Develop Reference

Toolbar title not aligned to the center when there's a navigation icon

I have a custom toolbar in which I set the title and other things programatically. The thing is, even though the title has the setting gravity="center", whenever the navigationIcon appears, it is moved a little bit to the side (like in the picture).
I understand that since the icon is not in the xml it must be moving it but is there a way to make the textView stay in the center no matter the icons? Or is there a way to add an ImageView or Button to the xml and then set the navigationIcon to that button so that the icon is contemplated in the code?
This is my xml, I added the buttons but I don't know a way to set the icons programatically.
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintly"
android:layout_width="match_parent"
android:layout_height="41dp"
android:gravity="center"
android:layout_gravity="center">
<Button
android:id="#+id/navigationIcon"
android:layout_width="24dp"
android:layout_height="24dp"
android:scaleType="center"
android:layout_marginStart="12dp"
android:layout_alignParentLeft="true"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/NavBar.Title"
android:singleLine="true"
android:ellipsize="end"
android:layout_gravity="center"
android:gravity="center"
android:layout_marginEnd="12dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:text="Title"/>
<TextView
android:id="#+id/subtitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:ellipsize="end"
android:layout_gravity="center"
android:gravity="center"
android:layout_marginEnd="12dp"
style="#style/NavBar.SubTitle"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/centeredTitleTextView"
tools:text="Subtitle"/>
<Button
android:id="#+id/closeIcon"
android:layout_width="24dp"
android:layout_height="24dp"
android:scaleType="center"
android:layout_marginEnd="12dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>
This is the part where the navigationIcon is set but setNavigationIcon cannot take the view.
public void setNavigationIconArrow() {
super.setNavigationIcon(R.drawable.ic_ui_24dp);
}
public void setNavigationIconClose() {
super.setNavigationIcon(R.drawable.ic_24dp);
}
Thank you.

Because of the icon size, your layout starts after that. So you can't use gravity=center. Also, You can't set static left margin or right margin, Because, Android has so much different screen sizes. So you have to do this programmatically.
1- You have to find the phone's screen width size.
2- Convert that size px to dp.
3- Now you can set the left margin to your layout. Which you want in gravity=center.
I hope, I did help you what you want:)

Android textview width not same

I am doing the chat system. So I need to do the UI for showing the message and sent time.
Please see the below images first. The red color is the text view width and blue color is sent time text view width. Now I set the sent time is right of the text view.
I would like to set the sent time text view have a margin. But you can see the text view width is not same. So I am not hard code the margin. So anybody can give me some useful suggestion to me. Thanks a lots.

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.60"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/tvMessage"
android:layout_width="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="#id/guideline"
android:layout_height="wrap_content"
android:textColor="#color/white_color"
android:background="#color/red_color"
android:maxWidth="#dimen/_151sdp"
android:textStyle="bold"
android:minWidth="30dp"/>
<TextView
android:id="#+id/tvDateTime"
android:layout_width="0dp"
app:layout_constraintBottom_toBottomOf="#id/tvMessage"
app:layout_constraintEnd_toEndOf="#id/tvMessage"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/tvMessage"
android:layout_toRightOf="#id/tvMessage"
android:textColor="#color/chat_mag_date_time"/>
</androidx.constraintlayout.widget.ConstraintLayout>

For using a component in another you can use somethings like : CardView,FrameLayout or ConstraintLayout.
ConstraintLayout like this :
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/msg_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/cardview_dark_background">
<TextView
android:id="#+id/tvMessage"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:maxWidth="151dp"
android:minWidth="30dp"
android:text="fdsfdsfd
dsadas
asd
asd
as"
android:textColor="#color/black"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginEnd="8dp"
/>
<TextView
android:id="#+id/tvDateTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/tvMessage"
android:layout_toRightOf="#id/tvMessage"
android:text="1234"
android:textColor="#color/purple_700"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/tvMessage"
android:layout_marginStart="8dp"
/>
</androidx.constraintlayout.widget.ConstraintLayout>

Add following alignments to the TextView "tvDateTime"
android:layout_alignBottom="#id/tvMessage"
android:layout_alignRight="#id/tvMessage"
and remove the extra alignment instructions, so your TextView code will become:
<TextView
android:id="#+id/tvDateTime"
android:layout_width="wrap_content"
android:text="12:45"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/tvMessage"
android:layout_alignRight="#id/tvMessage"
android:textColor="#color/grey"/>

How to limit the touch area within single Imageview?

Is there any way to limit the touch of Image-view according to it's height and width.

You can do this by putting empty views on the specific areas you want to set touch events for them.
for example: if you want to put 2 different touch events within single Imageview one for the right side and the other for the left side use this block of code:
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/left_side_view"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#android:color/transparent"
app:layout_constraintBottom_toBottomOf="#+id/image_view"
app:layout_constraintEnd_toStartOf="#id/right_side_view"
app:layout_constraintStart_toStartOf="#+id/image_view"
app:layout_constraintTop_toTopOf="#+id/image_view"/>
<View
android:id="#+id/right_side_view"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#android:color/transparent"
app:layout_constraintBottom_toBottomOf="#+id/image_view"
app:layout_constraintEnd_toEndOf="#+id/image_view"
app:layout_constraintStart_toEndOf="#id/left_side_view"
app:layout_constraintTop_toTopOf="#+id/image_view"/>
</androidx.constraintlayout.widget.ConstraintLayout>
then just set touch events to each View.

How to center a TextView on the parent ImageView?

I've tried several ways of doing this and failed each time.
What I want to acomplish is centering TextView (horizontally and vertically) on ImageView, but instead command android:layout_centerInParent="true" results in vertical and horizontal centering on the whole area, not on ImageView. Please help me with attaching parent to TextView or other way of solving this.
Here is my xml code:
<ImageView
android:id="#+id/imageView1"
android:layout_width="170dp"
android:layout_height="46dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:contentDescription="Your Height BG"
android:src="#drawable/textareabg" />
<TextView
android:id="#+id/textView00"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Your Height"
android:textColor="#d88b6d"
android:textSize="20sp" />

It can be easily acheived using ConstraintLayout. Android recently introduced ConstraintLayout. It allows us to lay out child views using ‘constraints’ to define position based relationships between different views found in our layout. It is similar to RelativeLayout, but much more powerful than it because, ConstraintLayout reduces View Hierarchy to a greater extent. Now getting back to your question, Here is the sample xml code which does the work for you
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<ImageView
android:id="#+id/image"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#mipmap/ic_launcher"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Image"
android:textSize="20sp"
app:layout_constraintRight_toRightOf="#+id/image"
app:layout_constraintLeft_toLeftOf="#+id/image"
app:layout_constraintTop_toTopOf="#+id/image"
app:layout_constraintBottom_toBottomOf="#+id/image"/>
</android.support.constraint.ConstraintLayout>
Output View on Device
You can position the TextView anywhere on the ImageView using app:layout_constraintHorizontal_bias and app:layout_constraintVertical_bias. By default these values will be set to 0.5. So, it will be center aligned by default , if we don't specify any values.
When you add a constraint to both sides of a view (and the view size
for the same dimension is either "fixed" or "wrap content"), the view
becomes centered between the two anchor points by default.
Note: Bias attribute only works if you specify the constraints for the boundaries (e.g. top and bottom for vertical bias, left and right for horizontal bias)
More about ConstraintLayout
ConstraintLayout
Sample Project
Blog on ConstraintLayout

Try this way,hope this will help you to solve your problem.
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/imageView1"
android:layout_width="170dp"
android:layout_height="46dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:contentDescription="Your Height BG"
android:src="#drawable/textareabg" />
<TextView
android:id="#+id/textView00"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Your Height"
android:textColor="#d88b6d"
android:textSize="20sp" />
</FrameLayout>

Perhaps this would help you with your question
Android TextView text won't center
A person here mentions using android:gravity="center".

Here's what I would do
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="170dp"
android:layout_height="46dp"
android:layout_centerHorizontal="false"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:contentDescription="Your Height BG" />
<TextView
android:id="#+id/textView00"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/imageView1"
android:layout_alignTop="#+id/imageView1"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_marginLeft="30dp"
android:layout_marginTop="10dp"
android:text="Your Height"
android:textColor="#d88b6d"
android:textSize="20sp" />

What you need to do is use FrameLayout.The doc says:
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.
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.
So you need something like following psuedo layout code:
<FrameLayout>
<ImageView gravity="center">
<TextView gravity="center">
</FrameLayout>

Add one more relative layout under your layout like this :
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/imageView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
Check for width and height you want. Eg. If you want specific height and width for image, change height and width of this relative layout.
Thats it...

how to check if the string is overflowing from my view in android?

I have a listview in Android which is dynamically loaded. The list view holds an image and on it is shows the description of the image which should ideally take up 20% of the images' height. How do I check if my textview which is on top of the image view in my list is taking a max height of 20% of the image?
As you can see from the screenshot, "Harvey's - -check in for a chance to win a free burger
Picker, ON" is fitting in the textview in 2 lines, sometimes if my android device is small it exceeds the background (black colored) view and looks bad. I need to stop that so I decided I must truncate the string if it overflows on my textview.
How do I truncate the strings on the textview so that once that 20% of the imageview height has been reached the image description ends with "..."
The xml I have at the moment is given below. Note that com.parse.myPackage.AspectRatioImageView is just a custom view for an imageview
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFFFF" >
<com.parse.myPackage.AspectRatioImageView
android:id="#+id/campaignImageLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="#drawable/blank" />
<FrameLayout
android:id="#+id/frameLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/frameLayout2"
android:layout_alignParentLeft="true"
android:background="#color/fadedBlack">
<TextView
android:id="#+id/campaignNameLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Loading..."
android:layout_marginLeft="10dp"
android:textColor="#color/white"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
</FrameLayout>
<FrameLayout
android:id="#+id/frameLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/campaignImageLabel"
android:layout_alignParentLeft="true"
android:background="#color/fadedBlack">
<TextView
android:id="#+id/campaignLocationLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="Location Loading..."
android:textColor="#color/white"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
</FrameLayout>

You can use :
android:ellipsize="end"
android:maxLines="1"
If android:maxLines="1"does do your job then you can try Android:singleLine="true"