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RecyclerView的使用之多種Item加載布局

 更新時間:2016年03月09日 10:08:06   作者:李濟(jì)洲  
本文給大家介石介紹下如何利用RecyclerView實現(xiàn)多Item布局的加載,多Item布局的加載的意思就是在開發(fā)過程中List的每一項可能根據(jù)需求的不同會加載不同的Layout

本文給大家介石介紹下如何利用RecyclerView實現(xiàn)多Item布局的加載,多Item布局的加載的意思就是在開發(fā)過程中List的每一項可能根據(jù)需求的不同會加載不同的Layout。

下面給大家展示下演示效果圖:

 這里寫圖片描述

* 圖片資源版權(quán)歸屬于Facebook dribbble

RecyclerView實現(xiàn)加載不同的Layout的核心就是在Adapter的onCreateViewHolder里面去根據(jù)需求而加載不同的布局。

具體的實現(xiàn)步驟:(以Android Studio作為開發(fā)工具)

1:Gradle配置 build.gradle

這里cardview也是一種新的布局容器,上一篇有介紹。

compile 'com.android.support:recyclerview-v7:23.1.1'
compile 'com.android.support:cardview-v7:23.1.1'

2:建立列表的布局 activity_recyclerview.xml

<?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="match_parent">
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rv_list"
/>
</LinearLayout>

由于需要多種item Layout的加載,我們需要建立2個item布局

3:建立列表Item項的布局(1) item1.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:id="@+id/cv_item"
android:foreground="?android:attr/selectableItemBackground"
card_view:cardCornerRadius="4dp"
card_view:cardBackgroundColor="#ffffff"
card_view:cardElevation="4dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<ImageView
android:id="@+id/iv_item1_pic"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_weight="1"
android:background="@mipmap/lighthouse"
/>
<TextView
android:id="@+id/tv_item1_text"
android:padding="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v7.widget.CardView>

4:建立列表Item項的布局(2) item2.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:foreground="?android:attr/selectableItemBackground"
card_view:cardCornerRadius="4dp"
card_view:cardBackgroundColor="#E040FB"
card_view:cardElevation="4dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="@+id/tv_item2_text"
android:padding="20dp"
android:textColor="#ffffff"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v7.widget.CardView>

*最重要的部分 Adapter

5:建立RecyclerView的Adapter,RecyclerViewAdapter.java

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.TextView;
/**
* Created by Lijizhou on 2016/2/21.
*/
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private LayoutInflater mLayoutInflater;
private Context context;
private String [] titles;
//建立枚舉 2個item 類型
public enum ITEM_TYPE {
ITEM1,
ITEM2
}
public RecyclerViewAdapter(Context context,String[] titles){
this.titles = titles;
this.context = context;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//加載Item View的時候根據(jù)不同TYPE加載不同的布局
if (viewType == ITEM_TYPE.ITEM1.ordinal()) {
return new Item1ViewHolder(mLayoutInflater.inflate(R.layout.item1, parent, false));
} else {
return new Item2ViewHolder(mLayoutInflater.inflate(R.layout.item2, parent, false));
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof Item1ViewHolder) {
((Item1ViewHolder) holder).mTextView.setText(titles[position]);
} else if (holder instanceof Item2ViewHolder) {
((Item2ViewHolder) holder).mTextView.setText(titles[position]);
}
}
//設(shè)置ITEM類型,可以自由發(fā)揮,這里設(shè)置item position單數(shù)顯示item1 偶數(shù)顯示item2
@Override
public int getItemViewType(int position) {
//Enum類提供了一個ordinal()方法,返回枚舉類型的序數(shù),這里ITEM_TYPE.ITEM1.ordinal()代表0, ITEM_TYPE.ITEM2.ordinal()代表1
return position % 2 == 0 ? ITEM_TYPE.ITEM1.ordinal() : ITEM_TYPE.ITEM2.ordinal();
}
@Override
public int getItemCount() {
return titles == null ? 0 : titles.length;
}
//item1 的ViewHolder
public static class Item1ViewHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public Item1ViewHolder(View itemView) {
super(itemView);
mTextView=(TextView)itemView.findViewById(R.id.tv_item1_text);
}
}
//item2 的ViewHolder
public static class Item2ViewHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public Item2ViewHolder(View itemView) {
super(itemView);
mTextView=(TextView)itemView.findViewById(R.id.tv_item2_text);
}
}
}

OK,Adapter建立好了,那么最后一步就是在Activity里面進(jìn)行相關(guān)操作

6:列表頁面的類文件 RecyclerViewActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
/**
* Created by Lijizhou on 2016/2/21.
*/
public class RecyclerViewActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
//item 顯示所需(僅供DEMO)
private String[] title = {"Blog : http://blog.csdn.net/Leejizhou.",
"A good laugh and a long sleep are the best cures in the doctor's book.",
"all or nothing, now or never ",
"Be nice to people on the way up, because you'll need them on your way down.",
"Be confident with yourself and stop worrying what other people think. Do what's best for your future happiness!",
"Blessed is he whose fame does not outshine his truth.",
"Create good memories today, so that you can have a good past"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recyclerview);
mRecyclerView=(RecyclerView)findViewById(R.id.rv_list);
//這里根據(jù)上一個頁面的傳入值來加載LIST或GRID,上一個頁面僅僅2個按鈕,參考演示DEMO
if (getIntent().getIntExtra("type", 0) == 1){
//List
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(layoutManager);
}else if(getIntent().getIntExtra("type", 0) == 2){
//grid
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
}
//RecyclerView設(shè)置Adapter
mRecyclerView.setAdapter(new RecyclerViewAdapter(this, title));
}
}

Ok,這樣RecyclerView的多Item布局的加載就實現(xiàn),關(guān)于RecyclerView的使用之多種Item加載布局就給大家介紹這么多,希望對大家有所幫助!

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