1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.contacts.lettertiles; 18 19 import android.content.res.Resources; 20 import android.content.res.TypedArray; 21 import android.graphics.Bitmap; 22 import android.graphics.BitmapFactory; 23 import android.graphics.Canvas; 24 import android.graphics.ColorFilter; 25 import android.graphics.Paint; 26 import android.graphics.Paint.Align; 27 import android.graphics.Rect; 28 import android.graphics.Typeface; 29 import android.graphics.drawable.AdaptiveIconDrawable; 30 import android.graphics.drawable.Drawable; 31 import android.text.TextUtils; 32 33 import com.android.contacts.R; 34 35 import com.google.common.base.Preconditions; 36 37 /** 38 * A drawable that encapsulates all the functionality needed to display a letter tile to 39 * represent a contact image. 40 */ 41 public class LetterTileDrawable extends Drawable { 42 43 private final String TAG = LetterTileDrawable.class.getSimpleName(); 44 45 private final Paint mPaint; 46 47 /** Letter tile */ 48 private static TypedArray sColors; 49 private static int sDefaultColor; 50 private static int sTileFontColor; 51 private static float sLetterToTileRatio; 52 private static Bitmap DEFAULT_PERSON_AVATAR; 53 private static Bitmap DEFAULT_BUSINESS_AVATAR; 54 private static Bitmap DEFAULT_VOICEMAIL_AVATAR; 55 56 /** Reusable components to avoid new allocations */ 57 private static final Paint sPaint = new Paint(); 58 private static final Rect sRect = new Rect(); 59 private static final char[] sFirstChar = new char[1]; 60 61 /** Contact type constants */ 62 public static final int TYPE_PERSON = 1; 63 public static final int TYPE_BUSINESS = 2; 64 public static final int TYPE_VOICEMAIL = 3; 65 public static final int TYPE_DEFAULT = TYPE_PERSON; 66 67 /** 54% opacity */ 68 private static final int ALPHA = 138; 69 70 private int mContactType = TYPE_DEFAULT; 71 private float mScale = 1.0f; 72 private float mOffset = 0.0f; 73 private boolean mIsCircle = false; 74 75 private int mColor; 76 private Character mLetter = null; 77 78 public LetterTileDrawable(final Resources res) { 79 if (sColors == null) { 80 sColors = res.obtainTypedArray(R.array.letter_tile_colors); 81 sDefaultColor = res.getColor(R.color.letter_tile_default_color); 82 sTileFontColor = res.getColor(R.color.letter_tile_font_color); 83 sLetterToTileRatio = res.getFraction(R.dimen.letter_to_tile_ratio, 1, 1); 84 DEFAULT_PERSON_AVATAR = BitmapFactory.decodeResource(res, 85 R.drawable.ic_person_avatar); 86 DEFAULT_BUSINESS_AVATAR = BitmapFactory.decodeResource(res, 87 R.drawable.ic_business_white_120dp); 88 DEFAULT_VOICEMAIL_AVATAR = BitmapFactory.decodeResource(res, 89 R.drawable.ic_voicemail_avatar); 90 sPaint.setTypeface(Typeface.create( 91 res.getString(R.string.letter_tile_letter_font_family), Typeface.NORMAL)); 92 sPaint.setTextAlign(Align.CENTER); 93 sPaint.setAntiAlias(true); 94 } 95 mPaint = new Paint(); 96 mPaint.setFilterBitmap(true); 97 mPaint.setDither(true); 98 mColor = sDefaultColor; 99 } 100 101 @Override 102 public void draw(final Canvas canvas) { 103 final Rect bounds = getBounds(); 104 if (!isVisible() || bounds.isEmpty()) { 105 return; 106 } 107 // Draw letter tile. 108 drawLetterTile(canvas); 109 } 110 111 /** 112 * Draw the bitmap onto the canvas at the current bounds taking into account the current scale. 113 */ 114 private void drawBitmap(final Bitmap bitmap, final int width, final int height, 115 final Canvas canvas) { 116 // The bitmap should be drawn in the middle of the canvas without changing its width to 117 // height ratio. 118 final Rect destRect = copyBounds(); 119 120 // Crop the destination bounds into a square, scaled and offset as appropriate 121 final int halfLength = (int) (mScale * Math.min(destRect.width(), destRect.height()) / 2); 122 123 destRect.set(destRect.centerX() - halfLength, 124 (int) (destRect.centerY() - halfLength + mOffset * destRect.height()), 125 destRect.centerX() + halfLength, 126 (int) (destRect.centerY() + halfLength + mOffset * destRect.height())); 127 128 // Source rectangle remains the entire bounds of the source bitmap. 129 sRect.set(0, 0, width, height); 130 131 sPaint.setTextAlign(Align.CENTER); 132 sPaint.setAntiAlias(true); 133 sPaint.setAlpha(ALPHA); 134 135 canvas.drawBitmap(bitmap, sRect, destRect, sPaint); 136 } 137 138 private void drawLetterTile(final Canvas canvas) { 139 // Draw background color. 140 sPaint.setColor(mColor); 141 142 sPaint.setAlpha(mPaint.getAlpha()); 143 final Rect bounds = getBounds(); 144 final int minDimension = Math.min(bounds.width(), bounds.height()); 145 146 if (mIsCircle) { 147 canvas.drawCircle(bounds.centerX(), bounds.centerY(), minDimension / 2, sPaint); 148 } else { 149 canvas.drawRect(bounds, sPaint); 150 } 151 152 // Draw letter/digit only if the first character is an english letter or there's a override 153 154 if (mLetter != null) { 155 // Draw letter or digit. 156 sFirstChar[0] = mLetter; 157 158 // Scale text by canvas bounds and user selected scaling factor 159 sPaint.setTextSize(mScale * sLetterToTileRatio * minDimension); 160 sPaint.getTextBounds(sFirstChar, 0, 1, sRect); 161 sPaint.setTypeface(Typeface.create("sans-serif", Typeface.NORMAL)); 162 sPaint.setColor(sTileFontColor); 163 sPaint.setAlpha(ALPHA); 164 165 // Draw the letter in the canvas, vertically shifted up or down by the user-defined 166 // offset 167 canvas.drawText(sFirstChar, 0, 1, bounds.centerX(), 168 bounds.centerY() + mOffset * bounds.height() - sRect.exactCenterY(), 169 sPaint); 170 } else { 171 // Draw the default image if there is no letter/digit to be drawn 172 final Bitmap bitmap = getBitmapForContactType(mContactType); 173 drawBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), 174 canvas); 175 } 176 } 177 178 public int getColor() { 179 return mColor; 180 } 181 182 /** 183 * Returns a deterministic color based on the provided contact identifier string. 184 */ 185 private int pickColor(final String identifier) { 186 if (TextUtils.isEmpty(identifier) || mContactType == TYPE_VOICEMAIL) { 187 return sDefaultColor; 188 } 189 // String.hashCode() implementation is not supposed to change across java versions, so 190 // this should guarantee the same email address always maps to the same color. 191 // The email should already have been normalized by the ContactRequest. 192 final int color = Math.abs(identifier.hashCode()) % sColors.length(); 193 return sColors.getColor(color, sDefaultColor); 194 } 195 196 private static Bitmap getBitmapForContactType(int contactType) { 197 switch (contactType) { 198 case TYPE_PERSON: 199 return DEFAULT_PERSON_AVATAR; 200 case TYPE_BUSINESS: 201 return DEFAULT_BUSINESS_AVATAR; 202 case TYPE_VOICEMAIL: 203 return DEFAULT_VOICEMAIL_AVATAR; 204 default: 205 return DEFAULT_PERSON_AVATAR; 206 } 207 } 208 209 private static boolean isEnglishLetter(final char c) { 210 return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z'); 211 } 212 213 @Override 214 public void setAlpha(final int alpha) { 215 mPaint.setAlpha(alpha); 216 } 217 218 @Override 219 public void setColorFilter(final ColorFilter cf) { 220 mPaint.setColorFilter(cf); 221 } 222 223 @Override 224 public int getOpacity() { 225 return android.graphics.PixelFormat.OPAQUE; 226 } 227 228 /** 229 * Scale the drawn letter tile to a ratio of its default size 230 * 231 * @param scale The ratio the letter tile should be scaled to as a percentage of its default 232 * size, from a scale of 0 to 2.0f. The default is 1.0f. 233 */ 234 public LetterTileDrawable setScale(float scale) { 235 mScale = scale; 236 return this; 237 } 238 239 /** 240 * Assigns the vertical offset of the position of the letter tile to the ContactDrawable 241 * 242 * @param offset The provided offset must be within the range of -0.5f to 0.5f. 243 * If set to -0.5f, the letter will be shifted upwards by 0.5 times the height of the canvas 244 * it is being drawn on, which means it will be drawn with the center of the letter starting 245 * at the top edge of the canvas. 246 * If set to 0.5f, the letter will be shifted downwards by 0.5 times the height of the canvas 247 * it is being drawn on, which means it will be drawn with the center of the letter starting 248 * at the bottom edge of the canvas. 249 * The default is 0.0f. 250 */ 251 public LetterTileDrawable setOffset(float offset) { 252 Preconditions.checkArgument(offset >= -0.5f && offset <= 0.5f); 253 mOffset = offset; 254 return this; 255 } 256 257 public LetterTileDrawable setLetter(Character letter){ 258 mLetter = letter; 259 return this; 260 } 261 262 public LetterTileDrawable setColor(int color){ 263 mColor = color; 264 return this; 265 } 266 267 public LetterTileDrawable setLetterAndColorFromContactDetails(final String displayName, 268 final String identifier) { 269 if (displayName != null && displayName.length() > 0 270 && isEnglishLetter(displayName.charAt(0))) { 271 mLetter = Character.toUpperCase(displayName.charAt(0)); 272 }else{ 273 mLetter = null; 274 } 275 mColor = pickColor(identifier); 276 return this; 277 } 278 279 public LetterTileDrawable setContactType(int contactType) { 280 mContactType = contactType; 281 return this; 282 } 283 284 public LetterTileDrawable setIsCircular(boolean isCircle) { 285 mIsCircle = isCircle; 286 return this; 287 } 288 289 /** 290 * Returns the scale percentage as a float for LetterTileDrawables used in AdaptiveIcons. 291 */ 292 public static float getAdaptiveIconScale() { 293 return 1 / (1 + (2 * AdaptiveIconDrawable.getExtraInsetFraction())); 294 } 295 } 296
