Develop Reference

How do I right justify a TextView in a Linear Layout?

I am trying to get the TextView, "tv_amount" to stay on the right side of the screen. I have tried using android:gravity="right" but that hasn't been working for me. Anyone have any suggestions?
Image of emulator running this code:
<?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="45dp"
android:gravity="center_vertical"
android:orientation="horizontal">
<ImageView
android:id="#+id/iv_icon"
android:layout_width="40sp"
android:layout_height="40sp"
android:background="#drawable/circle_border"
android:padding="6sp"
android:layout_marginLeft="6dp"
android:src="#drawable/food"/>
<TextView
android:id="#+id/tv_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginStart="12dp"
android:text="Yummy Pizza"
android:textSize="20sp" />
<TextView
android:id="#+id/tv_amount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="12dp"
android:gravity="end"
android:text="$25"
android:textSize="25sp" />
</LinearLayout>
I am expecting the transaction or "tv_amount" to stay be right justified so that end of the number is staying towards the right side of the screen.
I tried using :
android:layout_weight="0"
android:layout_gravity="end"
android:gravity="right"
but these don't seem to work obviously. I am a beginner when it comes to android development and can't seem to find any answers that have helped anywhere else. They all say to use android:gravity or some other alternative. Maybe there is something in my code that doesn't allow that.

Try it like this:
Splitting the content into left and right will result in the weight and gravity properties working. Check out this layout below.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Title"
android:textSize="20sp" />
<!--Separate layout aligned to the left, containing an image and a yummy pizza label. -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal">
<ImageView
android:id="#+id/iv_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView
android:id="#+id/tv_text_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text Left"
android:textSize="16sp" />
</LinearLayout>
<!--Display the pizza price on a separate label aligned to the right -->
<TextView
android:id="#+id/tv_text_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
android:text="Text Right"
android:layout_weight="1"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>

I am dumb. The issue wasn't with the code in my individual recycler view layout code. It was with my activity_main.xml. I set the recycler_view width to "wrap_content" when it should have been "match_parent." Rookie mistake.

ListView and layout. Why ListView overlaps everything?

This is edited version! I'm new to programming Android apps and I think that this is really difficult, not the java but ui. I am trying to get a list of categories. They can be checkboxes with textview inside the listView or something else. Idea is that an user can just press the boxes/tags/checkboxes/buttons, multiselect. I ended up with checkboxes, because it felt the easiest way, any suggestions how to get easiest solution for end users? User can add categories of his own, so the last row is like button where user can add new categories.
PROBLEM
How can I get a layout where those category checkboxes not overlap settings bar, buttons etc.
Partly solved: I changed the framelayout to LinearLayout and I changed my splash image from imageView to android:background to layout. Now I can see everything but the order is not right. If I move topframe to top (where it should be), I got the error message like this:
ERROR:
java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.Button
ACTIVITY.xml
<LinearLayout
android:id="#+id/buttonContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:orientation="vertical" >
<Button
android:id="#+id/category"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="5dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:background="#drawable/white_button"
android:minHeight="40dp"
android:text="#string/category"
android:textColor="#ffffff"
android:textStyle="bold" />
<Button
android:id="#+id/tak"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:background="#drawable/white_button"
android:minHeight="40dp"
android:text="#string/take"
android:textColor="#ffffff"
android:textStyle="bold" />
<Button
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:layout_marginBottom="5dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:background="#drawable/white_button"
android:minHeight="40dp"
android:text="#string/list"
android:textColor="#ffffff"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/topframe"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#99a8b3b9" >
<Button
android:id="#+id/settings_button"
android:layout_width="43dp"
android:layout_height="37dp"
android:background="#drawable/ic_sysbar_quicksettings" />
<TextView
android:id="#+id/top_category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:text="#string/no_category_text"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#FFFFFF" />
</LinearLayout>

Don't use a FrameLayout to build an UI like this. A FrameLayout puts all childs in the top left corner, that's why your views are overlapping. What I have seen a LinearLayout with vertical orientation should do the job.
Use one like this for example:
<LinearLayout
...
android:orientation="vertical">
...
<LinearLayout
android:id="#+id/topframe"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#99a8b3b9" >
<Button
android:id="#+id/settings_button"
android:layout_width="43dp"
android:layout_height="37dp"
android:background="#drawable/ic_sysbar_quicksettings" />
<TextView
android:id="#+id/top_category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:text="#string/no_category_text"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#FFFFFF" />
</LinearLayout>
<ListView
android:id="#+id/listView1"
android:layout_width="fill_parent"
android:layout_height="377dp" >
</ListView>
...
</LinearLayout>

How to optimise this layout XML file to match my idea?

I've created this fragment named searchfragment. Below there is the layout XML file of the searchfragment. Unfortunatelly the design isn't that smooth as I want it to be.
Here's what I wanted it to look like:
First row: Welcoming text (that works)
Second row: Search input field (that works, too)
Thirt row (and here it gets complicated): There should be a text named "Search for" and then a Spinner with the item you can search for (e.g. name, year, price). Then there's the Search button. Next thing is that you can sort the output. Therefore there's a text with "Sort for", a Spinner with the critirion and a Sort button. Best case the search section should be align to the left and the sort for to the right, but still centered.
Forth row: Output field.
Now as the elements are all present on my device, they are not in the graphical layout of Eclipse. I've tried for hours now to get it working but it's kind of hard if you're not sseing your objects.
Long text - short task: Please help me optimise my design.
searchfragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<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"
android:layout_gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:text="#string/welcome" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/edit_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:hint="#string/edit_message" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center|center_horizontal"
android:layout_marginTop="8dp" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/search_for" />
<Spinner
android:id="#+id/criterion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:entries="#array/searcharray"
android:prompt="#string/prompt" />
<Button
android:id="#+id/btnSubmit"
android:layout_width="136dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="#drawable/android"
android:onClick="sendMessage"
android:text="#string/button_send" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/sort_for"
android:textAppearance="?android:attr/textAppearanceMedium" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<Spinner
android:id="#+id/sort"
android:layout_width="wrap_content"
android:layout_height="0dip"
android:layout_weight="1"
android:entries="#array/sortarray"
android:prompt="#string/prompt" />
</LinearLayout>
<Button
android:id="#+id/sort_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="#drawable/android"
android:onClick="sortAgain"
android:text="#string/button_send" />
</LinearLayout>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/showResults"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium" />
</ScrollView>
</LinearLayout>
I've added a photo of the current design. The space with the red frame around it is the third "row" and should be changed. The second spinner is (I don't know why) much too wide. It should be that wide as the first one. Then all the elements should be about the same heigth and the elements should be centered.

You're on the right track with your layout, but the reason your second Spinner is taking up so much room is that you've set it's layout_weight to 1, and as it's the only one with a layout_weight, it's taking up the rest of the space that's free.
If you want the items to take up a relative amount of space on the screen, then you could stick with using layout_weight and give all of your items that property.
For example, just for your third row you would get rid of the LinearLayout around your Spinner, change some of the layout_width properties and give all of your items a layout_weight.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center|center_horizontal"
android:layout_marginTop="8dp" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/search_for" />
<Spinner
android:id="#+id/criterion"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:entries="#array/searcharray"
android:prompt="#string/prompt" />
<Button
android:id="#+id/btnSubmit"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="#drawable/android"
android:onClick="sendMessage"
android:text="#string/button_send" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="#string/sort_for"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Spinner
android:id="#+id/sort"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:entries="#array/sortarray"
android:prompt="#string/prompt" />
<Button
android:id="#+id/sort_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:background="#drawable/android"
android:onClick="sortAgain"
android:text="#string/button_send" />
</LinearLayout>
This is going to give all of your items an equal weighting, so the TextViews will be the same size as the Spinners which will be the same size as the Buttons. Play around with the layout_weight attribute to make them more relative, for example if you want the Buttons to be twice the size as the Spinners, set their layout_weight to 2.

Simple Layout Issue - Aligning menu button to far right, center

Having a lot of trouble getting an icon to huddle into the position I want it in. I looked at 3 different Stack Overflow questions and tried placing the image in a RelativeLayout, LinearLayout, and a TableRow. All with various XML options. Never managed to get the icon to go right and center itself between top and bottom of the allotted space. In the pic below, red is where it is now, blue is where I want it. Here's a pic (of how it looks now, which is incorrect) and the code (imageView1 is what I want to align):
And the code:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:id="#+id/loginScrollView">
<TableLayout android:layout_width="fill_parent"
android:layout_height="wrap_content" android:orientation="vertical"
android:padding="5dp">
<ImageView android:id="#+id/logoImageView"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:src="#drawable/logo" android:contentDescription="#string/app_name" />
<TextView android:id="#+id/demoTextView"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="#string/logDetails" android:gravity="center_horizontal|center" />
<EditText android:id="#+id/emailEditText"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:hint="#string/loginHint" android:imeOptions="actionNext"
android:inputType="textEmailAddress" android:padding="20dp" />
<EditText android:id="#+id/passEditText"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:hint="#string/password" android:imeOptions="actionDone"
android:inputType="textPassword" android:padding="20dp" />
<TableRow android:id="#+id/rememberTableRow"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<TextView android:id="#+id/rememberTextView"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="#string/rememberDetails" android:layout_gravity="center" />
<CheckBox android:id="#+id/rememberCheckBox"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:padding="20dp" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showPopup"
android:src="#drawable/abs__ic_menu_moreoverflow_holo_dark" android:layout_weight="1" android:layout_gravity="center|right"/>
</TableRow>
<TableRow android:id="#+id/buttonTableRow"
android:layout_width="match_parent" android:layout_height="wrap_content">
<Button android:id="#+id/registerButton" android:layout_width="0dip"
android:layout_height="wrap_content" android:layout_gravity="bottom"
android:layout_weight="1" android:text="#string/register" />
<Button android:id="#+id/loginButton" android:layout_width="0dip"
android:layout_height="wrap_content" android:layout_gravity="bottom"
android:layout_weight="1" android:text="#string/login" />
</TableRow>
</TableLayout>
</ScrollView>
Here are the SO questions I've already looked at and tried to use as solutions:
Aligning ImageView to right of the layout android
Aligning with center in android with hierarchical Layouts
Android ImageButton not displaying on right side of the screen

There are multiple options, as far as I can tell. I'll give you two:
First option is to set a scaletype on the ImageView containing the overflow icon. You make it take up all remaining available space and set the scaletype to fitEnd. This will position the icon all the way at the right.
<ImageView android:id="#+id/imageView1"
android:layout_width="0dp" android:layout_height="wrap_content"
android:layout_gravity="center_vertical" android:scaleType="fitEnd"
android:layout_weight="1" android:onClick="showPopup"
android:src="#drawable/abs__ic_menu_moreoverflow_normal_holo_dark" />
You can accomplish the same effect by setting a weight of 1 on the CheckBox, which will make it 'push' the ImageView with the overflow icon all the way to the right (thanks to a TableRow behaving similarly to a LinearLayout). You can then simply make the ImageView wrap its content. You may want to double check if there are no weird side effects to the clickable region in this case though.
<TableRow android:id="#+id/rememberTableRow"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<TextView android:id="#+id/rememberTextView"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center" android:text="#string/rememberDetails" />
<CheckBox android:id="#+id/rememberCheckBox"
android:layout_width="0dp" android:layout_height="wrap_content"
android:layout_weight="1" android:padding="20dp" />
<ImageView android:id="#+id/imageView1"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center_vertical" android:onClick="showPopup"
android:src="#drawable/abs__ic_menu_moreoverflow_normal_holo_dark" />
</TableRow>

Why are some of my views not aligned correctly at the bottom of my relative layout?

I have problems getting some of my views aligned in a relative layout that I use inside a row of my listview.
Here is a screenshot from the layout builder in Eclipse, this is what I think it should look like:
(source: janusz.de)
The next image is from the emulator. Now the TestTestTest View is at the top and covers the name and distance Textviews.
(source: janusz.de)
This is my layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:padding="4dip">
<ImageView android:id="#+id/logo" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:adjustViewBounds="true"
android:scaleType="centerInside" android:src="#drawable/icon"
android:layout_centerVertical="true" android:layout_alignParentLeft="true"
android:background="#color/green" />
<TextView android:id="#+id/distance" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Distance"
android:layout_alignParentRight="true" android:layout_alignParentTop="true"
android:paddingRight="4dip" android:background="#000000" />
<TextView android:id="#+id/name" android:layout_width="fill_parent"
style="#style/ListHeadText" android:layout_height="wrap_content"
android:text="Name"
android:layout_alignTop="#id/distance" android:layout_toRightOf="#id/logo"
android:layout_toLeftOf="#id/distance" android:gravity="clip_horizontal"
android:lines="1" android:paddingLeft="4dip" android:background="#color/red" />
<TextView android:id="#+id/number" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Number"
android:paddingRight="4dip" android:layout_alignRight="#id/distance"
android:background="#color/darkred" android:layout_below="#id/distance" />
<TextView android:id="#+id/subcategory" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Subcategory"
android:paddingLeft="4dip" android:layout_alignLeft="#id/name"
android:lines="1" android:gravity="clip_horizontal"
android:layout_below="#id/distance" android:background="#color/green" />
<TextView android:id="#+id/test" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="TestTestTest"
android:paddingLeft="4dip"
android:layout_alignParentBottom="true" android:gravity="bottom"
android:background="#color/red" />
Shouldnt align_parent_bottom put the view at the bottom of the cell in the list?

Try adding android:layout_alignParentLeft="true" as well; sometimes Views aren't displayed properly if it can't anchor the view with at least 2 points. Also, is this RelativeLayout used within a ListView? If so, you might find you have some difficulty getting it to look right. There was another question where someone was having a problem where the RelativeLayout looked right on its own, but not once it was included as part of a ListView. We didn't manage to figure out what went wrong so he had to use nested LinearLayouts instead.