Picasso封裝優化

分類：技術 時間:2017-01-13

Picasso在使用過程中，經常忘記一些設置，比如圖片的加載方式.centerCrop()，圖片的加載優化.fit（），以及對圖片的url的處理，因此對圖片加載進行統一封裝，使用相同的加載方式更有利于后期的維護和擴展。

圖片的加載來源

圖片的加載來源主要是String，file，Resource，我們都有相應的封裝，

為了介紹方便

以下僅僅介紹String方式，以下同時有centerCrop和centerInside，同樣我只是介紹centerCrop方式。

示例代碼，對應三種加載方式：

public static void loadCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    Picasso.with(context)
        .load(checkAndHandleUrl(path))
        .placeholder(placeholderResId)
        .error(errorResId)
        .centerCrop()
        .fit()
        //.tag(context)
        .into(target);
  }

  public static void loadCenterCrop(@NonNull Context context, @NonNull int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerCrop()
          .fit()
          .into(target);
    }
  }

  public static void loadCenterCrop(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerCrop()
          .fit()
          .into(target);
    }
  }

主要的封裝場景

1.正常加載圖片

public static void loadCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    Picasso.with(context)
        .load(checkAndHandleUrl(path))
        .placeholder(placeholderResId)
        .error(errorResId)
        .centerCrop()
        .fit()
        //.tag(context)
        .into(target);
  }

加載帶圓角的圖片

public static void loaderRoundConnerCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (path == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerCrop()
          .fit()
          .into(target);
    }
  }

加載圓形圖片（常用于圓形頭像）

public static void loaderCircleCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (path == null || path.trim().isEmpty()) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerCrop()
          .fit()
          .into(target);
    }
  }

這些常用的方式都有封裝，如果統一調用更方便代碼的擴展和維護。

核心代碼如下：

public class NewImageLoader {

  private NewImageLoader() {
    throw new IllegalStateException(quot;no instancequot;);
  }

  private static lt;Tgt; void checkNull(T object, String message) {
    if (object == null) {
      throw new NullPointerException(message);
    }
  }

  /**
   * 檢查傳入的url或者數組中第一個url是不是為空
   */
  @SuppressWarnings(quot;uncheckquot;) public static boolean isUrlsEmpty(String... urls) {
    return urls == null || urls.length == 0 || urls[0] == null || urls[0].trim().isEmpty();
  }

  @SuppressWarnings(quot;uncheckquot;) public static String checkAndHandleUrl(String... urls) {
    if (isUrlsEmpty(urls)) {
      return quot;empty_urlquot;;
    }
    return urls[0];
  }

  public static Picasso getInstance(Context context) {
    return Picasso.with(context);
  }

  public static void load(@NonNull Context context, String path, @DrawableRes int placeholderResId,
      @NonNull ImageView target) {
    Picasso.with(context)
        .load(checkAndHandleUrl(path))
        .placeholder(placeholderResId)
        .error(placeholderResId)
        .into(target);
  }

  /**
   * 默認圖為{@link R.drawable.img_defult}
   */
  public static void loadCenterCrop(@NonNull Context context, String path,
      @NonNull ImageView target) {
    loadCenterCrop(context, path, R.drawable.img_defult, target);
  }

  public static void loadCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @NonNull ImageView target) {
    loadCenterCrop(context, path, placeholderResId, placeholderResId, target);
  }

  public static void loadCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    Picasso.with(context)
        .load(checkAndHandleUrl(path))
        .placeholder(placeholderResId)
        .error(errorResId)
        .centerCrop()
        .fit()
        //.tag(context)
        .into(target);
  }

  public static void loadCenterCrop(@NonNull Context context, @NonNull int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerCrop()
          .fit()
          .into(target);
    }
  }

  public static void loadCenterCrop(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerCrop()
          .fit()
          .into(target);
    }
  }
  /**
   * 以下三個方法是centerCrop方式加載帶圓角的圖片
   */
  public static void loaderRoundConnerCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (path == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerCrop()
          .fit()
          .into(target);
    }
  }
  public static void loaderRoundConnerCenterCrop(@NonNull Context context, int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerCrop()
          .fit()
          .into(target);
    }
  }
  public static void loaderRoundConnerCenterCrop(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerCrop()
          .fit()
          .into(target);
    }
  }
  /**
   * 以下三個方法是centerCrop方式加載圓形的圖片
   */
  public static void loaderCircleCenterCrop(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (path == null || path.trim().isEmpty()) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerCrop()
          .fit()
          .into(target);
    }
  }

  public static void loaderCircleCenterCrop(@NonNull Context context, @NonNull int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {

    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerCrop()
          .fit()
          .into(target);
    }
  }

  public static void loaderCircleCenterCrop(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerCrop()
          .fit()
          .into(target);
    }
  }

  /****************************** CenterInside ***************************************/
  public static void loaderCenterInside(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (path == null || path.trim().isEmpty()) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerInside()
          .fit()
          .into(target);
    }
  }

  public static void loaderCenterInside(@NonNull Context context, @NonNull int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {

    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerInside()
          .fit()
          .into(target);
    }
  }

  public static void loaderCenterInside(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .centerInside()
          .fit()
          .into(target);
    }
  }
  /**
   * 以下三個方法是centerInside方式加載帶圓角的圖片
   */

  public static void loaderRoundConnerCenterInside(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (path == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(checkAndHandleUrl(path))
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerInside()
          .fit()
          .into(target);
    }
  }
  public static void loaderRoundConnerCenterInside(@NonNull Context context, int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerInside()
          .fit()
          .into(target);
    }
  }
  public static void loaderRoundConnerCenterInside(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target,
      @NonNull int radius, @NonNull int margin) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new RoundedCornersTransformation(DensityUtil.dip2px(context, radius), margin))
          .centerInside()
          .fit()
          .into(target);
    }
  }
  /**
   * 以下三個方法是centerInside方式加載圓形的圖片
   */
  public static void loaderCircleCenterInside(@NonNull Context context, String path,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (path == null || path.trim().isEmpty()) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(path)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerInside()
          .fit()
          .into(target);
    }
  }

  public static void loaderCircleCenterInside(@NonNull Context context, @NonNull int resourceId,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {

    if (resourceId == 0) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(resourceId)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerInside()
          .fit()
          .into(target);
    }
  }

  public static void loaderCircleCenterInside(@NonNull Context context, File file,
      @DrawableRes int placeholderResId, @DrawableRes int errorResId, @NonNull ImageView target) {
    if (file == null) {
      target.setImageDrawable(context.getResources().getDrawable(placeholderResId));
    } else {
      Picasso.with(context)
          .load(file)
          .placeholder(placeholderResId)
          .error(errorResId)
          .transform(new CropCircleTransformation())
          .centerInside()
          .fit()
          .into(target);
    }
  }
}

Tags: 安卓開發

文章來源：http://blog.csdn.net/lpjishu/article/details/54381

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