package com.example.demoapp.views;

import android.content.Context;
import android.view.View;

public class MeasuredView extends View {
  public MeasuredView(Context context) {
    super(context);
  }
  
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    // 调用父类的onMeasure()
    super.onMeasure(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));
    // 或者直接调用父类的setMeasuredDimension(),因为父类的onMeasure()最终调用了setMeasuredDimension()
    // setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));
  }
  
  /**
   * 测量View的width
   * @param measureSpec MeasureSpec对象
   * @return View的width
   */
  private int measureWidth(int measureSpec) {
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);
    
    if (specMode == MeasureSpec.EXACTLY) {
      result = specSize;
    } else {
      result = 200;
      if (specMode == MeasureSpec.AT_MOST) {
        result = Math.min(result, specSize);
      }
    }
    return result;
  }
  
  /**
   * 测量View的height
   * @param measureSpec MeasureSpec对象
   * @return View的height
   */
  private int measureHeight(int measureSpec) {
    int result = 0;
    int specMode = MeasureSpec.getMode(measureSpec);
    int specSize = MeasureSpec.getSize(measureSpec);
    
    if (specMode == MeasureSpec.EXACTLY) {
      result = specSize;
    } else {
      result = 200;
      if (specMode == MeasureSpec.AT_MOST) {
        result = Math.min(result, specSize);
      }
    }
    return result;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="customAttr">
    <attr name="title" format="string" />
    <attr name="fontSize" format="dimension" />
    <attr name="fontColor" format="color" />
    <attr name="background" format="reference|color" />
    <attr name="fontStyle" format="enum" />
    <attr name="shadeSupport" format="boolean" />
  </declare-styleable>
</resources>

package com.jy.myrecyclerview.test;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;

import com.jy.myrecyclerview.R;

/**
 * Created by 123 on 2016/5/6.
 */
public class TestCustomAttrs extends View {
  private Context mContext;
  private AttributeSet mAttrs;
  private String mTitle;
  private float mFontSize;
  private int mFontColor;
  private int mBackground;
  private int mFontStyle;
  private boolean mShadeSupport;

  public TestCustomAttrs(Context context) {
    super(context);
    this.mContext = context;
  }

  public TestCustomAttrs(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.mContext = context;
    this.mAttrs = attrs;
  }

  public TestCustomAttrs(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.mContext = context;
    this.mAttrs = attrs;
  }

  private void getCustomAttrs() {
    TypedArray ta = mContext.obtainStyledAttributes(mAttrs, R.styleable.customAttr);
    mTitle = ta.getString(R.styleable.customAttr_title);
    mFontSize = ta.getDimension(R.styleable.customAttr_fontSize, 10);
    mFontColor = ta.getColor(R.styleable.customAttr_fontColor, 0);
    mBackground = ta.getColor(R.styleable.customAttr_background, 0);
    mFontStyle = ta.getInt(R.styleable.customAttr_fontStyle, 0);
    mShadeSupport = ta.getBoolean(R.styleable.customAttr_shadeSupport, false);
    ta.recycle();
  }
}
　　

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:custom="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent" >

  <com.jy.myrecyclerview.test.TestCustomAttrs
    android:id="@+id/id_recyclerview"
    android:divider="#ffff0000"
    android:dividerHeight="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    custom:title="title"
    custom:fontSize="12sp"
    custom:fontColor="@color/colorPrimary"
    custom:background="@color/colorPrimary"
    custom:shadeSupport="false" />

</RelativeLayout>