自定义view group 1

https://github.com/wanglianghai/CutomViewGroup1
注意：子view必须测量
1.创建
scroll view的子视图match_parent无效所以只有totalHeight没有heightSize
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

super.onMeasure(widthMeasureSpec, heightMeasureSpec);        //1.看需要给出大小        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int widthSize = MeasureSpec.getSize(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        int heightSize = MeasureSpec.getSize(heightMeasureSpec);//插入1if (widthMode == MeasureSpec.AT_MOST && heightMode == MeasureSpec.AT_MOST) {            setMeasuredDimension(totalWidth, totalHeight);        } else if (widthMode == MeasureSpec.AT_MOST) {            setMeasuredDimension(totalWidth, totalHeight);        } else if (heightMode == MeasureSpec.AT_MOST) {            setMeasuredDimension(widthSize, totalHeight);        } else {            setMeasuredDimension(widthSize, totalHeight);        }

插入1//计算的里面的view的值

int totalWidth = 0, totalHeight = 0;        for (int i = 0; i < getChildCount(); i++) {            View v = getChildAt(i);            measureChild(v, widthMeasureSpec, heightMeasureSpec);//必须测量子view            totalWidth = v.getMeasuredWidth();            totalHeight += v.getMeasuredHeight();        }

// 布局dp会改变比例值， 布局先加载在加载代码    //view group布局的onLayout    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        l = 0;        t = 0;        for (int i = 0; i < getChildCount(); i++) {            View v = getChildAt(i);            int preHeight = v.getMeasuredHeight();            //layout ：relative to parent            if (l + v.getMeasuredWidth() > r) {                l = 0;            }            v.layout(l, t, l += v.getMeasuredWidth(), t += preHeight);        }    }

2.使用
view group 中的 child view
image_item.xml

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"           android:id="@+id/imageView"           android:layout_width="100dp"           android:layout_height="100dp"           android:scaleType="fitXY"           android:src="@mipmap/ic_launcher"></ImageView>

activity中：实例化child view

ImageView image = (ImageView) LayoutInflater.from(this).inflate(R.layout.image_item, viewGroup, false);

CustomViewGroup viewGroup = (CustomViewGroup)findViewById(R.id.custom_view);//找到布局中的自定义视图viewGroup.addView(image);//用add添加