Develop Reference

Can't get rid of the ugly border around ImageButton

I'm working on an Android App which has a few (Next, Back, ... etc) Buttons which are all round and transparent and I use ImageButton for those Buttons, however the problem is there is always a white border around the Button (I use black background so it is very ugly) and the button never appears to be round is appears as some sort of a square-ish shape.
Here is what I tried so far :
Setting the background of the ImageButton in the activity_mypage.xml file to
android:background="#android:color/transparent"
and to
android:background="?android:selectableItemBackground"
and to
android:background="?android:selectableItemBackgroundBorderless"
even to
android:background="#null"
but nothing seems to work on the .xml side.
and I tried the following on the MyPage.java file :
myBtn.setBackgroundResource(0);
and also
myBtn.setBackground(null);
Nothing seems to work anything I do keeps resulting the same (although it removes a gray border from around the Button but none of them makes the Button completely transparent)
This is a screenshot of the button before applying any of above :
And this is a screenshot of the same Button after applying any of those attributes (doesn't really matter if I applied it only to the xml or only to the java file or to both because all results are the same):
This is my xml code for one of my Buttons in xml :
<ImageButton
android:id="#+id/my_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="26dp"
android:layout_marginEnd="37dp"
android:layout_marginRight="37dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:srcCompat="#mipmap/my_btn"
tools:layout_constraintBottom_creator="1"
tools:layout_constraintRight_creator="1"
android:background="#android:color/transparent"
/>
And here is the code for it in the .java file :
ImageButton myBtn= (ImageButton) findViewById(R.id.my_btn);
myBtn.setBackground(null);
myBtn.setBackgroundResource(0);
I'm really lost at this every result I found for this query has suggested one of the above methods but none of these seems to work for me..

Just change
android:background="#android:color/transparent"
to
android:background="#null"

Try with this
android:src="#mipmap/yourimage"
instead of
app:srcCompat="#mipmap/my_btn"

add this to your button
android:background="#drawable/template"
and create a file name it template in your drawable folder
and add this code to it
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_pressed="true" android:drawable="#drawable/btn2imagePressed"></item>
<item android:drawable="#drawable/btn1imageNotPressed"></item> </selector>

You can use ImageView instead of ImageButton, so background issue will not occur
<ImageView
android:id="#+id/my_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="26dp"
android:layout_marginEnd="37dp"
android:layout_marginRight="37dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:src="#mipmap/my_btn"
/>

So after reading some of the posted answers and playing around with the suggestions in my code I noticed that the icon was incorrectly loaded into my mipmap directory instead of drawables and that is because when I imported the icons I selected New -> Image Asset instead of Vector Asset which caused my 'icon' to lose its transparency ...
Thanks to everyone for their replies and answers.

How to underline an EditText

I am having some problems to underline an EditText in AndroidStudio.
This is what I am looking for (this is just a photo, not my real text):
But I do not really know any property to do that.
My code right now is really simple. Just the "normal" one:
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:layout_margin="16dp"
android:id="#+id/tx_titulo"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="#string/pt_titulo"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:allowUndo="true"
/>
I do not want to underline just the text (in this case "Título"), but the whole PlainText
Does anybody know it?
Greets.

It is default, but try to check your styles. Maybe there is a style that will override the style in the whole application. If there is, just remove it

To do this programatically, you could find an answer in this post.
To set the underline color:
editText.getBackground().setColorFilter(color, PorterDuff.Mode.SRC_IN);
To remove the underline color:
editText.getBackground().clearColorFilter();
To do it from the XML, you could add background property to do the same thing in your layout.xml with any drawable resource as a background by adding:
android:background="#drawable/mydrawable"
If you have a couple of EditText with the same style configuration, to avoid setting the attribute to each EditText, you could override EditText's default attributes, defining a custom style like it is done here.

Android adding image to button

I am trying to add an image to a button(image button or normal button) but not in a specific res/drawable folder.
I want this image as a ImageView object or drawable object etc, but I couldn't.

You can set an icon for Button by adding following attribute in XML for Button like this:
android:drawableLeft="#drawable/button_icon"
If you want to know how to do it programmatically, follow this article:
How to programmatically set drawableLeft on Android button?
Or just add 'background':
<Button
android:id="#+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/qrcode"/>
But i think it's better if you use ImageButton, see this example:
<ImageButton
android:id="#+id/searchImageButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/your_image_drawable" />

Use ImageButton and add src in your background:
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/yourImageNameHere"

Android - Button covering TextView in RelativeLayout only in version 5.0+

The target I need to achieve: 2 lines of text and 1 straight line in between should always be on top of Button. So in such a case, setting text in Button's attribute is not applicable according to my knowledge. Therefore I use TextView and View aligning on top of Button to achieve it.
Problem: A strange UI appearance I have come across of Android 5.0+ is that when the Button is enabled, it covers TextView and View even it comes before TextView in RelativeLayout xml file. (according to my knowledge, this means that TextView should on top of Button) The following is my xml code:
<RelativeLayout
android:id="#+id/rl_daily_check_in_button_container"
android:layout_width="140dp"
android:layout_height="140dp"
android:layout_marginBottom="4dp"
android:layout_centerHorizontal="true"
android:layout_above="#+id/textview_check_in_days_in_row">
<Button
android:id="#+id/button_daily_check_in"
android:layout_width="140dp"
android:layout_height="140dp"
android:background="#drawable/daily_checkin_button" />
<TextView
android:id="#+id/textview_check_in"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_above="#+id/view_line"
android:layout_marginBottom="4dp"
android:text="#string/title_not_yet_daily_check_in"
android:textColor="#color/text_gray"
android:textStyle="bold"
android:textSize="36sp" />
<View
android:id="#+id/view_line"
android:layout_width="94dp"
android:layout_height="1dp"
android:layout_centerHorizontal="true"
android:layout_above="#+id/textview_check_in_points"
android:layout_marginBottom="6dp"
android:background="#color/text_gray" />
<TextView
android:id="#+id/textview_check_in_points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="#string/points_can_get_daily_check_in_placeholder"
android:textColor="#color/text_gray"
android:textSize="14sp" />
</RelativeLayout>
But when the app is in Android 5.0-, say 4.4.2, the UI is exactly what I expect. I have tried to set android:elevation="xxdp" attribute, it success until I set the background of Button programatically. Can anyone explain the reason and how the Andoird 5.0+ render its UI? Many Thanks!
Button on Andoird 5.0+:
Button on Android 5.0-:

From Android Lollipop (5.0), the Button has a default StateListAnimator. It has set the default android:elevation and android:translationZ attributes to the Button. Since the Button has default elevation set to it, it appears above the other Views that doesn't have elevation set (Views that has elevation less than the Button, to be precise). i.e. The Views that has higher elevation set to it will appear above the Views that has lower elevation set.
So that's why, when you changed the Button to ImageView, the problem is solved, because ImageView has no default elevation set.

Image view doesn't display image if screen is not rotated and an other image view has been updated

Issue
I've got an issue with 2 ImageViews on Android.
The first displays a large image. It is inside a RelativeLayout, and is a custom ImageView (com.ortiz.touch). It was displaying well until now.
The second is also inside the RelativeLayout but is a "normal" ImageView. It shows bluetooth state. Displaying it doesn't cause any issue.
However, when I put code that changes the src of the bluetooth indicator programatically, the first image is not displayed anymore ....
Is the problem coming from the custom view not doing its job right ? Am I missing something ?
Code
If I'm not doing this kind of stuff :
bluetoothState.setImageResource(R.drawable.bluetooth_enabled192);
The image is displayed correctly.
Here's the layout I use :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#1b1b1b"
android:theme="#style/Theme.AppCompat.Light.NoActionBar.FullScreen">
<com.ortiz.touch.TouchImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/imageView"
android:layout_gravity="center"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_above="#+id/textView" />
<TextView
android:layout_width="fill_parent"
android:layout_height="32dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/emptyDisplayText"
android:layout_gravity="center_horizontal|bottom"
android:gravity="center_vertical|center_horizontal"
android:textAllCaps="true"
android:elegantTextHeight="false"
android:ellipsize="end"
android:maxLines="1"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="15sp"
android:textColor="#f3f3f3"
android:id="#+id/textView"
android:background="#drawable/rounded_rect"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_margin="10dp" />
<ImageView
android:layout_width="52dp"
android:layout_height="52dp"
android:id="#+id/bluetooth_state"
android:scaleType="centerCrop"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/textView"
android:layout_alignEnd="#+id/textView"
android:layout_gravity="top|right"
android:layout_margin="10dp"/>
</RelativeLayout>
Desired Result
What I get is the same screen without the central image (the text and bluetooth indication are displayed correctly)
 NB
I'm starting to get quite depressed on that issue. I just want to display 2 images. Thank you.
Edit
I've not mentioned it, but the main image is loaded in background, using an AsyncTask. I've tried to add some View.invalidate() (on top level layout, on image, on bluetooth indication) but it hasn't solved the problem.
In addition to the image appearing on rotation, it also appears when I try to pinch the non-existant image. And trying to reset the zoom (hacky) programatically doesn't work either.

Okay I've found the error.
As I said, I have a AsyncTask (BitmapWorkerTask) that I call to load a Bitmap into an ImageView in background.
It's called like this :
new BitmapWorkerTask(imageView, getApplicationContext()).execute(filename);
Changing getApplicationContext() to MainActivity.this or getContext() solves the issue :/ (However, I still find it's quite magic how it worked fine for so long even if application context != activity context !)