CenteredImageSpan.java

package com.bootstrap.view;

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.style.ReplacementSpan;

public class CenteredImageSpan extends ReplacementSpan {
  private final Drawable drawable;

  public CenteredImageSpan(final Drawable drawable) {
    this.drawable = drawable;
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
  }

  @Override public int getSize(final Paint paint, final CharSequence text, final int start, final int end, final Paint.FontMetricsInt fm) {
    return drawable.getIntrinsicWidth();
  }

  @Override public void draw(final Canvas canvas, final CharSequence text, final int start, final int end, final float x, final int top, final int y, final int bottom, final Paint paint) {
    final Paint.FontMetrics metrics = paint.getFontMetrics();
    final float padding = (metrics.descent - metrics.ascent - drawable.getIntrinsicHeight()) / 2f;
    final float transY = bottom - drawable.getIntrinsicHeight() - padding;
    canvas.save();
    canvas.translate(x, transY);
    drawable.draw(canvas);
    canvas.restore();
  }
}