百分比适配技术

布局文件

<?xml version="1.0" encoding="utf-8"?>
<com.luisliuyi.percentlayout.demo.PercentRelativelayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">

   <TextView
       android:id="@+id/text"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Hello World!"
       android:background="#f00"
       android:gravity="center"
       app:widthPercent="0.5"
       app:heightPercent="0.5"
       app:marginLeftPercent="0.25"
       app:marginTopPercent="0.25"
       />

</com.luisliuyi.percentlayout.demo.PercentRelativelayout>

百分比ViewGroup

 /**
 * @author LiuYi
 * @date 2022/6/1 9:45 
 * @description:
 **/
public class PercentRelativelayout extends RelativeLayout {
  public PercentRelativelayout(Context context) {
    super(context);
  }

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

  public PercentRelativelayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int widthSize = MeasureSpec.getSize(widthMeasureSpec);
    int heightSize = MeasureSpec.getSize(heightMeasureSpec);

    for (int i = 0; i < getChildCount(); i++) {
      View child = getChildAt(i);
      if (child.getLayoutParams() instanceof  LayoutParams) {
        LayoutParams layoutParams = (LayoutParams) child.getLayoutParams();
        float widthPercent = layoutParams.widthPercent;
        float heightPercent = layoutParams.heightPercent;
        float marginLeftPercent = layoutParams.marginLeftPercent;
        float marginRightPercent = layoutParams.marginRightPercent;
        float marginTopPercent = layoutParams.marginTopPercent;
        float marginBottomPercent = layoutParams.marginBottomPercent;

        if (widthPercent > 0) {
          layoutParams.width = (int) (widthSize * widthPercent);
        }
        if (heightPercent > 0){
          layoutParams.height = (int) (heightSize * heightPercent);
        }

        if (marginLeftPercent > 0){
          layoutParams.leftMargin = (int) (widthSize * marginLeftPercent);
        }

        if (marginRightPercent > 0){
          layoutParams.rightMargin = (int) (widthSize * marginRightPercent);
        }

        if (marginTopPercent > 0){
          layoutParams.topMargin = (int) (heightSize * marginTopPercent);
        }

        if (marginBottomPercent > 0){
          layoutParams.bottomMargin = (int) (heightSize * marginBottomPercent);
        }
      }
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
  }

  @Override
  public RelativeLayout.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);
      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);
      marginTopPercent = a.getFloat(R.styleable.PercentLayout_marginTopPercent, 0);
      marginBottomPercent = a.getFloat(R.styleable.PercentLayout_marginBottomPercent, 0);
      a.recycle();
    }

    public LayoutParams(int w, int h) {
      super(w, h);
    }
  }
}

定义attr

 <?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="PercentLayout">
    <attr name="widthPercent" format="float" />
    <attr name="heightPercent" format="float" />
    <attr name="marginLeftPercent" format="float" />
    <attr name="marginRightPercent" format="float" />
    <attr name="marginTopPercent" format="float" />
    <attr name="marginBottomPercent" format="float" />
    </declare-styleable>
</resources>

显示效果

image.png

第三方库

 https://github.com/hongyangAndroid/android-percent-support-extend

 https://github.com/SenhLinsh/LshPercentLayout