我正在使用 fresco 在 ListView 中显示图像。但是我有一个问题。
当我使用像 CENTER_CROP 这样保持宽高比的方法缩放我的图像时,缩放后的图像高度变得小于我的 simpledraweeview 的高度,simple-Drawee-View 不会自动调整大小以匹配缩放图像的大小。强>
- 我尝试过使用
android:adjustViewBounds = true
但它不起作用。 我也试过下面的方法,但是 scaleY 我想用来计算缩放高度 返回 1 即使图像高度小于 simpe-drawee - View 的高度
float[] f = new float[9] draweeView.getImageMatrix().getValues(f); float scaleY = f[Matrix.MSCALE_Y]; Log.d("App","scale y is "+ scaleY);
上面的codlet在下面的方法中使用
private void loadImage(Uri fileUri,final SimpleDraweeView draweeView,int myImageHeight){
draweeView.getLayoutParams().width = displayWidth;
int selectedSize = (myImageHeight > displayWidth)? displayWidth : myImageHeight;
draweeView.getLayoutParams().height= selectedSize;
GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(context.getResources());
GenericDraweeHierarchy hierarchy = builder
.setProgressBarImage(new CircleProgressBarDrawable())
.setActualImageScaleType(ScalingUtils.ScaleType.CENTER_CROP)
.build();
ImageRequest requestBuilder = ImageRequestBuilder.newBuilderWithSource(fileUri)
.setProgressiveRenderingEnabled(true)
.build();
//ImagePipeline imagePipeline = Fresco.getImagePipeline();
DraweeController controller = Fresco.newDraweeControllerBuilder()
.setOldController(draweeView.getController())
.setImageRequest(requestBuilder)
.build();
draweeView.setHierarchy(hierarchy);
draweeView.setController(controller);
float[] f = new float[9]
draweeView.getImageMatrix().getValues(f);
float scaleY = f[Matrix.MSCALE_Y];
Log.d("App","scale y is "+ scaleY);
}
结果:红色表示未填充图像的简单受票人 View 部分。这是比例类型 FIT_CENTER。当我使用 CENTER_CROP 时,图像会填满整个 ImageView ,图像的某些部分会被切掉,我不希望这样
问:如何获得缩放后的图像大小并使用它来调整我的 simpleDraweeView 的大小,或者换句话说,我如何让我的 simpleDraweeView 调整它的大小?
我将不胜感激。
最佳答案
为了调整 simpledraweeview 的大小,我实现了一个 ControllerListener
并根据需要更改了 simpleDraweeView
的高度。
private void loadImage(Uri fileUri,final SimpleDraweeView simpeDraweeView) {
GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(context.getResources());
GenericDraweeHierarchy hierarchy = builder
.setProgressBarImage(new CircleProgressBarDrawable())
.setActualImageScaleType(ScalingUtils.ScaleType.CENTER_CROP)
.build();
ImageRequest requestBuilder = ImageRequestBuilder.newBuilderWithSource(fileUri)
.setProgressiveRenderingEnabled(true)
.build();
ControllerListener<ImageInfo> contollerListener = new BaseContollerListener<ImageInfo>() {
public void onFinalImageSet(String id, ImageInfo imageinfo,Animatable animatable) {
if(imageinfo != null) {
updateViewSize(imageinfo)
}
}
DraweeContoller contoller = Fresco.newDraweeContollerBuilder()
.setContollerListener(contollerListener)
.setImageRequest(requestBuilder)
.build();
simpleDraweeView.setHierarchy(hierarchy);
simpleDraweeView.setController(contoller);
}
private void updateViewSize(ImageInfo imageinfo){
//this is my own implementation of changing simple-drawee-view height
// you canhave yours using imageinfo.getHeight() or imageinfo.getWidth();
simpleDraweeView.getLayoutParams().height = imageinfo.getHeight();
// don't forget to call this method. thanks to @plamenko for reminding me.
simpleDraweeView.requestLayout()
}
关于android - SimpleDraweeView 在 fresco 中缩放图像后不调整大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34874463/