blocks|key|3137994|text|(在澄清了原问题后，对答案进行了大量修改)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3137995|澄清后：|3137996|这个不能只在xml的中完成。不可能同时缩放图像和ImageView，这样图像的一个维度将始终是250dp，而ImageView将具有与图像相同的维度。|offset|length|style|BOLD|CODE|3137997|此代码将+Drawable+of+a+ImageView缩放为一个正方形，如250dp+x+250dp，其中一个维度恰好为250dp，并保持纵横比不变。然后调整ImageView的大小以匹配缩放图像的尺寸。代码在活动中使用。我通过按钮点击处理程序进行了测试。|3137998|好好享受吧。:)|3137999|private+void+scaleImage(ImageView+view)+throws+NoSuchElementException++{
++++//+Get+bitmap+from+the+the+ImageView.
++++Bitmap+bitmap+=+null;

++++try+{
++++++++Drawable+drawing+=+view.getDrawable();
++++++++bitmap+=+((BitmapDrawable)+drawing).getBitmap();
++++}+catch+(NullPointerException+e)+{
++++++++throw+new+NoSuchElementException("No+drawable+on+given+view");
++++}+catch+(ClassCastException+e)+{
++++++++//+Check+bitmap+is+Ion+drawable
++++++++bitmap+=+Ion.with(view).getBitmap();
++++}

++++//+Get+current+dimensions+AND+the+desired+bounding+box
++++int+width+=+0;

++++try+{
++++++++width+=+bitmap.getWidth();
++++}+catch+(NullPointerException+e)+{
++++++++throw+new+NoSuchElementException("Can't+find+bitmap+on+given+view/drawable");
++++}

++++int+height+=+bitmap.getHeight();
++++int+bounding+=+dpToPx(250);
++++Log.i("Test",+"original+width+=+"+%2B+Integer.toString(width));
++++Log.i("Test",+"original+height+=+"+%2B+Integer.toString(height));
++++Log.i("Test",+"bounding+=+"+%2B+Integer.toString(bounding));

++++//+Determine+how+much+to+scale:+the+dimension+requiring+less+scaling+is
++++//+closer+to+the+its+side.+This+way+the+image+always+stays+inside+your
++++//+bounding+box+AND+either+x/y+axis+touches+it.++
++++float+xScale+=+((float)+bounding)+/+width;
++++float+yScale+=+((float)+bounding)+/+height;
++++float+scale+=+(xScale+<=+yScale)+?+xScale+:+yScale;
++++Log.i("Test",+"xScale+=+"+%2B+Float.toString(xScale));
++++Log.i("Test",+"yScale+=+"+%2B+Float.toString(yScale));
++++Log.i("Test",+"scale+=+"+%2B+Float.toString(scale));

++++//+Create+a+matrix+for+the+scaling+and+add+the+scaling+data
++++Matrix+matrix+=+new+Matrix();
++++matrix.postScale(scale,+scale);

++++//+Create+a+new+bitmap+and+convert+it+to+a+format+understood+by+the+ImageView+
++++Bitmap+scaledBitmap+=+Bitmap.createBitmap(bitmap,+0,+0,+width,+height,+matrix,+true);
++++width+=+scaledBitmap.getWidth();+//+re-use
++++height+=+scaledBitmap.getHeight();+//+re-use
++++BitmapDrawable+result+=+new+BitmapDrawable(scaledBitmap);
++++Log.i("Test",+"scaled+width+=+"+%2B+Integer.toString(width));
++++Log.i("Test",+"scaled+height+=+"+%2B+Integer.toString(height));

++++//+Apply+the+scaled+bitmap
++++view.setImageDrawable(result);

++++//+Now+change+ImageView's+dimensions+to+match+the+scaled+image
++++LinearLayout.LayoutParams+params+=+(LinearLayout.LayoutParams)+view.getLayoutParams();+
++++params.width+=+width;
++++params.height+=+height;
++++view.setLayoutParams(params);

++++Log.i("Test",+"done");
}

private+int+dpToPx(int+dp)+{
++++float+density+=+getApplicationContext().getResources().getDisplayMetrics().density;
++++return+Math.round((float)dp+*+density);
}|code-block|syntax|javascript|3138000|ImageView的xml代码|3138001|<ImageView+a:id="@%2Bid/image_box"
++++a:background="#ff0000"
++++a:src="@drawable/star"
++++a:layout_width="wrap_content"
++++a:layout_height="wrap_content"
++++a:layout_marginTop="20dp"
++++a:layout_gravity="center_horizontal"/>|3138002|多亏了这篇关于缩放代码的讨论：|3138003|http://www.anddev.org/resize_and_rotate_image_-_example-t621.html|3138004|更新7,2012年11月：|3138005|添加了注释中建议的空指针检查|3138006|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2|8|O|9|1I|9|0|0|4|5|8|J|9|28|9|0|0|0|0|9|0|0|0|0|1T|0|0|0|D|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1E|8|@$F|1F|G|1G|H|I]|$F|1H|G|1I|H|J]|$F|1J|G|1K|H|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1L|8|@$F|1M|G|1N|H|I]|$F|1O|G|1P|H|J]|$F|1Q|G|1R|H|J]|$F|1S|G|1T|H|J]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1U|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1V|8|@]|9|@]|A|$R|S]]|$1|T|3|U|5|6|7|1W|8|@$F|1X|G|1Y|H|J]]|9|@]|A|$]]|$1|V|3|W|5|Q|7|1Z|8|@]|9|@]|A|$R|S]]|$1|X|3|Y|5|6|7|20|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|21|8|@]|9|@$F|22|G|23|1|24]]|A|$]]|$1|11|3|12|5|6|7|25|8|@$F|26|G|27|H|I]]|9|@]|A|$]]|$1|13|3|14|5|6|7|28|8|@]|9|@]|A|$]]|$1|15|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|16|$17|$5|18|19|1A|A|$1B|10]]]]

(The answer was heavily modified after clarifications to the original question)

After clarifications: 
This cannot be done in xml only. It is not possible to scale both the image and the <code>ImageView</code> so that image's one dimension would always be 250dp and the <code>ImageView</code> would have the same dimensions as the image.

This code scales <code>Drawable</code> of an <code>ImageView</code> to stay in a square like 250dp x 250dp with one dimension exactly 250dp and keeping the aspect ratio. Then the <code>ImageView</code> is resized to match the dimensions of the scaled image. The code is used in an activity. I tested it via button click handler.

Enjoy. :)

<pre class="lang-java prettyprint-override"><code>private void scaleImage(ImageView view) throws NoSuchElementException {
 // Get bitmap from the the ImageView.
 Bitmap bitmap = null;

 try {
 Drawable drawing = view.getDrawable();
 bitmap = ((BitmapDrawable) drawing).getBitmap();
 } catch (NullPointerException e) {
 throw new NoSuchElementException("No drawable on given view");
 } catch (ClassCastException e) {
 // Check bitmap is Ion drawable
 bitmap = Ion.with(view).getBitmap();
 }

 // Get current dimensions AND the desired bounding box
 int width = 0;

 try {
 width = bitmap.getWidth();
 } catch (NullPointerException e) {
 throw new NoSuchElementException("Can't find bitmap on given view/drawable");
 }

 int height = bitmap.getHeight();
 int bounding = dpToPx(250);
 Log.i("Test", "original width = " + Integer.toString(width));
 Log.i("Test", "original height = " + Integer.toString(height));
 Log.i("Test", "bounding = " + Integer.toString(bounding));

 // Determine how much to scale: the dimension requiring less scaling is
 // closer to the its side. This way the image always stays inside your
 // bounding box AND either x/y axis touches it. 
 float xScale = ((float) bounding) / width;
 float yScale = ((float) bounding) / height;
 float scale = (xScale &lt;= yScale) ? xScale : yScale;
 Log.i("Test", "xScale = " + Float.toString(xScale));
 Log.i("Test", "yScale = " + Float.toString(yScale));
 Log.i("Test", "scale = " + Float.toString(scale));

 // Create a matrix for the scaling and add the scaling data
 Matrix matrix = new Matrix();
 matrix.postScale(scale, scale);

 // Create a new bitmap and convert it to a format understood by the ImageView 
 Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
 width = scaledBitmap.getWidth(); // re-use
 height = scaledBitmap.getHeight(); // re-use
 BitmapDrawable result = new BitmapDrawable(scaledBitmap);
 Log.i("Test", "scaled width = " + Integer.toString(width));
 Log.i("Test", "scaled height = " + Integer.toString(height));

 // Apply the scaled bitmap
 view.setImageDrawable(result);

 // Now change ImageView's dimensions to match the scaled image
 LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams(); 
 params.width = width;
 params.height = height;
 view.setLayoutParams(params);

 Log.i("Test", "done");
}

private int dpToPx(int dp) {
 float density = getApplicationContext().getResources().getDisplayMetrics().density;
 return Math.round((float)dp * density);
}
</code></pre>

The xml code for the <code>ImageView</code>:

<pre class="lang-xml prettyprint-override"><code>&lt;ImageView a:id="@+id/image_box"
 a:background="#ff0000"
 a:src="@drawable/star"
 a:layout_width="wrap_content"
 a:layout_height="wrap_content"
 a:layout_marginTop="20dp"
 a:layout_gravity="center_horizontal"/&gt;
</code></pre>

 
Thanks to this discussion for the scaling code: 
<a href="http://www.anddev.org/resize_and_rotate_image_-_example-t621.html" rel="noreferrer">http://www.anddev.org/resize_and_rotate_image_-_example-t621.html</a> 

 
UPDATE 7th, November 2012: 
Added null pointer check as suggested in comments

blocks|key|2923890|text|尝试将android:scaleType="fitXY"添加到您的ImageView。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2923891|entityMap^0|3|P|X|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

try adding <code>android:scaleType="fitXY"</code> to your <code>ImageView</code>.

blocks|key|245223|text|可能不是这个特定问题的答案，但是如果有人，像我一样，正在寻找如何在保持宽高比的同时将图像以有限的大小(例如，maxWidth)适合于ImageView，然后摆脱ImageView占用的过多空间，那么最简单的解决方案就是在XML中使用以下属性：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|245224|++++android:scaleType="centerInside"
++++android:adjustViewBounds="true"|code-block|syntax|javascript|245225|entityMap^0|1I|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

May not be answer for this specific question, but if someone is, like me, searching for answer how to fit image in ImageView with bounded size (for example, <code>maxWidth</code>) while preserving Aspect Ratio and then get rid of excessive space occupied by ImageView, then the simplest solution is to use the following properties in XML:

<pre><code> android:scaleType="centerInside"
 android:adjustViewBounds="true"
</code></pre>

blocks|key|245227|text|<ImageView+android:layout_width="match_parent"
+++++++++++android:layout_height="wrap_content"
+++++++++++android:scaleType="centerCrop"
+++++++++++android:adjustViewBounds="true"/>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|245228|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;ImageView android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:scaleType="centerCrop"
 android:adjustViewBounds="true"/&gt;
</code></pre>

blocks|key|2923958|text|下面的代码使位图与图像视图的大小完全相同。获取位图图像的高度和宽度，然后借助imageview的参数计算新的高度和宽度。为您提供所需的图像与最佳纵横比。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2923959|int+currentBitmapWidth+=+bitMap.getWidth();
int+currentBitmapHeight+=+bitMap.getHeight();

int+ivWidth+=+imageView.getWidth();
int+ivHeight+=+imageView.getHeight();
int+newWidth+=+ivWidth;

newHeight+=+(int)+Math.floor((double)+currentBitmapHeight+*(+(double)+new_width+/+(double)+currentBitmapWidth));

Bitmap+newbitMap+=+Bitmap.createScaledBitmap(bitMap,+newWidth,+newHeight,+true);

imageView.setImageBitmap(newbitMap)|code-block|syntax|javascript|2923960|好好享受吧。|2923961|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The Below code make the bitmap perfectly with same size of the imageview. Get the bitmap image height and width and then calculate the new height and width with the help of imageview's parameters. That give you required image with best aspect ratio. 

<pre><code>int currentBitmapWidth = bitMap.getWidth();
int currentBitmapHeight = bitMap.getHeight();

int ivWidth = imageView.getWidth();
int ivHeight = imageView.getHeight();
int newWidth = ivWidth;

newHeight = (int) Math.floor((double) currentBitmapHeight *( (double) new_width / (double) currentBitmapWidth));

Bitmap newbitMap = Bitmap.createScaledBitmap(bitMap, newWidth, newHeight, true);

imageView.setImageBitmap(newbitMap)
</code></pre>

enjoy.

blocks|key|245245|text|经过一天的搜索，我认为这是最简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|245246|imageView.getLayoutParams().width+=+250;
imageView.getLayoutParams().height+=+250;
imageView.setAdjustViewBounds(true);|code-block|syntax|javascript|245247|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

After searching for a day, I think this is the easiest solution:

<pre><code>imageView.getLayoutParams().width = 250;
imageView.getLayoutParams().height = 250;
imageView.setAdjustViewBounds(true);
</code></pre>

blocks|key|3138111|text|编辑后的Jarno+Argillanders答案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3138112|如何使图像适合您的宽度和高度：|3138113|1)初始化ImageView并设置镜像：|3138114|iv+=+(ImageView)+findViewById(R.id.iv_image);
iv.setImageBitmap(image);|code-block|syntax|javascript|3138115|2)现在调整大小：|3138116|scaleImage(iv);|3138117|编辑的scaleImage方法：(可以替换预期的边界值)|CODE|3138118|private+void+scaleImage(ImageView+view)+{
++++Drawable+drawing+=+view.getDrawable();
++++if+(drawing+==+null)+{
++++++++return;
++++}
++++Bitmap+bitmap+=+((BitmapDrawable)+drawing).getBitmap();

++++int+width+=+bitmap.getWidth();
++++int+height+=+bitmap.getHeight();
++++int+xBounding+=+((View)+view.getParent()).getWidth();//EXPECTED+WIDTH
++++int+yBounding+=+((View)+view.getParent()).getHeight();//EXPECTED+HEIGHT

++++float+xScale+=+((float)+xBounding)+/+width;
++++float+yScale+=+((float)+yBounding)+/+height;

++++Matrix+matrix+=+new+Matrix();
++++matrix.postScale(xScale,+yScale);

++++Bitmap+scaledBitmap+=+Bitmap.createBitmap(bitmap,+0,+0,+width,+height,+matrix,+true);
++++width+=+scaledBitmap.getWidth();
++++height+=+scaledBitmap.getHeight();
++++BitmapDrawable+result+=+new+BitmapDrawable(context.getResources(),+scaledBitmap);

++++view.setImageDrawable(result);

++++LinearLayout.LayoutParams+params+=+(LinearLayout.LayoutParams)+view.getLayoutParams();+
++++params.width+=+width;
++++params.height+=+height;
++++view.setLayoutParams(params);
}|3138119|和.xml：|3138120|<ImageView
++++android:id="@%2Bid/iv_image"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:layout_gravity="center_horizontal"+/>|3138121|entityMap^0|4|I|0|0|0|0|0|0|3|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|17|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|18|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|19|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1A|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1B|8|@$9|1C|A|1D|B|U]]|D|@]|E|$]]|$1|V|3|W|5|L|7|1E|8|@]|D|@]|E|$M|N]]|$1|X|3|Y|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Z|3|10|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|11|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|12|$]]

Edited Jarno Argillanders answer: 
How to fit Image with your Width and Height: 
1) Initialize ImageView and set Image: 

<pre><code>iv = (ImageView) findViewById(R.id.iv_image);
iv.setImageBitmap(image);
</code></pre>

2) Now resize: 

<pre><code>scaleImage(iv);
</code></pre>

Edited <code>scaleImage</code> method: (you can replace EXPECTED bounding values) 

<pre><code>private void scaleImage(ImageView view) {
 Drawable drawing = view.getDrawable();
 if (drawing == null) {
 return;
 }
 Bitmap bitmap = ((BitmapDrawable) drawing).getBitmap();

 int width = bitmap.getWidth();
 int height = bitmap.getHeight();
 int xBounding = ((View) view.getParent()).getWidth();//EXPECTED WIDTH
 int yBounding = ((View) view.getParent()).getHeight();//EXPECTED HEIGHT

 float xScale = ((float) xBounding) / width;
 float yScale = ((float) yBounding) / height;

 Matrix matrix = new Matrix();
 matrix.postScale(xScale, yScale);

 Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
 width = scaledBitmap.getWidth();
 height = scaledBitmap.getHeight();
 BitmapDrawable result = new BitmapDrawable(context.getResources(), scaledBitmap);

 view.setImageDrawable(result);

 LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams(); 
 params.width = width;
 params.height = height;
 view.setLayoutParams(params);
}
</code></pre>

And .xml: 

<pre><code>&lt;ImageView
 android:id="@+id/iv_image"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="center_horizontal" /&gt;
</code></pre>

blocks|key|248902|text|使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|248903|<ImageView+android:id="@%2Bid/avatar"
+++++++++++android:layout_width="fill_parent"
+++++++++++android:layout_height="match_parent"
+++++++++++android:scaleType="fitXY"+/>|code-block|syntax|javascript|248904|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use this code:

<pre><code>&lt;ImageView android:id="@+id/avatar"
 android:layout_width="fill_parent"
 android:layout_height="match_parent"
 android:scaleType="fitXY" /&gt;
</code></pre>

blocks|key|250200|text|这一切都可以使用XML来完成...其他方法看起来相当复杂。无论如何，您只需在dp中将高度设置为您想要的高度，然后设置宽度以包装内容或反之亦然。使用scaleType+fitCenter调整图像的大小。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|250201|<ImageView
++++android:layout_height="200dp"
++++android:layout_width="wrap_content"
++++android:scaleType="fitCenter"
++++android:adjustViewBounds="true"
++++android:src="@mipmap/ic_launcher"
++++android:layout_below="@%2Bid/title"
++++android:layout_margin="5dip"
++++android:id="@%2Bid/imageView1">|code-block|syntax|javascript|250202|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

this can all be done using XML... the other methods seem pretty complicated.
Anyway, you just set the height to what ever you want in dp, then set the width to wrap content or visa versa. Use scaleType fitCenter to adjust the size of the image.

<pre><code>&lt;ImageView
 android:layout_height="200dp"
 android:layout_width="wrap_content"
 android:scaleType="fitCenter"
 android:adjustViewBounds="true"
 android:src="@mipmap/ic_launcher"
 android:layout_below="@+id/title"
 android:layout_margin="5dip"
 android:id="@+id/imageView1"&gt;
</code></pre>

blocks|key|245292|text|这对我的案子来说就够了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|245293|+++++++++++++<ImageView
++++++++++++++++android:layout_width="match_parent"
++++++++++++++++android:layout_height="wrap_content"
++++++++++++++++android:layout_centerHorizontal="true"
++++++++++++++++android:scaleType="centerCrop"
++++++++++++++++android:adjustViewBounds="true"
++++++++++++++++/>|code-block|syntax|javascript|245294|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This did it for my case.

<pre><code> &lt;ImageView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:scaleType="centerCrop"
 android:adjustViewBounds="true"
 /&gt;
</code></pre>

blocks|key|245305|text|我需要在毕加索的约束布局中完成这一点，所以我把上面的一些答案整合在一起，提出了这个解决方案(我已经知道我正在加载的图像的纵横比，所以这很有帮助)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|245306|在setContentView(...)之后的某个地方，调用了我的活动代码|offset|length|style|BOLD|245307|protected+void+setBoxshotBackgroundImage()+{
++++ImageView+backgroundImageView+=+(ImageView)+findViewById(R.id.background_image_view);

++++if(backgroundImageView+!=+null)+{
++++++++DisplayMetrics+displayMetrics+=+new+DisplayMetrics();
++++++++getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
++++++++int+width+=+displayMetrics.widthPixels;
++++++++int+height+=+(int)+Math.round(width+*+ImageLoader.BOXART_HEIGHT_ASPECT_RATIO);

++++++++//+we+adjust+the+height+of+this+element,+as+the+width+is+already+pinned+to+the+parent+in+xml
++++++++backgroundImageView.getLayoutParams().height+=+height;

++++++++//+implement+your+Picasso+loading+code+here
++++}+else+{
++++++++//+fallback+if+no+element+in+layout...
++++}
}|code-block|syntax|javascript|245308|我的XML中的|245309|<?xml+version="1.0"+encoding="utf-8"?>

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="0dp">

++++<ImageView
++++++++android:id="@%2Bid/background_image_view"
++++++++android:layout_width="0dp"
++++++++android:layout_height="0dp"
++++++++android:scaleType="fitStart"
++++++++app:srcCompat="@color/background"
++++++++android:adjustViewBounds="true"
++++++++tools:layout_editor_absoluteY="0dp"
++++++++android:layout_marginTop="0dp"
++++++++android:layout_marginBottom="0dp"
++++++++android:layout_marginRight="0dp"
++++++++android:layout_marginLeft="0dp"
++++++++app:layout_constraintRight_toRightOf="parent"
++++++++app:layout_constraintLeft_toLeftOf="parent"
++++++++app:layout_constraintTop_toTopOf="parent"/>

++++

</android.support.constraint.ConstraintLayout>|245310|请注意，其中缺少constraintBottom_toBottomOf属性。ImageLoader是我自己的静态类，用于加载图像的util方法和常量。|245311|entityMap^0|0|S|9|0|0|0|5|0|0|0|23|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

I needed to get this done in a constraint layout with Picasso, so I munged together some of the above answers and came up with this solution (I already know the aspect ratio of the image I'm loading, so that helps):

Called in my activity code somewhere after setContentView(...)

<pre><code>protected void setBoxshotBackgroundImage() {
 ImageView backgroundImageView = (ImageView) findViewById(R.id.background_image_view);

 if(backgroundImageView != null) {
 DisplayMetrics displayMetrics = new DisplayMetrics();
 getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
 int width = displayMetrics.widthPixels;
 int height = (int) Math.round(width * ImageLoader.BOXART_HEIGHT_ASPECT_RATIO);

 // we adjust the height of this element, as the width is already pinned to the parent in xml
 backgroundImageView.getLayoutParams().height = height;

 // implement your Picasso loading code here
 } else {
 // fallback if no element in layout...
 }
}
</code></pre>

In my XML

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;

&lt;android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="0dp"&gt;

 &lt;ImageView
 android:id="@+id/background_image_view"
 android:layout_width="0dp"
 android:layout_height="0dp"
 android:scaleType="fitStart"
 app:srcCompat="@color/background"
 android:adjustViewBounds="true"
 tools:layout_editor_absoluteY="0dp"
 android:layout_marginTop="0dp"
 android:layout_marginBottom="0dp"
 android:layout_marginRight="0dp"
 android:layout_marginLeft="0dp"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintTop_toTopOf="parent"/&gt;

 &lt;!-- other elements of this layout here... --&gt;

&lt;/android.support.constraint.ConstraintLayout&gt;
</code></pre>

Note the lack of a constraintBottom_toBottomOf attribute. ImageLoader is my own static class for image loading util methods and constants.

blocks|key|250239|text|我需要一个ImageView和一个位图，以便将位图缩放为ImageView大小，并且ImageView的大小与缩放后的位图相同:)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|250240|我一直在看这篇文章，想知道怎么做，最后做了我想做的事情，虽然不是这里描述的方式。|250241|<FrameLayout+xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@%2Bid/acpt_frag_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/imageBackground"
android:orientation="vertical">

<ImageView
++++android:id="@%2Bid/acpt_image"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:layout_gravity="center"
++++android:adjustViewBounds="true"
++++android:layout_margin="@dimen/document_editor_image_margin"
++++android:background="@color/imageBackground"
++++android:elevation="@dimen/document_image_elevation"+/>|code-block|syntax|javascript|250242|​|250243|然后在onCreateView方法中|250244|@Nullable
@Override
public+View+onCreateView(LayoutInflater+inflater,+@Nullable+ViewGroup+container,+@Nullable+Bundle+savedInstanceState)+{

++++View+view+=+inflater.inflate(R.layout.fragment_scanner_acpt,+null);

++++progress+=+view.findViewById(R.id.progress);

++++imageView+=+view.findViewById(R.id.acpt_image);
++++imageView.setImageBitmap(+bitmap+);

++++imageView.getViewTreeObserver().addOnGlobalLayoutListener(()->
++++++++layoutImageView()
++++);

++++return+view;
}|250245|然后是layoutImageView()代码|250246|private+void+layoutImageView(){

++++float[]+matrixv+=+new+float[+9+];

++++imageView.getImageMatrix().getValues(matrixv);

++++int+w+=+(int)+(+matrixv[Matrix.MSCALE_X]+*+bitmap.getWidth()+);
++++int+h+=+(int)+(+matrixv[Matrix.MSCALE_Y]+*+bitmap.getHeight()+);

++++imageView.setMaxHeight(h);
++++imageView.setMaxWidth(w);

}|250247|结果是图像完美地适合内部，保持纵横比，并且当位图在内部时不会有来自ImageView的额外剩余像素。|250248|Result|offset|length|250249|重要的是让wrap_content和adjustViewBounds为true，然后setMaxWidth和setMaxHeight就可以工作了，这是在ImageView的源代码中编写的。|250250|/*An+optional+argument+to+supply+a+maximum+height+for+this+view.+Only+valid+if
+*+{@link+#setAdjustViewBounds(boolean)}+has+been+set+to+true.+To+set+an+image+to+be+a
+*+maximum+of+100+x+100+while+preserving+the+original+aspect+ratio,+do+the+following:+1)+set
+*+adjustViewBounds+to+true+2)+set+maxWidth+and+maxHeight+to+100+3)+set+the+height+and+width
+*+layout+params+to+WRAP_CONTENT.+*/|250251|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/X9VZO.jpg^0|0|0|0|0|0|0|0|0|0|0|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|1F|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|1H|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|1I|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1J|8|@]|9|@$W|1K|X|1L|1|1M]]|A|$]]|$1|Y|3|Z|5|6|7|1N|8|@]|9|@]|A|$]]|$1|10|3|11|5|F|7|1O|8|@]|9|@]|A|$G|H]]|$1|12|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

I needed to have an ImageView and an Bitmap, so the Bitmap is scaled to ImageView size, and size of the ImageView is the same of the scaled Bitmap :).

I was looking through this post for how to do it, and finally did what I want, not the way described here though.

<pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/acpt_frag_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/imageBackground"
android:orientation="vertical"&gt;

&lt;ImageView
 android:id="@+id/acpt_image"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:adjustViewBounds="true"
 android:layout_margin="@dimen/document_editor_image_margin"
 android:background="@color/imageBackground"
 android:elevation="@dimen/document_image_elevation" /&gt;
</code></pre>



and then in onCreateView method

<pre><code>@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

 View view = inflater.inflate(R.layout.fragment_scanner_acpt, null);

 progress = view.findViewById(R.id.progress);

 imageView = view.findViewById(R.id.acpt_image);
 imageView.setImageBitmap( bitmap );

 imageView.getViewTreeObserver().addOnGlobalLayoutListener(()-&gt;
 layoutImageView()
 );

 return view;
}
</code></pre>

and then layoutImageView() code

<pre><code>private void layoutImageView(){

 float[] matrixv = new float[ 9 ];

 imageView.getImageMatrix().getValues(matrixv);

 int w = (int) ( matrixv[Matrix.MSCALE_X] * bitmap.getWidth() );
 int h = (int) ( matrixv[Matrix.MSCALE_Y] * bitmap.getHeight() );

 imageView.setMaxHeight(h);
 imageView.setMaxWidth(w);

}
</code></pre>

And the result is that image fits inside perfectly, keeping aspect ratio,
and doesn't have extra leftover pixels from ImageView when the Bitmap is inside.

<a href="https://i.stack.imgur.com/X9VZO.jpg" rel="nofollow noreferrer">Result</a>

It's important ImageView to have 
wrap_content and adjustViewBounds to true,
then setMaxWidth and setMaxHeight will work, this is written in the source code of ImageView, 

<pre><code>/*An optional argument to supply a maximum height for this view. Only valid if
 * {@link #setAdjustViewBounds(boolean)} has been set to true. To set an image to be a
 * maximum of 100 x 100 while preserving the original aspect ratio, do the following: 1) set
 * adjustViewBounds to true 2) set maxWidth and maxHeight to 100 3) set the height and width
 * layout params to WRAP_CONTENT. */
</code></pre>

blocks|key|250253|text|在大多数情况下有效的最佳解决方案是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|250254|下面是一个示例：|250255|<ImageView+android:id="@%2Bid/avatar"
+++++++++++android:layout_width="match_parent"
+++++++++++android:layout_height="match_parent"
+++++++++++android:scaleType="fitXY"/>|code-block|syntax|javascript|250256|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The Best solution that works in most cases is

Here is an example:

<pre><code>&lt;ImageView android:id="@+id/avatar"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:scaleType="fitXY"/&gt;
</code></pre>

blocks|key|3138290|text|我使用的是一个非常简单的解决方案。下面是我的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3138291|imageView.setLayoutParams(new+LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.getLayoutParams().height+=+imageView.getLayoutParams().width;
imageView.setMinimumHeight(imageView.getLayoutParams().width);|code-block|syntax|javascript|3138292|我的图片是在网格视图中动态添加的。当您对imageview进行这些设置时，图片会自动以1:1的比例显示。|3138293|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I am using a very simple solution. Here my code:

<pre><code>imageView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.getLayoutParams().height = imageView.getLayoutParams().width;
imageView.setMinimumHeight(imageView.getLayoutParams().width);
</code></pre>

My pictures are added dynamically in a gridview. When you make these settings to the imageview, the picture can be automatically displayed in 1:1 ratio.

blocks|key|2924192|text|使用简单的数学运算来调整图像的大小。您可以调整ImageView的大小，也可以调整可绘制图像的大小而不是在ImageView上设置的大小。找到要在ImageView上设置的位图的宽度和高度，并调用所需的方法。假设宽度500大于高度大于调用方法|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2924193|//250+is+the+width+you+want+after+resize+bitmap
Bitmat+bmp+=+BitmapScaler.scaleToFitWidth(bitmap,+250)+;
ImageView+image+=+(ImageView)+findViewById(R.id.picture);
image.setImageBitmap(bmp);|code-block|syntax|javascript|2924194|用于调整位图大小的。|BOLD|2924195|public+class+BitmapScaler{
//+Scale+and+maintain+aspect+ratio+given+a+desired+width
//+BitmapScaler.scaleToFitWidth(bitmap,+100);
+public+static+Bitmap+scaleToFitWidth(Bitmap+b,+int+width)
++{
++++float+factor+=+width+/+(float)+b.getWidth();
++++return+Bitmap.createScaledBitmap(b,+width,+(int)+(b.getHeight()+*+factor),+true);
++}


++//+Scale+and+maintain+aspect+ratio+given+a+desired+height
++//+BitmapScaler.scaleToFitHeight(bitmap,+100);
++public+static+Bitmap+scaleToFitHeight(Bitmap+b,+int+height)
++{
++++float+factor+=+height+/+(float)+b.getHeight();
++++return+Bitmap.createScaledBitmap(b,+(int)+(b.getWidth()+*+factor),+height,+true);
+++}
+}|2924196|xml代码是|2924197|<ImageView
android:id="@%2Bid/picture"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:adjustViewBounds="true"
android:scaleType="fitcenter"+/>|2924198|entityMap^0|N|9|1H|9|21|9|0|0|9|1|0|0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|M]]|D|@]|E|$]]|$1|N|3|O|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|P|3|Q|5|6|7|17|8|@$9|18|A|19|B|M]]|D|@]|E|$]]|$1|R|3|S|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|T|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|U|$]]

Use Simple math to resize the image . either you can resize <code>ImageView</code> or you can resize drawable image than set on <code>ImageView</code> . find the width and height of your bitmap which you want to set on <code>ImageView</code> and call the desired method. suppose your width 500 is greater than height than call method 

<pre><code>//250 is the width you want after resize bitmap
Bitmat bmp = BitmapScaler.scaleToFitWidth(bitmap, 250) ;
ImageView image = (ImageView) findViewById(R.id.picture);
image.setImageBitmap(bmp);
</code></pre>

You use this class for resize bitmap.

<pre><code>public class BitmapScaler{
// Scale and maintain aspect ratio given a desired width
// BitmapScaler.scaleToFitWidth(bitmap, 100);
 public static Bitmap scaleToFitWidth(Bitmap b, int width)
 {
 float factor = width / (float) b.getWidth();
 return Bitmap.createScaledBitmap(b, width, (int) (b.getHeight() * factor), true);
 }


 // Scale and maintain aspect ratio given a desired height
 // BitmapScaler.scaleToFitHeight(bitmap, 100);
 public static Bitmap scaleToFitHeight(Bitmap b, int height)
 {
 float factor = height / (float) b.getHeight();
 return Bitmap.createScaledBitmap(b, (int) (b.getWidth() * factor), height, true);
 }
 }
</code></pre>

xml code is

<pre><code>&lt;ImageView
android:id="@+id/picture"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:adjustViewBounds="true"
android:scaleType="fitcenter" /&gt;
</code></pre>

blocks|key|2924242|text|如果对你不起作用，那么用android:src替换android:background|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2924243|android:src将玩大把戏|2924244|++++<ImageView
++++android:layout_width="match_parent"
++++android:layout_height="wrap_content"
++++android:adjustViewBounds="true"
++++android:scaleType="fitCenter"
++++android:src="@drawable/bg_hc"+/>|code-block|syntax|javascript|2924245|它就像一个护身符一样工作得很好|2924246|​|2924247|📷|atomic|offset|length|2924248|2924249|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a198f0a8d08babccfa5b2f0a666bda87.png|imageAlt^0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

if it's not working for you then replace android:background with android:src

android:src will play the major trick

<pre><code> &lt;ImageView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:adjustViewBounds="true"
 android:scaleType="fitCenter"
 android:src="@drawable/bg_hc" /&gt;
</code></pre>

it's working fine like a charm

<a href="https://i.stack.imgur.com/w38vF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/w38vF.png" alt="enter image description here"></a>

blocks|key|2924251|text|快速回答：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2924252|<ImageView
++++++++android:id="@%2Bid/imageView"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:scaleType="center"
++++++++android:src="@drawable/yourImage"
++++++++app:layout_constraintBottom_toBottomOf="parent"
++++++++app:layout_constraintEnd_toEndOf="parent"
++++++++app:layout_constraintStart_toStartOf="parent"
++++++++app:layout_constraintTop_toTopOf="parent"+/>|code-block|syntax|javascript|2924253|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Quick answer:

<pre><code>&lt;ImageView
 android:id="@+id/imageView"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:scaleType="center"
 android:src="@drawable/yourImage"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" /&gt;
</code></pre>

How to fit an image of random size to an <code>ImageView</code>? 
When:

<ul>
<li>Initially <code>ImageView</code> dimensions are 250dp * 250dp</li>
<li>The image's larger dimension should be scaled up/down to 250dp</li>
<li>The image should keep its aspect ratio</li>
<li>The <code>ImageView</code> dimensions should match scaled image's dimensions after scaling</li>
</ul>

E.g. for an image of 100*150, the image and the <code>ImageView</code> should be 166*250. 
E.g. for an image of 150*100, the image and the <code>ImageView</code> should be 250*166. 

If I set the bounds as

<pre><code>&lt;ImageView
 android:id="@+id/picture"
 android:layout_width="250dp"
 android:layout_height="250dp"
 android:layout_gravity="center_horizontal"
 android:layout_marginTop="20dp"
 android:adjustViewBounds="true" /&gt;
</code></pre>

images fit properly in the <code>ImageView</code>, but the <code>ImageView</code> is always 250dp * 250dp.

Fit image into ImageView, keep aspect ratio and then resize ImageView to image dimensions?

如何使任意大小的图像适合ImageView在以下情况下：初始尺寸为250dp *250dp图像的较大尺寸应放大/缩小至250dp图像应保持其纵横比缩放后<代码>D10</code>尺寸应与缩放后的图像尺寸匹配例如，对于100*150的图像，图像和ImageView应为166*250。例如，对于150*100的图像，图像...

问将图像放入ImageView，保持纵横比，然后调整ImageView大小以适应图像尺寸？
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问将图像放入ImageView，保持纵横比，然后调整ImageView大小以适应图像尺寸？
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