<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent">

  <ImageView
    android:id="@+id/blurredview_blurred_img"
    .../>

  <ImageView
    android:id="@+id/blurredview_origin_img"
    .../>

</FrameLayout>

<resources>
  <declare-styleable name="BlurredView">
    <attr name="src" format="reference"/>
    <attr name="disableBlurred" format="boolean"/>
  </declare-styleable>
</resources>

/**
 * @author Qiushui
 * @description 自定義模糊View類
 * @revision Xiarui 16.09.05
 */
public class BlurredView extends RelativeLayout {

  /*========== 全局相關 ==========*/
  private Context mContext;//上下文對象
  private static final int ALPHA_MAX_VALUE = 255;//透明最大值
  private static final float BLUR_RADIUS = 25f;//最大模糊度(在0.0到25.0之間)

  /*========== 圖片相關 ==========*/
  private ImageView mOriginImg;//原圖ImageView
  private ImageView mBlurredImg;//模糊后的ImageView
  private Bitmap mBlurredBitmap;//模糊后的Bitmap
  private Bitmap mOriginBitmap;//原圖Bitmap

  /*========== 屬性相關 ==========*/
  private boolean isDisableBlurred;//是否禁用模糊效果

  ...

  /**
   * 以代碼的方式添加待模糊的圖片
   *
   * @param blurredBitmap 待模糊的圖片
   */
  public void setBlurredImg(Bitmap blurredBitmap) {
    if (null != blurredBitmap) {
      mOriginBitmap = blurredBitmap;
      mBlurredBitmap = BlurBitmapUtil.blurBitmap(mContext, blurredBitmap, BLUR_RADIUS);
      setImageView();
    }
  }
  ...

  /**
   * 填充ImageView
   */
  private void setImageView() {
    mBlurredImg.setImageBitmap(mBlurredBitmap);
    mOriginImg.setImageBitmap(mOriginBitmap);
  }

  /**
   * 設置模糊程度
   *
   * @param level 模糊程度, 數(shù)值在 0~100 之間.
   */
  @SuppressWarnings("deprecation")
  public void setBlurredLevel(int level) {
    //超過模糊級別范圍 直接拋異常
    if (level < 0 || level > 100) {
      throw new IllegalStateException("No validate level, the value must be 0~100");
    }

    //禁用模糊直接返回
    if (isDisableBlurred) {
      return;
    }

    //設置透明度
    mOriginImg.setAlpha((int) (ALPHA_MAX_VALUE - level * 2.55));
  }

  ...
}

 <com.blurdemo.view.BlurredView
    android:id="@+id/bv_custom_blur"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:src="@raw/pic"
    app:disableBlurred="false" />

private void initView() {
    customBView = (BlurredView) findViewById(R.id.bv_custom_blur);
    //設置模糊度
    customBView.setBlurredLevel(100);
  }

/**
 * 初始化View
 */
private void initView() {
  customBView = (BlurredView) findViewById(R.id.bv_dynamic_blur);
  //設置初始模糊度
  initLevel = 100;
  customBView.setBlurredLevel(initLevel);
}

/**
 * 觸摸事件
 */
@Override
public boolean onTouchEvent(MotionEvent ev) {
  switch (ev.getAction()) {
    case MotionEvent.ACTION_DOWN:
      downY = ev.getY();
      break;

    case MotionEvent.ACTION_MOVE:
      float moveY = ev.getY();
      //手指滑動距離
      float offsetY = moveY - downY;
      //屏幕高度 十倍是為了看出展示效果
      int screenY = getWindowManager().getDefaultDisplay().getHeight() * 10;
      //手指滑動距離占屏幕的百分比
      movePercent = offsetY / screenY;
      currentLevel = initLevel + (int) (movePercent * 100);
      if (currentLevel < 0) {
        currentLevel = 0;
      }
      if (currentLevel > 100) {
        currentLevel = 100;
      }
      //設置模糊度
      customBView.setBlurredLevel(currentLevel);
      //更改初始模糊等級
      initLevel = currentLevel;
      break;
    case MotionEvent.ACTION_UP:
      break;
  }
  return super.onTouchEvent(ev);
}

 //RecyclerView 滾動監(jiān)聽
  mainRView.setOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
      super.onScrollStateChanged(recyclerView, newState);
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
      super.onScrolled(recyclerView, dx, dy);
      //滾動距離
      mScrollerY += dy;
      //根據(jù)滾動距離控制模糊程度 滾動距離是模糊程度的十倍
      if (Math.abs(mScrollerY) > 1000) {
        mAlpha = 100;
      } else {
        mAlpha = Math.abs(mScrollerY) / 10;
      }
      //設置透明度等級
      recyclerBView.setBlurredLevel(mAlpha);
    }
  });