Android(安卓)FlowLayout

https://github.com/ApmeM/android-flowlayout 使用这个类库。
import android.content.Context;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;/** * * @author RAW */public class FlowLayout extends ViewGroup {    private final static int PAD_H = 2, PAD_V = 2; // Space between child views.    private int mHeight;    public FlowLayout(Context context) {        super(context);    }    public FlowLayout(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);        final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();        int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();        final int count = getChildCount();        int xpos = getPaddingLeft();        int ypos = getPaddingTop();        int childHeightMeasureSpec;        if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST)            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);        else            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);        mHeight = 0;        for(int i = 0; i < count; i++) {            final View child = getChildAt(i);            if(child.getVisibility() != GONE) {                child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), childHeightMeasureSpec);                final int childw = child.getMeasuredWidth();                mHeight = Math.max(mHeight, child.getMeasuredHeight() + PAD_V);                if(xpos + childw > width) {                    xpos = getPaddingLeft();                    ypos += mHeight;                }                xpos += childw + PAD_H;            }        }        if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {            height = ypos + mHeight;        } else if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {            if(ypos + mHeight < height) {                height = ypos + mHeight;            }        }        height += 5; // Fudge to avoid clipping bottom of last row.        setMeasuredDimension(width, height);    } // end onMeasure()    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        final int width = r - l;        int xpos = getPaddingLeft();        int ypos = getPaddingTop();        for(int i = 0; i < getChildCount(); i++) {            final View child = getChildAt(i);            if(child.getVisibility() != GONE) {                final int childw = child.getMeasuredWidth();                final int childh = child.getMeasuredHeight();                if(xpos + childw > width) {                    xpos = getPaddingLeft();                    ypos += mHeight;                }                child.layout(xpos, ypos, xpos + childw, ypos + childh);                xpos += childw + PAD_H;            }        }    } // end onLayout()}
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