blocks|key|41028|text|public+class+GETImageView+extends+ImageView+{

public+GETImageView+(Context+context,+AttributeSet+attrs)+{
++++super(context,+attrs);
}

@Override
protected+void+onMeasure(int+widthMeasureSpec,+int+heightMeasureSpec)+{
++++Drawable+d+=+getDrawable();

++++if+(d+!=+null)+{
++++++++int+width+=+MeasureSpec.getSize(widthMeasureSpec);
++++}
++++super.onMeasure(widthMeasureSpec,+heightMeasureSpec);
}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|41029|ImageView尚未绘制图像，因此不返回宽度或高度。你可以使用一个子类来获得图像视图的宽度。|unstyled|41030|这里有一些链接为您提供了另一种简单方法：|41031|How+to+get+the+width+and+height+of+an+android.widget.ImageView?|offset|length|41032|How+to+get+the+width+and+height+of+an+Image+View+in+android?|41033|Android+ImageView+return+getWidth,+getHeight+zero|41034|希望这能对你有所帮助。|41035|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4680499/android-get-height-width-of-imageview|1|https://stackoverflow.com/questions/10411975/how-to-get-the-width-and-height-of-an-image-view-in-android|2|https://stackoverflow.com/questions/14029513/android-imageview-return-getwidth-getheight-zero^0|0|0|0|0|1R|0|0|0|1O|1|0|0|1D|2|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|15|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|17|8|@]|9|@$K|18|L|19|1|1A]]|A|$]]|$1|M|3|N|5|F|7|1B|8|@]|9|@$K|1C|L|1D|1|1E]]|A|$]]|$1|O|3|P|5|F|7|1F|8|@]|9|@$K|1G|L|1H|1|1I]]|A|$]]|$1|Q|3|R|5|F|7|1J|8|@]|9|@]|A|$]]|$1|S|3|-4|5|F|7|1K|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]|12|$5|V|W|X|A|$Y|13]]]]

<pre><code>public class GETImageView extends ImageView {

public GETImageView (Context context, AttributeSet attrs) {
 super(context, attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 Drawable d = getDrawable();

 if (d != null) {
 int width = MeasureSpec.getSize(widthMeasureSpec);
 }
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
</code></pre>

The ImageView have not yet draw the image, so no width or height return.
You may use a subclass to get the imageview width.

Here is some link provide you another easy methods:

<a href="https://stackoverflow.com/questions/4680499/android-get-height-width-of-imageview">How to get the width and height of an android.widget.ImageView?</a>

<a href="https://stackoverflow.com/questions/10411975/how-to-get-the-width-and-height-of-an-image-view-in-android">How to get the width and height of an Image View in android?</a>

<a href="https://stackoverflow.com/questions/14029513/android-imageview-return-getwidth-getheight-zero">Android ImageView return getWidth, getHeight zero</a>

Hope this help you.

blocks|key|257868|text|顺便说一句，在采取度量步骤之前，视图不会调整大小。请参阅此链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|257869|getWidth()+and+getHeight()+of+View+returns+0|offset|length|257870|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3591784/android-get-width-returns-0^0|0|0|18|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

By the way, views don't get sized until the measurement steps have been taken. See this link:

<a href="https://stackoverflow.com/questions/3591784/android-get-width-returns-0">getWidth() and getHeight() of View returns 0</a>

blocks|key|41099|text|您可以对ImageView+image1使用OnGlobalLayoutListener，这样就可以获得layout...as中视图所占用的确切宽度和高度|type|unstyled|depth|inlineStyleRanges|entityRanges|data|41100|image1+=+(ImageView)+findViewById(R.id.ImageView01);
++++++++ViewTreeObserver+viewTreeObserver+=+image1.getViewTreeObserver();
++++++++viewTreeObserver
++++++++++++++++.addOnGlobalLayoutListener(new+OnGlobalLayoutListener()+{
++++++++++++++++++++@Override
++++++++++++++++++++public+void+onGlobalLayout()+{
++++++++++++++++++++++++if+(isFirstImage)+{
++++++++++++++++++++++++++++applyRotation(0,+90);
++++++++++++++++++++++++++++isFirstImage+=+!isFirstImage;
++++++++++++++++++++++++}+
++++++++++++++++++++++++if+(android.os.Build.VERSION.SDK_INT+>=+android.os.Build.VERSION_CODES.JELLY_BEAN)
++++++++++++++++++++++++++++image1.getViewTreeObserver()
++++++++++++++++++++++++++++++++++++.removeOnGlobalLayoutListener(this);
++++++++++++++++++++++++else
++++++++++++++++++++++++++++image1.getViewTreeObserver()
++++++++++++++++++++++++++++++++++++.removeGlobalOnLayoutListener(this);
++++++++++++++++++++}
++++++++++++++++});|code-block|syntax|javascript|41101|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|$]]

you can use OnGlobalLayoutListener for the ImageView image1 so you can get exact width and height occupied by the view in the layout...as

<pre><code>image1 = (ImageView) findViewById(R.id.ImageView01);
 ViewTreeObserver viewTreeObserver = image1.getViewTreeObserver();
 viewTreeObserver
 .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
 @Override
 public void onGlobalLayout() {
 if (isFirstImage) {
 applyRotation(0, 90);
 isFirstImage = !isFirstImage;
 } 
 if (android.os.Build.VERSION.SDK_INT &gt;= android.os.Build.VERSION_CODES.JELLY_BEAN)
 image1.getViewTreeObserver()
 .removeOnGlobalLayoutListener(this);
 else
 image1.getViewTreeObserver()
 .removeGlobalOnLayoutListener(this);
 }
 });
</code></pre>

blocks|key|41116|text|您应该使用：image1.getLayoutParams().width;|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|41117|entityMap^0|6|V|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You should use: <code>image1.getLayoutParams().width;</code>

blocks|key|41158|text|也许你应该先调用View.measure(int，int)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|41159|因为宽度和高度只有在绘制此视图时才会定义。你可以手动调用measure来强制这个视图来计算它的大小；|41160|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Maybe you should call View.measure(int,int) first. 
Since the width and height is not defined until this view is draw. You can call measure by hand to enforce this view to calculate it's size;

I have looked at the similar questions and tried their solutions, but it didn't work for me. I'm trying to read <code>width</code> of an <code>imageView</code>, but it is returning <code>0</code>. Here is the code:
<pre><code>public class MainActivity extends Activity {
private ImageView image1; 
float centerX,centerY;
private ImageView image2;
private boolean isFirstImage = true;

@Override
public void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);
 setContentView(R.layout.rotate);
 image1 = (ImageView) findViewById(R.id.ImageView01);
 image2 = (ImageView) findViewById(R.id.ImageView02);
 image2.setVisibility(View.GONE);

 if (isFirstImage) {
 applyRotation(0, 90);
 isFirstImage = !isFirstImage;
 } 
} 

private void applyRotation(float start, float end) {

 centerX=image1.getWidth()/2.0f;
 centerY=image1.getHeight()/2.0f;
 final Flip3dAnimation rotation =

 new Flip3dAnimation(start, end,centerX , centerY);
 rotation.setDuration(500);
 rotation.setFillAfter(true);
 rotation.setInterpolator(new AccelerateInterpolator());
 rotation.setAnimationListener(new DisplayNextView(isFirstImage, image1,
 image2));

 if (isFirstImage)
 {
 image1.startAnimation(rotation);
 } else {
 image2.startAnimation(rotation);
 }
}
}
</code></pre>
Can anyone help me with this? Thanks

View's getWidth() and getHeight() returning 0

我看过类似的问题，并尝试了他们的解决方案，但这对我来说不起作用。我正在尝试读取imageView的width，但它返回0。代码如下：public class MainActivity extends Activity {private ImageView image1;   float centerX,centerY;...

问视图的getWidth()和getHeight()返回0
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