Android--根据子控件的大小自动换行的ViewGroup

1、自定义ViewGroup

 /**
  * Created by Administrator on 2016/2/26.
  *
  * --------自动换行的ViewGroup-----------
  */
 public class LineWrapLayout extends ViewGroup {
     private static final boolean DEBUG = true;
     private static final String TAG = "AutoLineFeedLayout";

     /**
      * 左间距
      */
     private int paddingLeft = 10;
     /**
      * 右间距
      */
     private int paddingRight = 10;
     /**
      *
      */
     private int paddingTop = 10;
     /**
      *
      */
     private int paddingBottom = 10;

     /**
      * 水平方向间距
      */
     private int horizontalSpace = 10;
     /**
      * 行间距
      */
     private int verticalSpace = 5;

     private List<Integer> listX;
     private List<Integer> listY;

     public LineWrapLayout(Context context) {
         super(context);

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

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

     @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         if(DEBUG) Log.d(TAG, "--- onLayout changed :" + changed + " l :" + l + ",t :" + t + ",r :" + r + ",b :" + b);
         int count = getChildCount();
         int width = getWidth();
         Log.i(TAG, "宽度 :"+width);

         int startOffsetX = paddingLeft;// 横坐标开始
         int startOffsety = 0;//纵坐标开始
         int rowCount = 1;

         int preEndOffsetX = startOffsetX;

         for (int i = 0; i < count; i++) {
             final View childView = getChildAt(i);

             int w = childView.getMeasuredWidth();
             int h = childView.getMeasuredHeight();

             int x = listX.get(i);
             int y = listY.get(i);

             // 布局子控件
             childView.layout(x, y, x + w, y + h);
         }
     }
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         if(DEBUG) Log.v(TAG, "--- onMeasure()");

         int count = getChildCount();
         int width = measureWidth(widthMeasureSpec);
         Log.i(TAG, "宽度 :"+width);

         int startOffsetX = paddingLeft;// 横坐标开始
         int startOffsety = 0+paddingTop;//纵坐标开始
         int rowCount = 1;

         int preEndOffsetX = startOffsetX;

         listX.clear();
         listY.clear();
         for (int i = 0; i < count; i++) {
             Log.v(TAG, "----");
             final View childView = getChildAt(i);
             // 设置子空间Child的宽高
             childView.measure(0,0);
             /* 获取子控件Child的宽高 */
             int childWidth = childView.getMeasuredWidth();
             int childHeight = childView.getMeasuredHeight();
             Log.v(TAG, "childWidth :"+childWidth+" childHeight :"+childHeight);
             preEndOffsetX = startOffsetX + childWidth /*+ CHILD_MARGIN*/;
             //TODO [yaojian]margin属性？
             if (preEndOffsetX > width - paddingRight ) {
                 if (startOffsetX > paddingLeft) {
                     /* 换行  */
                     startOffsetX = paddingLeft;
                     startOffsety += childHeight+verticalSpace;
                     rowCount++;
                 }
             }
             Log.d(TAG, "measure child :"+startOffsetX+", "+startOffsety+", "+preEndOffsetX+", "+(startOffsety+childHeight));
             listX.add(startOffsetX);
             listY.add(startOffsety);

 //            childView.layout(startOffsetX, startOffsety, preEndOffsetX, startOffsety+childHeight);
             startOffsetX = startOffsetX + childWidth + horizontalSpace;
         }
         int lastLineHeight = 0;
         View lastChild = getChildAt(count-1);
         if(null != lastChild){
             lastLineHeight = lastChild.getMeasuredHeight();
         }
         setMeasuredDimension(measureWidth(widthMeasureSpec), startOffsety+lastLineHeight+paddingBottom);
 //        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

         // 注意setMeasuredDimension和resolveSize的用法
 //        setMeasuredDimension(resolveSize(measuredWidth, widthMeasureSpec),
 //                resolveSize(top, heightMeasureSpec));
     }

     private int measureWidth(int measureSpec) {
         int specMode = MeasureSpec.getMode(measureSpec);
         int specSize = MeasureSpec.getSize(measureSpec);

         // Default size if no limits are specified.
         int result = 400;

         if (specMode == MeasureSpec.AT_MOST) {
             // Calculate the ideal size of your control
             // within this maximum size.
             // If your control fills the available space
             // return the outer bound.
             result = specSize;
         } else if (specMode == MeasureSpec.EXACTLY) {
             // If your control can fit within these bounds return that value.
             result = specSize;
         }
         return result;
     }

     private void init(AttributeSet attrs) {
         TypedArray attrArray = getContext().obtainStyledAttributes(attrs, R.styleable.AutoLineFeedLayout);
         int attrCount = attrArray.getIndexCount();
         for (int i = 0; i < attrCount; i++) {
             int attrId = attrArray.getIndex(i);
             switch (attrId) {
                 case R.styleable.AutoLineFeedLayout_horizontalSpacing:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     horizontalSpace = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_verticalSpacing:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     verticalSpace = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_paddingBottom:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     paddingBottom = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_paddingLeft:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     paddingLeft = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_paddingRight:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     paddingRight = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_paddingTop:{
                     float dimen = attrArray.getDimension(attrId, 0);
                     paddingTop = (int) dimen;
                 }
                 break;
                 case R.styleable.AutoLineFeedLayout_debug:{

                 }
                 break;

                 default:
                     break;
             }

         }

         listX = new ArrayList<Integer>();
         listY = new ArrayList<Integer>();
     }
 }

2、有一部分自定义属性可供使用 attrs.xml

    <declare-styleable name="AutoLineFeedLayout">
        <attr name="debug" format="boolean"></attr>

        <attr name="paddingLeft" format="reference|dimension"/>
        <attr name="paddingRight" format="reference|dimension"/>
        <attr name="paddingTop" format="reference|dimension"/>
        <attr name="paddingBottom" format="reference|dimension"/>

        <attr name="verticalSpacing" format="reference|dimension"/>
        <attr name="horizontalSpacing" format="reference|dimension"/>
    </declare-styleable>

3、在布局文件中和普通ViewGroup使用相同

4、在Activity中动态添加View或者ViewGroup

for (int i = 0;i < myData.getList().length;i++){
                        View child = View.inflate(ZhuanTiActivity.this,R.layout.item_mygridview_layout,null);
                        TextView textView = (TextView) child.findViewById(R.id.tv_title_item);
                        textView.setText(myData.getList()[i].getName());
                        textView.setTextColor(Color.argb(255, colorR, colorG, colorB));
                        textView.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                Log.d("aaa",textView.getText());
                            }
                        });
                        custom_index_zhuanTiActivity.addView(child);
                    }