안드로이드 - TextView 자동 사이즈 조절

http://jeffreysambells.com/posts/2010/04/04/android-textview-with-auto-sized-content/

public class TextFitTextView extends TextView {

    static final String TAG = "TextFitTextView";
    boolean fit = false;

    public TextFitTextView(Context context) {
        super(context);
    }

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

    public TextFitTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void setFitTextToBox( Boolean fit ) {
        this.fit = fit;
    }

    protected void onDraw (Canvas canvas) {
        super.onDraw(canvas);
        if (fit) _shrinkToFit();
    }

    protected void _shrinkToFit() {

        int height = this.getHeight();
        int lines = this.getLineCount();
        Rect r = new Rect();
        int y1 = this.getLineBounds(0, r);
        int y2 = this.getLineBounds(lines-1, r);

        float size = this.getTextSize();
        if (y2 > height && size >= 8.0f) {
            this.setTextSize(size - 2.0f);
            _shrinkToFit();
        }

    }
}

<!-- TextView wrapped in the custom LinearLayout that expects one child TextView -->
<!-- This view should specify the size you would want the text view to be displayed at -->
<com.custom.ResizeView
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:layout_margin="10dp"
    android:layout_weight="1"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/CustomTextView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
</com.custom.ResizeView>

public class ResizeView extends LinearLayout {

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

    public ResizeView(Context context) {
        super(context);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        // oldWidth used as a fixed width when measuring the size of the text
        // view at different font sizes
        final int oldWidth = getMeasuredWidth() - getPaddingBottom() - getPaddingTop();
        final int oldHeight = getMeasuredHeight() - getPaddingLeft() - getPaddingRight();

        // Assume we only have one child and it is the text view to scale
        TextView textView = (TextView) getChildAt(0);

        // This is the maximum font size... we iterate down from this
        // I've specified the sizes in pixels, but sp can be used, just modify
        // the call to setTextSize

        float size = getResources().getDimensionPixelSize(R.dimen.solutions_view_max_font_size);

        for (int textViewHeight = Integer.MAX_VALUE; textViewHeight > oldHeight; size -= 0.1f) {
            textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);

            // measure the text views size using a fixed width and an
            // unspecified height - the unspecified height means measure
            // returns the textviews ideal height
            textView.measure(MeasureSpec.makeMeasureSpec(oldWidth, MeasureSpec.EXACTLY), MeasureSpec.UNSPECIFIED);

            textViewHeight = textView.getMeasuredHeight();
        }
    }
}