如何添加底页

Question

我正在尝试在底部的一张纸上显示一张带有卡片的回收站视图，用户可以向上滚动以显示所有的卡片，但是在实现此目的时遇到了问题。如何获得它，以便带卡片的“回收者视图”位于底页内？感谢您的帮助-我已经参加了好几天了，无法解决。有没有办法处理Android中显示的照片？附加的图像是我要复制的东西，但似乎找不到能做到这一点的东西：

MainActivity.kt

class MainActivity : AppCompatActivity() {

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

        if (supportActionBar != null)
            supportActionBar?.hide()

        val modelList = readFromAsset()

        val adapter = CustomAdapter(modelList, this)

        rcv.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false) as RecyclerView.LayoutManager?
        rcv.adapter = adapter;

        adapter.setOnItemClickListener(object : CustomAdapter.ClickListener {
            override fun onClick(pos: Int, aView: View) {
                Toast.makeText(this@MainActivity, modelList.get(pos).name, Toast.LENGTH_SHORT).show()
            }
        })
    }

    private fun readFromAsset(): List<Model> {

        val modeList = mutableListOf<Model>()
        val bufferReader = application.assets.open("android_version.json").bufferedReader()
        val json_string = bufferReader.use {
            it.readText()
        }

        val jsonArray = JSONArray(json_string);
        for (i in 0..jsonArray.length() - 1) {
            val jsonObject: JSONObject = jsonArray.getJSONObject(i)
            val model = Model(jsonObject.getString("name"), jsonObject.getString("version"))
            modeList.add(model)
        }
        return modeList
    }
}

activity_main

<?xml version="1.0" encoding="utf-8"?>
<androidx.recyclerview.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:id="@+id/rcv"/>

CustomAdapter.kt

class CustomAdapter(val modelList: List<Model>, val context: Context) :
    RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        (holder as ViewHolder).bind(modelList.get(position));
    }

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


    override fun getItemCount(): Int {
        return modelList.size;
    }

    lateinit var mClickListener: ClickListener

    fun setOnItemClickListener(aClickListener: ClickListener) {
        mClickListener = aClickListener
    }

    interface ClickListener {
        fun onClick(pos: Int, aView: View)
    }

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView), View.OnClickListener {

        init {
            itemView.setOnClickListener(this)
        }

        override fun onClick(p0: View?) {
            mClickListener.onClick(adapterPosition, itemView)
        }

        fun bind(model: Model): Unit {
            itemView.txt.text = model.name
            itemView.sub_txt.text = model.version

            val id = context.resources.getIdentifier(model.name.toLowerCase(), "drawable", context.packageName)
            itemView.img.setBackgroundResource(id)
        }

    }
}

row_item

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="75dp"
        android:layout_marginTop="10dp"
        android:clickable="true"
        android:focusable="true"
        android:foreground="?android:attr/selectableItemBackground"
        android:orientation="vertical"
        card_view:cardCornerRadius="30dp"
        card_view:cardElevation="5dp"
        card_view:cardUseCompatPadding="false"
        card_view:contentPadding="5dp">

    <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="16dp">

        <TextView
                android:id="@+id/txt"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="15dp"
                android:text="Title"
                android:textSize="20sp"
                android:textStyle="bold" />

        <ImageView
                android:id="@+id/img"
                android:layout_width="30dp"
                android:layout_height="match_parent"
                android:layout_marginStart="25dp"
                android:layout_toRightOf="@+id/txt"
                android:contentDescription="@string/app_name" />

        <TextView
                android:id="@+id/sub_txt"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginStart="25dp"
                android:layout_toRightOf="@+id/img"
                android:autoSizeMaxTextSize="8sp"
                android:autoSizeMinTextSize="6sp"
                android:autoSizeStepGranularity="2sp"
                android:autoSizeTextType="uniform"
                android:text="Title"/>
    </RelativeLayout>
</androidx.cardview.widget.CardView>

Answer 1

尝试在适配器类中使用用于显示底表的底表对话框或底表对话框片段