I have 5 square ImageButtons that I want to have lined up side by side on the bottom of the screen. I have each one set (different id's) as:
<ImageButton
android:id="@+id/box1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:layout_weight="1"
android:layout_margin="1dp"
/>
and I have the background assigned in main java like this:
int[] imageIds = new int[] {R.id.box1,R.id.box2,R.id.box3,R.id.box4,R.id.box5};
for(int i = 0; i<5; i++){
imageButtons[i] = (ImageButton) findViewById(imageIds[i]);
imageButtons[i].setBackgroundResource(R.drawable.blank);
}
What I would like to have it do is scale the width to fit neatly side-by-side at the bottom of the screen (which it does now ok), but have the height automatically scale to match the width as well. is this possible? I don't want to use setImageSource because then it puts a border around the imagebutton.
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/layoutButtons">
<com.package.SquareButton
android:layout_height="fill_parent"
android:layout_width="0dip"
android:layout_weight="1"
<ImageView
android:id="@+id/box1"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"/>
</com.package.SquareButton>
<com.package.SquareButton
android:layout_height="fill_parent"
android:layout_width="0dip"
android:layout_weight="1"
<ImageView
android:id="@+id/box2"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"/>
</com.package.SquareButton>
.........
</LinearLayout>
And then add this custom button class:
public class SquareButton extends LinearLayout {
public SquareButton(Context context) {
super(context);
}
public SquareButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
// This is used to make square buttons.
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
}
I have had a similar headache in trying to get my buttons in a row. The solution I found was to use ImageButton and the android:src property (setImageSource in code) in combination with android:background="@null"
As I understand it the background of an image button doesn't get affected by the adjustViewBounds, it is only the imageView which you set in android:src.
The default behavior is then to give you a square button with the imageView in the middle of it. You can override that by setting the background to @null, which leaves you with only the image.
You can then use either a LinearLayout or a table to layout your buttons. I did everything in XML and used the following layout to create a row of two buttons at the bottom of the screen that scale up or down maintaining the aspect ratio with different device screens sizes. Hope this helps.
<TableLayout
android:id="@+id/tableLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dip"
android:stretchColumns="*">
<TableRow>
<ImageButton
android:id="@+id/button_one"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:layout_weight="0.5"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:onClick="clickOne"
android:background="@null"
android:src="@drawable/button_one_drawable" />
<ImageButton
android:id="@+id/button_two"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:layout_weight="0.5"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:onClick="clickTwo"
android:background="@null"
android:src="@drawable/button_two_drawable" />
</TableRow>
</TableLayout>
Instead of
android:scaleType="fitXY"
use:
android:scaleType="centerInside"
EDIT1: Try this one:
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/layoutToInflateButtons"
>
<ImageButton
android:id="@+id/box1"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:layout_weight="1"
android:layout_margin="1dp"
/>
</LinearLayout>
You can use Google's Percent Relative Layout that helps you to manage view aspect ratio.
You can use it like this
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="@+id/box1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="fitXY"
app:layout_aspectRatio="100%"
android:layout_weight="1"
/>
</android.support.percent.PercentFrameLayout>
The aspect ratio 100% will make width same as height.
example:
android:layout_width="300dp"
app:layout_aspectRatio="178%"
a width 178% of the height. This is the format the layout_aspectRatio expects
You can read it in detail here
I am sure you want to have that 5 buttons of EQUAL width/height. If this is the case then take LinearLayout and put all those 5 buttons with layout_width="0dip" and layout_weight="1"
For example:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/layoutButtons">
<ImageButton
android:id="@+id/box1"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:layout_height="wrap_content"
android:layout_width="0dip"
android:layout_weight="1"/>
<ImageButton
android:id="@+id/box2"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:layout_height="wrap_content"
android:layout_width="0dip"
android:layout_weight="1"/>
.........
</LinearLayout>
After checking Google I/O sample application from this year I've found that Google is using dimen values for specifying varios heights or widths based on the screen type. For details you can check the source code from http://code.google.com/p/iosched/.
You can specify the height of the button for exemple in values-xhdpi or values-sw720dp as:
<resources>
<dimen name="button_height">50dp</dimen>
</resources>
And then you can just use this dimen value when specifying the height:
android:layout_height="@dimen/button_height"
Set the width of the ImageButtons to fill_parent and use scaletype fitStart for the images that hug the left margin, and fitEnd for the ones on the right. Should do the trick, at least as far as your example image goes. You may have some spacing issues if the proportional width of the images exceed the screen width, but it should work for you.
ViewGroup.LayoutParams params = imageButtonName.getLayoutParams();
// Changes the height(or width) and width(or height) to the specified
params.height = layout.getWidth();
Look into making a custom ImageButton. I like this because its one class. Here is a button that adjusts its height based on the image aspect ratio. I imagine you can tweak to your needs :
public class AspectImageButton extends ImageButton {
public AspectImageButton(Context context) {
super(context);
// TODO Auto-generated constructor stub
this.getDrawable();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
Drawable d=this.getDrawable(); //grab the drawable
float fAspectRatio=(float)d.getIntrinsicWidth()/(float)d.getIntrinsicHeight();
float fHeight=(float)width/fAspectRatio;//get new height
setMeasuredDimension(width, (int)fHeight);
}
public AspectImageButton(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
public AspectImageButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
}
then in xml just use it like this:
<com.package.AspectImageButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="@drawable/home_1b"
android:background="@null"
android:scaleType="fitXY"
android:adjustViewBounds="true" />
来源：https://stackoverflow.com/questions/4656986/how-do-i-keep-the-aspect-ratio-on-image-buttons-in-android