android基礎開發之RecycleView

recycleview是google為了優化listview，gridview 提供的乙個新的控制項。

dependencies 

@override
public recycleviewholder oncreateviewholder(viewgroup parent, int
viewtype) 
@override
public
void onbindviewholder(recycleviewholder holder, int
position) 
@override
public
intgetitemcount() 
class recycleviewholder extends
recyclerview.viewholder
}}

其次adapter要實現3個方法：

public recycleviewholder oncreateviewholder(viewgroup parent, int viewtype)　//viewholder 布局**

public void onbindviewholder(recycleviewholder holder, int position)　　資料處理**

public int getitemcount() 　　得到item size

layoutmanager:

recycleview 預設支援linearlayoutmanager & gridlayoutmanager

其實就是對應listview & gridview

mrcyv.setlayoutmanager(new linearlayoutmanager(this));

void

afterview()

本質上是每個itemview的子view。很多時候用途就是定義為 分隔線使用。

1.listview.

public

class recycleitemdecoration extends
recyclerview.itemdecoration ;
public
static
final
int horizontal_list =linearlayoutmanager.horizontal;
public
static
final
int vertical_list =linearlayoutmanager.vertical;
private
drawable mdivider;
private
intmorientation;
public recycleitemdecoration(context context, int
orientation) 
public
void setorientation(int
orientation) 
morientation =orientation;
}@override
public
void
ondraw(canvas c, recyclerview parent) 
else
}public
void
drawvertical(canvas c, recyclerview parent) 
}public
void
drawhorizontal(canvas c, recyclerview parent) 
}@override
public
void getitemoffsets(rect outrect, int
itemposition, recyclerview parent) 
else
}}

public

class recyclegriditemdecoration extends
recyclerview.itemdecoration ;
private
drawable mdivider;
public
recyclegriditemdecoration(context context)
@override
public
void
ondraw(canvas c, recyclerview parent, recyclerview.state state)
private
intgetspancount(recyclerview parent)
else
if (layoutmanager instanceof
staggeredgridlayoutmanager)
return
spancount;
}public
void
drawhorizontal(canvas c, recyclerview parent)
}public
void
drawvertical(canvas c, recyclerview parent)
}private
boolean islastcolum(recyclerview parent, int pos, int
spancount,
intchildcount)
} else
if (layoutmanager instanceof
staggeredgridlayoutmanager)
} else
}return
false
; }
private
boolean islastraw(recyclerview parent, int pos, int
spancount,
intchildcount)
else
if (layoutmanager instanceof
staggeredgridlayoutmanager)
else
//staggeredgridlayoutmanager 且橫向滾動}}
return
false
; }
@override
public
void getitemoffsets(rect outrect, int
itemposition,
recyclerview parent)
else
if (islastcolum(parent, itemposition, spancount, childcount))//
如果是最後一列，則不需要繪製右邊
else
}}

@eactivity(r.layout.activity_recycleview_demo)

public
class recycleviewdemo extends
activity
}

recycleview的每乙個item的add & delete都是可配置動畫的。defaultitemanimator是google提供的預設實現方式。

mrcyv.setitemanimator(new defaultitemanimator());

public

void adddata(int
position) 
public
void removedata(int
position)

recycleview比起listview來說，應該是可以定製更多的東西，尤其是瀑布模式，實現起來效果很炫。

參考：

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