如何将数据从 RecyclerView (ProductActivity) 传递到 DetailActivity？

Question

在这个项目中，我必须制作一个 RecyclerView 来获取 Firebase 数据。 当有人单击 RecyclerView 中的任何特定项目时，我想使用从 Firebase 获取的相同数据打开 DetailActivity。 我知道这很容易，可以使用 intent.putExtra 来完成，但我是 Kotlin 的新手。 请帮我解决问题。

下面我附上我的ProductActivity.kt代码。

class ProductActivity() : AppCompatActivity(), ProductAdapter.OnItemClickListener
{
private var adapter: ProductAdapter? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_product)

    val query = FirebaseDatabase.getInstance().reference.child("products")
    val options = FirebaseRecyclerOptions.Builder<Product>().setQuery(query, 
    Product::class.java).build()
    adapter = ProductAdapter(options, this)
    val rView : RecyclerView = findViewById(R.id.rView)
    rView.layoutManager = LinearLayoutManager(this)
    rView.adapter = adapter
}

override fun onStart() {
    super.onStart()
    adapter?.startListening()
}

override fun onItemClick(position: Int) {
    Toast.makeText(this, "Item $position clicked", Toast.LENGTH_SHORT).show()
    val intent = Intent(this, DetailActivity::class.java)
    startActivity(intent)
 }
}

ProductAdapter.kt的代码

class ProductAdapter(options: FirebaseRecyclerOptions<Product>, private val listener: OnItemClickListener)
: FirebaseRecyclerAdapter<Product, ProductAdapter.MyViewHolder>(options) {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
    val inflater = LayoutInflater.from(parent.context)
    return MyViewHolder(inflater, parent)
}

override fun onBindViewHolder(holder: MyViewHolder, position: Int, model: Product) {

    val storRef: StorageReference =
        FirebaseStorage.getInstance().getReferenceFromUrl(model.photo)
    Glide.with(holder.imgPhoto.context).load(storRef).into(holder.imgPhoto)
    holder.txtName.text = model.name
    holder.txtPrice.text = model.price
    holder.txtDescription.text = model.description
}

inner class MyViewHolder(inflater: LayoutInflater, parent: ViewGroup) :
    RecyclerView.ViewHolder(inflater.inflate(R.layout.row_layout, parent, false)), View.OnClickListener {
    val txtName: TextView = itemView.findViewById(R.id.productName)
    val txtPrice: TextView = itemView.findViewById(R.id.productPrice)
    val txtDescription: TextView = itemView.findViewById(R.id.productDescription)
    val imgPhoto: ImageView = itemView.findViewById(R.id.productImage)

    init {
        itemView.setOnClickListener(this)
    }

    override fun onClick(p0: View?) {
        val position: Int = adapterPosition
        if (position != RecyclerView.NO_POSITION) {
            listener.onItemClick(position)
        }
    }
}

interface OnItemClickListener {
    fun onItemClick(position: Int)
  }
}

我要在其中传递数据的活动DetailActivity.kt

class DetailActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_detail)

  }
}

Answer 1

假设你想发送姓名、地址和电话号码来详细说明你的活动，在 Java 中你会在 itemclick 监听器中这样做

//从模型类中获取值

  intent.putExtra("name", model.get(position).getName);
    intent.putExtra("address", model.get(position).getAddress);
    intent.putExtra("phone", model.get(position).getPhone);

然后在 DetailsActivity 上获取意图并在各自的视图中设置值。

Answer 2

发送活动

Intent intent = new Intent(SendingActivity.this, RecievingActivity.class);
intent.putExtra("keyName", value);  // pass your values and retrieve them in the other Activity using keyName
startActivity(intent);

接收活动

Bundle extras = intent.getExtras();
    if(extras != null)
    String data = extras.getString("keyName"); // retrieve the data using keyName 

在您的项目中，“SendingActivity”必须替换为“ProductActivity”，“ReceivingActivity”必须替换为“DetailActivity”。