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分享android – 设置最大宽度以使用Picasso加载图像
我的活动中有一个固定的标题,我需要动态加载图像.我需要这个图像来完全填充这个标题,保持宽度和高度的比例.
如果我之前加载图像,我会得到OutOfMemoryException.如果我使用Picasso的fit()方法,该区域将有空格.如果我像StackOverflow中的某些人建议的那样使用Transformation,我也会得到OutOfMemoryException.
我怎么解决这个问题？
标头XML：
<FrameLayout
android:id="@+id/headerContainer"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#ffd5d5d5">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView4"
android:layout_gravity="center"
android:src="@drawable/background_camera" />
<ViewFlipper
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewFlipper"
android:layout_gravity="center" >
</ViewFlipper>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Adicionar foto do estacionamento"
android:id="@+id/textAddPhotos"
android:layout_gravity="center"
android:textColor="#ff757575"
android:padding="10dp" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:id="@+id/addPhotosArea"></RelativeLayout>
</FrameLayout>
使用以下代码以编程方式将图像添加到ViewFlipper：
final ImageView imageView = new ImageView(SuggestionActivity.this);
imageView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
Picasso.with(SuggestionActivity.this).load(selectedImageUri)
.fit().centerInside()
.into(imageView);
mViewFlipper.addView(imageView);
UPDATE
当我加载exif orientation =90º的图像时,我发现Picasso误算了大小.
我正在尝试改变它的来源,但逻辑非常令人困惑.
我认为问题出在BitmapHunter.java文件的这个函数中：
static Bitmap transformResult(Request data, Bitmap result, int exifRotation) {
int inWidth = result.getWidth();
int inHeight = result.getHeight();
int drawX = 0;
int drawY = 0;
int drawWidth = inWidth;
int drawHeight = inHeight;
Matrix matrix = new Matrix();
if (data.needsMatrixTransform()) {
int targetWidth = data.targetWidth;
int targetHeight = data.targetHeight;
float targetRotation = data.rotationDegrees;
if (targetRotation != 0) {
if (data.hasRotationPivot) {
matrix.setRotate(targetRotation, data.rotationPivotX, data.rotationPivotY);
} else {
matrix.setRotate(targetRotation);
}
}
if (data.centerCrop) {
float widthRatio = targetWidth / (float) inWidth;
float heightRatio = targetHeight / (float) inHeight;
float scale;
if (widthRatio > heightRatio) {
scale = widthRatio;
int newSize = (int) Math.ceil(inHeight * (heightRatio / widthRatio));
drawY = (inHeight - newSize) / 2;
drawHeight = newSize;
} else {
scale = heightRatio;
int newSize = (int) Math.ceil(inWidth * (widthRatio / heightRatio));
drawX = (inWidth - newSize) / 2;
drawWidth = newSize;
}
matrix.preScale(scale, scale);
} else if (data.centerInside) {
float widthRatio = targetWidth / (float) inWidth;
float heightRatio = targetHeight / (float) inHeight;
float scale = widthRatio < heightRatio ? widthRatio : heightRatio;
matrix.preScale(scale, scale);
} else if (targetWidth != 0 && targetHeight != 0 //
&& (targetWidth != inWidth || targetHeight != inHeight)) {
// If an explicit target size has been specified and they do not match the results bounds,
// pre-scale the existing matrix appropriately.
float sx = targetWidth / (float) inWidth;
float sy = targetHeight / (float) inHeight;
matrix.preScale(sx, sy);
}
}
if (exifRotation != 0) {
matrix.preRotate(exifRotation);
}
Bitmap newResult =
Bitmap.createBitmap(result, drawX, drawY, drawWidth, drawHeight, matrix, true);
if (newResult != result) {
result.recycle();
result = newResult;
}
return result;
}
...全文
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weixin_38097015 2019-09-12
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使用.fit().centerCrop(),它应该做你想要的.
