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Vdovin Daniil
Asked:2020-05-01 00:00:32 +0000 UTC2020-05-01 00:00:32 +0000 UTC

如何从 RecyclerView 中的按钮导航到新 Activity，并传递项目的位置

  • 772

我感兴趣的问题是如何让按钮了解它属于哪个 Itemy，并在向服务器发送请求的同时转到 Activity 以在此处加载此 Activity 上的数据

包 com.maikmarelostydios.a240417gid；

导入 android.content.Intent；导入 android.support.v7.widget.RecyclerView；导入 android.view.LayoutInflater；导入 android.view.View；导入 android.view.ViewGroup；导入 android.widget.Button；导入 android.widget.TextView；导入 android.widget.Toast；

导入java.util.List；

公共类 HotelAdapter 扩展了 RecyclerView.Adapter{

private List<Hotel> list;

public HotelAdapter(List<Hotel> list) {
    this.list = list;
}

@Override
public UserViewHotel onCreateViewHolder(ViewGroup parent, int viewType) {
    return new UserViewHotel(LayoutInflater.from(parent.getContext()).inflate(R.layout.view_hotel , parent, false));
}



@Override
public void onBindViewHolder(UserViewHotel holder, final int position) {
  Hotel hotel = list.get(position);

    holder.TvName.setText(hotel.name);
    holder.TvStar.setText("star:"+hotel.star + "");



    holder.btPodrob.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(view.getContext(),HotelViewActivity.class);
            intent.putExtra(HotelViewActivity.EXTRA_POS, position);
            view.getContext().startActivity(intent);

            Toast.makeText(view.getContext(),"Loading", Toast.LENGTH_SHORT).show();
        }
    });
}




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




class UserViewHotel extends RecyclerView.ViewHolder{

    TextView TvName, TvStar;
    Button btPodrob;



    public UserViewHotel(View itemView) {
        super(itemView);
        TvName = (TextView) itemView.findViewById(R.id.TvName);
        TvStar = (TextView) itemView.findViewById(R.id.TvStar);
        btPodrob = (Button) itemView.findViewById(R.id.btPodrob);

    }
}

}

recyclerview

1 个回答

  1. Best Answer

    删除代码：

    holder.btPodrob.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(view.getContext(),HotelViewActivity.class);
        intent.putExtra(HotelViewActivity.EXTRA_POS, position);
        view.getContext().startActivity(intent);

        Toast.makeText(view.getContext(),"Loading", Toast.LENGTH_SHORT).show();
    }
});

    然后ViewHolder写intent_putExtra

    @Override
public void onBindViewHolder(UserViewHotel holder, final int position) {
  Hotel hotel = list.get(position);

holder.TvName.setText(hotel.name);
holder.TvStar.setText("star:"+hotel.star + "");

 holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(view.getContext(), HotelViewActivity.class);
            intent.putExtra(HotelViewActivity.EXTRA_POS, position);
            view.getContext().startActivity(intent);
        }
    });

    然后在activity其中intent添加一个静态变量

    static final String EXTRA_POS = "my_item_position";

    并在方法中onCreate 

    int my_item_position = (Int) getIntent().getExtras().get(EXTRA_POS);

    如果您将从数据库接收数据，请执行以下操作：

    try {
        SQLiteOpenHelper databaseHelper = new YourSQLiteOpenHelper(MainActivity.this);
        SQLiteDatabase db = databaseHelper.getReadableDatabase();
        Cursor cursor = db.query(
                "TABLE", new String[]{"ITEMS"},
                "_id = ?",
                new String[]{Integer.toString(my_item_position )},
                null, null, null);

        if (cursor.moveToFirst()) {

            ITEMS = cursor.getString(0);

        }

        cursor.close();
        db.close();

    } catch (SQLiteException e) {
        Toast.makeText(HeadsActivity.this, "База данных недоступна", Toast.LENGTH_SHORT).show();
    }

    按行 

    new String[]{Integer.toString(my_item_position )} БД будет знать какие данные передавать в `activity` в соответствии с нажатым пунктом.
    • 0

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