TypedValue.java revision 8aca9e335f9b2eb060878b2e6cbe241928d83dc9
1/* 2 * Copyright (C) 2007 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 17package android.util; 18 19/** 20 * Container for a dynamically typed data value. Primarily used with 21 * {@link android.content.res.Resources} for holding resource values. 22 */ 23public class TypedValue { 24 /** The value contains no data. */ 25 public static final int TYPE_NULL = 0x00; 26 27 /** The <var>data</var> field holds a resource identifier. */ 28 public static final int TYPE_REFERENCE = 0x01; 29 /** The <var>data</var> field holds an attribute resource 30 * identifier (referencing an attribute in the current theme 31 * style, not a resource entry). */ 32 public static final int TYPE_ATTRIBUTE = 0x02; 33 /** The <var>string</var> field holds string data. In addition, if 34 * <var>data</var> is non-zero then it is the string block 35 * index of the string and <var>assetCookie</var> is the set of 36 * assets the string came from. */ 37 public static final int TYPE_STRING = 0x03; 38 /** The <var>data</var> field holds an IEEE 754 floating point number. */ 39 public static final int TYPE_FLOAT = 0x04; 40 /** The <var>data</var> field holds a complex number encoding a 41 * dimension value. */ 42 public static final int TYPE_DIMENSION = 0x05; 43 /** The <var>data</var> field holds a complex number encoding a fraction 44 * of a container. */ 45 public static final int TYPE_FRACTION = 0x06; 46 47 /** Identifies the start of plain integer values. Any type value 48 * from this to {@link #TYPE_LAST_INT} means the 49 * <var>data</var> field holds a generic integer value. */ 50 public static final int TYPE_FIRST_INT = 0x10; 51 52 /** The <var>data</var> field holds a number that was 53 * originally specified in decimal. */ 54 public static final int TYPE_INT_DEC = 0x10; 55 /** The <var>data</var> field holds a number that was 56 * originally specified in hexadecimal (0xn). */ 57 public static final int TYPE_INT_HEX = 0x11; 58 /** The <var>data</var> field holds 0 or 1 that was originally 59 * specified as "false" or "true". */ 60 public static final int TYPE_INT_BOOLEAN = 0x12; 61 62 /** Identifies the start of integer values that were specified as 63 * color constants (starting with '#'). */ 64 public static final int TYPE_FIRST_COLOR_INT = 0x1c; 65 66 /** The <var>data</var> field holds a color that was originally 67 * specified as #aarrggbb. */ 68 public static final int TYPE_INT_COLOR_ARGB8 = 0x1c; 69 /** The <var>data</var> field holds a color that was originally 70 * specified as #rrggbb. */ 71 public static final int TYPE_INT_COLOR_RGB8 = 0x1d; 72 /** The <var>data</var> field holds a color that was originally 73 * specified as #argb. */ 74 public static final int TYPE_INT_COLOR_ARGB4 = 0x1e; 75 /** The <var>data</var> field holds a color that was originally 76 * specified as #rgb. */ 77 public static final int TYPE_INT_COLOR_RGB4 = 0x1f; 78 79 /** Identifies the end of integer values that were specified as color 80 * constants. */ 81 public static final int TYPE_LAST_COLOR_INT = 0x1f; 82 83 /** Identifies the end of plain integer values. */ 84 public static final int TYPE_LAST_INT = 0x1f; 85 86 /* ------------------------------------------------------------ */ 87 88 /** Complex data: bit location of unit information. */ 89 public static final int COMPLEX_UNIT_SHIFT = 0; 90 /** Complex data: mask to extract unit information (after shifting by 91 * {@link #COMPLEX_UNIT_SHIFT}). This gives us 16 possible types, as 92 * defined below. */ 93 public static final int COMPLEX_UNIT_MASK = 0xf; 94 95 /** {@link #TYPE_DIMENSION} complex unit: Value is raw pixels. */ 96 public static final int COMPLEX_UNIT_PX = 0; 97 /** {@link #TYPE_DIMENSION} complex unit: Value is Device Independent 98 * Pixels. */ 99 public static final int COMPLEX_UNIT_DIP = 1; 100 /** {@link #TYPE_DIMENSION} complex unit: Value is a scaled pixel. */ 101 public static final int COMPLEX_UNIT_SP = 2; 102 /** {@link #TYPE_DIMENSION} complex unit: Value is in points. */ 103 public static final int COMPLEX_UNIT_PT = 3; 104 /** {@link #TYPE_DIMENSION} complex unit: Value is in inches. */ 105 public static final int COMPLEX_UNIT_IN = 4; 106 /** {@link #TYPE_DIMENSION} complex unit: Value is in millimeters. */ 107 public static final int COMPLEX_UNIT_MM = 5; 108 109 /** {@link #TYPE_FRACTION} complex unit: A basic fraction of the overall 110 * size. */ 111 public static final int COMPLEX_UNIT_FRACTION = 0; 112 /** {@link #TYPE_FRACTION} complex unit: A fraction of the parent size. */ 113 public static final int COMPLEX_UNIT_FRACTION_PARENT = 1; 114 115 /** Complex data: where the radix information is, telling where the decimal 116 * place appears in the mantissa. */ 117 public static final int COMPLEX_RADIX_SHIFT = 4; 118 /** Complex data: mask to extract radix information (after shifting by 119 * {@link #COMPLEX_RADIX_SHIFT}). This give us 4 possible fixed point 120 * representations as defined below. */ 121 public static final int COMPLEX_RADIX_MASK = 0x3; 122 123 /** Complex data: the mantissa is an integral number -- i.e., 0xnnnnnn.0 */ 124 public static final int COMPLEX_RADIX_23p0 = 0; 125 /** Complex data: the mantissa magnitude is 16 bits -- i.e, 0xnnnn.nn */ 126 public static final int COMPLEX_RADIX_16p7 = 1; 127 /** Complex data: the mantissa magnitude is 8 bits -- i.e, 0xnn.nnnn */ 128 public static final int COMPLEX_RADIX_8p15 = 2; 129 /** Complex data: the mantissa magnitude is 0 bits -- i.e, 0x0.nnnnnn */ 130 public static final int COMPLEX_RADIX_0p23 = 3; 131 132 /** Complex data: bit location of mantissa information. */ 133 public static final int COMPLEX_MANTISSA_SHIFT = 8; 134 /** Complex data: mask to extract mantissa information (after shifting by 135 * {@link #COMPLEX_MANTISSA_SHIFT}). This gives us 23 bits of precision; 136 * the top bit is the sign. */ 137 public static final int COMPLEX_MANTISSA_MASK = 0xffffff; 138 139 /* ------------------------------------------------------------ */ 140 141 /** 142 * If {@link #density} is equal to this value, then the density should be 143 * treated as the system's default density value: {@link DisplayMetrics#DENSITY_DEFAULT}. 144 */ 145 public static final int DENSITY_DEFAULT = 0; 146 147 /** 148 * If {@link #density} is equal to this value, then there is no density 149 * associated with the resource and it should not be scaled. 150 */ 151 public static final int DENSITY_NONE = 0xffff; 152 153 /* ------------------------------------------------------------ */ 154 155 /** The type held by this value, as defined by the constants here. 156 * This tells you how to interpret the other fields in the object. */ 157 public int type; 158 159 /** If the value holds a string, this is it. */ 160 public CharSequence string; 161 162 /** Basic data in the value, interpreted according to {@link #type} */ 163 public int data; 164 165 /** Additional information about where the value came from; only 166 * set for strings. */ 167 public int assetCookie; 168 169 /** If Value came from a resource, this holds the corresponding resource id. */ 170 public int resourceId; 171 172 /** If Value came from a resource, these are the configurations for which 173 * its contents can change. */ 174 public int changingConfigurations = -1; 175 176 /** 177 * If the Value came from a resource, this holds the corresponding pixel density. 178 * */ 179 public int density; 180 181 /* ------------------------------------------------------------ */ 182 183 /** Return the data for this value as a float. Only use for values 184 * whose type is {@link #TYPE_FLOAT}. */ 185 public final float getFloat() { 186 return Float.intBitsToFloat(data); 187 } 188 189 private static final float MANTISSA_MULT = 190 1.0f / (1<<TypedValue.COMPLEX_MANTISSA_SHIFT); 191 private static final float[] RADIX_MULTS = new float[] { 192 1.0f*MANTISSA_MULT, 1.0f/(1<<7)*MANTISSA_MULT, 193 1.0f/(1<<15)*MANTISSA_MULT, 1.0f/(1<<23)*MANTISSA_MULT 194 }; 195 196 /** 197 * Retrieve the base value from a complex data integer. This uses the 198 * {@link #COMPLEX_MANTISSA_MASK} and {@link #COMPLEX_RADIX_MASK} fields of 199 * the data to compute a floating point representation of the number they 200 * describe. The units are ignored. 201 * 202 * @param complex A complex data value. 203 * 204 * @return A floating point value corresponding to the complex data. 205 */ 206 public static float complexToFloat(int complex) 207 { 208 return (complex&(TypedValue.COMPLEX_MANTISSA_MASK 209 <<TypedValue.COMPLEX_MANTISSA_SHIFT)) 210 * RADIX_MULTS[(complex>>TypedValue.COMPLEX_RADIX_SHIFT) 211 & TypedValue.COMPLEX_RADIX_MASK]; 212 } 213 214 /** 215 * Converts a complex data value holding a dimension to its final floating 216 * point value. The given <var>data</var> must be structured as a 217 * {@link #TYPE_DIMENSION}. 218 * 219 * @param data A complex data value holding a unit, magnitude, and 220 * mantissa. 221 * @param metrics Current display metrics to use in the conversion -- 222 * supplies display density and scaling information. 223 * 224 * @return The complex floating point value multiplied by the appropriate 225 * metrics depending on its unit. 226 */ 227 public static float complexToDimension(int data, DisplayMetrics metrics) 228 { 229 return applyDimension( 230 (data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK, 231 complexToFloat(data), 232 metrics); 233 } 234 235 /** 236 * Converts a complex data value holding a dimension to its final value 237 * as an integer pixel offset. This is the same as 238 * {@link #complexToDimension}, except the raw floating point value is 239 * truncated to an integer (pixel) value. 240 * The given <var>data</var> must be structured as a 241 * {@link #TYPE_DIMENSION}. 242 * 243 * @param data A complex data value holding a unit, magnitude, and 244 * mantissa. 245 * @param metrics Current display metrics to use in the conversion -- 246 * supplies display density and scaling information. 247 * 248 * @return The number of pixels specified by the data and its desired 249 * multiplier and units. 250 */ 251 public static int complexToDimensionPixelOffset(int data, 252 DisplayMetrics metrics) 253 { 254 return (int)applyDimension( 255 (data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK, 256 complexToFloat(data), 257 metrics); 258 } 259 260 /** 261 * Converts a complex data value holding a dimension to its final value 262 * as an integer pixel size. This is the same as 263 * {@link #complexToDimension}, except the raw floating point value is 264 * converted to an integer (pixel) value for use as a size. A size 265 * conversion involves rounding the base value, and ensuring that a 266 * non-zero base value is at least one pixel in size. 267 * The given <var>data</var> must be structured as a 268 * {@link #TYPE_DIMENSION}. 269 * 270 * @param data A complex data value holding a unit, magnitude, and 271 * mantissa. 272 * @param metrics Current display metrics to use in the conversion -- 273 * supplies display density and scaling information. 274 * 275 * @return The number of pixels specified by the data and its desired 276 * multiplier and units. 277 */ 278 public static int complexToDimensionPixelSize(int data, 279 DisplayMetrics metrics) 280 { 281 final float value = complexToFloat(data); 282 final float f = applyDimension( 283 (data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK, 284 value, 285 metrics); 286 final int res = (int)(f+0.5f); 287 if (res != 0) return res; 288 if (value == 0) return 0; 289 if (value > 0) return 1; 290 return -1; 291 } 292 293 /** 294 * @hide Was accidentally exposed in API level 1 for debugging purposes. 295 * Kept for compatibility just in case although the debugging code has been removed. 296 */ 297 @Deprecated 298 public static float complexToDimensionNoisy(int data, DisplayMetrics metrics) 299 { 300 return complexToDimension(data, metrics); 301 } 302 303 /** 304 * Converts an unpacked complex data value holding a dimension to its final floating 305 * point value. The two parameters <var>unit</var> and <var>value</var> 306 * are as in {@link #TYPE_DIMENSION}. 307 * 308 * @param unit The unit to convert from. 309 * @param value The value to apply the unit to. 310 * @param metrics Current display metrics to use in the conversion -- 311 * supplies display density and scaling information. 312 * 313 * @return The complex floating point value multiplied by the appropriate 314 * metrics depending on its unit. 315 */ 316 public static float applyDimension(int unit, float value, 317 DisplayMetrics metrics) 318 { 319 switch (unit) { 320 case COMPLEX_UNIT_PX: 321 return value; 322 case COMPLEX_UNIT_DIP: 323 return value * metrics.density; 324 case COMPLEX_UNIT_SP: 325 return value * metrics.scaledDensity; 326 case COMPLEX_UNIT_PT: 327 return value * metrics.xdpi * (1.0f/72); 328 case COMPLEX_UNIT_IN: 329 return value * metrics.xdpi; 330 case COMPLEX_UNIT_MM: 331 return value * metrics.xdpi * (1.0f/25.4f); 332 } 333 return 0; 334 } 335 336 /** 337 * Return the data for this value as a dimension. Only use for values 338 * whose type is {@link #TYPE_DIMENSION}. 339 * 340 * @param metrics Current display metrics to use in the conversion -- 341 * supplies display density and scaling information. 342 * 343 * @return The complex floating point value multiplied by the appropriate 344 * metrics depending on its unit. 345 */ 346 public float getDimension(DisplayMetrics metrics) 347 { 348 return complexToDimension(data, metrics); 349 } 350 351 /** 352 * Converts a complex data value holding a fraction to its final floating 353 * point value. The given <var>data</var> must be structured as a 354 * {@link #TYPE_FRACTION}. 355 * 356 * @param data A complex data value holding a unit, magnitude, and 357 * mantissa. 358 * @param base The base value of this fraction. In other words, a 359 * standard fraction is multiplied by this value. 360 * @param pbase The parent base value of this fraction. In other 361 * words, a parent fraction (nn%p) is multiplied by this 362 * value. 363 * 364 * @return The complex floating point value multiplied by the appropriate 365 * base value depending on its unit. 366 */ 367 public static float complexToFraction(int data, float base, float pbase) 368 { 369 switch ((data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK) { 370 case COMPLEX_UNIT_FRACTION: 371 return complexToFloat(data) * base; 372 case COMPLEX_UNIT_FRACTION_PARENT: 373 return complexToFloat(data) * pbase; 374 } 375 return 0; 376 } 377 378 /** 379 * Return the data for this value as a fraction. Only use for values whose 380 * type is {@link #TYPE_FRACTION}. 381 * 382 * @param base The base value of this fraction. In other words, a 383 * standard fraction is multiplied by this value. 384 * @param pbase The parent base value of this fraction. In other 385 * words, a parent fraction (nn%p) is multiplied by this 386 * value. 387 * 388 * @return The complex floating point value multiplied by the appropriate 389 * base value depending on its unit. 390 */ 391 public float getFraction(float base, float pbase) 392 { 393 return complexToFraction(data, base, pbase); 394 } 395 396 /** 397 * Regardless of the actual type of the value, try to convert it to a 398 * string value. For example, a color type will be converted to a 399 * string of the form #aarrggbb. 400 * 401 * @return CharSequence The coerced string value. If the value is 402 * null or the type is not known, null is returned. 403 */ 404 public final CharSequence coerceToString() 405 { 406 int t = type; 407 if (t == TYPE_STRING) { 408 return string; 409 } 410 return coerceToString(t, data); 411 } 412 413 private static final String[] DIMENSION_UNIT_STRS = new String[] { 414 "px", "dip", "sp", "pt", "in", "mm" 415 }; 416 private static final String[] FRACTION_UNIT_STRS = new String[] { 417 "%", "%p" 418 }; 419 420 /** 421 * Perform type conversion as per {@link #coerceToString()} on an 422 * explicitly supplied type and data. 423 * 424 * @param type The data type identifier. 425 * @param data The data value. 426 * 427 * @return String The coerced string value. If the value is 428 * null or the type is not known, null is returned. 429 */ 430 public static final String coerceToString(int type, int data) 431 { 432 switch (type) { 433 case TYPE_NULL: 434 return null; 435 case TYPE_REFERENCE: 436 return "@" + data; 437 case TYPE_ATTRIBUTE: 438 return "?" + data; 439 case TYPE_FLOAT: 440 return Float.toString(Float.intBitsToFloat(data)); 441 case TYPE_DIMENSION: 442 return Float.toString(complexToFloat(data)) + DIMENSION_UNIT_STRS[ 443 (data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK]; 444 case TYPE_FRACTION: 445 return Float.toString(complexToFloat(data)*100) + FRACTION_UNIT_STRS[ 446 (data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK]; 447 case TYPE_INT_HEX: 448 return "0x" + Integer.toHexString(data); 449 case TYPE_INT_BOOLEAN: 450 return data != 0 ? "true" : "false"; 451 } 452 453 if (type >= TYPE_FIRST_COLOR_INT && type <= TYPE_LAST_COLOR_INT) { 454 return "#" + Integer.toHexString(data); 455 } else if (type >= TYPE_FIRST_INT && type <= TYPE_LAST_INT) { 456 return Integer.toString(data); 457 } 458 459 return null; 460 } 461 462 public void setTo(TypedValue other) 463 { 464 type = other.type; 465 string = other.string; 466 data = other.data; 467 assetCookie = other.assetCookie; 468 resourceId = other.resourceId; 469 density = other.density; 470 } 471 472 public String toString() 473 { 474 StringBuilder sb = new StringBuilder(); 475 sb.append("TypedValue{t=0x").append(Integer.toHexString(type)); 476 sb.append("/d=0x").append(Integer.toHexString(data)); 477 if (type == TYPE_STRING) { 478 sb.append(" \"").append(string != null ? string : "<null>").append("\""); 479 } 480 if (assetCookie != 0) { 481 sb.append(" a=").append(assetCookie); 482 } 483 if (resourceId != 0) { 484 sb.append(" r=0x").append(Integer.toHexString(resourceId)); 485 } 486 sb.append("}"); 487 return sb.toString(); 488 } 489}; 490 491