以 imageView 的大小显示 drawable 以用作占位符

Question

我检查过的朋友get drawable exactly the size of the imageView to use as a placeholder

但这对我没有帮助

我的问题是我想显示一个完全符合图像大小的占位符

图像大小是动态的，我从服务器获取图像高度和宽度，使用它来计算调整后的宽度和高度

例如，在列表的一行中，我必须显示 400 * 300 大小的图像，而在另一行中，我必须显示 700 * 500 大小的图像

现在我希望占位符在第一种情况下填充 400*300 区域，在第二种情况下填充 700*500 区域，这是我无法实现的，

我怎样才能做到这一点？

mDisplayImageOptions = new DisplayImageOptions.Builder()
                .resetViewBeforeLoading(true)
                .imageScaleType(ImageScaleType.EXACTLY)
                .showImageOnLoading(R.drawable.test_user)
                .cacheInMemory(true)
                .cacheOnDisk(true)
                .build();



    mAdjustedWidth = mWindowWidth - 10;
            mAdjustedHeight = 400;
            try {
                int width = cursor.getInt(cursor.getColumnIndexOrThrow(TalkTable.TALK_TWIDTH));
                if(width > 0) {
                    mAdjustedHeight = (mAdjustedWidth * cursor.getInt(cursor.getColumnIndexOrThrow(TalkTable.TALK_THEIGHT))) / width;
                }
            }catch (Exception ex){
                ex.printStackTrace();
            }
            talkImageView.getLayoutParams().height = mAdjustedHeight;
            talkImageView.getLayoutParams().width = mAdjustedWidth;
            talkImageView.requestLayout();

 mImageLoader.displayImage(talkImageThumbnil,talkImageView,mTalksDisplayImageOptions,new SimpleImageLoadingListener(){
                @Override
                public void onLoadingStarted(String imageUri, View view) {
                    // ProgressBar progressBar1 = (ProgressBar)progressBar.getTag();
                    //progressBar1.setVisibility(View.VISIBLE);
                    talkImageView.getLayoutParams().height = mAdjustedHeight;
                    talkImageView.getLayoutParams().width = mAdjustedWidth;
                    talkImageView.requestLayout();
                    talkImageView.setImageResource(R.drawable.image_place_holder);
                    Log.d(TAG, " Progress bar  visisble ");
                }

                @Override
                public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                    //ProgressBar progressBar1 = (ProgressBar)progressBar.getTag();
                    //progressBar1.setVisibility(View.GONE);
                }

                @Override
                public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                    //ProgressBar progressBar1 = (ProgressBar)progressBar.getTag();
                    //progressBar1.setVisibility(View.GONE);
                }

                @Override
                public void onLoadingCancelled(String imageUri, View view) {
                    //ProgressBar progressBar1 = (ProgressBar)progressBar.getTag();
                    //progressBar1.setVisibility(View.GONE);
                }

            });

XML 图像视图

我一直在为此苦苦挣扎，请帮助我

图片下载前占位符是这样的

图片下载后如下图所示

我希望占位符填充即将显示的图像的确切高度和宽度

Answer 1

将 ImageView 的比例类型设置为 fitCenter ？