安卓recyclerview基本用法

效果图

主要代码

• 主界面:RecyclerViewActivity

class RecyclerViewActivity : AppCompatActivity() {
    private lateinit var adapter: RvAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_recycler_view)
        initRecyclerView()
        loadData()
    }

    private fun initRecyclerView() {
        adapter = RvAdapter()
        recyclerView.adapter = adapter
        //设置布局类型
        recyclerView.layoutManager = LinearLayoutManager(this)
        //如果要实现横向列表，就采用下面的布局方式
        //recyclerView.layoutManager = LinearLayoutManager(this, RecyclerView.HORIZONTAL, false)

        //添加安卓自带的分割线
        recyclerView.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))
    }

    private fun loadData() {
        val data = ArrayList<String>()
        for (i in 0..50) {
            data.add("text-$i")
        }
        adapter.setData(data)
    }
}

• 主界面布局文件:activity_recycler_view.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />
</LinearLayout>

• 列表adapter:RvAdapter

class RvAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
    private var mDataList = mutableListOf<String>()
    private lateinit var mContext: Context
    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val data = mDataList[position]
        holder.itemView.textView.text = data
        holder.itemView.setOnClickListener {
            setOnItemClickListener(data)
        }
    }

    fun setData(dataList: List<String>) {
        mDataList.clear()
        mDataList.addAll(dataList)
        notifyDataSetChanged()
    }

    override fun getItemCount(): Int = mDataList.size

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        mContext = parent.context
        val view = LayoutInflater.from(mContext).inflate(R.layout.item_rv, parent, false)
        return ViewHolder(view)
    }

    private fun setOnItemClickListener(data: String) {
        Toast.makeText(mContext, data, Toast.LENGTH_SHORT).show()
    }

    class ViewHolder(itemView: View?) : RecyclerView.ViewHolder(itemView!!)

}

• adapter布局文件:item_rv.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp"
        android:gravity="center"
        android:textSize="20sp"
        android:text="text" />

</LinearLayout>

源代码

https://gitee.com/cxyzy1/androidStart/tree/master/recyclerViewDemo