Measuring text width to be drawn on Canvas ( Android )
AndroidTextAndroid CanvasDrawAndroid Problem Overview
Is there a method which returns the width ( in pixels ) of a text to be drawn on an Android canvas using the drawText() method according to the Paint used to draw it?
Android Solutions
Solution 1 - Android
Have you looked at android.graphics.Paint#measureText(String txt)?
Solution 2 - Android
Paint paint = new Paint();
Rect bounds = new Rect();
int text_height = 0;
int text_width = 0;
paint.setTypeface(Typeface.DEFAULT);// your preference here
paint.setTextSize(25);// have this the same as your text size
String text = "Some random text";
paint.getTextBounds(text, 0, text.length(), bounds);
text_height = bounds.height();
text_width = bounds.width();
Solution 3 - Android
Supplemental answer
There is a slight difference between the width returned by Paint.measureText
and Paint.getTextBounds
. measureText
returns a width that includes the glyph's advanceX value padding the beginning and end of the string. The Rect
width returned by getTextBounds
does not have this padding because the bounds is the Rect
that tightly wraps the text.
Solution 4 - Android
There's actually three different ways of measuring text.
GetTextBounds:
val paint = Paint()
paint.typeface = ResourcesCompat.getFont(context, R.font.kaushanscript)
paint.textSize = 500f
paint.color = Color.argb(255, 3, 221, 252)
val contents = "g"
val rect = Rect()
paint.getTextBounds(contents, 0, 1, rect)
val width = rect.width()
MeasureTextWidth:
val paint = Paint()
paint.typeface = ResourcesCompat.getFont(context, R.font.kaushanscript)
paint.textSize = 500f
paint.color = Color.argb(255, 3, 221, 252)
val contents = "g"
val width = paint.measureText(contents, 0, 1)
And getTextWidths:
val paint = Paint()
paint.typeface = ResourcesCompat.getFont(context, R.font.kaushanscript)
paint.textSize = 500f
paint.color = Color.argb(255, 3, 221, 252)
val contents = "g"
val rect = Rect()
val arry = FloatArray(contents.length)
paint.getTextBounds(contents, 0, contents.length, rect)
paint.getTextWidths(contents, 0, contents.length, arry)
val width = ary.sum()
Note that getTextWidths could be useful if you are trying to determine when to wrap text to the next line.
The measureTextWidth and getTextWidth are equal and have the advanced width that measure that others have posted about. Some consider this space excessive. However, this is very subjective and dependent on the font.
For example the width from measure text bounds may actually look too small:
However when adding an additional text the bounds for one letter looks normal:
Images taken from Android Developers Guide to Custom Canvas Drawing
Solution 5 - Android
Well I have done in different way:
String finalVal ="Hiren Patel";
Paint paint = new Paint();
paint.setTextSize(40);
Typeface typeface = Typeface.createFromAsset(getAssets(), "Helvetica.ttf");
paint.setTypeface(typeface);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.FILL);
Rect result = new Rect();
paint.getTextBounds(finalVal, 0, finalVal.length(), result);
Log.i("Text dimensions", "Width: "+result.width()+"-Height: "+result.height());
Hope this will help you.
Solution 6 - Android
I used the methods measureText() and getTextPath()+computeBounds() and build up an Excel with all text attributes for fixed size font that can be found under https://github.com/ArminJo/android-blue-display/blob/master/TextWidth.xlsx . There you will find also simple formulas for other text attributes like ascend etc.
The app as well as the function drawFontTest() for generating the raw values used in the excel are also available in this repo.
Solution 7 - Android
you can use "textPaint.getTextSize()" to get text width