RecyclerView的ListView显示效果

RecyclerView只关注回收和复用View

而不在乎item的显示位置，和动画，分割线。

总的来说它也是需要一个adapter来进行数据和视图的绑定。这个adapter是强制使用ViewHolder模式。

package com.example.recycleview;

import java.util.ArrayList;
import java.util.List;

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

public class MainActivity extends ActionBarActivity {
private RecyclerView recycler;
private List<String> mData;
// 自定义适配器
private SimpAdapter mAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initView();

}

private void initView() {
recycler = (RecyclerView) findViewById(R.id.recyclerView);

mAdapter = new SimpAdapter(mData, this);
recycler.setAdapter(mAdapter);
// 设置排列方式
LinearLayoutManager manager = new LinearLayoutManager(this,
LinearLayoutManager.VERTICAL, false);
recycler.setLayoutManager(manager);
// 设置分割线
recycler.addItemDecoration(new DividerItemDecoration(this,
DividerItemDecoration.VERTICAL_LIST));
}

private void initData() {
mData = new ArrayList<String>();
for (char i = 'A'; i < 'z'; i++) {
mData.add(String.valueOf(i));
}

}
}

适配器

package com.example.recycleview;

import java.util.List;

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

public class SimpAdapter extends RecyclerView.Adapter<MyViewHolder> {
// 数据
private List<String> list;
// 上下文
private Context context;

public SimpAdapter(List<String> list, Context context) {
this.list = list;
this.context = context;
}

@Override
public int getItemCount() {
// TODO Auto-generated method stub
return list.size();
}

// 绑定holder，进行设置
@Override
public void onBindViewHolder(MyViewHolder holder, int pos) {
holder.tv.setText(list.get(pos));

}

// 创建holder
@Override
public MyViewHolder onCreateViewHolder(ViewGroup arg0, int arg1) {
// 引用布局
View view = View.inflate(context, R.layout.item_text, null);
MyViewHolder holder = new MyViewHolder(view);
return holder;
}

}

class MyViewHolder extends ViewHolder {
TextView tv;

// 在构造方法里初始化
public MyViewHolder(View view) {
super(view);
tv = (TextView) view.findViewById(R.id.tv_show);
}

}

要设置分割线的话需要一个继承RecyclerView.ItemDecoration的类。

package com.example.recycleview;

/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;

/**
* This class is from the v7 samples of the Android SDK. It's not by me!
* <p/>
* See the license above for details.
*/
public class DividerItemDecoration extends RecyclerView.ItemDecoration
{

private static final int[] ATTRS = new int[] { android.R.attr.listDivider };

public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

private Drawable mDivider;

private int mOrientation;

public DividerItemDecoration(Context context, int orientation)
{
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}

public void setOrientation(int orientation)
{
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST)
{
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}

@Override
public void onDraw(Canvas c, RecyclerView parent)
{
Log.v("recyclerview - itemdecoration", "onDraw()");
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}

public void drawVertical(Canvas c, RecyclerView parent)
{
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();

final int childCount = parent.getChildCount();

for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(
parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}

public void drawHorizontal(Canvas c, RecyclerView parent)
{
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();

final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}

@Override
public void getItemOffsets(Rect outRect, int itemPosition,
RecyclerView parent)
{
if (mOrientation == VERTICAL_LIST)
{
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
}

布局文件

<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.example.recycleview.MainActivity" >

<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v7.widget.RecyclerView>

</RelativeLayout>

<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="100dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:background="#1000">

<TextView
android:id="@+id/tv_show"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"
android:gravity="center" />

</RelativeLayout>