Develop Reference

Android - Changing button height it is stretched

I have a button with an image. The height of the image should be the 20% of the height of the device. So I set the height of the image programmatically.
The problem is that, if i do it, the image becomes stretched. I put the settings that it has to be scaled centerinside and I have tried also with other elements, as imagebutton or imageview, but I had always the same problem.
How can I do?
UPDATE
This is my xml code:
<LinearLayout
android:id="#+id/letterLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:layout_marginBottom="10dp"
android:scaleType="centerCrop"
android:gravity="center"
android:layout_gravity="center"
android:onClick="onClick">
<Button
android:id="#+id/letterButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:fontFamily="sans-serif"
android:textStyle="bold"
android:padding="30dp"
android:textColor="#000000"
android:background="#00000000"
android:clickable="false"/>
</LinearLayout>
And my Java code where i set the height:
letterLayout.getLayoutParams().height = (int) (hQdr);
letterTest.getLayoutParams().height = (int) (hQdr);
//letterTest.getLayoutParams().width = (int) (wQdr);

Did you tried with the parameter android:scaleType="centerCrop"? This Crops your Image to enter in the layout

RecycleView row max height?

I would like to know if there is a max height of RecycleView rows. I created a simple RecycleView.Adapter which row layout does not fit in. It gets chopped and new row starts. I do not use fixed height or width anywhere so it should expand as much as layout requires, unless there is a maximum of row height in RecycleView? I will be able to post some code later.
For the sake of argument, I left only this code to inflate (as you can see for testing purpose I set android:layout_height="100000dp"):
<RelativeLayout
android:id="#+id/feed_photo_user_container"
android:layout_width="match_parent"
android:layout_height="100000dp"
android:background="#color/WHITE">
<com.github.siyamed.shapeimageview.CircularImageView
android:id="#+id/feed_photo_user_image"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginBottom="15dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:src="#drawable/user_icon" />
<TextView
android:id="#+id/feed_photo_user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/feed_photo_user_image"
android:layout_alignTop="#id/feed_photo_user_image"
android:layout_marginLeft="8dp"
android:layout_toEndOf="#id/feed_photo_user_image"
android:layout_toRightOf="#id/feed_photo_user_image"
android:gravity="center"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:scaleType="fitXY"
android:src="#drawable/seperator_line" />
</RelativeLayout>
And the result is the same, RecycleView somehow limits my row height.
As you can see it can expand till some maximum height

They key point was to change layout height from MACH_PARENT to wrap_content. All good now.

Text being truncated in TextView with width set to wrap_content

I'm trying to create a simple component in my layout, where there are two TextViews horizontally next to each other. The one on the right should start where the one on the left finishes. My code for this is as follows:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:singleLine="true"
android:textColor="#android:color/white"
android:textIsSelectable="false"
android:textSize="25sp" />
<TextView
android:id="#+id/text2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textColor="#android:color/white"
android:textSize="20sp" />
</LinearLayout>
I programmatically set the text on each TextView after the view has rendered. However, sometimes the text does not display correctly in the first TextView- I can see that the width has been set correctly, as the second TextView is not next to it, but the text is truncated rather than using the space. If I lock/unlock the device to refresh the screen then the text displays correctly (without the widths of the TextViews changing).
I've tried changing this to use a RelativeLayout, but I see the same issue.
Any ideas?

Although i dont understant what exactly you mean, would suggest you to use weightSum property in the parent view and android:layout_weight in child views. The same allows to put many child views inside a parent view with respect to ratio (like navigation tabs).
for eg :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="1" >
<TextView
android:id="#+id/text1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:ellipsize="end"
android:singleLine="true"
android:textColor="#android:color/white"
android:textIsSelectable="false"
android:textSize="25sp"
android:layout_weight="0.4" /> //60% width
<TextView
android:id="#+id/text2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textColor="#android:color/white"
android:textSize="20sp"
android:layout_weight="0.6" /> //40% width
</LinearLayout>
also, dont forget to put the width if child views as 0dp. as that will result in ignoring the calculations regarding the width of view. or you can set the width of child view as "match_parent" as well. any other property to width will not work. (and if you want half matchparent for both child views set layout_width to 0.5 both views.. ithink thats obvious to note)
Hopw it helps.

Space (View) is not working in ListItem Layout

I've got a ListActivity with a custom Adapter. This adapter uses the following list_item.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/item_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/ll1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/default_margin"
android:contentDescription="#string/checkbox_content_description"
android:src="#drawable/checkbox_unchecked"
android:background="#layout/transparent_background"
android:focusableInTouchMode="false"
android:adjustViewBounds="true"
android:clickable="false"
android:focusable="false" />
<TextView
android:id="#+id/tv_amount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginTop="#dimen/default_margin"
android:focusableInTouchMode="false"
android:clickable="false"
android:focusable="false"
android:textIsSelectable="false" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginTop="#dimen/default_margin">
<TextView
android:id="#+id/tv_product_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:ellipsize="end"
android:focusableInTouchMode="false"
android:clickable="false"
android:focusable="false"
android:textIsSelectable="false" />
</LinearLayout>
<TextView
android:id="#+id/tv_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginTop="#dimen/default_margin"
android:focusableInTouchMode="false"
android:clickable="false"
android:focusable="false"
android:textIsSelectable="false" />
</LinearLayout>
<LinearLayout
android:id="#+id/ll2"
android:visibility="gone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:layout_below="#id/ll1">
<Space
android:id="#+id/filler_space"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/default_margin"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginBottom="#dimen/default_margin"
android:focusableInTouchMode="false"
android:clickable="false"
android:focusable="false" />
<EditText
android:id="#+id/et_amount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginBottom="#dimen/default_margin"
android:inputType="number" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginBottom="#dimen/default_margin"
android:padding="0dp">
<AutoCompleteTextView
android:id="#+id/actv_search_product"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:singleLine="true"
android:ellipsize="end"
android:inputType="text" />
</LinearLayout>
<EditText
android:id="#+id/et_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/default_margin"
android:layout_marginBottom="#dimen/default_margin"
android:inputType="numberDecimal"
android:digits="0123456789.,-" />
</LinearLayout>
</RelativeLayout>
In the Adapter's getView-method I've added the following piece of code:
// Change the width of the Filler-Space to match the Image
// and leave the height as is
Space space = (Space) view.findViewById(R.id.filler_space);
space.setLayoutParams(new LinearLayout.LayoutParams(
imageView.getMeasuredWidth(), space.getMeasuredHeight()));
This gives the following result at first:
When I change the Visibility of my second LinearLayout (ll2) to VISIBLE, it gives the following result:
What I want instead is:
As it seems the Space-View width isn't changed at all.. While I know for fact that the getView methods are successfully called thanks to Log-messages and other things I do in the getView method.
Does anyone know what I did wrong?
PS: When I use View instead of Space I have the same result. Never used Space before, so I thought it might have to do something with that.
Solution thanks to Demand's option 4:
// Since we can't access Measured widths and heights before the View is completely loaded,
// we set up an Observer that will be called once the ListItem's layout is ready
ViewTreeObserver observer = view.getViewTreeObserver();
if(observer.isAlive()){
// In order to access the view in the onGlobalLayout, it needs to be final, so we create a final copy here
final View v = view;
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
// This will be called once the layout is finished, prior to displaying it
#Override
public void onGlobalLayout() {
ImageView imageView = (ImageView) v.findViewById(R.id.image);
Space space = (Space) v.findViewById(R.id.filler_space);
// Change the width of the Filler-Space to match the Image and leave the height as is
space.setLayoutParams(new LinearLayout.LayoutParams(imageView.getMeasuredWidth(), space.getMeasuredHeight()));
}
});
}

You set width and height if your space to wrap_content. It's mean that space will have width as their children, but there is no children and you have width = 0. It's not about space, it's about layout measuring in android.
When you call your code:
Space space = (Space) view.findViewById(R.id.filler_space);
space.setLayoutParams(new LinearLayout.LayoutParams(
imageView.getMeasuredWidth(), space.getMeasuredHeight()));
Your imageView havn't measured yet and return width = 0. It will measured later before drawing. In getView() in adapter you only create views, but measuring, layout and drawing will be later.
You have several ways to fix it:
set width of your space in dp, instead of wrap_content.
using relative layout instead of three linear layouts.
Use TableLayout.
add GlobalTreeObserver and getMeasuredWidth() at right time.
Post your runnable to view's handler to get width after drawing.
I think the best ways is 2 and 3, because 4 and 5 will cause measuring several times.

Centering the contents of a view inside a LinearLayout

Here's the layout (below). I'm trying to reposition the location of the checkbox; move it to the right of the view. android:gravity and android:layout_gravity seem to have no effect. Any explanation? This LinearLayout is a child of a Relative Layout.
<LinearLayout
android:id="#+id/deviceLinear"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_below="#id/view1" >
<ImageView
android:contentDescription="#string/devices_icon"
android:id="#+id/devices_img"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="0.15"
android:layout_gravity="center"
android:src="#drawable/hardware_phone" />
<TextView
android:id="#+id/devices"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.43"
android:text="#string/devices"
android:textSize="20sp" />
<CheckBox
android:id="#+id/check_devices"
android:button="#drawable/custom_checkbox"
android:layout_width="0dip"
android:layout_height="fill_parent"
android:layout_weight="0.42"
android:onClick="onCheckboxClicked" />
</LinearLayout>

I assume that you want the CheckBox to be on the right side of the LinearLayout. Since you have given it a layout_weight it will always take up some fixed percentage of the width regardless of its size as you can see by that blue bounding box.
Try wrapping the checkbox in another LinearLayout that has android:orientation='horizontal'. Give the 0.42 weight to the wrapping LinearLayout and then set the LinearLayout's android:gravity to be right. That should keep your spacing while moving the checkbox to the far right.
Something like this:
<LinearLayout
android:orientation="horizontal"
android:layout_width="0dp"
android:layout_weight="0.42"
android:layout_height="wrap_content"
android:gravity="right" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
You might also want to consider a RelativeLayout which enables you to position Views based on where other views are.

You are giving layout_weight="0.42" to your checkbox, that means that it will be measured with a width based on the LinearLayout's width. By this approach you will never manage to put it on the right.
The best way to achieve your goal is to use a RelativeLayout. Here is my list item layout with a checkbox on the right. Sorry about the merge tag but it is merged inside a RelativeLayout with
android:layout_width="match_parent"
android:layout_height="wrap_content"
attributes
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<ImageView android:id="#+id/imgChannelIcon"
android:layout_alignParentLeft="true"
style="?muListItemImage60x60" />
<CheckBox android:id="#+id/chkIsChecked"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_alignTop="#+id/imgChannelIcon"
android:layout_alignParentRight="true"
android:layout_alignBottom="#+id/imgChannelIcon"
android:layout_marginLeft="#dimen/list_item_checkbox_margin_left"
android:layout_marginRight="#dimen/list_item_checkbox_margin_right"
android:layout_marginTop="#dimen/list_item_checkbox_margin_top"
android:layout_marginBottom="#dimen/list_item_checkbox_margin_bottom"
android:focusable="false"
android:focusableInTouchMode="false" />
<TextView android:id="#+id/lblChannelTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_alignTop="#+id/imgChannelIcon"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:textStyle="bold"
android:text="#string/channel_item_dummy_title"
style="?muListItemTextBig" />
<TextView android:id="#+id/lblChannelSubtitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_below="#+id/lblChannelTitle"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:textStyle="normal"
android:text="#string/channel_item_dummy_subtitle"
style="?muListItemTextNormal" />
<TextView android:id="#+id/lblChannelCategory"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_toRightOf="#+id/imgChannelIcon"
android:layout_below="#+id/lblChannelSubtitle"
android:layout_alignBottom="#+id/imgChannelIcon"
android:layout_toLeftOf="#+id/chkIsChecked"
android:layout_alignWithParentIfMissing="true"
android:includeFontPadding="false"
android:paddingLeft="3dp"
android:gravity="center_vertical|left"
android:textStyle="italic"
android:text="#string/channel_item_dummy_category"
style="?muListItemTextNormal_Inverse" />
<TextView android:id="#+id/lblChannelUpdate"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_below="#+id/imgChannelIcon"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:includeFontPadding="false"
android:paddingTop="3dp"
android:paddingBottom="3dp"
android:textStyle="italic"
android:text="#string/channel_item_dummy_update"
style="?muListItemTextTiny" />
</merge>
As you can see I first place an image with layout_alignParentLeft="true" then the checkbox with layout_alignParentRight="true" and finally I arrange the other components based on those two. From your image I can see that you can use your devices_img as the left component (but you will have to give it a fixed height and maybe some margins in order to became the Layout's height) and your check box as your right.
Keep in mind that in a RelativeLayout with wrap_content as height you cannot use the AlignParentBottom attribute.
Hope this helps...