tianyalu / nescreenadapterpercentlayout

手写百分比布局适配（类谷歌）

NeScreenAdapterPercentLayout 手写百分比布局适配（类谷歌）

类似谷歌的百分比布局适配，手写自定义View

PercentLayout代码如下所示：

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      //获取父容器的尺寸
      int widthSize = MeasureSpec.getSize(widthMeasureSpec);
      int heightSize = MeasureSpec.getSize(heightMeasureSpec);
      int count = getChildCount();
      for (int i = 0; i < count; i++) {
          View child = getChildAt(i);
          ViewGroup.LayoutParams params = child.getLayoutParams();
          //如果说是百分比布局属性
          if (checkLayoutParams(params)) {
              LayoutParams lp = (LayoutParams) params;
              float widthPercent = lp.widthPercent;
              float heightPercent = lp.heightPercent;
              float marginLeftPercent = lp.marginLeftPercent;
              float marginRightPercent = lp.marginRightPercent;
              float marginTopPercent = lp.marginTopPercent;
              float marginBottomPercent = lp.marginBottomPercent;
  
              if(widthPercent > 0) {
                  params.width = (int) (widthSize * widthPercent);
              }
              if(heightPercent > 0) {
                  params.height = (int) (heightSize * heightPercent);
              }
              if(marginLeftPercent > 0) {
                  ((LayoutParams) params).leftMargin = (int) (widthSize * marginLeftPercent);
              }
              if(marginRightPercent > 0) {
                  ((LayoutParams) params).rightMargin = (int) (widthSize * marginRightPercent);
              }
              if(marginTopPercent > 0) {
                  ((LayoutParams) params).topMargin = (int) (heightSize * marginTopPercent);
              }
              if(marginBottomPercent > 0) {
                  ((LayoutParams) params).bottomMargin = (int) (heightSize * marginBottomPercent);
              }
          }
      }
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  }
  
  @Override
  protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
      return p instanceof LayoutParams;
  }
  
  public LayoutParams generateLayoutParams(AttributeSet attrs) {
      return new LayoutParams(getContext(), attrs);
  }
  
  public static class LayoutParams extends RelativeLayout.LayoutParams {
      private float widthPercent;
      private float heightPercent;
      private float marginLeftPercent;
      private float marginRightPercent;
      private float marginTopPercent;
      private float marginBottomPercent;
  
      public LayoutParams(Context c, AttributeSet attrs) {
          super(c, attrs);
          //解析自定义控件
          TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.PercentLayout);
          widthPercent = a.getFloat(R.styleable.PercentLayout_widthPercent, 0);
          heightPercent = a.getFloat(R.styleable.PercentLayout_heightPercent, 0);
          marginLeftPercent = a.getFloat(R.styleable.PercentLayout_marginLeftPercent, 0);
          marginRightPercent = a.getFloat(R.styleable.PercentLayout_marginRightPercent, 0);
          marginRightPercent = a.getFloat(R.styleable.PercentLayout_marginRightPercent, 0);
          marginBottomPercent = a.getFloat(R.styleable.PercentLayout_marginBottomPercent, 0);
          a.recycle();
      }
  }

示例如下图所示：