Fresco进阶 图片错位 宽高自适应

 

一、Fresco图片错位

在recycleview的adapter中 定义了一组view

 

 

 

Adapter 中的实现如下：

        gholder.sdv_item_person_pic1.setVisibility(View.GONE);
        gholder.sdv_item_person_pic2.setVisibility(View.GONE);
        gholder.sdv_item_person_pic3.setVisibility(View.GONE);

        for (int i = 0; i < size; i++) {
            OrderItem.ServeListBean serveListBean = serveList.get(i);
//            LogUtil.i("pic..." + pic);
            switch (i) {
                case 0:
                    if (serveListBean != null) {
                        gholder.sdv_item_person_pic1.setVisibility(View.VISIBLE);
                    }
                    if (!TextUtils.isEmpty(serveListBean.getProductImg())) {
                        gholder.sdv_item_person_pic1.setImageURI(Uri.parse(serveListBean.getProductImg()));
                    }
                    break;

                case 1:
                    if (serveListBean != null) {
                        gholder.sdv_item_person_pic2.setVisibility(View.VISIBLE);
                    }
                    if (!TextUtils.isEmpty(serveListBean.getProductImg())) {
                        gholder.sdv_item_person_pic2.setImageURI(Uri.parse(serveListBean.getProductImg()));
                    }
                    break;

                case 2:
                    if (serveListBean != null) {
                        gholder.sdv_item_person_pic3.setVisibility(View.VISIBLE);
                    }
                    if (!TextUtils.isEmpty(serveListBean.getProductImg())) {
                        gholder.sdv_item_person_pic3.setImageURI(Uri.parse(serveListBean.getProductImg()));
                    }
                    break;
            }

        }
    }

虽然初始化为不显示，并正确判断了url非空显示，但是还是有图片的错位参数

 

下面为修改正确的结果：

 

 

        ArrayList piclist = new ArrayList<>();

        for (int i = 0; i < size; i++) {
            if (serveList.get(i) != null) {
                piclist.add(serveList.get(i).getProductImg());
            } else {
                piclist.add("");
            }

        }
        holder.rlv_threesdv.setAdapter(new SdvAdapter(mcontext, piclist));

 

SdvAdapter中的onBindViewHolderonBindViewHolder

 

public void onBindViewHolder(final SdvAdapterViewHoder holder, int position) {

        if (!Tools.isNull(list.get(position) + ""))
            holder.sdv.setImageURI(Uri.parse(list.get(position) + ""));


    }

用一个新的recycleview放在adapter的itemView中处理了图片错位的问题

 

 

 

二、图片宽高自适应

有两种方法 第一种是设置固定宽高比例扩充  另一种是通过宽度来计算高度

 

1、只有希望显示固定的宽高比时，可以使用wrap_content。
如果希望图片以特定的宽高比例显示，例如 4:3，可以在XML中指定:

 

 

在代码中指定宽高比例

mSimpleDraweeView.setAspectRatio(1.33f);

 

2、宽度来计算高度 可以通过监听下载事件实现

 

监听下载事件：

 

ControllerListener controllerListener = new BaseControllerListener() {
    @Override
    public void onFinalImageSet(
        String id,
        @Nullable ImageInfo imageInfo,
        @Nullable Animatable anim) {
      if (imageInfo == null) {
        return;
      }
      QualityInfo qualityInfo = imageInfo.getQualityInfo();
      FLog.d("Final image received! " +
          "Size %d x %d",
          "Quality level %d, good enough: %s, full quality: %s",
          imageInfo.getWidth(),
          imageInfo.getHeight(),
          qualityInfo.getQuality(),
          qualityInfo.isOfGoodEnoughQuality(),
          qualityInfo.isOfFullQuality());
    }

    @Override
    public void onIntermediateImageSet(String id, @Nullable ImageInfo imageInfo) {
      FLog.d("Intermediate image received");
    }

    @Override
    public void onFailure(String id, Throwable throwable) {
      FLog.e(getClass(), throwable, "Error loading %s", id)
    }
};

Uri uri;
DraweeController controller = Fresco.newDraweeControllerBuilder()
    .setControllerListener(controllerListener)
    .setUri(uri)
    // other setters
    .build();
mSimpleDraweeView.setController(controller);

 

 

 

 

 

修改的方法：

 

 /**
     * 通过imageWidth 的宽度，自动适应高度
     * * @param simpleDraweeView view
     * * @param imagePath  Uri
     * * @param imageWidth width
     */
    public static void setControllerListener(final SimpleDraweeView simpleDraweeView, String imagePath, final int imageWidth) {
        final ViewGroup.LayoutParams layoutParams = simpleDraweeView.getLayoutParams();
        ControllerListener controllerListener = new BaseControllerListener() {
            @Override
            public void onFinalImageSet(String id, @Nullable ImageInfo imageInfo, @Nullable Animatable anim) {
                if (imageInfo == null) {
                    return;
                }
                int height = imageInfo.getHeight();
                int width = imageInfo.getWidth();
                layoutParams.width = imageWidth;
                layoutParams.height = (int) ((float) (imageWidth * height) / (float) width);
                simpleDraweeView.setLayoutParams(layoutParams);
            }

            @Override
            public void onIntermediateImageSet(String id, @Nullable ImageInfo imageInfo) {
                Log.d("TAG", "Intermediate image received");
            }

            @Override
            public void onFailure(String id, Throwable throwable) {
                throwable.printStackTrace();
            }
        };
        DraweeController controller = Fresco.newDraweeControllerBuilder().setControllerListener(controllerListener).setUri(Uri.parse(imagePath)).build();
        simpleDraweeView.setController(controller);
    }

 

我在RecycleViewAdapter的实现

 

 

ScreenUtil:

 

public static int getScreenWidth(Context context) {
		WindowManager wm = (WindowManager) context
				.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics outMetrics = new DisplayMetrics();
		wm.getDefaultDisplay().getMetrics(outMetrics);
		return outMetrics.widthPixels;
	}

 

 

 

 

 

 

    @Override
    public void onBindViewHolder(SimpleImageHolder holder, int position) {

        if (!Tools.isNull(list.get(position))) {
//            holder.sdv_simple.setImageURI(Uri.parse(list.get(position)));
            Tools.setControllerListener(holder.sdv_simple, list.get(position),
                    ScreenUtil.getScreenWidth(context));
        }


    }