Android RecyclerView详解及简单实例
Android RecyclerView
小白今天第一次接触RecyclerView，前辈大神告诉我这是一个很神奇的控件，一看就是一整天。
RecyclerView中有规定好的方法去显示列表，图片甚至视频。还带有删除新建某一列表的方法。相对于ListView这个
RecyclerView控件就更加牛了。
明白的大神看一眼就懂，小白可以自己照源码敲一遍看看效果。这段程序是把A-Z按列排列下来：
packagecom.example.osserver.recycler;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.support.v7.app.ActionBarActivity;
importandroid.support.v7.widget.*;
importandroid.support.v7.widget.LinearLayoutManager;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.TextView;
importjava.util.ArrayList;
importjava.util.List;
publicclassMainActivityextendsActionBarActivity{
privateRecyclerViewmRecyclerView;
privateList<String>mDatas;
privateHomeAdaptermAdapter;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
mRecyclerView=(RecyclerView)findViewById(R.id.id_recyclerview);
mRecyclerView.setLayoutManager(newLinearLayoutManager(this));
mRecyclerView.setAdapter(mAdapter=newHomeAdapter());
mRecyclerView.addItemDecoration(newDividerItemDecoration(this,DividerItemDecoration.HORIZONTAL_LIST));
}
privatevoidinitData(){
mDatas=newArrayList<String>();
for(inti='A';i<='Z';i++){
mDatas.add(""+(char)i);
}
}
classHomeAdapterextendsRecyclerView.Adapter<MyViewHolder>
{
@Override
publicMyViewHolderonCreateViewHolder(ViewGroupparent,intviewType){
MyViewHolderholder=newMyViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.item,parent,false));
returnholder;
}
@Override
publicvoidonBindViewHolder(MyViewHolderholder,intposition){
holder.tv.setText(mDatas.get(position));
}
@Override
publicintgetItemCount(){
returnmDatas.size();
}
}
classMyViewHolderextendsRecyclerView.ViewHolder
{
TextViewtv;
publicMyViewHolder(Viewview){
super(view);
tv=(TextView)view.findViewById(R.id.id_num);
}
}
}
接下来就是列表的润色部分：
今天我也只是进行到了这一步，踩了好多坑。
packagecom.zhy.sample.demo_recyclerview;
/*
*Copyright(C)2014TheAndroidOpenSourceProject
*
*LicensedundertheApacheLicense,Version2.0(the"License");
*limitationsundertheLicense.
*/
importandroid.content.Context;
importandroid.content.res.TypedArray;
importandroid.graphics.Canvas;
importandroid.graphics.Rect;
importandroid.graphics.drawable.Drawable;
importandroid.support.v7.widget.LinearLayoutManager;
importandroid.support.v7.widget.RecyclerView;
importandroid.support.v7.widget.RecyclerView.State;
importandroid.util.Log;
importandroid.view.View;
/**
*Thisclassisfromthev7samplesoftheAndroidSDK.It'snotbyme!
*<p/>
*Seethelicenseabovefordetails.
*/
publicclassDividerItemDecorationextendsRecyclerView.ItemDecoration{
privatestaticfinalint[]ATTRS=newint[]{
android.R.attr.listDivider
};
publicstaticfinalintHORIZONTAL_LIST=LinearLayoutManager.HORIZONTAL;
publicstaticfinalintVERTICAL_LIST=LinearLayoutManager.VERTICAL;
privateDrawablemDivider;
privateintmOrientation;
publicDividerItemDecoration(Contextcontext,intorientation){
finalTypedArraya=context.obtainStyledAttributes(ATTRS);
mDivider=a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
publicvoidsetOrientation(intorientation){
if(orientation!=HORIZONTAL_LIST&&orientation!=VERTICAL_LIST){
thrownewIllegalArgumentException("invalidorientation");
}
mOrientation=orientation;
}
@Override
publicvoidonDraw(Canvasc,RecyclerViewparent){
Log.v("recyclerview-itemdecoration","onDraw()");
if(mOrientation==VERTICAL_LIST){
drawVertical(c,parent);
}else{
drawHorizontal(c,parent);
}
}
publicvoiddrawVertical(Canvasc,RecyclerViewparent){
finalintleft=parent.getPaddingLeft();
finalintright=parent.getWidth()-parent.getPaddingRight();
finalintchildCount=parent.getChildCount();
for(inti=0;i<childCount;i++){
finalViewchild=parent.getChildAt(i);
android.support.v7.widget.RecyclerViewv=newandroid.support.v7.widget.RecyclerView(parent.getContext());
finalRecyclerView.LayoutParamsparams=(RecyclerView.LayoutParams)child
.getLayoutParams();
finalinttop=child.getBottom()+params.bottomMargin;
finalintbottom=top+mDivider.getIntrinsicHeight();
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
publicvoiddrawHorizontal(Canvasc,RecyclerViewparent){
finalinttop=parent.getPaddingTop();
finalintbottom=parent.getHeight()-parent.getPaddingBottom();
finalintchildCount=parent.getChildCount();
for(inti=0;i<childCount;i++){
finalViewchild=parent.getChildAt(i);
finalRecyclerView.LayoutParamsparams=(RecyclerView.LayoutParams)child
.getLayoutParams();
finalintleft=child.getRight()+params.rightMargin;
finalintright=left+mDivider.getIntrinsicHeight();
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
@Override
publicvoidgetItemOffsets(RectoutRect,intitemPosition,RecyclerViewparent){
if(mOrientation==VERTICAL_LIST){
outRect.set(0,0,0,mDivider.getIntrinsicHeight());
}else{
outRect.set(0,0,mDivider.getIntrinsicWidth(),0);
}
}
}
不能添加图片，那就写这些好了。
感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！