How to adjust text font size to fit textview

Question

Is there any way in android to adjust the textsize in a textview to fit the space it occupies   E g  I m using a TableLayout and adding several TextViews to each row  Since I don t want the TextViews to wrap the text I rather see that it lowers the font size of the content   Any ideas   I have tried measureText  but since I don t know the size of the column it seems troublesome to use  This is the code where I want to change the font size to something that fits  TableRow row   new TableRow this      for  int i 0  i  lt  ColumnNames length  i              TextView textColumn   new TextView this             textColumn setText ColumnNames i        textColumn setPadding 0  0  1  0       textColumn setTextColor getResources   getColor R drawable text default                  row addView textColumn  new TableRow LayoutParams         table addView row  new TableLayout LayoutParams

User · Answer

You can now do this without a third party library or a widget. It's built into TextView in API level 26. Add android:autoSizeTextType="uniform" to your TextView and set height to it. That's all. Use app:autoSizeTextType="uniform" for backward compatibility

https://developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html

<?xml version="1.0" encoding="utf-8"?>
<TextView
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:autoSizeTextType="uniform" />

You can also use TextViewCompat for compatibility.

User · Answer

I had the same problem and wrote a class that seems to work for me  Basically  I used a static layout to draw the text in a separate canvas and remeasure until I find a font size that fits  You can see the class posted in the topic below  I hope it helps   Auto Scale TextView Text to Fit within Bounds

User · Answer

Inspired by the previous posters I wanted to share my solution  It works with a scale factor which is applied to the previous font size to make it fit the available space  In addition to prevent unexpected behaviour of TextViews onDraw method  it simply draws the text on its own   public class FontFitTextView extends TextView           How much of the available space should be used in percent      private static final float MARGINHEIGHT   0 8f      private static final float MARGINWIDTH   0 8f       private Paint paint      private int viewWidth      private int viewHeight      private float textHeight      private float textWidth       public FontFitTextView Context c            this c  null              public FontFitTextView Context c  AttributeSet attrs            super c  attrs           initComponent                  Default constructor override     public FontFitTextView Context c  AttributeSet attrs  int defStyle            super c  attrs  defStyle           initComponent               private void initComponent             paint   new Paint            paint setTextSize 30           paint setTextAlign Align CENTER           paint setAntiAlias true              public void setFontColor int c            paint setColor c              private void calcTextSize String s  Canvas c             float availableHeight   viewHeight          float availableWidth   viewWidth              This value scales the old font up or down to match the available            space          float scale   1 0f              Rectangle for measuring the text dimensions         Rect rect   new Rect            float oldFontSize   paint getTextSize                Calculate the space used with old font size         paint getTextBounds s  0  s length    rect           textWidth   rect width            textHeight   rect height                find scale-value to fit the text horizontally         float scaleWidth   1f          if  textWidth  gt  0 0f                scaleWidth    availableWidth    textWidth   MARGINWIDTH                        find scale-value to fit the text vertically         float scaleHeight   1f          if  textHeight  gt  0 0f                scaleHeight    availableHeight    textHeight   MARGINHEIGHT                        We are always limited by the smaller one         if  scaleWidth  lt  scaleHeight                scale   scaleWidth            else               scale   scaleHeight                        We apply the scale to the old font size to make it bigger or smaller         float newFontSize    oldFontSize   scale           paint setTextSize newFontSize                         Calculates the origin on the Y-Axis  width  for the text in this view                  return             private float calcStartDrawingPosX             float left   getMeasuredWidth            float centerY   left -  viewWidth   2           return centerY                        Calculates the origin on the Y-Axis  height  for the text in this view                  return             private float calcStartDrawingPosY             float bottom   getMeasuredHeight               The paint only centers horizontally  origin on the Y-Axis stays at            the bottom  thus we have to lift the origin additionally by the            height of the font          float centerX   bottom -  viewHeight   2     textHeight   2           return centerX              Override     protected void onDraw Canvas canvas            String text   getText   toString            if  text length    gt  0                calcTextSize text  canvas               canvas drawText text  calcStartDrawingPosX                        calcStartDrawingPosY    paint                          Override     protected void onSizeChanged int w  int h  int oldw  int oldh            viewWidth   w          viewHeight   h          super onSizeChanged w  h  oldw  oldh

User · Answer

I used a variation of Dunni solution above  but that particular code didn t work for me  In particular  when trying to use the Paint object set to have the traits of the view s Paint object  and then calling measureText    it doesn t return the same value as directly calling the view s Paint object  Perhaps there are some differences in the way my views are set up that make the behavior different   My solution was to directly use the view s Paint  even though there might be some performance penalties in changing the font size for the view multiple times

User · Answer

I ve been working on improving the excellent solution from speedplane  and came up with this  It manages the height  including setting the margin such that the text should be centered correctly vertically   This uses the same function to get the width  as it seems to work the best  but it uses a different function to get the height  as the height isn t provided anywhere  There are some corrections that need to be made  but I figured out a way to do that  while looking pleasing to the eye    import android content Context  import android graphics Paint  import android graphics Rect  import android util AttributeSet  import android util TypedValue  import android widget TextView   public class FontFitTextView extends TextView        public FontFitTextView Context context            super context           initialize               public FontFitTextView Context context  AttributeSet attrs            super context  attrs           initialize               private void initialize             mTestPaint   new Paint            mTestPaint set this getPaint                max size defaults to the initially specified text size unless it is too small               Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth int textHeight                  if  textWidth  lt   0              return          int targetWidth   textWidth - this getPaddingLeft   - this getPaddingRight            int targetHeight   textHeight - this getPaddingTop   - this getPaddingBottom            float hi   Math min targetHeight 100           float lo   2          final float threshold   0 5f     How close we have to be          Rect bounds   new Rect             mTestPaint set this getPaint              while  hi - lo   gt  threshold                float size    hi lo  2              mTestPaint setTextSize size               mTestPaint getTextBounds text  0  text length    bounds               if  mTestPaint measureText text    gt   targetWidth     1  2  size  float bounds top -bounds bottom    gt  targetHeight                   hi   size     too big             else                 lo   size     too small                      Use lo so that we undershoot rather than overshoot         this setTextSize TypedValue COMPLEX UNIT PX  float  lo                Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                super onMeasure widthMeasureSpec  heightMeasureSpec           int parentWidth   MeasureSpec getSize widthMeasureSpec           int parentHeight   MeasureSpec getSize heightMeasureSpec           int height   getMeasuredHeight            refitText this getText   toString    parentWidth height           this setMeasuredDimension parentWidth  height               Override     protected void onTextChanged final CharSequence text  final int start  final int before  final int after            refitText text toString    this getWidth   this getHeight                 Override     protected void onSizeChanged  int w  int h  int oldw  int oldh             if  w    oldw                refitText this getText   toString    w h                          Attributes     private Paint mTestPaint

User · Answer

Google already made this feature     lt TextView     android layout width  match parent      android layout height  200dp      android autoSizeTextType  uniform    gt    https   developer android com guide topics ui look-and-feel autosizing-textview html

User · Answer

Slight modification to onMeasure    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       int parentWidth   MeasureSpec getSize widthMeasureSpec       int parentHeight   MeasureSpec getSize heightMeasureSpec       refitText this getText   toString    parentWidth       this setMeasuredDimension parentWidth  parentHeight       And binary search on refitText   private void refitText String text  int textWidth          if  textWidth  gt  0                 int availableWidth   textWidth - this getPaddingLeft   - this getPaddingRight                     int trySize    int maxTextSize          int increment      trySize -  int minTextSize     2           testPaint setTextSize trySize           while   trySize  gt  minTextSize   amp  amp   testPaint measureText text   gt  availableWidth                          trySize    increment              increment     increment    0     -1    increment   2              if  trySize  lt   minTextSize                                 trySize    int minTextSize                  break                            testPaint setTextSize trySize                      this setTextSize  TypedValue COMPLEX UNIT PX  trySize

User · Answer

Here is my solution which works on emulator and phones but not very well on Eclipse layout editor  It s inspired from kilaka s code but the size of the text is not obtained from the Paint but from measuring the TextView itself calling measure 0  0    The Java class    public class FontFitTextView extends TextView       private static final float THRESHOLD   0 5f       private enum Mode   Width  Height  Both  None        private int minTextSize   1      private int maxTextSize   1000       private Mode mode   Mode None      private boolean inComputation      private int widthMeasureSpec      private int heightMeasureSpec       public FontFitTextView Context context                super context              public FontFitTextView Context context  AttributeSet attrs                this context  attrs  0              public FontFitTextView Context context  AttributeSet attrs  int defStyle                super context  attrs  defStyle                TypedArray tAttrs   context obtainStyledAttributes attrs  R styleable FontFitTextView  defStyle  0               maxTextSize   tAttrs getDimensionPixelSize R styleable FontFitTextView maxTextSize  maxTextSize               minTextSize   tAttrs getDimensionPixelSize R styleable FontFitTextView minTextSize  minTextSize               tAttrs recycle               private void resizeText                 if  getWidth    lt   0    getHeight    lt   0                      return              if mode    Mode None                      return               final int targetWidth   getWidth                final int targetHeight   getHeight                 inComputation   true              float higherSize   maxTextSize              float lowerSize   minTextSize              float textSize   getTextSize                while higherSize - lowerSize  gt  THRESHOLD                        textSize    higherSize   lowerSize    2                      if  isTooBig textSize  targetWidth  targetHeight                                 higherSize   textSize                         else                               lowerSize   textSize                                                  setTextSize TypedValue COMPLEX UNIT PX  lowerSize               measure widthMeasureSpec  heightMeasureSpec               inComputation   false             private boolean isTooBig float textSize  int targetWidth  int targetHeight                setTextSize TypedValue COMPLEX UNIT PX  textSize               measure 0  0               if mode    Mode Both                      return getMeasuredWidth    gt   targetWidth    getMeasuredHeight    gt   targetHeight              if mode    Mode Width                      return getMeasuredWidth    gt   targetWidth              else                     return getMeasuredHeight    gt   targetHeight             private Mode getMode int widthMeasureSpec  int heightMeasureSpec                int widthMode   MeasureSpec getMode widthMeasureSpec               int heightMode   MeasureSpec getMode heightMeasureSpec               if widthMode    MeasureSpec EXACTLY  amp  amp  heightMode    MeasureSpec EXACTLY                      return Mode Both              if widthMode    MeasureSpec EXACTLY                      return Mode Width              if heightMode    MeasureSpec EXACTLY                      return Mode Height              return Mode None              Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                super onMeasure widthMeasureSpec  heightMeasureSpec               if  inComputation                        this widthMeasureSpec   widthMeasureSpec                      this heightMeasureSpec   heightMeasureSpec                      mode   getMode widthMeasureSpec  heightMeasureSpec                       resizeText                             protected void onTextChanged final CharSequence text  final int start  final int before  final int after                resizeText                Override     protected void onSizeChanged int w  int h  int oldw  int oldh                if  w    oldw    h    oldh                      resizeText               public int getMinTextSize                 return minTextSize             public void setMinTextSize int minTextSize                this minTextSize   minTextSize              resizeText               public int getMaxTextSize                 return maxTextSize             public void setMaxTextSize int maxTextSize                this maxTextSize   maxTextSize              resizeText              The XML attribute file     lt resources gt       lt declare-styleable name  FontFitTextView  gt           lt attr name  minTextSize  format  dimension    gt           lt attr name  maxTextSize  format  dimension    gt       lt  declare-styleable gt   lt  resources gt    Check my github for the latest version of this class  I hope it can be useful for someone  If a bug is found or if the code needs explaination  feel free to open an issue on Github

User · Answer

I had this pain in my projects for soooo long until I found this library   compile  me grantland autofittextview 0 2      You just need to add the xml by your needs and it s done  For example    lt me grantland widget AutofitTextView android layout width  match parent  android layout height  wrap content  android singleLine  true  android maxLines  2  android textSize  40sp  autofit minTextSize  16sp    gt

User · Answer

I don t known this is correct way or not bt its working    take your view and check OnGlobalLayoutListener   and get textview linecount then set textSize    yourView getViewTreeObserver   addOnGlobalLayoutListener new ViewTreeObserver OnGlobalLayoutListener              Override         public void onGlobalLayout                 if  textView getLineCount   gt  3                    textView setTextSize 20                else                    add somthing                                     Its very simple few line code

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I found the following to work nicely for me   It doesn t loop and accounts for both height and width   Note that it is important to specify the PX unit when calling setTextSize on the view    Thanks to the tip in a previous post for this    Paint paint   adjustTextSize getPaint    numChars  maxWidth  maxHeight   setTextSize TypedValue COMPLEX UNIT PX paint getTextSize       Here is the routine I use  passing in the getPaint   from the view   A 10 character string with a  wide  character is used to estimate the width independent from the actual string   private static final String text10  OOOOOOOOOO   public static Paint adjustTextSize Paint paint  int numCharacters  int widthPixels  int heightPixels        float width   paint measureText text10  numCharacters text10 length        float newSize    int   widthPixels width  paint getTextSize         paint setTextSize newSize           remeasure with font size near our desired result     width   paint measureText text10  numCharacters text10 length        newSize    int   widthPixels width  paint getTextSize         paint setTextSize newSize           Check height constraints     FontMetricsInt metrics   paint getFontMetricsInt        float textHeight   metrics descent-metrics ascent      if  textHeight  gt  heightPixels            newSize    int  newSize    heightPixels textHeight            paint setTextSize newSize              return paint

User · Answer

This is speedplane s FontFitTextView  but it only decreases font size if needed to make the text fit  and keeps its font size otherwise  It does not increase the font size to fit height   public class FontFitTextView extends TextView           Attributes     private Paint mTestPaint      private float defaultTextSize       public FontFitTextView Context context            super context           initialize               public FontFitTextView Context context  AttributeSet attrs            super context  attrs           initialize               private void initialize             mTestPaint   new Paint            mTestPaint set this getPaint             defaultTextSize   getTextSize                  Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth             if  textWidth  lt   0    text isEmpty                return           int targetWidth   textWidth - this getPaddingLeft   - this getPaddingRight                this is most likely a non-relevant call         if  targetWidth lt  2               return              text already fits with the xml-defined font size          mTestPaint set this getPaint             mTestPaint setTextSize defaultTextSize           if mTestPaint measureText text   lt   targetWidth                this setTextSize TypedValue COMPLEX UNIT PX  defaultTextSize               return                        adjust text size using binary search for efficiency         float hi   defaultTextSize          float lo   2          final float threshold   0 5f     How close we have to be         while  hi - lo  gt  threshold                float size    hi   lo    2              mTestPaint setTextSize size               if mTestPaint measureText text   gt   targetWidth                    hi   size     too big             else                  lo   size     too small                        Use lo so that we undershoot rather than overshoot         this setTextSize TypedValue COMPLEX UNIT PX  lo               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec            super onMeasure widthMeasureSpec  heightMeasureSpec           int parentWidth   MeasureSpec getSize widthMeasureSpec           int height   getMeasuredHeight            refitText this getText   toString    parentWidth           this setMeasuredDimension parentWidth  height               Override     protected void onTextChanged final CharSequence text  final int start              final int before  final int after            refitText text toString    this getWidth                 Override     protected void onSizeChanged int w  int h  int oldw  int oldh            if  w    oldw    h    oldh                refitText this getText   toString    w                        Here is an example how it could be used in xml    lt com your package activity widget FontFitTextView     android id    id my id      android layout width  match parent      android layout height  wrap content      android gravity  center      android text  My Text      android textSize  60sp    gt    This would keep the font size to 60sp as long as the text fits in width  If the text is longer  it will decrease font size  In this case  the TextViews height will also change because of height wrap content   If you find any bugs  feel free to edit

User · Answer

Use app autoSizeTextType  uniform  for backward compatibility because  android autoSizeTextType  uniform  only work in API Level 26 and higher

User · Answer

This should be a simple solution   public void correctWidth TextView textView  int desiredWidth        Paint paint   new Paint        Rect bounds   new Rect         paint setTypeface textView getTypeface         float textSize   textView getTextSize        paint setTextSize textSize       String text   textView getText   toString        paint getTextBounds text  0  text length    bounds        while  bounds width    gt  desiredWidth                textSize--          paint setTextSize textSize           paint getTextBounds text  0  text length    bounds              textView setTextSize TypedValue COMPLEX UNIT PX  textSize

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I wrote a short helper class that makes a textview fit within a certain width and adds ellipsize       at the end if the minimum textsize cannot be achieved   Keep in mind that it only makes the text smaller until it fits or until the minimum text size is reached  To test with large sizes  set the textsize to a large number before calling the help method   It takes Pixels  so if you are using values from dimen  you can call it like this     float minTextSizePx   getResources   getDimensionPixelSize R dimen min text size   float maxTextWidthPx   getResources   getDimensionPixelSize R dimen max text width   WidgetUtils fitText textView  text  minTextSizePx  maxTextWidthPx       This is the class I use     public class WidgetUtils        public static void fitText TextView textView  String text  float minTextSizePx  float maxWidthPx            textView setEllipsize null           int size    int textView getTextSize            while  true                Rect bounds   new Rect                Paint textPaint   textView getPaint                textPaint getTextBounds text  0  text length    bounds               if bounds width    lt  maxWidthPx                   break                            if  size  lt   minTextSizePx                    textView setEllipsize TextUtils TruncateAt END                   break                            size -  1              textView setTextSize TypedValue COMPLEX UNIT PX  size

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get your context    Context c   getActivity   getApplicationContext     LinearLayout l   new LinearLayout c   l setOrientation LinearLayout VERTICAL   LayoutParams params   new LayoutParams LayoutParams MATCH PARENT  LayoutParams MATCH PARENT  0    l setLayoutParams params   l setBackgroundResource R drawable border    TextView tv new TextView c   tv setText   your text here        set typeface if needed    Typeface tf   Typeface createFromAsset c getAssets    fonts VERDANA TTF      tv setTypeface tf       LayoutParams lp   new LayoutParams     tv setTextColor Color parseColor   282828      tv setGravity Gravity CENTER   Gravity BOTTOM       tv setLayoutParams lp    tv setTextSize 20   l addView tv    return l

User · Answer

I ve written a class that extends TextView and does this  It just uses measureText as you suggest  Basically it has a maximum text size and minimum text size  which can be changed  and it just runs through the sizes between them in decrements of 1 until it finds the biggest one that will fit  Not particularly elegant  but I don t know of any other way   Here is the code   import android content Context  import android graphics Paint  import android util AttributeSet  import android widget TextView   public class FontFitTextView extends TextView        public FontFitTextView Context context            super context           initialise               public FontFitTextView Context context  AttributeSet attrs            super context  attrs           initialise               private void initialise             testPaint   new Paint            testPaint set this getPaint               max size defaults to the intially specified text size unless it is too small         maxTextSize   this getTextSize            if  maxTextSize  lt  11                maxTextSize   20                    minTextSize   10                Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth             if  textWidth  gt  0                int availableWidth   textWidth - this getPaddingLeft   - this getPaddingRight                float trySize   maxTextSize               testPaint setTextSize trySize               while   trySize  gt  minTextSize   amp  amp   testPaint measureText text   gt  availableWidth                     trySize -  1                  if  trySize  lt   minTextSize                        trySize   minTextSize                      break                                    testPaint setTextSize trySize                              this setTextSize trySize                         Override     protected void onTextChanged final CharSequence text  final int start  final int before  final int after            refitText text toString    this getWidth                 Override     protected void onSizeChanged  int w  int h  int oldw  int oldh            if  w    oldw                refitText this getText   toString    w                          Getters and Setters     public float getMinTextSize             return minTextSize             public void setMinTextSize int minTextSize            this minTextSize   minTextSize             public float getMaxTextSize             return maxTextSize             public void setMaxTextSize int minTextSize            this maxTextSize   minTextSize               Attributes     private Paint testPaint      private float minTextSize      private float maxTextSize

User · Answer

In my case using app autoSize was not solving all cases  for example it doesn t prevent word breaking This is what I ended up using  it will resize down the text so that there are no word breaks on multiple lines        Resizes down the text size so that there are no word breaks     class AutoFitTextView  JvmOverloads constructor      context  Context      attrs  AttributeSet    null      defStyleAttr  Int   0     AppCompatTextView context  attrs  defStyleAttr         private val paint   Paint       private val bounds   Rect        override fun onMeasure widthMeasureSpec  Int  heightMeasureSpec  Int            super onMeasure widthMeasureSpec  heightMeasureSpec          var shouldResize   false         paint typeface   typeface         var textSize   textSize         paint textSize   textSize         val biggestWord  String   text split  quot   quot   maxByOrNull   it count        return             Set bounds equal to the biggest word bounds         paint getTextBounds biggestWord  0  biggestWord length  bounds              Iterate to reduce the text size so that it makes the biggest word fit the line         while   bounds width     paddingStart   paddingEnd   paint fontSpacing   gt  measuredWidth                textSize--             paint textSize   textSize             paint getTextBounds biggestWord  0  biggestWord length  bounds              shouldResize   true                   if  shouldResize                setTextSize TypedValue COMPLEX UNIT PX  textSize

User · Answer

Works with modification  You need to set the text view size like this because otherwise setTextSize assumes the value is in SP units   setTextSize TypedValue COMPLEX UNIT PX  trySize     And you needed to explicitly add this code    Override protected void onMeasure int widthMeasureSpec  int heightMeasureSpec        super onMeasure widthMeasureSpec  heightMeasureSpec       int parentWidth   MeasureSpec getSize widthMeasureSpec       int parentHeight   MeasureSpec getSize heightMeasureSpec       refitText this getText   toString    parentWidth

User · Answer

The solution below incorporates all of the suggestions here  It starts with what was originally posted by Dunni  It uses a binary search like gjpc s  but it is a bit more readable  It also include s gregm s bug fixes and a bug-fix of my own   import android content Context  import android graphics Paint  import android util AttributeSet  import android util TypedValue  import android widget TextView   public class FontFitTextView extends TextView        public FontFitTextView Context context            super context           initialise               public FontFitTextView Context context  AttributeSet attrs            super context  attrs           initialise               private void initialise             mTestPaint   new Paint            mTestPaint set this getPaint               max size defaults to the initially specified text size unless it is too small               Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth                  if  textWidth  lt   0              return          int targetWidth   textWidth - this getPaddingLeft   - this getPaddingRight            float hi   100          float lo   2          final float threshold   0 5f     How close we have to be          mTestPaint set this getPaint              while  hi - lo   gt  threshold                float size    hi lo  2              mTestPaint setTextSize size               if mTestPaint measureText text   gt   targetWidth                   hi   size     too big             else                 lo   size     too small                      Use lo so that we undershoot rather than overshoot         this setTextSize TypedValue COMPLEX UNIT PX  lo               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                super onMeasure widthMeasureSpec  heightMeasureSpec           int parentWidth   MeasureSpec getSize widthMeasureSpec           int height   getMeasuredHeight            refitText this getText   toString    parentWidth           this setMeasuredDimension parentWidth  height               Override     protected void onTextChanged final CharSequence text  final int start  final int before  final int after            refitText text toString    this getWidth                 Override     protected void onSizeChanged  int w  int h  int oldw  int oldh            if  w    oldw                refitText this getText   toString    w                          Attributes     private Paint mTestPaint

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Thanks a lot to https   stackoverflow com users 234270 speedplane  Great answer   Here is an improved version of his response that also take care of height and comes with a maxFontSize attribute to limit font size  was useful in my case  so I wanted to share it     package com  lt your package gt    import android content Context  import android content res TypedArray  import android graphics Paint  import android graphics Rect  import android util AttributeSet  import android util TypedValue  import android widget TextView    public class FontFitTextView extends TextView        private Paint mTestPaint      private float maxFontSize      private static final float MAX FONT SIZE DEFAULT VALUE   20f       public FontFitTextView Context context                super context           initialise context  null              public FontFitTextView Context context  AttributeSet attributeSet                super context  attributeSet           initialise context  attributeSet              public FontFitTextView Context context  AttributeSet attributeSet  int defStyle                super context  attributeSet  defStyle           initialise context  attributeSet              private void initialise Context context  AttributeSet attributeSet                if attributeSet  null                        TypedArray styledAttributes   context obtainStyledAttributes attributeSet  R styleable FontFitTextView               maxFontSize   styledAttributes getDimension R styleable FontFitTextView maxFontSize  MAX FONT SIZE DEFAULT VALUE               styledAttributes recycle                      else                       maxFontSize   MAX FONT SIZE DEFAULT VALUE                     mTestPaint   new Paint            mTestPaint set this getPaint               max size defaults to the initially specified text size unless it is too small               Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth  int textHeight                if  textWidth  lt   0              return          int targetWidth   textWidth - this getPaddingLeft   - this getPaddingRight            int targetHeight   textHeight - this getPaddingTop   - this getPaddingBottom            float hi   maxFontSize          float lo   2          final float threshold   0 5f     How close we have to be         final float threshold   1f     How close we have to be          mTestPaint set this getPaint              Rect bounds   new Rect             while   hi - lo   gt  threshold                        float size    hi   lo    2              mTestPaint setTextSize size                mTestPaint getTextBounds text  0  text length    bounds                if  bounds width    gt   targetWidth    bounds height    gt   targetHeight                  hi   size     too big             else                 lo   size     too small              if  mTestPaint measureText text   gt   targetWidth                  hi   size     too big             else                 lo   size     too small                      Use lo so that we undershoot rather than overshoot         this setTextSize TypedValue COMPLEX UNIT PX  lo               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                super onMeasure widthMeasureSpec  heightMeasureSpec           int parentWidth   MeasureSpec getSize widthMeasureSpec           int height   getMeasuredHeight            refitText this getText   toString    parentWidth  height           this setMeasuredDimension parentWidth  height               Override     protected void onTextChanged final CharSequence text  final int start  final int before  final int after                refitText text toString    this getWidth    this getHeight                 Override     protected void onSizeChanged int w  int h  int oldw  int oldh                if  w    oldw                        refitText this getText   toString    w  h                       Corresponding  res values attr xml file    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt        lt declare-styleable name  FontFitTextView  gt           lt attr name  maxFontSize  format  dimension    gt       lt  declare-styleable gt    lt  resources gt    Example    lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns res-auto  http   schemas android com apk res-auto      android id    id home Layout      android layout width  match parent      android layout height  match parent      android background   drawable background      tools ignore  ContentDescription   gt         lt com  lt your package gt  FontFitTextView                     android layout width  match parent                      android layout height  wrap content                      android singleLine  true                      android text  Sample Text                      android textSize  28sp                      res-auto maxFontSize  35sp   gt        lt  RelativeLayout gt    To use the new maxFontSize attribute  don t forget to add xmlns res-auto  http   schemas android com apk res-auto  as show in the example

User · Answer

Extend TextView and override onDraw with the code below  It will keep text aspect ratio but size it to fill the space  You could easily modify code to stretch if necessary      Override   protected void onDraw  NonNull Canvas canvas        TextPaint textPaint   getPaint        textPaint setColor getCurrentTextColor         textPaint setTextAlign Paint Align CENTER       textPaint drawableState   getDrawableState         String text   getText   toString        float desiredWidth   getMeasuredWidth   - getPaddingLeft   - getPaddingRight   - 2      float desiredHeight   getMeasuredHeight   - getPaddingTop   - getPaddingBottom   - 2      float textSize   textPaint getTextSize         for  int i   0  i  lt  10  i            textPaint getTextBounds text  0  text length    rect         float width   rect width          float height   rect height           float deltaWidth   width - desiredWidth        float deltaHeight   height - desiredHeight         boolean fitsWidth   deltaWidth  lt   0        boolean fitsHeight   deltaHeight  lt   0         if   fitsWidth  amp  amp  Math abs deltaHeight   lt  1 0                fitsHeight  amp  amp  Math abs deltaWidth   lt  1 0                close enough         break                 float adjustX   desiredWidth   width        float adjustY   desiredHeight   height         textSize   textSize    adjustY  lt  adjustX   adjustY   adjustX             adjust text size       textPaint setTextSize textSize             float x   desiredWidth   2f      float y   desiredHeight   2f - rect top - rect height     2f      canvas drawText text  x  y  textPaint

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If a tranformation like allCaps is set  speedplane s approach is buggy  I fixed it  resulting in the following code  sorry  my reputation does not allow me to add this as a comment to speedplane s solution    import android content Context  import android graphics Paint  import android util AttributeSet  import android util TypedValue  import android widget TextView   public class FontFitTextView extends TextView        public FontFitTextView Context context            super context           initialise               public FontFitTextView Context context  AttributeSet attrs            super context  attrs           initialise               private void initialise             mTestPaint   new Paint            mTestPaint set this getPaint               max size defaults to the initially specified text size unless it is too small               Re size the font so the specified text fits in the text box        assuming the text box is the specified width              private void refitText String text  int textWidth                  if  getTransformationMethod      null                text   getTransformationMethod   getTransformation text  this  toString                       if  textWidth  lt   0              return          int targetWidth   textWidth - this getPaddingLeft   - this getPaddingRight            float hi   100          float lo   2          final float threshold   0 5f     How close we have to be          mTestPaint set this getPaint              while  hi - lo   gt  threshold                float size    hi lo  2              if mTestPaint measureText text   gt   targetWidth                   hi   size     too big             else                 lo   size     too small                      Use lo so that we undershoot rather than overshoot         this setTextSize TypedValue COMPLEX UNIT PX  lo               Override     protected void onMeasure int widthMeasureSpec  int heightMeasureSpec                super onMeasure widthMeasureSpec  heightMeasureSpec           int parentWidth   MeasureSpec getSize widthMeasureSpec           int height   getMeasuredHeight            refitText this getText   toString    parentWidth           this setMeasuredDimension parentWidth  height               Override     protected void onTextChanged final CharSequence text  final int start  final int before  final int after            refitText text toString    this getWidth                 Override     protected void onSizeChanged  int w  int h  int oldw  int oldh            if  w    oldw                refitText this getText   toString    w                        Attributes     private Paint mTestPaint

[android] How to adjust text font size to fit textview

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