Develop Reference

EditText like Note

I am developing Android Application like Note App. All of things were going pretty well.Here my output.
But, I have facing a problem that is the lines in my EditText become unequal with text when I typed Myanmar Language (one of South East Asia Language), here my output,
I googled and try many ways. But, it can't help me. Below are my code. Kindly!
LinedEditText.java
public class LinedEditText extends android.support.v7.widget.AppCompatEditText {
private Rect mRect;
private Paint mPaint;
// we need this constructor for LayoutInflater
public LinedEditText(Context context, AttributeSet attrs) {
super(context, attrs);
mRect = new Rect();
mPaint = new Paint();
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setColor(0x800000FF);
}
#Override
protected void onDraw(Canvas canvas) {
int height = getHeight();
int line_height = getLineHeight();
int count = height / line_height;
if (getLineCount() > count)
count = getLineCount();
Rect r = mRect;
Paint paint = mPaint;
int baseline = getLineBounds(0, r);
for (int i = 0; i < count; i++) {
canvas.drawLine(r.left, baseline + 2, r.right, baseline + 2, paint);
baseline += getLineHeight();
}
super.onDraw(canvas);
}
}
actvity_main.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">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="50dp"
android:maxLength="10"
android:ems="10"
android:hint="Title Here" />
<login.fb.ucsy.com.notepad.LinedEditText
android:id="#+id/edit_story"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="20dp"
android:background="#null"
android:inputType="textMultiLine|textNoSuggestions"
android:minLines="10"
android:gravity="top|left"
android:singleLine="false"
android:imeOptions="actionNone"
android:text="Story : \n" />
</LinearLayout>

How to make a view like this ? Actually I tried with drawable views but can't get it

I want to make the design like image and also display same in phone and 7 inch tab.
I am using Linear layout by dividing the view in 5 part of the screen with using Framlayout draw a line but not possible to achieve like this image.
What's the other option like using canvas or any other better option.
First Image is displing expected result.
and other two are getting result.
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<gradient
android:angle="360.0"
android:endColor="#A29AA4"
android:startColor="#A29AA4" />
</shape>
Below layout
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="5">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center">
<View
android:id="#+id/mView_circle1"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#drawable/circleshape" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center">
<View
android:id="#+id/mView_circle2"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#drawable/circleshape" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center">
<View
android:id="#+id/mView_circle3"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#drawable/circleshape" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center">
<View
android:id="#+id/mView_circle4"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#drawable/circleshape" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center">
<View
android:id="#+id/mView_circle5"
android:layout_width="20dp"
android:layout_height="20dp"
android:background="#drawable/circleshape" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_gravity="center_vertical"
android:background="#A29AA4">
</RelativeLayout>
</FrameLayout>

This is easier and cleaner in canvas. Here is how you would do the first one.. You can replicate this with slight modifications for the other two.
Create a Canvas View:
public class CanvasView extends View {
Paint bPaint;
RectF coordbounds;
public CanvasView(Context context) {
super(context);
}
private void init()
{
bPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
bPaint.setStyle(Paint.Style.FILL_AND_STROKE);
bPaint.setColor(Color.BLACK);
}
#Override
public void onDraw(android.graphics.Canvas canvas)
{
super.onDraw(canvas);
canvas.drawLine(coordbounds.left,coordbounds.centerY(),
coordbounds.right,coordbounds.centerY(),bPaint);
int circledia=20;
//Divide the line into four segments and subtract 2 * half the radii
float actualspan = (coordbounds.right - coordbounds.left) - (2 * circledia/2);
//Segment the line into 3 parts
float interlinesegments = actualspan/(4-1);
for(int i=0; i<4;i++)
{
canvas.drawCircle(coordbounds.left + circledia/2 +
(i*interlinesegments),
coordbounds.centerY(),10,bPaint);
}
}
}
Create a layout to hold the view and call this view in your activity:
LinearLayout layout = (LinearLayout) findViewById(R.id.root);
CanvasView view = new CanvasView(this);
layout.addView(view);
oops, I forgot . :-) Please add this method in CanvasView class to declare the bounding box and set the layout:
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
float xpad = (float) (getPaddingLeft() + getPaddingRight());
float ypad = (float) (getPaddingTop() + getPaddingBottom());
float coww = 0.0f, cohh = 0.0f, coll = 0.0f;
init();
coww = (float) w - xpad;
cohh = (float) h - ypad;
// Create a bounding box
coordbounds = new RectF(0.0f,0.0f,
coww,cohh);
}
EDIT : Change the above methods for bitmap
private void init()
{
bPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
bPaint.setStyle(Paint.Style.FILL_AND_STROKE);
bPaint.setColor(Color.BLACK);
bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.button);
}
Change onDraw as follows:
#Override
public void onDraw(android.graphics.Canvas canvas)
{
super.onDraw(canvas);
canvas.drawLine(coordbounds.left,coordbounds.centerY(),
coordbounds.right,coordbounds.centerY(),bPaint);
int rectwidth=bitmap.getWidth();
int rectheight=bitmap.getHeight();
//Divide the line into four segments and subtract 2 * half the radii
float actualspan = (coordbounds.right - coordbounds.left) - (2 * rectwidth/2);
//Segment the line into 3 parts
float interlinesegments = actualspan/(4-1);
for(int i=0; i<4;i++)
{
float left= coordbounds.left + (i * interlinesegments);
float top= coordbounds.centerY()-rectheight/2;
float right = coordbounds.left+(i * interlinesegments)+rectwidth;
float bottom= coordbounds.centerY()+ rectheight/2;
canvas.drawBitmap(bitmap,null,new RectF(left,top,right,bottom),null);
}
}

With the help of above code and previous code I made this Combination of circle shape and bitmap.
#Override
public void onDraw(android.graphics.Canvas canvas)
{
super.onDraw(canvas);
canvas.drawLine(coordbounds.left, coordbounds.centerY(),
coordbounds.right, coordbounds.centerY(), bPaint);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_myprofile);
int rectwidth=bitmap.getWidth();
int rectheight=bitmap.getHeight();
//Divide the line into four segments and subtract 2 * half the radii
float actualspan_image = (coordbounds.right - coordbounds.left) - (2 * rectwidth/2);
//Segment the line into 3 parts
float interlinesegments_bitmap = actualspan_image / (4 - 1);
int circledia = 20;
//Divide the line into four segments and subtract 2 * half the radii
float actualspan = (coordbounds.right - coordbounds.left) - (2 * circledia/2);
//Segment the line into 3 parts
float interlinesegments = actualspan/(4-1);
for(int i=0; i<4;i++)
{
float left= coordbounds.left + (i * interlinesegments_bitmap);
float top= coordbounds.centerY()-rectheight/2;
float right = coordbounds.left+(i * interlinesegments_bitmap)+rectwidth;
float bottom= coordbounds.centerY()+ rectheight/2;
if(i==1){
canvas.drawBitmap(bitmap,null,new RectF(left,top,right,bottom),null);
}else{
canvas.drawCircle(coordbounds.left + circledia / 2 +
(i * interlinesegments),
coordbounds.centerY(), 10, bPaint);
}
}
}

Aligning drawableLeft with text of button

Here is my layout:
The issue I'm facing is with the drawable checkmark. How would I go about aligning it next to the text, both of them centered within the button? Here is the XML:
<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"
tools:context=".PostAssignmentActivity" >
<LinearLayout
style="?android:attr/buttonBarStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<Button
style="?android:attr/buttonBarButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableLeft="#drawable/ic_checkmark_holo_light"
android:text="Post" />
<Button
style="?android:attr/buttonBarButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Cancel" />
</LinearLayout>
</RelativeLayout>
Applying android:gravity="center_vertical" pulls the text and drawable together, but then the text is no longer aligned in the center.

Solution 1
Set android:paddingLeft inside your first button. This will force the drawableLeft by paddingLeft amount to the right. This is the fast/hacky solution.
Solution 2
Instead of using a ButtonView, use a LinearLayout that contains both a textview and imageview. This is a better solution. It gives you more flexibility in the positioning of the checkmark.
Replace your ButtonView with the following code. You need the LinearLayout and TextView to use buttonBarButtonStyle so that the background colors are correct on selection and the text size is correct. You need to set android:background="#0000" for the children, so that only the LinearLayout handles the background coloring.
<LinearLayout
style="?android:attr/buttonBarButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal" >
<ImageView
style="?android:attr/buttonBarButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="false"
android:background="#0000"
android:src="#drawable/ic_checkmark_holo_light"/>
<TextView
style="?android:attr/buttonBarButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="false"
android:background="#0000"
android:text="Done" />
</LinearLayout>
Here are some screenshots I took while trying this out.

None of these solutions worked correctly without presenting unacceptable trade-offs (create a layout with views in it? Not a good idea). So why not roll your own? This is what I got:
First create an attrs.xml with this:
<resources>
<declare-styleable name="IconButton">
<attr name="iconSrc" format="reference" />
<attr name="iconSize" format="dimension" />
<attr name="iconPadding" format="dimension" />
</declare-styleable>
</resources>
This allows to create an icon with specific size, padding from text, and image in our new view. The view code looks like this:
public class IconButton extends Button {
private Bitmap mIcon;
private Paint mPaint;
private Rect mSrcRect;
private int mIconPadding;
private int mIconSize;
public IconButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
}
public IconButton(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public IconButton(Context context) {
super(context);
}
#Override
protected void onDraw(Canvas canvas) {
int shift = (mIconSize + mIconPadding) / 2;
canvas.save();
canvas.translate(shift, 0);
super.onDraw(canvas);
if (mIcon != null) {
float textWidth = getPaint().measureText((String)getText());
int left = (int)((getWidth() / 2f) - (textWidth / 2f) - mIconSize - mIconPadding);
int top = getHeight()/2 - mIconSize/2;
Rect destRect = new Rect(left, top, left + mIconSize, top + mIconSize);
canvas.drawBitmap(mIcon, mSrcRect, destRect, mPaint);
}
canvas.restore();
}
private void init(Context context, AttributeSet attrs) {
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.IconButton);
for (int i = 0; i < array.getIndexCount(); ++i) {
int attr = array.getIndex(i);
switch (attr) {
case R.styleable.IconButton_iconSrc:
mIcon = drawableToBitmap(array.getDrawable(attr));
break;
case R.styleable.IconButton_iconPadding:
mIconPadding = array.getDimensionPixelSize(attr, 0);
break;
case R.styleable.IconButton_iconSize:
mIconSize = array.getDimensionPixelSize(attr, 0);
break;
default:
break;
}
}
array.recycle();
//If we didn't supply an icon in the XML
if(mIcon != null){
mPaint = new Paint();
mSrcRect = new Rect(0, 0, mIcon.getWidth(), mIcon.getHeight());
}
}
public static Bitmap drawableToBitmap (Drawable drawable) {
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable)drawable).getBitmap();
}
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
}
And then it can be used like this:
<com.example.grennis.myapplication.IconButton
android:layout_width="200dp"
android:layout_height="64dp"
android:text="Delete"
app:iconSrc="#android:drawable/ic_delete"
app:iconSize="32dp"
app:iconPadding="6dp" />
This works for me.

You can use
<com.google.android.material.button.MaterialButton/> .
https://material.io/develop/android/components/material-button/
It finally allows setting the icon gravity.
<com.google.android.material.button.MaterialButton
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:gravity="center"
android:text="Awesome button"
app:icon="#drawable/your_icon"
app:iconGravity="textStart" />

Here is a clean easy way, without doing anything fancy, to achieve the results of having a Button that is much wider than the content with Image and Text which are centered.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:background="#drawable/button_background_selector">
<Button
android:layout_centerInParent="true"
android:gravity="center"
android:duplicateParentState="true"
android:layout_width="wrap_content"
android:text="New User"
android:textSize="15sp"
android:id="#android:id/button1"
android:textColor="#android:color/white"
android:drawablePadding="6dp"
android:drawableLeft="#drawable/add_round_border_32x32"
android:layout_height="64dp" />
</RelativeLayout>

In our case, we wanted to use the default Button class (to inherit its various styles and behaviors) and we needed to be able to create the button in code. Also, in our case we could have text, an icon (left drawable), or both.
The goal was to center the icon and/or text as a group when the button width was wider than wrap_content.
public class CenteredButton extends Button
{
public CenteredButton(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
// We always want our icon and/or text grouped and centered. We have to left align the text to
// the (possible) left drawable in order to then be able to center them in our onDraw() below.
//
setGravity(Gravity.LEFT|Gravity.CENTER_VERTICAL);
}
#Override
protected void onDraw(Canvas canvas)
{
// We want the icon and/or text grouped together and centered as a group.
// We need to accommodate any existing padding
//
float buttonContentWidth = getWidth() - getPaddingLeft() - getPaddingRight();
// In later versions of Android, an "all caps" transform is applied to buttons. We need to get
// the transformed text in order to measure it.
//
TransformationMethod method = getTransformationMethod();
String buttonText = ((method != null) ? method.getTransformation(getText(), this) : getText()).toString();
float textWidth = getPaint().measureText(buttonText);
// Compute left drawable width, if any
//
Drawable[] drawables = getCompoundDrawables();
Drawable drawableLeft = drawables[0];
int drawableWidth = (drawableLeft != null) ? drawableLeft.getIntrinsicWidth() : 0;
// We only count the drawable padding if there is both an icon and text
//
int drawablePadding = ((textWidth > 0) && (drawableLeft != null)) ? getCompoundDrawablePadding() : 0;
// Adjust contents to center
//
float bodyWidth = textWidth + drawableWidth + drawablePadding;
canvas.translate((buttonContentWidth - bodyWidth) / 2, 0);
super.onDraw(canvas);
}
}

Here is my code and working perfect.
<Button
android:id="#+id/button"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:background="#drawable/green_btn_selector"
android:gravity="left|center_vertical"
android:paddingLeft="50dp"
android:drawableLeft="#drawable/plus"
android:drawablePadding="5dp"
android:text="#string/create_iou"
android:textColor="#color/white" />

public class DrawableCenterTextView extends TextView {
public DrawableCenterTextView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
}
public DrawableCenterTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DrawableCenterTextView(Context context) {
super(context);
}
#Override
protected void onDraw(Canvas canvas) {
Drawable[] drawables = getCompoundDrawables();
if (drawables != null) {
Drawable drawableLeft = drawables[0];
Drawable drawableRight = drawables[2];
if (drawableLeft != null || drawableRight != null) {
float textWidth = getPaint().measureText(getText().toString());
int drawablePadding = getCompoundDrawablePadding();
int drawableWidth = 0;
if (drawableLeft != null)
drawableWidth = drawableLeft.getIntrinsicWidth();
else if (drawableRight != null) {
drawableWidth = drawableRight.getIntrinsicWidth();
}
float bodyWidth = textWidth + drawableWidth + drawablePadding;
canvas.translate((getWidth() - bodyWidth) / 2, 0);
}
}
super.onDraw(canvas);
}
}

This is now available in the Material Button by default with the app:iconGravity property. However, the Material Button does not allow for setting the background to a drawable (RIP gradients).
I converted the answers by #BobDickinson and #David-Medenjak above to kotlin and it works great.
import android.content.Context
import android.graphics.Canvas
import android.util.AttributeSet
import android.view.Gravity
import androidx.appcompat.widget.AppCompatButton
import kotlin.math.max
class CenteredButton #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyle: Int = R.attr.buttonStyle
) : AppCompatButton(context, attrs, defStyle) {
init {
gravity = Gravity.LEFT or Gravity.CENTER_VERTICAL
}
override fun onDraw(canvas: Canvas) {
val buttonContentWidth = (width - paddingLeft - paddingRight).toFloat()
var textWidth = 0f
layout?.let {
for (i in 0 until layout.lineCount) {
textWidth = max(textWidth, layout.getLineRight(i))
}
}
val drawableLeft = compoundDrawables[0]
val drawableWidth = drawableLeft?.intrinsicWidth ?: 0
val drawablePadding = if (textWidth > 0 && drawableLeft != null) compoundDrawablePadding else 0
val bodyWidth = textWidth + drawableWidth.toFloat() + drawablePadding.toFloat()
canvas.save()
canvas.translate((buttonContentWidth - bodyWidth) / 2, 0f)
super.onDraw(canvas)
canvas.restore()
}
}

I know it's a bit late, but if anyone looking for another answer, here is another way to add icon without the need to wrap button with a ViewGroup
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="#+id/btnCamera"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Click!"
android:textAllCaps="false"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
*need to set textAllCaps to false to make the spannable working
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val buttonLabelBuilder = SpannableStringBuilder(btnCamera.text)
val iconDrawable = AppCompatResources.getDrawable(this, R.drawable.ic_camera)
iconDrawable?.setBounds(0, 0, btnCamera.lineHeight, btnCamera.lineHeight)
val imageSpan = ImageSpan(iconDrawable, ImageSpan.ALIGN_BOTTOM)
buttonLabelBuilder.insert(0, "i ")
buttonLabelBuilder.setSpan(imageSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
btnCamera.text = buttonLabelBuilder
}
}

I started with #BobDickinson's answer, but it did not cope well with multiple lines. The approach is good, because you still end up with a Button that can properly be reused.
Here is an adapted solution that will also work if the button has multiple lines (Please don't ask why.)
Just extend Button and use the following in onDraw, the getLineRight() is used to look up the actual length of each line.
#Override
protected void onDraw(Canvas canvas) {
// We want the icon and/or text grouped together and centered as a group.
// We need to accommodate any existing padding
final float buttonContentWidth = getWidth() - getPaddingLeft() - getPaddingRight();
float textWidth = 0f;
final Layout layout = getLayout();
if (layout != null) {
for (int i = 0; i < layout.getLineCount(); i++) {
textWidth = Math.max(textWidth, layout.getLineRight(i));
}
}
// Compute left drawable width, if any
Drawable[] drawables = getCompoundDrawables();
Drawable drawableLeft = drawables[0];
int drawableWidth = (drawableLeft != null) ? drawableLeft.getIntrinsicWidth() : 0;
// We only count the drawable padding if there is both an icon and text
int drawablePadding = ((textWidth > 0) && (drawableLeft != null)) ? getCompoundDrawablePadding() : 0;
// Adjust contents to center
float bodyWidth = textWidth + drawableWidth + drawablePadding;
canvas.save();
canvas.translate((buttonContentWidth - bodyWidth) / 2, 0);
super.onDraw(canvas);
canvas.restore();
}

Here is a another solution:
<LinearLayout
android:id="#+id/llButton"
android:layout_width="match_parent"
style="#style/button_celeste"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
style="#style/button_celeste"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawablePadding="10dp"
android:clickable="false"
android:drawableLeft="#drawable/icon_phone"
android:text="#string/call_runid"/>
</LinearLayout>
and the event:
LinearLayout btnCall = (LinearLayout) findViewById(R.id.llButton);
btnCall.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
call(runid.Phone);
}
});

I had the same issue, and I've come up with a solution that doesn't require XML changes or custom Views.
This code snippet retrieves the width of the text and the left/right drawables, and sets the Button's left/right padding so there will only be enough space to draw the text and the drawables, and no more padding will be added.
This can be applied to Buttons as well as TextViews, their superclasses.
public class TextViewUtils {
private static final int[] LEFT_RIGHT_DRAWABLES = new int[]{0, 2};
public static void setPaddingForCompoundDrawableNextToText(final TextView textView) {
ViewTreeObserver vto = textView.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
shinkRoomForHorizontalSpace(textView);
}
});
}
private static void shinkRoomForHorizontalSpace(TextView textView) {
int textWidth = getTextWidth(textView);
int sideCompoundDrawablesWidth = getSideCompoundDrawablesWidth(textView);
int contentWidth = textWidth + sideCompoundDrawablesWidth;
int innerWidth = getInnerWidth(textView);
int totalPadding = innerWidth - contentWidth;
textView.setPadding(totalPadding / 2, 0, totalPadding / 2, 0);
}
private static int getTextWidth(TextView textView) {
String text = textView.getText().toString();
Paint textPaint = textView.getPaint();
Rect bounds = new Rect();
textPaint.getTextBounds(text, 0, text.length(), bounds);
return bounds.width();
}
private static int getSideCompoundDrawablesWidth(TextView textView) {
int sideCompoundDrawablesWidth = 0;
Drawable[] drawables = textView.getCompoundDrawables();
for (int drawableIndex : LEFT_RIGHT_DRAWABLES) {
Drawable drawable = drawables[drawableIndex];
if (drawable == null)
continue;
int width = drawable.getBounds().width();
sideCompoundDrawablesWidth += width;
}
return sideCompoundDrawablesWidth;
}
private static int getInnerWidth(TextView textView) {
Rect backgroundPadding = new Rect();
textView.getBackground().getPadding(backgroundPadding);
return textView.getWidth() - backgroundPadding.left - backgroundPadding.right;
}
}
Notice that:
It actually still leaves some more space than needed (good enough for my purposes, but you may look for the error)
It overwrites whatever left/right padding is there. I guess it's not difficult to fix that.
To use it, just call TextViewUtils.setPaddingForCompoundDrawableNextToText(button) on your onCreate or onViewCreated().

There are several solutions to this problem. Perhaps the easiest on some devices is to use paddingRight and paddingLeft to move the image and text next to each other as below.
Original button
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="16dp"
android:text="#string/scan_qr_code"
android:textColor="#color/colorPrimary"
android:drawableLeft="#drawable/ic_camera"
android:paddingRight="90dp"
android:paddingLeft="90dp"
android:gravity="center"
/>
The problem here is on smaller devices this padding can cause unfortunate problems such as this:
The other solutions are all some version of "build a button out of a layout an image and a textview". They work, but completely emulating a button can be tricky. I propose one more solution; "build a button out of a layout an image, a textview, and a button"
Here's the same button rendered as I propose:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:layout_marginTop="16dp"
android:gravity="center"
>
<Button
android:id="#+id/scanQR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/white_bg_button"
/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_centerInParent="true"
android:gravity="center"
android:elevation="10dp"
>
<ImageView
android:id="#+id/scanImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="8dp"
android:src="#drawable/ic_camera"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Button"
android:text="#string/scan_qr_code"
android:textColor="#color/colorPrimary"
/>
</LinearLayout>
</RelativeLayout>
As you can see, the button is now within a relative layout, but it's text and drawableLeft are not part of the button, they are in a separate layout that's placed on top of the button. With this, the button still acts like a button. The gotchas are:
The inner layout needs an elevation for newer versions of Android. The button itself has an elevation greater than the ImageView and TextView, so even though they are defined after the Button, they will still be "below" it in elevation and be invisible. Setting 'android:elevation' to 10 solves this.
The textAppearance of the TextView must be set so that it has the same appearance as it would in a button.

Another quite hacky alternative is to add blank spacer views with weight="1" on each side of the buttons. I don't know how this would affect performance.
<View
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1" />

How to have Image and Text Center within a Button

I want to display TEXT and Icon on a Button.
+----------------------------+
| Icon TEXT |
+----------------------------+
I tried with
<Button
android:id="#+id/Button01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="40dip"
android:text="TEXT"
android:drawableLeft="#drawable/Icon" />
But Text and Icon is not in center.
My Text size varies, according to text size Icon and Text should get adjusted to center.
How should i do it?

You can fake it by making a more complex layout, but I'm not sure whether it's worth it. Here's something I hacked together:
<?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="wrap_content">
<Button
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignTop="#+id/foreground"
android:layout_alignBottom="#id/foreground"
android:layout_alignRight="#id/foreground"
android:layout_alignLeft="#id/foreground"
android:onClick="clickedMe" />
<RelativeLayout
android:id="#id/foreground"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/button_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="#string/hello" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="#id/button_text"
android:paddingTop="10dip"
android:paddingBottom="10dip"
android:src="#drawable/icon" />
</RelativeLayout>
</RelativeLayout>
There might be a more concise way to do it. I tend to struggle getting RelativeLayout to do what I want sometimes. Note that you need to pay attention to the z-order (Button needs to appear first in the top level RelativeLayout) and you might need to adjust padding to get it to look the way you want.

Similar to some other approaches, I think a good solution is to extend Button and add the missing functionality by overriding its onLayout method:
public class CenteredIconButton extends Button {
private static final int LEFT = 0, TOP = 1, RIGHT = 2, BOTTOM = 3;
// Pre-allocate objects for layout measuring
private Rect textBounds = new Rect();
private Rect drawableBounds = new Rect();
public CenteredIconButton(Context context) {
this(context, null);
}
public CenteredIconButton(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.buttonStyle);
}
public CenteredIconButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (!changed) return;
final CharSequence text = getText();
if (!TextUtils.isEmpty(text)) {
TextPaint textPaint = getPaint();
textPaint.getTextBounds(text.toString(), 0, text.length(), textBounds);
} else {
textBounds.setEmpty();
}
final int width = getWidth() - (getPaddingLeft() + getPaddingRight());
final Drawable[] drawables = getCompoundDrawables();
if (drawables[LEFT] != null) {
drawables[LEFT].copyBounds(drawableBounds);
int leftOffset =
(width - (textBounds.width() + drawableBounds.width()) + getRightPaddingOffset()) / 2 - getCompoundDrawablePadding();
drawableBounds.offset(leftOffset, 0);
drawables[LEFT].setBounds(drawableBounds);
}
if (drawables[RIGHT] != null) {
drawables[RIGHT].copyBounds(drawableBounds);
int rightOffset =
((textBounds.width() + drawableBounds.width()) - width + getLeftPaddingOffset()) / 2 + getCompoundDrawablePadding();
drawableBounds.offset(rightOffset, 0);
drawables[RIGHT].setBounds(drawableBounds);
}
}
}
The sample only works for left and right drawables, but could be extended to adjust top and bottom drawables too.

How about this one?
<?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"
android:background="#color/lovely_color"
android:clickable="true"
android:onClick="clickHandler">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="no?"
android:textColor="#color/white"
android:layout_centerHorizontal="true"
android:drawableLeft="#drawable/lovely_icon"
android:drawablePadding="10dp"
android:padding="10dp"
android:gravity="center"
android:textSize="21sp"/>
</RelativeLayout>

This should work
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<TextView
android:id="#+id/button_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="hello" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dip"
/>
</LinearLayout>

How about using a SpannableString as the text with an ImageSpan?
Button myButton = ...
SpannableString ss = new SpannableString(" " + getString(R.string.my_button_text));
Drawable d = getResources().getDrawable(R.drawable.myIcon);
d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
ImageSpan span = new ImageSpan(d, DynamicDrawableSpan.ALIGN_BOTTOM);
ss.setSpan(span, 0, 1, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
myButton.setText(ss);

You can just set a padding depending on button size and image size:
Button button1 = null;
//initialize button….
ViewGroup.LayoutParams params = button1.getLayoutParams();
int btn1Width = ((int) (0.33 * (double)ecranWidth));
params.width = btn1Width;
button1.setLayoutParams(params);
button1.setPadding((btn1Width/2-9), 0, 0, 0);
//where (btn1Width/2-9) = size of button divided on 2 minux half size of icon…

The easy way (albeit not perfect) is to set the paddingRight to the same width as your icon.

<com.google.android.material.button.MaterialButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/your_text"
app:icon="#drawable/ic_example"
app:iconGravity="textStart"/>

This is what I did... It can be improved. The text is centered and the icon is to the left. So they both aren't centered as a group.
public class CustomButton extends Button
{
Rect r = new Rect();
private Drawable buttonIcon = null;
private int textImageSeparation = 10;
public CustomButton(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public CustomButton(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public CustomButton(Context context)
{
super(context);
}
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
Drawable icon = getButtonIcon();
if(icon != null)
{
int drawableHeight = icon.getIntrinsicHeight();
int drawableWidth = icon.getIntrinsicWidth();
if(icon instanceof BitmapDrawable)
{
Bitmap bitmap = ((BitmapDrawable)icon).getBitmap();
drawableWidth = (int) AndroidScreenUtils.dipToPixels(bitmap.getWidth());
drawableHeight = (int) AndroidScreenUtils.dipToPixels(bitmap.getHeight());
}
else
{
drawableWidth = (int) AndroidScreenUtils.dipToPixels(icon.getIntrinsicWidth());
drawableHeight = (int) AndroidScreenUtils.dipToPixels(icon.getIntrinsicHeight());
}
float textWidth = getLayout().getPaint().measureText(getText().toString());
float left = ((getWidth() - textWidth) / 2) - getTextImageSeparation() - drawableWidth;
int height = getHeight();
int top = (height - drawableHeight) /2;
int right = (int) (left + drawableWidth);
int bottom = top + drawableHeight;
r.set((int) left, top, right, bottom);
icon.setBounds(r);
icon.draw(canvas);
}
}
private Drawable getButtonIcon()
{
return buttonIcon;
}
public void setButtonIcon(Drawable buttonIcon)
{
this.buttonIcon = buttonIcon;
}
private int getTextImageSeparation()
{
return textImageSeparation;
}
public void setTextImageSeparation(int dips)
{
this.textImageSeparation = (int) AndroidScreenUtils.dipToPixels(dips);
}
}

<LinearLayout
style="#style/Sonnen.Raised.Button.Transparent.LightBlueBorder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:orientation="horizontal"
android:padding="20dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:drawableLeft="#drawable/refresh"
android:drawablePadding="10dp"
android:drawableStart="#drawable/refresh"
android:gravity="center"
android:text="#string/generic_error_button_text"
android:textColor="#color/dark_sky_blue"
android:textSize="20sp"/>
</LinearLayout>

I made a custom component to solve this problem.
Component class:
class CustomImageButton #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0,
defStyleRes: Int = 0
) : RelativeLayout(context, attrs, defStyleAttr, defStyleRes) {
init {
inflate(context, R.layout.custom_image_button, this)
// Load the styled attributes and set their properties
val typedArray = context.obtainStyledAttributes(
attrs,
R.styleable.CustomImageButton, defStyleAttr, 0
)
val src = typedArray?.getDrawable(R.styleable.CustomImageButton_cib_src)
val text = typedArray?.getText(R.styleable.CustomImageButton_cib_text)
val contentDescription = typedArray?.getText(R.styleable.CustomImageButton_cib_contentDescription)
ivIcon.setImageDrawable(src)
tvText.text = text
ivIcon.contentDescription = contentDescription
typedArray?.recycle()
}
}
Component XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:toos="http://schemas.android.com/tools"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_width="fill_parent"
android:layout_height="#dimen/button_height">
<Button
android:id="#+id/bClick"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignTop="#+id/foreground"
android:layout_alignBottom="#id/foreground"
android:layout_alignEnd="#id/foreground"
android:layout_alignStart="#id/foreground"/>
<RelativeLayout
android:id="#id/foreground"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/tvText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#color/textWhite"
toos:text="Some text to test"
toos:ignore="RelativeOverlap"/>
<ImageView
android:id="#+id/ivIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toStartOf="#id/tvText"
android:paddingTop="1dip"
android:paddingBottom="1dip"
android:src="#mipmap/some_image_to_test"
toos:ignore="ContentDescription"/>
</RelativeLayout>
</RelativeLayout>
The resources attributes, attrs.xml:
<declare-styleable name="CustomImageButton">
<attr name="cib_src" format="reference"/>
<attr name="cib_text" format="string"/>
<attr name="cib_contentDescription" format="string"/>
</declare-styleable>
Component use example:
<app.package.components.CustomImageButton
android:id="#+id/cibMyImageButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:cib_src="#mipmap/my_image_to_put_in_the_button"
app:cib_text="Some text to show in the button"
app:cib_contentDescription="icon description"/>

This is a hack, but worked for me with a negative margin:
<Button
android:id="#+id/some_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableStart="#drawable/some_drawable"
android:drawablePadding="-118dp"
android:paddingEnd="28dp"
android:text="#string/some_string" />
A better way would probably be doing this in a custom view

android:layout_gravity="center_vertical|center_horizontal|center" >

android RadioButton button drawable gravity

I am generating RadioButtons dynamically with
RadioButton radioButton=new RadioButton(context);
LayoutParams layoutParams=new LayoutParams(radioWidth,radioHeight);
layoutParams.gravity=Gravity.CENTER;
radioButton.setLayoutParams(layoutParams);
radioButton.setGravity(Gravity.CENTER);
BitmapDrawable bitmap = ((BitmapDrawable)drawableResource);
bitmap.setGravity(Gravity.CENTER);
radioButton.setBackgroundDrawable(getResources().getDrawable(R.drawable.itabs_radio));
radioButton.setButtonDrawable(bitmap);
as you can see I am desperately trying to set gravity of button drawable to center, but without a reason its always center and left aligned, heres the reason- the default style of android radio button:
<style name="Widget.CompoundButton">
<item name="android:focusable">true</item>
<item name="android:clickable">true</item>
<item name="android:textAppearance">?android:attr/textAppearance</item>
<item name="android:textColor">?android:attr/textColorPrimaryDisableOnly</item>
<item name="android:gravity">center_vertical|left</item>
</style>
<style name="Widget.CompoundButton.RadioButton">
<item name="android:background">#android:drawable/btn_radio_label_background</item>
<item name="android:button">#android:drawable/btn_radio</item>
</style>
Is there any way I can align button drawable to center?

According to CompoundButton.onDraw() source code it's always left-aligned.
(Note the line buttonDrawable.setBounds(0, y, buttonDrawable.getIntrinsicWidth(), y + height);)
You will have to derive a new class from RadioButton and override onDraw().
EXAMPLE ADDED LATER:
Ok, so here's what you do. Firstly, here's a layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<org.test.TestProj.RadioButtonCenter
android:id="#+id/myview"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:layout_centerInParent="true"
android:text="Button test"
/>
</RelativeLayout>
Secondly here's the custom-drawing RadioButtonCenter:
package org.test.TestProj;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.RadioButton;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
public class RadioButtonCenter extends RadioButton {
public RadioButtonCenter(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CompoundButton, 0, 0);
buttonDrawable = a.getDrawable(1);
setButtonDrawable(android.R.color.transparent);
}
Drawable buttonDrawable;
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (buttonDrawable != null) {
buttonDrawable.setState(getDrawableState());
final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
final int height = buttonDrawable.getIntrinsicHeight();
int y = 0;
switch (verticalGravity) {
case Gravity.BOTTOM:
y = getHeight() - height;
break;
case Gravity.CENTER_VERTICAL:
y = (getHeight() - height) / 2;
break;
}
int buttonWidth = buttonDrawable.getIntrinsicWidth();
int buttonLeft = (getWidth() - buttonWidth) / 2;
buttonDrawable.setBounds(buttonLeft, y, buttonLeft+buttonWidth, y + height);
buttonDrawable.draw(canvas);
}
}
}
Finally, here's an attrs.xml file you need to put in res/values so the code can get at platform-defined attributes.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CompoundButton">
<attr name="android:button" />
</declare-styleable>
</resources>

Simple solution, you can add a background to RadioButton, or set background="#null", .
<RadioButton
android:id="#+id/cp_rd_btn"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"/>
updated:
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#null"
android:button="#null"
android:drawableTop="#drawable/account_coolme_selector"
android:gravity="center" />
<RadioButton
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:background="#null"
android:button="#null"
android:drawableTop="#drawable/account_qq_selector"
android:gravity="center"
/>
</RadioGroup>

Based on #hoot answers, I had customised it to make both text and drawable to the center without using attars,
class RadioButtonCenter(context: Context, attrs: AttributeSet) : RadioButton(context, attrs) {
internal var buttonDrawable: Drawable? = null
init {
buttonDrawable = CompoundButtonCompat.getButtonDrawable(this#RadioButtonCenter)
}
override fun onDraw(canvas: Canvas) {
val iconHeight = buttonDrawable!!.intrinsicHeight
val buttonWidth = buttonDrawable!!.intrinsicWidth
val totalWidth =
buttonWidth + paint.measureText(text.toString()) + paddingLeft + paddingRight + compoundDrawablePadding
if (totalWidth >= width) {
super.onDraw(canvas)
} else {
setButtonDrawable(android.R.color.transparent)
val availableSpace = ((width - totalWidth) / 2).toInt()
buttonDrawable!!.state = drawableState
val height = height
var yTop = 0
val verticalGravity = gravity and Gravity.VERTICAL_GRAVITY_MASK
when (verticalGravity) {
Gravity.BOTTOM -> yTop = height - iconHeight
Gravity.CENTER_VERTICAL -> yTop = (height - iconHeight) / 2
}
var rightWidth = availableSpace + buttonWidth
buttonDrawable!!.setBounds(availableSpace, yTop, rightWidth, yTop + iconHeight)
buttonDrawable!!.draw(canvas)
rightWidth += compoundDrawablePadding
val yPos = (height / 2 - (paint.descent() + paint.ascent()) / 2) as Float
canvas.drawText(
text.toString(),
(rightWidth).toFloat(),
yPos,
paint
)
}
}
}

Based on #Reprator answers.
JAVA version:
public class RadioButtonCentered extends AppCompatRadioButton {
private Drawable buttonDrawable;
public RadioButtonCentered(Context context) {
super(context);
}
public RadioButtonCentered(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RadioButtonCentered(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onDraw(Canvas canvas) {
if (buttonDrawable != null) {
int iconHeight = buttonDrawable.getIntrinsicHeight();
int buttonWidth = buttonDrawable.getIntrinsicWidth();
int width = getWidth();
float totalWidth = buttonWidth + getPaint().measureText(getText().toString()) + getPaddingLeft() + getPaddingRight() + getCompoundDrawablePadding();
if (totalWidth >= width) { super.onDraw(canvas); }
else {
int yTop = 0;
int height = getHeight();
int availableSpace = (int) ((width - totalWidth) / 2);
int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
int rightWidth = availableSpace + buttonWidth;
switch (verticalGravity) {
case Gravity.BOTTOM:
yTop = height - iconHeight;
break;
case Gravity.CENTER_VERTICAL:
yTop = (height - iconHeight) / 2;
break;
}
setButtonDrawable(android.R.color.transparent);
buttonDrawable.setState(getDrawableState());
buttonDrawable.setBounds(availableSpace, yTop, rightWidth, yTop + iconHeight);
buttonDrawable.draw(canvas);
float yPos = (height / 2 - (getPaint().descent() + getPaint().ascent()) / 2);
canvas.drawText(getText().toString(), ((float) (rightWidth + getCompoundDrawablePadding())), yPos, getPaint());
}
} else {buttonDrawable = CompoundButtonCompat.getButtonDrawable(this); invalidate();}
}
}

I also think this sounds like a bug since it's always left-aligned. In my case I solved the issue by setting android:minWidth="0dp" and android:layout_width="wrap_content", since Material components had set the android:minWidth to a width larger than the drawable width. If the RadioButton needs to be centered it can then be added to a container and thus no custom view needs to be implemented.
Here's an example of how it could look:
<FrameLayout
android:layout_width="200dp"
android:layout_height="200dp">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:clickable="false"
android:minWidth="0dp" />
</FrameLayout>
However, be aware that the minimum width was set there for a reason, Material design used ?attr/minTouchTargetSize. So if you do like above, the container should maybe also be touchable.

<radiogroup android:paddingLeft = "20dp" android:background="#color/gray">
Basically - I have a horizontally aligned radio group, and by expanding the background color to the left 20dp (or whatever 1/2 of your width of radio button) it appears as if it's centered.

you need foreground. not background. see args for layout and set em programmatically:
<RadioButton>
...
android:button="#null"
android:foreground="#drawable/your_selector_for_center_drawable"
android:background="#drawable/your_selector_for_background_drawable"
android:foregroundGravity="center"
</RadioButton>