Android自动换行布局之AutoLinefeedLayout

直接上代码，

创建AutoLinefeedLayout.java

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

/**
 * 自动换行布局
 * @author zhao_pc
 */
public class AutoLinefeedLayout extends ViewGroup {public AutoLinefeedLayout(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);
   }public AutoLinefeedLayout(Context context, AttributeSet attrs) {this(context, attrs, 0);
   }public AutoLinefeedLayout(Context context) {this(context, null);
   }@Override
   protected void onLayout(boolean changed, int l, int t, int r, int b) {layoutHorizontal();
   }private void layoutHorizontal() {final int count = getChildCount();
      final int lineWidth = getMeasuredWidth() - getPaddingLeft()- getPaddingRight();
      int paddingTop = getPaddingTop();
      int childTop = 0;
      int childLeft = getPaddingLeft();

      int availableLineWidth = lineWidth;
      int maxLineHight = 0;

      for (int i = 0; i < count; i++) {final View child = getChildAt(i);
         if (child == null) {continue;
         } else if (child.getVisibility() != GONE) {final int childWidth = child.getMeasuredWidth();
            final int childHeight = child.getMeasuredHeight();

            if (availableLineWidth < childWidth) {availableLineWidth = lineWidth;
               paddingTop = paddingTop + maxLineHight;
               childLeft = getPaddingLeft();
               maxLineHight = 0;
            }childTop = paddingTop;
            setChildFrame(child, childLeft, childTop, childWidth,
                  childHeight);
            childLeft += childWidth;
            availableLineWidth = availableLineWidth - childWidth;
            maxLineHight = Math.max(maxLineHight, childHeight);
         }}}private void setChildFrame(View child, int left, int top, int width,
         int height) {child.layout(left, top, left + width, top + height);
   }@Override
   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
      int count = getChildCount();
      for (int i = 0; i < count; i++) {measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
      }if (heightMode == MeasureSpec.AT_MOST||heightMode == MeasureSpec.UNSPECIFIED) {final int width = MeasureSpec.getSize(widthMeasureSpec);
         super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(getDesiredHeight(width), MeasureSpec.EXACTLY));
      } else {super.onMeasure(widthMeasureSpec, heightMeasureSpec);
      }}private int getDesiredHeight(int width) {final int lineWidth = width - getPaddingLeft() - getPaddingRight();
      int availableLineWidth = lineWidth;
      int totalHeight = getPaddingTop() + getPaddingBottom();
      int lineHeight = 0;
      for (int i = 0; i < getChildCount(); i++) {View child = getChildAt(i);
         final int childWidth = child.getMeasuredWidth();
         final int childHeight = child.getMeasuredHeight();
         if (availableLineWidth < childWidth) {availableLineWidth = lineWidth;
            totalHeight = totalHeight + lineHeight;
            lineHeight = 0;
         }availableLineWidth = availableLineWidth - childWidth;
         lineHeight = Math.max(childHeight, lineHeight);
      }totalHeight = totalHeight + lineHeight;
      return totalHeight;
   }}

使用方法：

xml中使用

    android:id="@+id/linearlayout_post"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

java添加子布局

避免在listview中布局重复问题，addview之前需调用

autolinefeedlayout.removeAllViews();

LayoutInflater inflater = LayoutInflater.from(this);
LinearLayout ll = (LinearLayout) inflater.inflate(R.layout.xxx, null);

autolinefeedlayout.addView(ll);

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