ProfileImageLoadingDrawable.java

/*
 * Copyright (C) 2016 Eric Cochran
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.graphics.drawable.shapes.Shape;
import android.support.annotation.ColorInt;

import static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.graphics.Paint.Align.CENTER;

public final class ProfileImageLoadingDrawable extends ShapeDrawable {
  private final Paint textPaint;
  private final Rect textBounds = new Rect();
  private char[] letters;

  public ProfileImageLoadingDrawable(@ColorInt int textColor, float textSize, Typeface typeface) {
    super(new OvalShape());
    textPaint = new Paint(ANTI_ALIAS_FLAG);
    textPaint.setTextAlign(CENTER);
    textPaint.setColor(textColor);
    textPaint.setTextSize(textSize);
    textPaint.setTypeface(typeface);
  }

  public void setLetters(char... letters) {
    this.letters = letters;
    textPaint.getTextBounds(letters, 0, letters.length, textBounds);
    invalidateSelf();
  }

  @Override protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
    super.onDraw(shape, canvas, paint);
    if (letters == null) {
      return;
    }
    Rect bounds = getBounds();
    float textBottom = (bounds.height() + textBounds.height()) / 2f;
    canvas.drawText(letters, 0, letters.length, bounds.width() / 2f, textBottom, textPaint);
  }

  @Override protected void onBoundsChange(Rect bounds) {
    setIntrinsicWidth(bounds.width());
    setIntrinsicHeight(bounds.height());
    super.onBoundsChange(bounds);
  }
}