RecyclerView实现横向的GridView效果

最新推荐文章于 2024-09-23 17:05:17 发布

duxiaxing

最新推荐文章于 2024-09-23 17:05:17 发布

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分类专栏：移动开发文章标签：横向GridView recyclervi 图片横向滑动 android

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本文详细介绍了如何在Android应用中实现RecyclerView组件，包括添加依赖、布局配置、Adapter编写等关键步骤。

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要使用RecyclerView，首先要在build.gradle文件中添加依赖compile 'com.android.support:appcompat-v7:24.1.0'
效果图可以横向滑动
布局如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.dxx.recycleviewtestdemo.MainActivity">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_margin="20dp"/>
</RelativeLayout>

使用方法:

package com.dxx.recycleviewtestdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView rv = (RecyclerView) findViewById(R.id.rv);
        rv.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));//设置布局管理器
        rv.setAdapter(new MyRVAdapter(this));
    }
}

其Adapter要继承RecyclerView.Adapter,在Adapter中药先定义ViewHolder，并继承RecyclerView.ViewHolder;如：

public class ViewHolder extends RecyclerView.ViewHolder{
        public ViewHolder(View itemView) {
            super(itemView);
        }
        ImageView rv_item_image;
        TextView rv_item_tv;
    }

在onCreateViewHolder进行初始化操作，在onBindViewHolder中对各种事件进行处理,getItemCount返回的是 RecyclerView的长度，其布局与代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:gravity="center"
              android:layout_marginLeft="18dp"
              android:layout_marginBottom="5dp"
              android:orientation="vertical">

    <ImageView
        android:id="@+id/rv_item_image"
        android:layout_width="82dp"
        android:layout_height="82dp"
        android:scaleType="centerCrop"
        android:src="@drawable/shiqikuangsan"/>

    <TextView
        android:id="@+id/rv_item_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="9dp"
        android:textSize="15sp"/>
</LinearLayout>

package com.dxx.recycleviewtestdemo;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Created by duxiaxing on 2016/7/27.
 */
public class MyRVAdapter extends RecyclerView.Adapter<MyRVAdapter.ViewHolder> {
    private Context context;
    public MyRVAdapter(Context context){
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_rv_item,parent,false);
        ViewHolder holder = new ViewHolder(view);
        holder.rv_item_image = (ImageView) view.findViewById(R.id.rv_item_image);
        holder.rv_item_tv = (TextView) view.findViewById(R.id.rv_item_tv);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.rv_item_tv.setText(position + "");
    }

    @Override
    public int getItemCount() {
        return 9;
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
        public ViewHolder(View itemView) {
            super(itemView);
        }
        ImageView rv_item_image;
        TextView rv_item_tv;
    }
}