra("key_Word",value);
                intent.putExtra("Word",mData.get(position).getWord());
                intent.putExtra("Pronunciation",mData.get(position).getPronunciation());
                intent.putExtra("Examples&Explanation",mData.get(position).getExamples());
                //intent.putExtra("Definition",mData.get(position).getDefinition());
                intent.putExtra("WordImage",mData.get(position).getImage());
                // start the activity
                mContext.startActivity(intent);
            }
        });
    }

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

    public static class MyViewHolder0 extends RecyclerView.ViewHolder {
        TextView tv_book_title;
        ImageView img_book_thumbnail;
        CardView cardView ;

        public MyViewHolder0(View itemView) {
            super(itemView);
            tv_book_title =  itemView.findViewById(R.id.book_title_id) ;
            img_book_thumbnail = itemView.findViewById(R.id.book_img_id);
            cardView =  itemView.findViewById(R.id.cardview_id);
        }
    }



}

公共类RecycleServiceAdapter扩展了RecyclerView.Adapter{
私有上下文；
私有ArrayList mData；
//构造器
公共RecycleServiceAdapter（上下文mContext、ArrayList mData）{
this.mContext=mContext；
this.mData=mData；
}
@非空
@凌驾
public MyViewHolder0 onCreateViewHolder（@NonNull ViewGroup父级，int-viewType）{
视图；
LayoutInflater mInflater=LayoutInflater.from（mContext）；
view=mInflater.充气（R.layout.cardview\u item\u book，父项，false）；
返回新的MyViewHolder0（视图）；
}
@凌驾
BindViewHolder上的公共无效（@NonNull MyViewHolder0 holder，最终int位置）{
holder.tv\u book\u title.setText（mData.get（position.getWord（））；
holder.img_book_缩略图.setImageResource（mData.get（position.getImage（））；
holder.cardView.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
意向意向=新意向（mContext，Book_Activity.class）；
//将数据传递给book活动
//意图。putExtra（“关键字”，值）；
intent.putExtra（“Word”，mData.get（position.getWord（））；
intent.putExtra（“发音”，mData.get（position.get发音（））；
intent.putExtra（“示例和解释”，mData.get（position.getExamples（））；
//intent.putExtra（“定义”，mData.get（position.getDefinition（））；
intent.putExtra（“WordImage”，mData.get（position.getImage（））；
//开始活动
mContext.startActivity（意图）；
}
});
}
@凌驾
public int getItemCount（）{
返回mData.size（）；
}
公共静态类MyViewHolder0扩展了RecyclerView.ViewHolder{
TextView电视、书籍、书名；
ImageView img_book_缩略图；
卡德维尤；
公共MyViewHolder0（查看项目视图）{
超级（项目视图）；
tv\u book\u title=itemView.findviewbyd（R.id.book\u title\u id）；
img\u book\u缩略图=itemviewbyd（R.id.book\u img\u id）；
cardView=itemView.findViewById（R.id.cardView\U id）；
}
}
}

---

谁来帮帮我

您需要使用Intent将数据发送到另一个活动

@Override
  public void onClick(View v) {

    Book book = new Book(mBkTitle.getText().toString(),
            mBkAuthor.getText().toString());

    Intent intent = new Intent(MainActivity.this, BookActivity.class);
    intent.putExtra("Book", book);
    startActivity(intent);
  }

数据需要从Parcelable扩展

public class Book implements Parcelable {
  // book basics
  private String title;
  private String author;
}

用于帮助您将类包裹起来

检查本教程

---

我知道如何实现parcelable，但我有一个问题，那就是如何将数据的ArraySy传递给TabLayout Fragment！！

public class Book implements Parcelable {
  // book basics
  private String title;
  private String author;
}