I followed your advice to create a MyImageView class:
public class MyImageView extends ImageView{
private static final String TAG = MyImageView.class.getSimpleName();
public MyImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
Log.d(TAG, "onMeasure: "+width+"*"+height);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int
bottom) {
super.onLayout(changed, left, top, right, bottom);
Log.d(TAG, "onLayout: "+left+" "+top+" "+right+" "+bottom);
}
}
And changed my layout to use MyImageView:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android";
xmlns:tools="http://schemas.android.com/tools";
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content">
<!-- 600*100 -->
<com.example.layouttest.MyImageView android:id="@+id/bar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="@drawable/bar"/>
<!-- 160*80 center in parent-->
<com.example.layouttest.MyImageView android:id="@+id/banner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="@drawable/banner"
android:layout_centerInParent="true"/>
<!-- 80*40 center in parent-->
<com.example.layouttest.MyImageView android:id="@+id/banner2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="@drawable/banner2"
android:layout_centerInParent="true"/>
</RelativeLayout>
</LinearLayout>
In the log file, it printed:
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 240*724
D/MyImageView(3866): onMeasure: 120*724
D/MyImageView(3866): onLayout: 0 0 480 80
D/MyImageView(3866): onLayout: 120 0 360 120
D/MyImageView(3866): onLayout: 180 30 300 90
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 480*724
D/MyImageView(3866): onMeasure: 240*724
D/MyImageView(3866): onMeasure: 120*724
D/MyImageView(3866): onLayout: 0 0 480 80
D/MyImageView(3866): onLayout: 120 0 360 120
D/MyImageView(3866): onLayout: 180 30 300 90
Could you give me more detailed instructions on how to override these two
methods and leverage the parameters to achieve what I would like to do?
To Piren:
Thank you. Assigning a specific height to the parent works.
The drawback is doing so is a little like hard code.
I would like a way to let android resize them dynamically since not all
sreen widths are the same.
lbendlin於 2013年1月26日星期六UTC+8上午3時57分31秒寫道：
> The quickest solution would be to create a custom imageview that extends
> imageview, and then handle the onLayout and onMeasure yourself.
>
> On Friday, January 25, 2013 12:59:38 AM UTC-5, Greenhand wrote:
>>
>> Because if I changed the two "inner" image views to match_parent, they
>> will expand the background imageview and its parent (RelativeLayout). It
>> did not work.
>>
>> What I would like to do is let the inner imageviews resized automatically
>> to "exactly match" the background. If it is smaller, it will stretch to the
>> height of the background. If it is bigger, it will shrink to the height of
>> the background.
>>
>> By the way, I think the "match_parent" attribute in Android is literally
>> misleading because it will make its parent bigger to "match_parent".
>> 2013/1/25 Piren <[email protected]>
>>
>>> if every imageview's height is wrap_content, why are you expecting them
>>> all to be the same (when all their sources are different sizes)?
>>> AdjustViewBounds isnt a magical property :)
>>> the two "inner" imageviews should be match_parent.
>>>
>>> it's also a good idea to define scaleType since it has the most
>>> relevancy when talking about keeping the image ratio.
>>>
>>>
>>>
>>>
>>>
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