自定义流式布局控件

效果图:

原理图:

代码:

/**
 * Created by mChenys on 2015/12/5.
 * 2016/09/28 修改,对没有子控件的情况,避免MyFlowLayout填充父容器的情况
 */
public class MyFlowLayout extends ViewGroup {
    public static final int DEFAULT_SPACING = 20;
    //水平间距和垂直间距  
    private int mHorizontalSpacing = DEFAULT_SPACING, mVertivalSpacing = DEFAULT_SPACING;
    private Line mLine = null;  //当前行  
    private int mUsedWidth = 0;//当前行已使用的宽度  
    private int maxLine = 100; //最大行数  
    private List mLineList = new ArrayList<>();

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

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

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

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int left = getPaddingLeft();
        int top = getPaddingTop();
        int lines = mLineList.size();
        //确定行之间的垂直位置  
        for (int i = 0; i < lines; i++) {
            Line oneLine = mLineList.get(i);
            oneLine.layoutView(left, top);
            //更新每一行的top坐标  
            top += oneLine.mHeight + mVertivalSpacing;
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //子控件的最大宽高  
        int maxChildWidth = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
        int maxChildHeight = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
        //父控件的宽高模式  
        int parentWidthMode = MeasureSpec.getMode(widthMeasureSpec);
        int parentHeightMode = MeasureSpec.getMode(heightMeasureSpec);
        restoreLine();//每次进来onMeasure都需要重置一下数据  

        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View childView = getChildAt(i);
            if (childView.getVisibility() == View.GONE) {
                continue;
            }
            //确定子控件的宽高模式  
            int childWidthSpec = MeasureSpec.makeMeasureSpec(maxChildWidth,
                    parentWidthMode == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : parentWidthMode);
            int childHeightSpec = MeasureSpec.makeMeasureSpec(maxChildHeight,
                    parentHeightMode == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : parentHeightMode);
            //测量子控件  
            childView.measure(childWidthSpec, childHeightSpec);
            if (mLine == null) {
                mLine = new Line();
            }
            int width = childView.getMeasuredWidth();
            mUsedWidth += width;
            if (mUsedWidth <= maxChildWidth) {
                //当前使用的宽度没有超过最大子控件的宽度,那么可以添加到行中  
                mLine.addView(childView);
                mUsedWidth += mHorizontalSpacing;//加上水平间距  
                if (mUsedWidth >= maxChildWidth) {
                    //加上水平间距后大于了最大子控件宽度,那么需要换行  
                    if (!newLine()) {
                        break;
                    }
                }
            } else {
                //2种情况  
                //1.当前行没有控件,要添加的控件宽度大于最大宽度,强制添加,再换行  
                if (mLine.getViewCount() == 0) {
                    mLine.addView(childView);
                    if (!newLine()) {
                        break;
                    }
                } else {
                    //2.当前行剩余空间不够存放,需要先换行,再添加  
                    if (!newLine()) {
                        break;
                    }
                    mLine.addView(childView);
                    mUsedWidth += childView.getMeasuredWidth() + mHorizontalSpacing;//更新当前行使用的宽度  
                }
            }
        }
        //确保最后一行有剩余宽度的情况,也要把这一行添加到集合  
        if (null != mLine && mLine.getViewCount() > 0 && !mLineList.contains(mLine)) {
            mLineList.add(mLine);
        }
        //确定父控件宽高  
        int totalWidth = MeasureSpec.getSize(widthMeasureSpec);
        int totalHeight = 0;
        int lines = mLineList.size();
        for (int i = 0; i < lines; i++) {
            Line oneLine = mLineList.get(i);
            totalHeight += oneLine.mHeight;
        }
        if (lines > 0) {
            totalHeight += mVertivalSpacing * (lines - 1) + getPaddingTop() + getPaddingBottom();
            setMeasuredDimension(totalWidth, totalHeight);
        } else {
            //没有子控件时避免该控件填充父容器
            setMeasuredDimension(0, 0);
        }

    }

    /**
     * 创建新行
     *
     * @return
     */
    private boolean newLine() {
        //保存当前行  
        mLineList.add(mLine);
        if (mLineList.size() > maxLine) {
            return false;
        }
        //重置变量  
        mLine = new Line();
        mUsedWidth = 0;
        return true;
    }

    /**
     * 还原所有数据
     */
    private void restoreLine() {
        mLineList.clear();
        mLine = new Line();
        mUsedWidth = 0;
    }

    /**
     * 代表着一行，封装了一行所占高度，该行子View的集合，以及所有View的宽度总和
     */
    private class Line {
        private int mHeight;//行高  
        private int mWidth; //当前行子View的总宽度  
        private List childViews = new ArrayList<>();

        //添加子控件到行  
        public void addView(View view) {
            childViews.add(view);
            mHeight = mHeight > view.getMeasuredHeight() ? mHeight : view.getMeasuredHeight();
            mWidth += view.getMeasuredWidth();
        }

        //获取当前行的子控件个数  
        public int getViewCount() {
            return childViews.size();
        }

        public void layoutView(int left, int top) {
            //1.有剩余宽度的情况  
            int viewCount = getViewCount();
            int surplusWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() -
                    mWidth - mHorizontalSpacing * (viewCount - 1);
            if (surplusWidth >= 0) {
                //需要平均分配  
                int splitWidth = (int) (surplusWidth / viewCount + 0.5f);
                for (int i = 0; i < viewCount; i++) {
                    View childView = childViews.get(i);
                    int width = childView.getMeasuredWidth();
                    int height = childView.getMeasuredHeight();
                    //平分宽度的逻辑,如果不需要平分,可以注释掉
                    if (splitWidth > 0) {
                        width += splitWidth;
                        //重新测量控件  
                        int widthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
                        int heightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
                        childView.measure(widthSpec, heightSpec);
                    }
                    //高度低的要垂直居中显示  
                    int topOffset = (int) ((mHeight - height) / 2 + 0.5f);
                    if (topOffset < 0) {
                        topOffset = 0;
                    }
                    //更新top值  
                    top += topOffset;
                    //确定当前行子控件的位置  
                    childView.layout(left, top, left + width, top + height);
                    //更新下一子控件的left坐标  
                    left += width + mHorizontalSpacing;
                }
            } else {
                //2.超出子控件的最大宽度,强制添加后的位置确定  
                if (getViewCount() == 1) {
                    View childView = childViews.get(0);
                    childView.layout(left, top, left + childView.getMeasuredWidth(), top + childView.getMeasuredHeight());
                }
            }
        }
    }
}  

使用方式:

public class MainActivity extends AppCompatActivity {
    String content = "['QQ','视频','放开那三国','电子书','酒店','单机','小说','斗地主','优酷','网游'," +
            "'WIFI万能钥匙','播放器','捕鱼达人2','机票','游戏','熊出没之熊大快跑','美图秀秀','浏览器','" +
            "单机游戏','我的世界','电影电视','QQ空间','旅游','免费游戏','2048','刀塔传奇','壁纸','节奏大师'," +
            "'锁屏','装机必备','天天动听','备份','网盘','海淘网','大众点评','爱奇艺视频','腾讯手机管家','百度地图'," +
            "'猎豹清理大师','谷歌地图','hao123上网导航','京东','youni有你','万年历-农历黄历','支付宝钱包']";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ScrollView scrollView = new ScrollView(this);
        int padding = (int) (this.getResources().getDisplayMetrics().density * 10 + 0.5f);
        scrollView.setPadding(padding, padding, padding, padding);
        MyFlowLayout flowLayout = new MyFlowLayout(this);
        Random random = new Random();
        try {
            JSONArray jsonArray = new JSONArray(content);
            for (int i = 0; i < jsonArray.length(); i++) {
                final String str = jsonArray.optString(i);
                TextView textView = new TextView(this);
                textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);
                textView.setText(str);
                textView.setGravity(Gravity.CENTER);
                textView.setPadding(padding, padding, padding, padding);
                textView.setTextColor(Color.WHITE);
                //随机创建颜色值
                int r = 30 + random.nextInt(210);
                int g = 30 + random.nextInt(210);
                int b = 30 + random.nextInt(210);
                //按下后的偏白的背景色
                int pressColor = 0xffcecece;
                int defaultColor = Color.rgb(r, g, b);
                //创建圆角矩形背景选择器
                StateListDrawable selector = DrawableUtils.getStateList(defaultColor, pressColor, 5);
                textView.setBackgroundDrawable(selector);
                textView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
                    }
                });
                flowLayout.addView(textView);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        scrollView.addView(flowLayout);
        setContentView(scrollView);
    }
}