Develop Reference

Arrows for list view in Android

Is there any way where I can have default arrows in a list view,without reading them as an array from the xml? If I use ImageViews for arrows,then they might become really ugly. I am bad in graphic design.
Thank you.
EDIT
I found this site that could be useful to many people.
material design icons

You can always use this Unicode codes to draw arrows as text (if that is what you want)
U+2192 →
U+25B6 ▶
U+2794 ➔
More codes here: http://unicode-table.com/en/sets/arrows-symbols/

You can use custom layout to make the arrow as a part of the background of the list view row, look here
you will be able to do something like this:
Just follow the instructions

If you are bad at graphic design you can use free resources from net instead.
Here you have the Google free icon resources you can use with material style where you can find some arrows
Google icon pack

Look at this for android icons for different uses https://romannurik.github.io/AndroidAssetStudio/. You can use it for your list item row. If you want arrow like ios then create row ui and take imageview for arrow.
Row XML :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/tvText"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Your Text"/>
<ImageView
android:id="#+id/ivArrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="#drawable/arrow" >
</ImageView>
</RelativeLayout>

How do I insert an image in an activity with android studio?

I am very new to android development, and have only read and completed the first guide in the android development site. The problem I have been having is that I can not put a picture in an activity. I have the picture in my drawables folder. I just don't know how to get it on the screen. Any help is appreciated.

since you followed the tutorial, I presume you have a screen that says Hello World.
that means you have some code in your layout xml that looks like this
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
you want to display an image, so instead of TextView you want to have ImageView. and instead of a text attribute you want an src attribute, that links to your drawable resource
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/cool_pic"
/>

I'll Explain how to add an image using Android studio(2.3.3). First you need to add the image into res/drawable folder in the project. Like below
Now in go to activity_main.xml (or any activity you need to add image) and select the Design view. There you can see your Palette tool box on left side. You need to drag and drop ImageView.
It will prompt you Resources dialog box. In there select Drawable under the project section you can see your image. Like below
Select the image you want press Ok you can see the image on the Design view. If you want it configure using xml it would look like below.
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/homepage"
tools:layout_editor_absoluteX="55dp"
tools:layout_editor_absoluteY="130dp" />
You need to give image location using
app:srcCompat="#drawable/imagename"

When you have image into yours drawable gallery then you just need to pick the option of image view pick and drag into app activity you want to show and select the required image.

copy the image that you want to show in android app and paste in drawable folder. given below code
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/image"
/>

Styling an Android edit text so as to look like a drop down / spinner picker

I have two EditText views on a layout containing a date and a time. On being clicked these open up my custom DatePickerFragment and a TimePickerFragments. I would like to style the EditTexts with a picker drop corner as the following image shows.
however I have not been able to do this, my text fields look like this:
The pickers all work and are hooked up and return values to the EditTexts, I just want to do the styling correctly. I am happy to change the class of the containers from EditText if they should be something else to get the desired behaviour. I think this should be possible as the first image comes from Google's own design documentation. Looking through the EditText and TextView class documentation and xml attibute documentation. Is there a way to do this?
I am using Xamarin to compile this down but that should make no difference to the answer.

set the Style attribute to the following:
<EditText
style="?android:attr/spinnerStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>

use following image as background of your edittext
make it 9 patch with whatever colour you want.

find an original image and Create a nine patch image like below..
Note : Black Lines are patches
And then add image to background of EditText like below..
<EditText
android:id="#+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/box_edittext"
android:padding="10dp" />
OR
You can use this simple way...
Define style="?android:attr/spinnerStyle" to EditText..
<EditText
style="?android:attr/spinnerStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>

How to add a "plus" button on top of emptyView in ListView

I'd like to add a Button like this one below into my ListView when the list is empty using the setEmptyView() method.
Is there a built-in style in Android for this? Because I noticed that a few apps are using exactly the same Button style.

Look at this link: Add Items to ListView - Android
It shows the correct Android resource to use, which shows a green "+" symbol on the ImageButton.
To be precise:
<ImageButton
android:id="#+id/moreImageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:contentDescription="#string/image_button_delete"
android:src="#android:drawable/ic_input_add" />

Short answer: No, this is not a standard Button.
However, you can add a similar Button by using an ImageView. You just have to design/download something you like.

Is there a view for a button bar? (Image link describing the view)

I am looking for a view or some sort of information regarding the bottom bar in default applications of Android such as Email, or Unlock pattern as shown in the picture below. I have not been able find anything about this on Androids site nor from Google searches.
Image: http://img11.imageshack.us/i/viewdn.jpg/

I believe that Christopher is correct; there is no special widget to create the bar in your image. However, if you want to emulate it, you can create a layout and use the style style="#android:style/ButtonBar". That will give you the light gray background and the correct margins.

I don't believe there's any standard view for the button bar used at the bottom of these apps; it's generally just two Button items placed together in a LinearLayout or RelativeLayout.
For example, looking at the Android Open Source Project, you can see the button bar for one of the email app setup screens is defined as two plain old Button objects.
However, it is surprising that Google didn't abstract more of the common stuff into an Android theme or sublayout, rather than having the same views and attributes in each layout XML.

From: http://code.google.com/p/k9mail/source/browse/k9mail/trunk/res/layout/account_setup_basics.xml?r=1314
<RelativeLayout
android:layout_marginTop="-45dip"
android:padding="0dip"
android:layout_alignParentBottom="true"
android:gravity="bottom|right"
android:background="#android:drawable/bottom_bar"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
<Button
android:id="#+id/manual_setup"
android:text="#string/account_setup_basics_manual_setup_action"
android:minWidth="#dimen/button_minWidth"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginBottom="-4dip"
android:layout_alignParentLeft="true"
android:layout_centerVertical="false"
/>
<Button
android:id="#+id/next"
android:text="#string/next_action"
android:minWidth="#dimen/button_minWidth"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:drawableRight="#drawable/button_indicator_next"
android:layout_marginBottom="-4dip"
android:layout_alignParentRight="true"
android:layout_centerVertical="false"
/>
</RelativeLayout>