自动换行LinearLayout

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自定义View-自动换行LinearLayout

备忘,加强记忆,没调试,只是为了熟悉

public class NextLineLinearLayout extends LinearLayout{    //记录距离父布局的位置    private int left,top,right,bottom;    //存放位置信息    private HashTable ht=new HashTable();    public NextLineLinearLayout (Context context) {        super(context);    }    public NextLineLinearLayout (Context context, int horizontalSpacing,             int verticalSpacing) {        super(context);    }    public NextLineLinearLayout (Context context, AttributeSet attrs) {        super(context, attrs);    }     @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int mWidth=MeasureSpec.getSize(widthMeasureSpec);        int mCount=getChildCount();        int mX=0;        int mY=0;        left=0;        //增加间距        top=5+0;        botton=0;        right=0;        //记录换行的位置        int j=0;        for(int i=0;i<mCount;i++){            View chaildView=getChildAt(i);            childView.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED);            int childeh=childeView.getMeasureHeight();            int childew=childeView.getMeasureWidth();            Position posititon=new Position();            mX+=childew;            left=getLeft(i-j,i);            if(mX>mWidth){                mX=childew;                mY+=(childeh+5);                left=0;                j=i;            }            top=mY;            right=left+childw;            bottoom=mY+childh;            position.top=top;            position.bottom=bottom;            position.left=left;            position.right=right;            ht.put(childeView,position);        }           setMeasuredDimension(mWidth, bottom);    }     @Override    protected LayoutParams generateDefaultLayoutParams() {        return new LayoutParams(0, 0);     }     @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int childCount=getChildCount();        for(int i=0;i<childCount;i++){             View child=getChildAt(i);             Position p=(Position)map.get(child);             if(p!=null){                child.layout(p.left,p.top,p.right,p.bottom);                  }        }        }    private Class Position{        int left,top,rignt,bottom;    }    private int getLeft(int row,int count){        if(row>0){            return getLeft(row-1,count-1)+getChildAt(count-1).getMeasureWidth+8;        } //到0,返回距离左边的填充        return getPaddingLeft();    }}
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