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 Te

Answer 1

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 < 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 > 0) {
            int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
            float trySize = maxTextSize;

            testPaint.setTextSize(trySize);
            while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth)) {
                trySize -= 1;
                if (trySize <= 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;

}