Develop Reference

RelativeLayout doesn't wrap_content on width on Android 6

I have 2 devices: Asus Zenfone 2 (6.0.1) and Galaxy Note 3 (5.0)
In my app I take photo and on the next screen I show it on ImageView and add some information on it. Here is xml layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true"
android:background="#android:color/black">
<LinearLayout
android:id="#+id/preview_buttons"
android:orientation="horizontal"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="visible"
android:background="#android:color/black">
<TextView
android:id="#+id/tv_cancel"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textColor="#android:color/white"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:textSize="16sp"
android:text="CANCEL"/>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:background="#android:color/darker_gray"/>
<TextView
android:id="#+id/tv_accept"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textColor="#android:color/white"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:textSize="16sp"
android:text="ACCEPT"/>
</LinearLayout>
<RelativeLayout
android:id="#+id/preview_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:background="#android:color/holo_blue_bright"
android:layout_above="#id/preview_buttons">
<ImageView
android:id="#+id/image_preview"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
/>
<TextView
android:id="#+id/preview_top_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingRight="16dp"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:layout_alignRight="#id/image_preview"
android:layout_alignTop="#id/image_preview"
android:gravity="right"
android:background="#drawable/top_text_background"
android:textSize="16sp"
android:textColor="#android:color/white"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginBottom="8dp"
android:layout_alignLeft="#id/image_preview"
android:layout_alignBottom="#id/image_preview"
android:src="#drawable/ic_verified_grey600"/>
<TextView
android:id="#+id/preview_bottom_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingRight="16dp"
android:paddingBottom="8dp"
android:paddingTop="8dp"
android:layout_alignRight="#id/image_preview"
android:layout_alignBottom="#id/image_preview"
android:gravity="right"
android:background="#drawable/bottom_text_background"
android:textSize="16sp"
android:textColor="#android:color/white"/>
</RelativeLayout>
</RelativeLayout>
UPD. I have problem with RelativeLayout "preview_container"
From this layout I expect its width would wrap, if ImageView's width doesn't fill whole screen and be on the screen center. And it works nice on GN3, but on my AZ2 I get space at right side (No reputation to insert image, it's here http://i.imgur.com/cSujbAp.png)
UPD2. What I expect: RelativeLayout wraped correctly, so I don't see background. Example from my GN3 here (http://i.imgur.com/vKGQq8r.jpg). Transparent background also can't help because after that I need to get drawing cache of this layout and work with it
I know about alignParent issue, but I don't use it now and my extra views placed correct.
Please help me, what's wrong?

<ImageView
android:id="#+id/image_preview"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
/>
android:layout_height="match_parent" should not be match_parent.

Your preview_top_text has the width set to match_parent so it means that, since her container is the same of the image, it will stretch way to contain also the textview and not only the imageview.
Add the android:layout_centerHorizontal="true" parameter to the imageview and it should be centered.
Hope it helped
UPDATE POINT 2
two possibilities:
change the sizes of the TextViews to wrap_content
change the background of the second relativelayout to transparent

Is it possible to have a view's height react to the size of another view dynamically?

I have a TextView that has a height of wrap_content.On the top and the bottom is a TextView line. I was wondering if there is anyway to have the lines resize based on the height determined by the text wrap. See Image below.
Note: The background of the TextView is transparent. so I cannot just draw the line through and use a FrameLayout.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="#dimen/margin_connection_line"
android:layout_marginBottom="#dimen/margin_connection_line"
>
<View
android:id="#+id/top_vertical_line"
android:layout_above="#+id/connection_text"
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#color/font_white"
/>
<TextView
android:id="#+id/connection_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/margin_larger"
android:layout_marginRight="#dimen/margin_larger"
android:layout_gravity="center"
android:padding="#dimen/margin_larger"
android:gravity="center"
android:textColor="#color/font_white"
android:background="#drawable/connection_white_border"
android:text="#string/sample_text"
/>
<View
android:id="#+id/bottom_vertical_line"
android:layout_below="#+id/connection_text"
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#color/font_white"
/>
</RelativeLayout>

I don't really understand if the two lines are TextViews or just Views.
Anyway you should use a simple RelativeLayout. This is to have two lines with 10dp width.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
<View
android:layout_width="10dp"
android:layout_height="match_parent"
android:layout_above="#+id/textView"
android:layout_centerHorizontal="true" />
<View
android:layout_width="10dp"
android:layout_height="match_parent"
android:layout_below="#+id/textView"
android:layout_centerHorizontal="true" />

Android ListFragment: background under each item

I'd like to create a ListFragment in Android, and a background for each element, like this:
I'll want to set the width of theese background's from the code of my ListAdapter. I thought to create the list element's layout something like this:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="40dp"
android:id="#+id/surveyListRow_upperLayout"
android:layout_marginTop="7dp"
android:layout_marginBottom="7dp">
<RelativeLayout
android:layout_marginLeft="23dp"
android:layout_width="40dp"
android:layout_height="40dp"
android:id="#+id/surveyListRow_ringLayout"
android:background="#FFFFFF"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="#color/textColor"
android:gravity="center"
android:id="#+id/surveyListRow_surveyName"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_marginLeft="55dp"
android:layout_marginRight="105dp"/>
<TextView
android:layout_width="80dp"
android:layout_height="match_parent"
android:textSize="18sp"
android:gravity="center"
android:id="#+id/surveyListRow_surveyPrize"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minHeight="57dp"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:layout_weight="30"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="70"/>
</LinearLayout>
</RelativeLayout>
And I'll set the weight property of the LinearLayout's children, to set the background width.
My problem is, when the text in the width is too long (as you can see in the third element). Then the background isn't scales to the bottom of the element.
Can you help me, why? I've tried almost everything I can imagine.
Thanks!

Try to add this to your TextView
<TextView
...
android:ellipsize="end"
android:ems="2"
android:maxLines="2" />
This don't let your textview has more than two lines and put an ellipsis on the end.
Maybe this would be a solution.

Custom dialog height to match content

This is my custom dialog, there are some textboxs and two buttons.
I'm using a RelativeLayout on it.
I'd like the dialog size to match the content, not all that blank space under there.
I don't want to use explicit pixel heights (it's not good practice).
Another thing, there's a way to have some space between every view?
This is my XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/txt_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="8pt"
android:textStyle="italic" />
<TextView
android:id="#+id/txt_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_below="#+id/txt_desc"
android:textSize="8pt" />
<TextView
android:id="#+id/txt_place"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_below="#+id/txt_date"
android:textSize="8pt" />
<Button
android:id="#+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/txt_place"
android:layout_toRightOf="#+id/view"
android:text="#string/btn_close" />
<View
android:id="#+id/view"
android:layout_width="0dp"
android:layout_height="1dp"
android:layout_centerHorizontal="true" />
<Button
android:id="#+id/btn_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/txt_place"
android:layout_toLeftOf="#+id/view"
android:drawableLeft="#android:drawable/ic_menu_edit"
android:text="#string/btn_edit" />
</RelativeLayout>

First question
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
Second question
Plus use android:marginTop="5dp" if you want to separate a View from Top for 5 dp.
marginLeft|Right|Bottom are also available.
<TextView
android:id="#+id/txt_place"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp" <-----------------
android:layout_below="#+id/txt_date"
android:textSize="8pt" />
By the way, if I were you, I'd nest some layouts to make order. You can have a general Relative Layout, then 2 linear layouts: one horizontal for TextViews and one vertical for Buttons. You can definely play with your editor and try to make the best appearance for your dialog.
EDIT
Try this one:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000"
android:orientation="vertical"
android:paddingBottom="50dp" >
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/txt_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="prova"
android:textSize="8pt"
android:textStyle="italic" />
<TextView
android:id="#+id/txt_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="prova"
android:textSize="8pt" />
<TextView
android:id="#+id/txt_place"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="prova"
android:textSize="8pt" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:id="#+id/btn_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="#android:drawable/ic_menu_edit"
android:text="btn_edit" />
<Button
android:id="#+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="btn_close" />
<View
android:id="#+id/view"
android:layout_width="0dp"
android:layout_height="1dp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
I've hard-coded the texts. The main idea is to use a big container layout in background, which is trasparent (background=#0000) and in top of that a layout in wrap_content containing your Views.
If this solution doesn't resolve your problem, I think you could edit height directly in your code. Try to relate to this question

Set your relative layout's height to wrap_content.
For example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- More XML -->
</RelativeLayout>
Also be aware that fill_parent is deprecated for widths and heights.
You can add either margin (extra space outside a view) or padding (extra space inside a view) with android:layout_margin or android:padding respectively. There are also variants such as layout_marginTop that only apply to a specific side of the view.

Is there a way to offset a view from center?

I'm trying to possition my button not exactly in center, but let's say in the 2/5s of the screen height, I was looking for attribute unsuccessfully, so I tried this approach
<RelativeLayout 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"
android:background="#drawable/background"
android:padding="20dp" >
<ImageButton
android:id="#+id/flashlight_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="#+id/fakeView"
android:background="#null"
android:contentDescription="#string/flashlight_button_description"
android:src="#drawable/freeml_bright" />
<View
android:id="#+id/fakeView"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_centerInParent="true"
android:background="#FFAABB" />
</RelativeLayout>
However it does not work, even if I set margin on the fake view.
Padding attribute works, however as it is a big image and if I want it to start at 2/5ths of screen height, it covers the center point of screen, so if I use padding attribute it works but it pushes it away from center and does not allow it to cover it.
Alhough, I made it work using LinearLayout, which I wanted to avoid because there are more Views on top and bottom next to each other so it would lead to nested views using linear layout. Unfortunately I think its the only option.
It basically it uses another linear layout that fills the remaining space left unused by top and bottom views with height=0dp and weight=1 and sets its gravity to center.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="20dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/application_logo_description"
android:src="#drawable/mylight" />
<ImageButton
android:id="#+id/settings_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="#null"
android:contentDescription="#string/settings_button_description"
android:src="#drawable/settings_button" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<ImageButton
android:id="#+id/flashlight_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#null"
android:contentDescription="#string/flashlight_button_description"
android:src="#drawable/flashlight_button_selector" />
<View
android:id="#+id/fakeView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="60dp"
android:background="#FFAABB" />
</LinearLayout>
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:contentDescription="#string/powered_by_description"
android:src="#drawable/powered_by" />
<ImageButton
android:id="#+id/ad_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:background="#null"
android:contentDescription="#string/ad_button_description"
android:src="#drawable/freeml" />
</LinearLayout>

Depending on the screen size of the target device, padding by X dp might move it more than just a fifth of the height.
You might have to code this movement yourself. However, nothing prevents you from doing:
<RelativeLayout 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"
android:background="#drawable/background"
android:padding="20dp" >
<View
android:id="#+id/fakeView"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_centerInParent="true"
android:background="#FFAABB" />
<ImageButton
android:id="#+id/flashlight_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="#+id/fakeView"
android:marginBottom="50dp"
android:background="#null"
android:contentDescription="#string/flashlight_button_description"
android:src="#drawable/freeml_bright" />
</RelativeLayout>

Don't use margin, use padding (top), like so:
<View
android:id="#+id/fakeView"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_centerInParent="true"
android:paddingTop="80dp"
android:background="#FFAABB" />
That should work, though I've not tested it!

try using attribute android:layout_toLeftOf="#+id/fakeView"