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：
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package com.example.osserver.recycler;
import android.app.activity;
import android.os.bundle;
import android.support.v7.app.actionbaractivity;
import android.support.v7.widget.*;
import android.support.v7.widget.linearlayoutmanager;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.textview;
import java.util.arraylist;
import java.util.list;
public class mainactivity extends actionbaractivity {
private recyclerview mrecyclerview;
private list<string> mdatas;
private homeadapter madapter;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
initdata();
mrecyclerview = (recyclerview)findviewbyid(r.id.id_recyclerview);
mrecyclerview.setlayoutmanager(new linearlayoutmanager(this));
mrecyclerview.setadapter(madapter = new homeadapter());
mrecyclerview.additemdecoration(new divideritemdecoration(this,divideritemdecoration.horizontal_list));
}
private void initdata() {
mdatas = new arraylist<string>();
for (int i ='a';i<='z';i++){
mdatas.add(""+(char)i);
}
}
class homeadapter extends recyclerview.adapter<myviewholder>
{
@override
public myviewholder oncreateviewholder(viewgroup parent, int viewtype) {
myviewholder holder = new myviewholder(layoutinflater.from(mainactivity.this).inflate(r.layout.item,parent,false));
return holder;
}
@override
public void onbindviewholder(myviewholder holder, int position) {
holder.tv.settext(mdatas.get(position));
}
@override
public int getitemcount() {
return mdatas.size();
}
}
class myviewholder extends recyclerview.viewholder
{
textview tv;
public myviewholder(view view) {
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。
package com.zhy.sample.demo_recyclerview;
/*
* copyright (c) 2014 the android open source project
*
* licensed under the apache license, version 2.0 (the "license");
* 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.support.v7.widget.recyclerview.state;
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);
}
}
}
不能添加图片，那就写这些好了。
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