Recycleview設計

在第一次類微信界面設計的基礎上，對第一個界面進行Recycleview設計，可以實作翻滾效果。

1.添加依賴

File —> Project Structure—>Dependencies—>點選app選中Declared Dependencies下的+号—>Library dependence—>搜尋recycleview

2.activity_main.xml中添加代碼

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <include layout="@layout/top" />
    <FrameLayout
        android:id="@+id/id_content"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
    </FrameLayout>
    <include layout="@layout/bottom" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
           

3.在res檔案中建立recycle.xml檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:layout_margin="8dp"
    android:background="@android:color/darker_gray"
    android:orientation="vertical">
    <TextView
        android:id="@+id/tv_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:text="1" />
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:text="内容" />
</LinearLayout>
           

4.建立擴充卡，并對控件初始化

package com.example.mywechat;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;

class VerticalAdapter extends RecyclerView.Adapter<VerticalAdapter.VerticalViewHolder> {
    private static final String TAG = VerticalAdapter.class.getSimpleName();

    private Context mContext;

    private List<String> mList = new ArrayList<>();

    public VerticalAdapter(Context context) {
        mContext = context;
    }

    public void setVerticalDataList(List<String> list) {
        Log.d(TAG, "setVerticalDataList: " + list.size());

        mList = list;
        notifyDataSetChanged();
    }
    @Override
    public VerticalViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.recycle, parent, false);
        return new VerticalViewHolder(view);
    }
    @Override
    public void onBindViewHolder(@NonNull VerticalViewHolder holder, int position) {
        holder.tvNum.setText(position + 1 + "");
        holder.tvContent.setText(mList.get(position));
    }
    @Override
    public int getItemCount() {
        return mList == null ? 0 : mList.size();
    }
    public class VerticalViewHolder extends RecyclerView.ViewHolder {
        TextView tvNum, tvContent;
        public VerticalViewHolder(View itemView) {
            super(itemView);
            tvNum = itemView.findViewById(R.id.tv_num);
            tvContent = itemView.findViewById(R.id.tv_content);
        }
    }
}
           

5.在第一個微信界面中添加recycleview布局所需的代碼

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rcv_vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:overScrollMode="never"
        android:scrollbars="none"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.007" />
</androidx.constraintlayout.widget.ConstraintLayout>
           

6.效果圖

源碼位址：

連結: https://github.com/GODFF556.