Android自动换行布局

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/***/
public class AutoWrapLayout extends ViewGroup {

　　//支持的最大行数 10行，可以根据需要调整
    private int[] mRawArray = new int[10];

    private int mPadding = 3;

    public AutoWrapLayout(Context context) {
        this(context, null);
    }

    public AutoWrapLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoWrapLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int width = getMeasuredWidth();
        int height = getMeasuredHeight();

        int childCount = getChildCount();

        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
        }

        int rawChildWidthSum = 0;
        int maxChildHeight = 0;

        for (int i = 0, raw = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                int childWidth = child.getMeasuredWidth();
                int childHeight = child.getMeasuredHeight();

                if (maxChildHeight < childHeight) maxChildHeight = childHeight;
                rawChildWidthSum += childWidth;

                mRawArray[raw] = i;
                if (rawChildWidthSum > width) {
                    mRawArray[raw]--;
                    raw++;
                    rawChildWidthSum = 0;
                }
                mRawArray[raw] = i;
            }
        }

        int allRawHeight = 0;

        for (int aRawArray : mRawArray) {
            if (aRawArray > 0) {
                allRawHeight += (maxChildHeight + mPadding * 3);
            } else {
　　　　　　　　break
　　　　　　　}
　　　　　}

        setMeasuredDimension(width, allRawHeight);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        int left = 0;
        int top = t;

        int maxChildHeight = 0;

        for (int i = 0; i < mRawArray.length; i++){//every raw
            //i <=> raw number
            int aRawArray = mRawArray[i];

            // Handle first raw particularly.
            if (i == 0) {
                if (aRawArray > 0) {
                    for (int j = 0; j <= aRawArray; j++) {// column
                        final View child = getChildAt(j);

                        int childWidth = child.getMeasuredWidth();
                        int childHeight = child.getMeasuredHeight();

                        left += childWidth;
                        top = 0;

                        if (maxChildHeight < childHeight) maxChildHeight = childHeight;

                        child.layout(left - childWidth, 2, left, top +  maxChildHeight + 3);
                    }
                }
                continue;
            }

            if (aRawArray > 0) {
                left = 0;
                for (int j = mRawArray[i - 1] + 1; j <= aRawArray; j++) {// column
                    final View child = getChildAt(j);

                    int childWidth = child.getMeasuredWidth();
                    int childHeight = child.getMeasuredHeight();

                    left += childWidth;
                    top = i * maxChildHeight + maxChildHeight + t;

                    if (maxChildHeight < childHeight) maxChildHeight = childHeight;

                    child.layout(left - childWidth, top - maxChildHeight + 2, left, top + 3);
                }
            } else {
                break;
            }
        }

    }
}