android 九宫格（16宫格）控件

public class NineRectView extends ViewGroup {

private Context ctx;

private int wSize,hSize,row,column,count,childWidth,childHeight,parent_padding_top_bottom;//布局方式按照默认wSize＝Hsize

//间距都相同

private int childMargin =4;

private int parent_padding;

private int first_row_num;

private int childCorner=2;

private String childAvatarUrlAppend;

private int childDefaultImageId = R.drawable.tt_default_user_portrait_corner;

public void setChildCorner(int corner)

{

this.childCorner = corner;

}

public void setAvatarUrlAppend(String avatarUrlAppend)

{

this.childAvatarUrlAppend = avatarUrlAppend;

}

public void setChildDefaultImageId(int id)

{

this.childDefaultImageId = id;

}

public void setChildMargin(int margin)

{

this.childMargin = margin;

}

public NineRectView(Context context) {

super(context);

this.ctx = context;

}

public NineRectView(Context context, AttributeSet attrs) {

super(context, attrs);

this.ctx = context;

}

public NineRectView(Context context, AttributeSet attrs,int defStyle) {

super(context, attrs,defStyle);

this.ctx = context;

}

public void setAvatarUrls(List<String> urlList)

{

count = urlList.size();

double m = Math.sqrt(count);

int k = (int)m;

if(m-k==0)

{

column = k;

first_row_num = column;

}

else

{

column = k+1;

}

if(count%column==0)

{

row = count/column;

first_row_num = column;

}

else

{

row = count/column+1;

first_row_num = count%column;

}

this.removeAllViews();

for (int i=0;i<count;i++)

{

IMBaseImageView imageView=new IMBaseImageView(ctx);

imageView.setCorner(childCorner);

imageView.setDefaultImageRes(childDefaultImageId);

imageView.setAvatarAppend(childAvatarUrlAppend);

imageView.setImageUrl(urlList.get(i));

this.addView(imageView);

}

}

@Override

protected void onLayout(boolean changed, int left, int top, int right, int bottom) {

if(row*column>=count)

{

parent_padding=getPaddingLeft();

this.wSize = getWidth();

this.hSize = getHeight();

computePoint();

if(count==1)//为1的特殊处理

{

int cw=(wSize-parent_padding*2-childMargin)/2;

int ch = (hSize-parent_padding*2-childMargin)/2;

int x = (wSize-cw)/2;

int y = (wSize-ch)/2;

View child = getChildAt(0);

child.layout(x, y, x+cw, y+ch);

}

else

{

for (int i = 0; i < count; i++) {

View child = getChildAt(i);

child.layout(startCoordinates.get(i).x, startCoordinates.get(i).y, startCoordinates.get(i).x+childWidth, startCoordinates.get(i).y+childHeight);

}

}

}

}

/**

* 计算坐标

*/

private void  computePoint()

{

startCoordinates.clear();

childWidth = (wSize- parent_padding*2-(column-1)* childMargin)/column;

childHeight = childWidth;//正方形

parent_padding_top_bottom = (hSize - row*childHeight - (row-1)*childMargin)/2;

//计算整排 按照从下向上的顺序计算

for (int i=0;i<row;i++)

{

for (int j=0;j<column;j++)

{

int x,y;

y = parent_padding_top_bottom+i*childHeight+i*childMargin;

if(i==0)

{

if(j<first_row_num)

{

x = (wSize-first_row_num*childWidth-(first_row_num-1)*childMargin)/2+j*childMargin+j*childWidth;

}

else

{

break;

}

}

else

{

x = parent_padding+j*childWidth+j*childMargin;

}

startCoordinates.add(new StartCoordinate(x,y));

}

}

}

private ArrayList<StartCoordinate> startCoordinates = new ArrayList<StartCoordinate>();

class StartCoordinate {

int x ,y;

public StartCoordinate(int x, int y){

this.x = x;

this.y = y;

}

}

}