Android Open Source - GridListViewAdapters Character Drawable

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright 2014-present Biraj Patel/*  w  w w .j a  v  a2  s. c o m*/
 * 
 * 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.
 */
package com.birin.gridlistviewadaptersdemo.common;

import android.annotation.SuppressLint;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.ColorDrawable;
import android.os.Build;
import android.widget.ImageView;

public class CharacterDrawable extends ColorDrawable {

  private char character;
  private int color;
  private final Paint textPaint;

  public CharacterDrawable(CharacterDrawableInfo info) {
    super(info.color);
    color = info.color;
    character = info.newChar;
    textPaint = new Paint();
    textPaint.setColor(Color.BLACK);
    textPaint.setStyle(Paint.Style.FILL);
    textPaint.setTextAlign(Paint.Align.CENTER);
    textPaint.setAntiAlias(true);
    textPaint.setFakeBoldText(true);
  }

  @Override
  public void draw(Canvas canvas) {
    super.draw(canvas);

    // draw text
    int width = canvas.getWidth();
    int height = canvas.getHeight();
    textPaint.setTextSize(height / 2);
    canvas.drawText(String.valueOf(character), width / 2, height / 2
        - ((textPaint.descent() + textPaint.ascent()) / 2), textPaint);
  }

  @Override
  public void setAlpha(int alpha) {
    textPaint.setAlpha(alpha);
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
    textPaint.setColorFilter(cf);
  }

  @Override
  public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
  }

  public void update(CharacterDrawableInfo info) {
    if (info.newChar != character || info.color != color) {
      character = info.newChar;
      this.color = info.color;
      setColor(color);
      invalidateSelf();
    }
  }

  @SuppressLint("NewApi")
  @SuppressWarnings("deprecation")
  public static void tagNewDrawableToImageView(ImageView imageview) {
    CharacterDrawable drawable = new CharacterDrawable(
        new CharacterDrawableInfo());
    imageview.setTag(drawable);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
      imageview.setBackground(drawable);
    } else {
      imageview.setBackgroundDrawable(drawable);
    }
  }

  public static void updateTaggedDrawableStateFromImageView(
      ImageView imageview, CharacterDrawableInfo info) {
    CharacterDrawable drawable = (CharacterDrawable) imageview.getTag();
    drawable.update(info);
  }

  public static class CharacterDrawableInfo {
    public int color;
    public char newChar;
  }
}

Java Source Code List