继承LinearLayout实现根据屏幕宽度及内部子View个数自动排布GridView

public class VerticalSearchGridView extends LinearLayout implements View.OnClickListener {

    private int mItemWidth;
    private int mItemHeight;

    public int mColumes;
    public int mRows;
    private final static int ITEM_MIN_HEIGH = DisplayManager.dipToPixel(75);
    private final static int ITEM_WIDTH = DisplayManager.dipToPixel(75);
    private final static int PADDING_LR= DisplayManager.dipToPixel(10);

    private List<SearchEngineInfo> mSearchEngineInfos;
    public VerticalSearchGridView(Context context) {

        super(context);
    }

    public VerticalSearchGridView(Context context, AttributeSet attrs) {

        super(context, attrs);
    }

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

        super(context, attrs, defStyle);
    }

    public void setData(List<SearchEngineInfo> searchEngineInfos){
        mSearchEngineInfos = searchEngineInfos;
        for (int i = 0; i < mSearchEngineInfos.size(); i++) {
          SearchEngineGridItem item = new SearchEngineGridItem();
          View childView = item.getView(i, this);
          childView.setOnClickListener(this);
          childView.setId(i);
          addView(childView);
      }
    }
    @Override
    public void onClick(View v) {

        int position = v.getId();
        mOnitemClickListener.onItemClick(null, v, position, position);
    }

    private OnItemClickListener mOnitemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.mOnitemClickListener=onItemClickListener;
    }

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

        int menuWidth = mItemWidth;
        int menuHeight = mItemHeight;
        for (int i = 0; i < mRows; i++) {
            for (int j = 0; j < mColumes; j++) {
                int index = i * mColumes + j;
                if (index < getChildCount()) {
                    View child = getChildAt(index);
                    int x = j * menuWidth;
                    int y = i * menuHeight;
                    child.layout(x + PADDING_LR, y, x + menuWidth + PADDING_LR, y + menuHeight);
                }
            }
        }
    }

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

        if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.AT_MOST) {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(widthMeasureSpec),
                    MeasureSpec.EXACTLY);
        }
        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(heightMeasureSpec),
                    MeasureSpec.EXACTLY);
        }
        int width = DisplayManager.screenWidthPixel(getContext()) - getResources().getDimensionPixelSize(R.dimen.search_engine_grid_margin_left)
                - getResources().getDimensionPixelSize(R.dimen.search_engine_grid_margin_right);
        int height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        measureChildren(MeasureSpec.makeMeasureSpec(ITEM_WIDTH, MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
        int maxHeight = ITEM_MIN_HEIGH;
        int maxWidth = 0;
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            maxWidth = Math.max(maxWidth, child.getMeasuredWidth());
            maxHeight = Math.max(maxHeight, child.getMeasuredHeight());
        }
        mItemWidth = maxWidth;
        mItemHeight = maxHeight;

        int totleCount = mSearchEngineInfos.size();
        width = width - PADDING_LR * 2;

        int oneLineCount = width / mItemWidth;
        if(totleCount < oneLineCount){
            mColumes = totleCount;
            mRows = 1;
        }else {// 一排放不下
            mItemWidth = width / oneLineCount; //平均放
            int adds = 0;
            if (totleCount % oneLineCount != 0) {
                adds = 1;
            }
            mColumes = oneLineCount;
            mRows = totleCount / oneLineCount + adds; // 计算行数
        }
        setMeasuredDimension(mItemWidth * mColumes + PADDING_LR * 2, mItemHeight * mRows);
    }

    private final static int ITEM_PADDING_LR = DisplayManager.dipToPixel(5);

    private class SearchEngineGridItem {

        public View getView(int position, ViewGroup parent) {

            View convertView = createView(parent);
            bindView(position, convertView);
            return convertView;
        }

        private View createView(ViewGroup parent) {

            View v = LayoutInflater.from(getContext()).inflate(R.layout.search_engine_item, parent,
                    false);
            return v;
        }

        private void bindView(int position, View view) {

            final ImageView engineImg = (ImageView) view.findViewById(R.id.engine_item_img);
            final TextView engineName = (TextView) view.findViewById(R.id.engine_item_text);

            ThemeManager tm = ThemeManager.getInstance();
            view.findViewById(R.id.engine_item).setBackgroundDrawable(
                    tm.getDrawable(R.drawable.search_engine_item_bg));
            SearchEngineInfo searchEngineInfo = mSearchEngineInfos.get(position);
            Drawable drawable = searchEngineInfo.getIconDrawable();
            tm.applyDrawableAlpha(drawable);
            engineImg.setBackgroundDrawable(drawable);
            engineName.setTextColor(tm.getColor(R.color.search_engine_choose_item_textcolor));
            engineName.setText(searchEngineInfo.getTitle());
            engineName.setPadding(ITEM_PADDING_LR, 0, ITEM_PADDING_LR, 0);
        }
    }

}