blocks|key|217509|text|我认为你想要这样的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|217510|ImageView+imgView+=+(ImageView)+findViewById(R.id.pageImage);
imgView.getLayoutParams().height+=+200;|code-block|syntax|javascript|217511|因此，首先我们从XML中获取ImageView。然后，getLayoutParams()将得到您可以编辑的参数。您可以直接在那里设置它们。宽度等也是如此。|217512|关于单元(sp，dp...)我在这里发现了一些东西。希望这能有所帮助：|217513|Use+DIP,+SP+metrics+programmatically|offset|length|217514|他们提到，所有的单位都是像素。在示例中，他设置了20sp的最小宽度，如下所示：|217515|TextView+tv0+=+new+TextView(this);
int+px+=+(int)+TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,+20,+getResources().getDisplayMetrics());
tv0.setMinimumWidth(px);|217516|附言:这是我使用的完整代码。希望这就是你想要的：|217517|package+com.example.testproject2;

import+android.os.Bundle;
import+android.app.Activity;
import+android.view.Menu;
import+android.widget.ImageView;

public+class+MainActivity+extends+Activity+{

++++@Override
++++public+void+onCreate(Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);
++++++++setContentView(R.layout.activity_main);
++++++++ImageView+imgView+=+(ImageView)+findViewById(R.id.pageImage);
++++++++imgView.getLayoutParams().height+=+500;
++++}

++++@Override
++++public+boolean+onCreateOptionsMenu(Menu+menu)+{
++++++++getMenuInflater().inflate(R.menu.activity_main,+menu);
++++++++return+true;
++++}
}|217518|entityMap|0|LINK|mutability|MUTABLE|url|http://androidactivity.wordpress.com/2011/10/04/use-dip-sp-metrics-programmatically/^0|0|0|0|0|0|10|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|18|8|@]|9|@$M|19|N|1A|1|1B]]|A|$]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1E|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

I think you want something like this:

<pre><code>ImageView imgView = (ImageView) findViewById(R.id.pageImage);
imgView.getLayoutParams().height = 200;
</code></pre>

So first we get the ImageView from the XML. Then getLayoutParams() gets you exactly the params you may edit then. You can set them directly there. The same for the width etc. 

About the unit (sp,dp...) I found something here. Hope this helps:

<a href="http://androidactivity.wordpress.com/2011/10/04/use-dip-sp-metrics-programmatically/" rel="noreferrer">Use DIP, SP metrics programmatically</a>

There they mention, that all units are pixels. In the example he sets the minimum width of 20sp like this:

<pre><code>TextView tv0 = new TextView(this);
int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 20, getResources().getDisplayMetrics());
tv0.setMinimumWidth(px);
</code></pre>

P.S. Here is the complete code I use. Hopefully this is what you want:

<pre><code>package com.example.testproject2;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ImageView;

public class MainActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 ImageView imgView = (ImageView) findViewById(R.id.pageImage);
 imgView.getLayoutParams().height = 500;
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.activity_main, menu);
 return true;
 }
}
</code></pre>

blocks|key|219746|text|你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|219747|LinearLayout.LayoutParams+layoutParams++=+new+LinearLayout.LayoutParams(width_physical_pixels,+height_physical_pixels);
imageView.setLayoutParams(layoutParams);|code-block|syntax|javascript|219748|但在参数中，它需要一个像素，因此您必须使用公式将像素转换为dp，例如，您可以使用此公式进行转换：|219749|float+scale+=+getBaseContext().getResources().getDisplayMetrics().density;++++
px+=+dp_that_you_want+*+(scale+/+160);|219750|把所有东西放在一起：|219751|//Get+screen+density+to+use+in+the+formula.
float+scale+=+getBaseContext().getResources().getDisplayMetrics().density;++++
px+=+dp_that_you_want+*+(scale+/+160);

LinearLayout.LayoutParams+layoutParams++=+new+LinearLayout.LayoutParams(px,+px);
imageView.setLayoutParams(layoutParams);|219752|我不知道这是不是你想要的，或者它是否可以工作，所以如果可以的话，请让我知道。|219753|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

You can do something like this:

<pre><code>LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(width_physical_pixels, height_physical_pixels);
imageView.setLayoutParams(layoutParams);
</code></pre>

But in the parameters it takes a pixel, so you would have to use the formula to convert pixels to dp, for example you can use this to convert: 

<pre><code>float scale = getBaseContext().getResources().getDisplayMetrics().density; 
px = dp_that_you_want * (scale / 160);
</code></pre>

Putting everything together:

<pre><code>//Get screen density to use in the formula.
float scale = getBaseContext().getResources().getDisplayMetrics().density; 
px = dp_that_you_want * (scale / 160);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(px, px);
imageView.setLayoutParams(layoutParams);
</code></pre>

I don't know if this is what you are looking for, or if it will work, so let me know if it does.

I have an ImageView in my main.xml file:

<pre><code>&lt;ImageView
 android:id="@+id/pageImage"
 android:layout_width="270dp"
 android:layout_height="45dp"
 android:layout_alignParentLeft="true"
 android:layout_alignParentTop="true"
 android:layout_marginLeft="25dp"
 android:layout_marginTop="15dp"
 android:scaleType="fitXY"
 android:src="@drawable/pageimage" /&gt;
</code></pre>

What I only need to do is to set the the <code>layout_height</code> programmatically to another value.

Additionally, I need to set the value in dp. So it is currently 45dp, I'd like to change it to another value in my main activity.

I tried to figure out how to do this using LayoutParams, but I couldn't succeed.

Thanks.

Android: Set ImageView layout_height programmatically

我的main.xml文件中有一个ImageView：<ImageView android:id="@+id/pageImage" android:layout_width="270dp" android:layout_height="45dp" ...

问Android:程序化设置ImageView layout_height
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