Auto Scale Text Size

Question

I'm looking for a way to when I change a screen size it will proportionally resize the text. Currently I tried Auto Scale TextView Text to Fit within Bounds but it doesn't seems to be working. but I'm not sure I do it the right way or not. I'm now currently calling by

AutoResizeTextView test = new AutoResizeTextView(this);
test=(AutoResizeTextView)findViewById(R.id.test456);
test.resizeText(); // I call this to resize.. am I right?

XML

<com.mypackage.AutoResizeTextView
android:id="@+id/test456"
android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:layout_weight="1"  />

score 37 · Accepted Answer · answered Mar 15 '12 at 04:55

You don't need to call AutoResizeTextView test, you can say TextView since the class extends TextView. I don't see why you'd need to call resizeText() either.

Either way, here's a custom class I like to use to auto re-size text.

public class AutoFitTextView extends TextView {

public AutoFitTextView(Context context) {
    super(context);
    init();
}

public AutoFitTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

private void init() {

    maxTextSize = this.getTextSize();
    if (maxTextSize < 35) {
        maxTextSize = 30;
    }
    minTextSize = 20;
}

private void refitText(String text, int textWidth) {
    if (textWidth > 0) {
        int availableWidth = textWidth - this.getPaddingLeft()
                - this.getPaddingRight();
        float trySize = maxTextSize;

        this.setTextSize(TypedValue.COMPLEX_UNIT_PX, trySize);
        while ((trySize > minTextSize)
                && (this.getPaint().measureText(text) > availableWidth)) {
            trySize -= 1;
            if (trySize <= minTextSize) {
                trySize = minTextSize;
                break;
            }
            this.setTextSize(TypedValue.COMPLEX_UNIT_PX, trySize);
        }
        this.setTextSize(TypedValue.COMPLEX_UNIT_PX, 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);
    }
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
    refitText(this.getText().toString(), parentWidth);
}

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;
}

private float minTextSize;
private float maxTextSize;

}

i'm calling via another class so i need to call tt am i right? Is it that all i need is to go layout xml n use the custom class as header? — I Yeu C, Mar 15 '12 at 05:29
It seems like you got it, but to be clear; you add the custom class in your XML in place of `TextView`, then in your code you reference it like a normal `TextView`. — adneal, Mar 15 '12 at 06:55
so that means I call TextView tv = new TextView(this); rather than AutoFitTextView tv = new AutoFitTextView(this); .. Am I right to say that? — I Yeu C, Mar 15 '12 at 09:22
@Noman, just replace at the layout.xml "TextView" to "yourpackage.AutoFitTextView". It works perfect for me!!! Very clear and effective code :D — xarlymg89, Jan 09 '13 at 18:41
awesome! saved me alot of time! don't forget to add some padding left & right, otherwise the text might still be cut off at the right end! — dy_, Jul 08 '13 at 16:27

score 4 · Answer 2 · answered Mar 21 '17 at 22:53

4

Good news! Google introduced Autosizing TextView support in Android O. It will be also included in support librararies.

https://developer.android.com/preview/features/autosizing-textview.html

answered Mar 21 '17 at 22:53

Tom Wayne

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score 2 · Answer 3 · answered Jun 12 '14 at 17:24

I use this, proportionally at the width of the screen.

DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        width_screen=displaymetrics.widthPixels;
Mytext.setTextSize(TypedValue.COMPLEX_UNIT_PX, (width_screen/CONST));

the CONST is a number I use for to scale the font, in the dimension I want. It works for my needs.

Auto Scale Text Size

3 Answers3

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