android根据子view里面的数量自动排版的一个ViewGroup

public class MyViewGroup extends ViewGroup {

	
	public MyViewGroup(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public MyViewGroup(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public MyViewGroup(Context context) {
		super(context);
	}
	
	public void setMyViewGroupInterface(MyViewGroupInterface face)
	{
		this.face = face;
	}
	
	private int count;		//改变前的 子View数量
	private boolean isAdd; //判断 是添加还是删除
	private MyViewGroupInterface face;

	/**
	 * 计算 各个子View的位置
	 */
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
//		 if (!changed)
//			 return;
		int i = getChildCount();
		if(count == i)
			return;
		isAdd = true;
		if(count > i)		//改变前的子view数量 大于 当前的数量 表示 删除
			isAdd = false;
		count = i;
		int width = getMeasuredWidth();

		int childWidth = 0;
		int childHeight = 0;

		int totalWidth = leftSpacing + rightSpacing;
		int currentTopPosition = topSpacing;
		int currentLeftPosition = leftSpacing;
		
		int maxHeight = 0;
		for (int j = 0; j < i; j++) {
			View v = getChildAt(j);
			childWidth = v.getMeasuredWidth();
			childHeight = v.getMeasuredHeight();
			if (j == 0) {
				totalWidth += childWidth;
				maxHeight = childHeight;
			} else {
				totalWidth += (childWidth + left_Right_Spacing);
				if (totalWidth > width) {
					currentTopPosition += (maxHeight + top_Bottom_Spacing);
					currentLeftPosition = leftSpacing;
					maxHeight = childHeight;
					totalWidth = leftSpacing + rightSpacing + childWidth;
				} else {
					if (childHeight > maxHeight) {
						maxHeight = childHeight;
					}
					View upChild = getChildAt(j-1);
					int upChildWidth = upChild.getMeasuredWidth();
					currentLeftPosition += (upChildWidth + left_Right_Spacing);
				}
			}
			l = currentLeftPosition;
			t = currentTopPosition;
			r = childWidth + currentLeftPosition;
			b = currentTopPosition + childHeight;
			v.layout(l, t, r, b);
		}
		if(i == 0){
			if(face != null)
				face.setScrollViewHeight(0,isAdd);
		}else{
			if(face != null)
				face.setScrollViewHeight(scrollViewHeight,isAdd);
		}
		
	}

	private final int leftSpacing = 10; // 子View离父容器左边的距离
	private final int rightSpacing = 10;// 子View离父容器右边的距离
	private final int topSpacing = 8;// 子View离父容器上边的距离
	private final int bottomSpacing = 8;// 子View离父容器底边的距离
	private final int left_Right_Spacing = 10;// 两个子View左右之间的间隔
	private final int top_Bottom_Spacing = 10;// 两个子View上下之间的间隔
	private final int umberRows = 3;//父容器中能够窜下子View的最大行数
	private int groupHeight;
	private int scrollViewHeight;
	private int height,width;
	
	
	/**
	 * 计算 父容器的宽高
	 */
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

		// 获得此ViewGroup上级容器为其推荐的宽和高，以及计算模式
		int widthMode = MeasureSpec.getMode(widthMeasureSpec);
		int heightMode = MeasureSpec.getMode(heightMeasureSpec);
		int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
		int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
		
		// 计算出所有的childView的宽和高
		measureChildren(widthMeasureSpec, heightMeasureSpec);
		width = sizeWidth;// ViewGroup 的宽
		height = topSpacing + bottomSpacing;// ViewGroup 的高

		int childCount = this.getChildCount();// 子View的总个数

		int childWidth = 0;// 子View的宽
		int childHeight = 0;// 子View的高

		int currentWidth = leftSpacing + rightSpacing;// 子View相加的 宽
		int currentHeight = 0;
		int row = 0;//子View的行数
		for (int i = 0; i < childCount; i++) {
			View childView = getChildAt(i);
			childWidth = childView.getMeasuredWidth();
			childHeight = childView.getMeasuredHeight();
			if (i == 0) {
				row++;
				currentWidth += childWidth;
				currentHeight = childHeight;
			} else {
				currentWidth += (childWidth + left_Right_Spacing);
			}
			if (currentWidth > width) {//当子View相加的宽大于父容器的宽时 自动换行 并重置currentWidth 和 currentHeight
				row++;
				currentWidth = leftSpacing + rightSpacing + childWidth;
				height += (currentHeight + top_Bottom_Spacing);
				currentHeight = childHeight;
			} else {
				if (childHeight > currentHeight) {
					currentHeight = childHeight;
				}
			}
			if(row <= umberRows)
			{
				scrollViewHeight = height+ currentHeight;
			}
		}
		height += currentHeight;
		groupHeight = height;
		Log.e("", "scrollViewHeight == "+scrollViewHeight);
		setMeasuredDimension(width, height);
	}
	
	public int getGroupViewheight()
	{
		return groupHeight;
	}
	

	@Override
	public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
		new MarginLayoutParams(getContext(), attrs);
		return super.generateLayoutParams(attrs);
	}
	
	/**
	 * 改变 scrollview高度的 回调接口
	 * @author linxi
	 *
	 */
	public interface MyViewGroupInterface
	{
		public void setScrollViewHeight(int scrollViewHeight,boolean isAdd);
	}

}

DpToPx

public class DpToPx {

	/**
	 * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
	 */
	public static int dip2px(Context context, float dpValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (dpValue * scale + 0.5f);
	}

	/**
	 * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
	 */
	public static int px2dip(Context context,float pxValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (pxValue / scale + 0.5f);
	}
	
     /**
      * 将px值转换为sp值，保证文字大小不变
      * 
      * @param pxValue
      * @param fontScale
      *            （DisplayMetrics类中属性scaledDensity）
      * @return
      */ 
     public static int px2sp(Context context, float pxValue) { 
         final float fontScale = context.getResources().getDisplayMetrics().scaledDensity; 
         return (int) (pxValue / fontScale + 0.5f); 
     } 
     
     /**
      * 将sp值转换为px值，保证文字大小不变
      * 
      * @param spValue
      * @param fontScale
      *            （DisplayMetrics类中属性scaledDensity）
      * @return
      */ 
     public static int sp2px(Context context, float spValue) { 
         final float fontScale = context.getResources().getDisplayMetrics().scaledDensity; 
         return (int) (spValue * fontScale + 0.5f); 
     }
     
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <View
        android:id="@+id/v"
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:layout_marginTop="10dp"
        android:background="#FF2525" />

    <ScrollView
        android:id="@+id/scrollview"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_below="@+id/v"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp" >

        <com.example.adaptivewidthheightviewgroup.MyViewGroup
            android:id="@+id/myviewgroup"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
        </com.example.adaptivewidthheightviewgroup.MyViewGroup>
    </ScrollView>

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:layout_below="@+id/scrollview"
        android:background="#195794" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
        android:paddingBottom="10dp"
        android:paddingTop="10dp" >

        <EditText
            android:id="@+id/edit"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/input_content"
            android:inputType="text"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:paddingTop="5dp"
            android:textColor="#000000"
            android:textSize="18sp" />

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="10dp"
            android:text="@string/add"
            android:textColor="#000000"
            android:textSize="18sp" />
    </LinearLayout>

</RelativeLayout>

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