流式布局测量

Author: LRH1993

app/src/main/java/com/example/lvruheng/autoflowlayout/AutoFlowLayout.java

@@ -70,6 +70,26 @@ public class AutoFlowLayout <T> extends LinearLayout {
  * 数据适配器
  */
  private FlowAdapter<T> mAdapter;
+ /**
+ * 水平方向View之间的间距
+ */
+ private int mHorizontalSpace;
+ /**
+ * 竖直方向View之间的间距
+ */
+ private int mVerticalSpace;
+ /**
+ * 列数
+ */
+ private int mColumnNumbers;
+ /**
+ * 行数
+ */
+ private int mRowNumbers;
+ /**
+ * 是否设置了网格布局
+ */
+ private boolean mIsGridMode;
 
  public AutoFlowLayout(Context context) {
  super(context);
@@ -89,22 +109,100 @@ private void init(Context context, AttributeSet attrs) {
  mIsSingleLine = ta.getBoolean(R.styleable.AutoFlowLayout_singleLine,false);
  mMaxLineNumbers = ta.getInteger(R.styleable.AutoFlowLayout_maxLines,Integer.MAX_VALUE);
  mIsMultiChecked = ta.getBoolean(R.styleable.AutoFlowLayout_multiChecked,false);
+ mHorizontalSpace = ta.getInteger(R.styleable.AutoFlowLayout_horizontalSpace,0);
+ mVerticalSpace = ta.getInteger(R.styleable.AutoFlowLayout_verticalSpace,0);
+ mColumnNumbers = ta.getInteger(R.styleable.AutoFlowLayout_columnNumbers,0);
+ mRowNumbers = ta.getInteger(R.styleable.AutoFlowLayout_rowNumbers,0);
+ if (mColumnNumbers != 0) {
+ mIsGridMode = true;
+ }
  ta.recycle();
  setOrientation(HORIZONTAL);
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
- setFlowMesure(widthMeasureSpec,heightMeasureSpec);
+ if (mIsGridMode) {
+ setGridMeasure(widthMeasureSpec,heightMeasureSpec);
+ } else {
+ setFlowMeasure(widthMeasureSpec,heightMeasureSpec);
+ }
+
+
+ }
 
+ /**
+ * 网格布局的测量模式 默认各个子VIEW宽高值相同
+ * @param widthMeasureSpec
+ * @param heightMeasureSpec
+ */
+ private void setGridMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ // 获得它的父容器为它设置的测量模式和大小
+ int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
+ int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
+ int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
+ int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
+ //获取viewgroup的padding
+ int paddingLeft = getPaddingLeft();
+ int paddingRight = getPaddingRight();
+ int paddingTop = getPaddingTop();
+ int paddingBottom = getPaddingBottom();
+ //超宽/超高纪录的最后值
+ int lastHeight;
+ int lastWidth;
+ //最终的宽高值
+ int heightResult;
+ int widthResult;
+ //未设置行数 推测行数
+ if (mRowNumbers == 0) {
+ mRowNumbers = getChildCount()/mColumnNumbers == 0 ?
+ getChildCount()/mColumnNumbers : (getChildCount()/mColumnNumbers + 1);
+ }
+ int maxChildHeight = 0;
+ int maxWidth = 0;
+ int maxHeight = 0;
+ //统计最大高度/最大宽度
+ for (int i = 0; i < mRowNumbers; i++) {
+ for (int j = 0; j < mColumnNumbers; j++) {
+ final View child = getChildAt(i * mColumnNumbers + j);
+ if (child != null) {
+ if (child.getVisibility() != GONE) {
+ final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+ final int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 0, lp.width);
+ final int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, 0, lp.height);
+ child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
+ maxWidth +=child.getMeasuredWidth();
+ maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight());
+ }
+ }
+ }
+ maxHeight += maxChildHeight;
+ maxChildHeight = 0;
+ }
+ int tempWidth = maxWidth+mHorizontalSpace*(mColumnNumbers-1)+paddingLeft+paddingRight;
+ int tempHeight = maxHeight+mVerticalSpace*(mRowNumbers-1)+paddingBottom+paddingTop;
+ if (tempWidth > sizeWidth) {
+ widthResult = sizeWidth;
+ } else {
+ widthResult = tempWidth;
+ }
+ //宽高超过屏幕大小，则进行压缩存放
+ if (tempHeight > sizeHeight) {
+ heightResult = sizeHeight;
+ } else {
+ heightResult = tempHeight;
+ }
+ setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth
+ : widthResult, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight
+ : heightResult);
  }
 
  /**
  * 流式布局的测量模式
  * @param widthMeasureSpec
  * @param heightMeasureSpec
  */
- private void setFlowMesure(int widthMeasureSpec, int heightMeasureSpec) {
+ private void setFlowMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  // 获得它的父容器为它设置的测量模式和大小
  int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
  int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
@@ -178,7 +276,18 @@ private void setFlowMesure(int widthMeasureSpec, int heightMeasureSpec) {
 
  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
- setFlowLayout();
+ if (mIsGridMode) {
+ setGridLayout();
+ } else {
+ setFlowLayout();
+ }
+ }
+
+ /**
+ * 网格布局的布局模式
+ */
+ private void setGridLayout() {
+
  }
 
  /**
@@ -474,6 +583,72 @@ public void setAdapter(FlowAdapter<T> adapter) {
  }
  }
 
+ /**
+ * 设置网格布局的水平间距
+ * @param horizontalSpace 单位px
+ */
+ public void setHorizontalSpace(int horizontalSpace) {
+ mHorizontalSpace = horizontalSpace;
+ requestLayout();
+ }
+
+ /**
+ * 返回网格布局的水平距离
+ * @return
+ */
+ public int getHorizontalSpace() {
+ return mHorizontalSpace;
+ }
+
+ /**
+ * 设置网格布局的垂直间距
+ * @param verticalSpace 单位px
+ */
+ public void setVerticalSpace(int verticalSpace) {
+ mVerticalSpace = verticalSpace;
+ requestLayout();
+ }
+
+ /**
+ * 返回网格布局的垂直距离
+ */
+ public int getVerticalSpace() {
+ return mVerticalSpace;
+ }
+
+ /**
+ * 设置列数
+ * @param columnNumbers
+ */
+ public void setColumnNumbers(int columnNumbers) {
+ mColumnNumbers = columnNumbers;
+ }
+
+ /**
+ * 获得列数
+ * @return
+ */
+ public int getColumnNumbers() {
+ return mColumnNumbers;
+ }
+
+ /**
+ * 设置行数
+ * @param rowNumbers
+ */
+ public void setRowNumbers(int rowNumbers) {
+ mRowNumbers = rowNumbers;
+ }
+
+ /**
+ * 得到行数
+ * @return
+ */
+ public int getRowNumbers() {
+ return mRowNumbers;
+ }
+
+
  public interface OnItemClickListener{
  void onItemClick(int position,View view);
  }