Develop Reference

#id is not working inside Relative Layout

As far as I know, the difference between #+id and #id is to create a resource id first time and reuse that already existed resource id in different places. For instance, If we have a Relative layout having two textViews one below another, we shall use #resourceId for the second textView which refers to the first TextView.
The problem is, after updating the android studio to 3.0, #resourceId is not working anymore.To place second textView below the first one, I need to use #+firstTextViewId instead of #firstTextViewId. More specifically I need to use,
android:layout_below="#+id/totalQty"
instead of
android:layout_below="#id/totalQty"
Here is the code
<RelativeLayout
android:id="#+id/relBottomLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<TextView
android:id="#+id/totalQty"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="abcdef"/>
<TextView
android:id="#+id/totalPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/totalQty"
android:text="saasdfdsdfsdf"/>
<TextView
android:id="#+id/totalNetPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/totalPrice"
android:text="abcdsadfsafddgfdgfgdef"
/>
</RelativeLayout>
Is it an understanding issue? or a problem from any end? Can anyone please explain?

I just remove + sign at #+id from your code. Here's the updated code
<RelativeLayout android:id="#+id/relBottomLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="#+id/totalQty"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="abcdef"/>
<TextView
android:id="#+id/totalPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/totalQty"
android:text="saasdfdsdfsdf"/>
<TextView
android:id="#+id/totalNetPrice"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/totalPrice"
android:text="abcdsadfsafddgfdgfgdef"
/>
</RelativeLayout>

list view taking up more space than needed

This is my custom dialog which consist of the following
list view,button and finally a textview used when the list is empty.
My problem is the listview seems to take up more space than it needs to when only 1 item exists.
The image below shows this.
My XML code
<?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" >
<ListView
android:id="#+id/lvRaffles"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/bCloseDialog"
android:layout_alignParentTop="true" >
</ListView>
<Button
android:id="#+id/bCloseDialog"
style="?android:attr/buttonStyleSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#drawable/alert_dialog_button_style"
android:text="Close" />
<TextView
android:id="#+id/tvRaffleEmpty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:gravity="center"
android:text="No Raffle Code Found With That Search"
android:textAppearance="?android:attr/textAppearanceMedium"
android:visibility="gone" />
</RelativeLayout>
I have tried the following.
List View height on wrap_content, 0dp does not help.

I know you fixed this with LinearLayout but to answer your question, the reason it appears as if your listview is taking up too much space is because you used layout_alignParentBottom="true" if you want the button to appear below the listview you would need to use layout_below="#id/lvRaffles" You also have two elements aligned to parentTop, which can cause the elements to overlap.

my android layout isn't aligning buttons with edittext correctly

My buttons and edittext are not right and left aligned carefully .. can anyone explain to me how to solve it?
Also.. the prompt is not beginning from the top of the edittext ... why??
EDIT: I want the 2 buttons horizntally aligned and the edittext below them.
EDIT: I've uploaded a pic on this link: http://t.co/qNA0gssOUG
sorry for inclarity.
<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="#efefef"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".ComposeActivity" >
<Button
android:id="#+id/tweet_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/edittext_tweet"
android:text="#string/tweet_button" />
<Button
android:id="#+id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignLeft="#id/edittext_tweet"
android:text="#string/cancel_button" />
<EditText
android:id="#id/edittext_tweet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_marginTop="10dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#id/cancel_button"
android:background="#ffffff"
android:focusable="true"
android:inputType="textMultiLine" />
</RelativeLayout>

I don't get what you are looking for but perhaps below code may help you. It will give you tweet button on left, cancel button on right and in between these two a Edit Text all Horizontally aligned.
<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="#efefef"
tools:context=".ComposeActivity" >
<Button
android:id="#+id/tweet_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="tweet" />
<EditText
android:id="#+id/edittext_tweet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:layout_toLeftOf="#+id/cancel_button"
android:layout_toRightOf="#id/tweet_button"
android:background="#ffffff"
android:focusable="true"
android:inputType="textMultiLine" />
<Button
android:id="#id/cancel_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Cancel" />
</RelativeLayout>

since your using RelativeLayout , you can align controls (views) relative to one another or relative to the layout using
to align your view relative to it's parent container use:
android:layout_alignParentRight="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
and then u can specify layout_marginLeft/Right/Top/Bottom value in "dp" to have ur component spaced from the border of the container
if u need to align other components relative to that view element
use
android:layout_toLeftOf="#id/'the refrence component id'"
android:layout_toRightOf="#id/'the refrence component id'"
android:layout_above="#id/'the refrence component id'"
android:layout_below="#id/'the refrence component id'"
android:layout_alignBaseline="#id/'the refrence component id'"
here's a good link with visual examples
A Visual Guide to Relative Layouts In Android

I'd suggest to use a LinearLayout (vertical), put another LinearLayout (horizontal) including the buttons in it and add the EditText...
{
{[Button][Button]}
[ EditText ]
}

#user I copied your code and tried it. I don't know what's wrong with it.
pic.twitter.com/HH4MU33EBk --here's what your code created.
perhaps, post an illustration.

Using RelativeLayout, LinearLayout and layout_weight at the same time - weird behaviour

I've got an activity layout specified in an XML file - activity_intro.xml - and I'm trying to create another one that is similar but slightly different - that's going to be activity_instructions.xml.
The Intro activity has a 9patch image at the bottom of the screen that is supposed to stay there and only adjust to different widths of the screens.
The Instructions activity is supposed to contain the same image but above 2 more buttons - all three of these views need to be always located at the bottom of the screen.
activity_intro.xml:
<?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" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#drawable/home_background" >
<LinearLayout
style="#style/Activity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="#+id/introAnimationImageView"
android:layout_width="152dip"
android:layout_height="176dip"
android:layout_gravity="center_horizontal"
android:contentDescription="#string/intro_animation_content_description"
android:src="#drawable/animation_intro01" />
<TextView
android:id="#+id/introTextViewTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/intro_title"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/introTextViewSubtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/intro_subtitle"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
android:id="#+id/introButtonLoginSignup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="#string/intro_button_label_login_signup" />
<Button
android:id="#+id/introButtonInstructions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/introButtonLoginSignup"
android:text="#string/intro_button_label_instructions" />
<Button
android:id="#+id/introButtonReportAnonymously"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/introButtonLoginSignup"
android:layout_centerHorizontal="true"
android:text="#string/intro_button_label_report_anonymously" />
</RelativeLayout>
</LinearLayout>
</ScrollView>
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:contentDescription="#null"
android:scaleType="fitXY"
android:src="#drawable/footer_cityscape" />
</LinearLayout>
Result:
Since I've got working code for Intro, I wanted to make Instructions follow its example but the layout_weight property isn't behaving as expected. First of all, I was only trying to put in the 2 buttons and leave out the image:
<?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" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="0.1"
android:background="#drawable/home_background" >
<LinearLayout
style="#style/Activity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/instructionsTextViewTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/instructions_title_1"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
<ImageView
android:id="#+id/instructionsImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/instructions_image_content_description"
android:src="#drawable/forms" />
<TextView
android:id="#+id/instructionsTextViewDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/instructions_description_1"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</ScrollView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
<Button
android:id="#+id/instructionsButtonPrevious"
style="#style/ButtonPrevious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="#string/instructions_button_label_previous" />
<Button
android:id="#+id/instructionsButtonNext"
style="#style/ButtonNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="#string/instructions_button_label_next" />
</RelativeLayout>
</LinearLayout>
This only worked when I set the layout_weight of the bottom RelativeLayout to 1 (instead of 0) and for the ScrollView 0.1 (instead of 1). If I used the original values the RelativeLayout would take up all the screen. Could anyone explain to me why that is?
I also tried googling the issue and noticed people would suggest to set layout_height to 0dip which I tried but it also didn't work as expected.
Secondly, I tried adding the already mentioned ImageView to the bottom RelativeLayout. This, however, basically displays only the ImageView and not the buttons - or one of the buttons is on top of the image (hiding it). Why is that? Don't I specifically set the buttons to be placed below it?
What should the code look like in order for it to be doing what I expect it?
Further explanation:
Below are images that should help indicate what exactly I want to achieve. The green bits are the ScrollViews - I added them because Android devices tend to have diverse screen sizes. Their purpose is to present the content properly independently of the screen size, i.e. if the screen is small, the user will be able to scroll that part to read the entire text and view the image.
The red bit on the left (Intro) shows the ImageView that is supposed to always be at the bottom of the screen; it'll always be there, visible, and it's the green bit above it that will be movable.
If you take a look at the red bit on the right (Instructions), there's a Next button that's covering the image with the lorry/truck that was visible in the Intro screenshot. Now that's wrong - there should be 2 buttons BELOW the image, as seen on the last screenshot (the 2 blue rectangles).

Android random user interface behavior

Okay I have a full week of frustration behind me, it is the third time that the layout behaves random.
For example:
<TextView
android:id="#+id/tvGebiedHead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="18dp"
android:layout_marginTop="16dp"
android:text="Geef gebied op"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="#+id/lvGebieden"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_alignLeft="#+id/textView1"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView1" >
</ListView>
produces a result where the listview is displayed on top of the textview (making both items unreadable). The code down here produces the desired result, the listview is rendered under the textview. It is not the eclipse graphical editor, but it happens on a real phone as well. Note that the only difference between the two snippets is the id of the TextView.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="18dp"
android:layout_marginTop="16dp"
android:text="Geef gebied op"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="#+id/lvGebieden"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_alignLeft="#+id/textView1"
android:layout_alignParentRight="true"
android:layout_below="#+id/textView1" >
</ListView>
Earlier this week I had a fight with the layout of four togglebuttons which (all!!) changed size, text align on the button, and even location when I clicked one, while the on and off text was exactly the same. Please tell me I am doing something wrong and android is not broken.

In the example on the top, your ListView's layout_below still refers to #id/textView1 which doesn't exist. It does, however, in your example at the bottom, so the bottom is working. FYI, instead of #+id/textView1 you should use #id\textView1 in the layout_below.