Develop Reference

ListView not displaying right

So i`m coding this custom listView Adapter. The adapter AXML looks like this:
The problem is that when i compile and run in emulator, the ListView item turns into this :
Can anyone help me figure out what is happening? Maybe help me fix it?. If you need any code let me know.
UPDATE: AXML file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:minWidth="25px"
android:minHeight="25px">
<TextView
android:text="ABC 232"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/shopName"
android:textColor="#3c3c3c"
android:textSize="22dp" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linearLayout2"
android:weightSum="1">
<TextView
android:text="~800m away"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/distance"
android:layout_marginLeft="0.0dp"
android:textColor="#3c3c3c"
android:layout_weight="0.5"/>
<TextView
android:text="Total: 12.45 RON"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/total"
android:layout_gravity="right"
android:layout_marginLeft="22.0dp"
android:textColor="#3c3c3c"
android:layout_weight="0.5"/>
</LinearLayout>
</LinearLayout>

Please change all the text views width and height attribute to wrap_content. Specially for text view for shopName.
You can also remove linearLayout1, linearLayout3 and linearLayout4. Since they added noting important to your view.

You do not need to encapsulate each TextView in a LinearLayout. If you desire padding around the font, the TextView has padding attributes that will achieve the same effect in a cleaner manner.
If you clean up the code in this way, the issue with views not appearing may appear clearer.

It could be much simpler, use relative layout and align all three text one another.
Steps to design:
1) Take Parent Relative layout and make it centre vertical and horizontal
2) Place text1 and make align top of parent and give margin or padding from left
3) Place text2 below of text1 and give padding or margin from top.
4) Place text3 toRight of text1 or text2 or make make it centre vertical and horizontal of parent or you give margin left. it is your choice which once you choose.
Let me if you want more help. :)GlbMP

Why my TextView under an ImageView is not showing

I am writing an Android game. In the level selection activity's layout file, I want to layout the levels' buttons (They are actually ImageViews) like this:
x x x
x x x
And each level button has a TextView, with that level's name as the text, below it (Let's call these two views together as a "level choice"). I used a lot of LinearLayouts to do this. Here is the code for a level choice:
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_weight="1">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/angles"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/angles_level"
android:textSize="#dimen/level_text_size"/>
</LinearLayout>
As you can see, the two views' height and width are all wrap_content. But when I look at the designer, the text view doesn't show up.When I select the text view in the component tree, it shows where the text view is:
P.S. The picture isn't showing all six levels because I haven't made them yet.
As you can see, the text view is right at the bottom! When I select the ImageView, it shows that it is occupying all the space of its parent!
I don't know why this is happening, my image is certainly a square! Can you explain why this is happening and how do I fix it?
If you need my whole layout code, feel free to tell me in the comments.

For me, the best solution is to position and size it properly by code (where you have total control) instead of xml.
Anyway, i think your problem can be solved by setting ImageViews ScaleType
imageView1.setScaleType(ScaleType.FIT_START);
By XML:
android:scaleType="fit_start"
Hope this helps.

I use background color for textview when I'm studying the layout.
If you use wrap content in both dimension for TextView, that is invisible since you did not write any text inside it. wrap content means that the view take the minimum space. And no text means 0px; try to set ImageView and TextView with layout_weight 1 and layout_height 0dp. In this way both view take half of space of parent layout

Because right now, your LinearLayout doesn't know how to distribute the ratio of its children. And in fact, your imageview's wrap content already
consumes the whole space.
So, LinearLayout says "Sorry TextView, you have no space left".
Use layout_weight to both of the children.
I guess you want to have your picture twice the size of your text.
2:1
That is,
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_weight="1">
<ImageView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight=2
android:src="#drawable/angles"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight=1
android:text="#string/angles_level"
android:textSize="#dimen/level_text_size"/>
</LinearLayout>

I just realized that I posted a question about ImageViews leaving out too much whitespace:
LinearLayout leaving out too much white space. Why?
I think this is the same as that problem. So I tried setting adjustViewBounds to true in the xml. And it works! Now the image view look like this:
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:src="#drawable/parallel_lines"/>

You can use relative layout
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/angles"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/angles_level"
android:textSize="#dimen/level_text_size"/>
</RelativeLayout>
or simple you can set background of textview to that image by putting this
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/angles_level"
android:background="#drawable/angles"
android:textSize="#dimen/level_text_size"/>

Linearlayout spacing in Android

This is my layout:
TEXTVIEW
IMAGEVIEW (optional)
LINEARLAYOUT - to which I add Buttons dynamically
LINEARLAYOUT - with two buttons side by side (left button and right button)
What do I need to do to ensure that the bottom two linear layouts are fixed to the bottom of the screen, regardless of how much space they may take up? ie. The first linear layout might have 3 buttons and take up over half the screen, which is okay. It just needs to be above the left/right buttons in the last linear layout, which is fixed to the bottom.
Then I want my TextView and my ImageView vertically centred in the remaining space. The ImageView will be set to invisible if there is no image, so it could only be the text view which needs to be centred.
I've been playing around with android:gravity="bottom", android:layout_height="0dip"/android:layout_weight="1" (I later realised this would only give 50% to the text/imageview and 50% to the 2 linear layouts), but I can't get my desired result.
Any advice appreciated.

You have to take RelativeLayout.
There you have a better control of the relative position of the views, something like this:
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
>
<TextView
android:id="#+id/textView"
android:layout_above="#+id/imageView"
android:layout_centerVertical="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<ImageView
android:id="#+id/imageView"
android:layout_above="#+id/ll_1"
android:layout_centerVertical="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLyout
android:id="#+id/ll_1"
android:layout_above="#+id/ll_2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<LinearLyout
android:id="#+id/ll_2"
android:layout_alignParentBottom="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>

Icon with text inside - how to define in layout?

I want to have a TextView (to show a count) hovering over an icon in the ActionBar. What I did was have a RelativeLayout, set a background to it, then put that TextView in that layout and screw with the margin until it fits, but that is broken as soon as the text length varies.
Setting a background on the TextView isn't great either because I can't position the text in relation to the icon.
Here's my XML:
<?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:orientation="vertical"
android:layout_gravity="fill_horizontal" >
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:background="#drawable/cart" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:layout_marginTop="5dp" android:layout_marginLeft="43dp"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout> </RelativeLayout>
and here is a screenshot to show you what I mean:
Is there a stress-free way, a library perhaps, that lets me set a TextView over a Drawable so that the TextView is always centered/ positioned?

Setting a background on the TextView isn't great either because I can't position the text in relation to the icon.
Actually you can position your text relative to your icon. You need to separate the cart icon and the number badge icon as separate images, and lay them out individually. I had to do this myself not too long ago, and I did it with a RelativeLayout, with an ImageView of the cart icon and a TextView for the numbers with a 9-patch "badge" as the background.
The trick is to align your number TextView to the left and bottom of your cart icon ImageView, and then use the left and bottom margins to push your number badge to the top and right of your cart icon. This way, the number badge is always anchored based on your cart icon.
Also, set the gravity of your TextView to center, so as the numbers grow wider, the relative position of the text is about the same. Lastly, use padding on your TextView to control how much gap there is between the edge of the number and the edge of your "badge" 9-patch.
Here's a snippet of my implementation (I've redacted some of this):
<RelativeLayout
android:id="#+id/cartButton"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/cartIconImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="#drawable/ic_menu_cart" />
<TextView
android:id="#+id/cartBadge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/cartIconImageView"
android:layout_alignLeft="#+id/cartIconImageView"
android:layout_marginBottom="10dp"
android:layout_marginLeft="9dp"
android:background="#drawable/state_list_cart_badge"
android:gravity="center"
android:includeFontPadding="false"
android:lines="1"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:text="7" />
</RelativeLayout>
And this is what it looks like:

Use a FrameLayout. It's always called useless but if you ask me it's perfect to lay out one View on top of another.
Quote:
Child views are drawn in a stack, with the most recently added child on top. The size of the FrameLayout is the size of its largest child (plus padding), visible or not (if the FrameLayout's parent permits). Views that are GONE are used for sizing only if setConsiderGoneChildrenWhenMeasuring() is set to true.

I would just use a TextView, and set a 9 patch as the background:
You might have to play around with it (I just whipped this up in a minute or two), but something like the very bottom right in the image is what you want. It will be a lot more consistent than dealing with two views.

Why button is not centered vertically in LinearLayout?

I have a LinearLayout, which only contains one button. I want this button to be centered vertically and aligned to the right. I tried many ways, but I couldn't make this button centered vertically. It is always aligned to the top. I also tried to put a button in RelativeLayout, the button can not be centered vertically either.
The XML is as below. Is there anything wrong with this layout? Thanks.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#E8E3E4">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="More"
android:layout_gravity="right" />
</LinearLayout>
Changing android:layout_gravity="right" to android:layout_gravity="right|center_vertical" didn't resolve the problem in my question.

You say in words that you want this to be centered vertically, but you have not said in XML that you want this to be centered vertically. You will need to adjust your android:layout_gravity attribute to specify both right and center_vertical.
However, I would recommend you go back to RelativeLayout. Use android:layout_centerVertical="true" and android:layout_alignParentRight="true" to make the button be centered vertically and right-aligned.
Also, bear in mind that your current LinearLayout has android:layout_height="wrap_content", which means there is nothing to be centered inside. You need the container to have more space than its contents (e.g., fill_parent) if you want centering to have any meaning.

This code will put the button in vertical center and on the right screen
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_vertical">
<Button
android:id="#+id/btnClick"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="Click Me" />
</LinearLayout>

Try adding android:gravity="center" to your LinearLayout. I remember having read somewhere that that might do the trick.