下面列出了android.util.TypedValue#TYPE_ATTRIBUTE 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Retrieve a dimensional unit attribute at <var>index</var> for use
* as an offset in raw pixels. This is the same as
* {@link TypedArray#getDimension}, except the returned value is converted to
* integer pixels for you. An offset conversion involves simply
* truncating the base value to an integer.
* <p/>
* Retrieve from extracted first if no value than tries from {@link TypedArray}
*
* @param index Index of attribute to retrieve.
* @param def Value to return if the attribute is not defined or
* not a resource.
* @return Attribute dimension value multiplied by the appropriate
* metric and truncated to integer pixels, or defValue if not defined.
* @see TypedArray#getDimension
* @see TypedArray#getDimensionPixelSize
*/
public static int getDimensionPixelOffset(Resources.Theme theme, TypedArray a, TypedValue[] values,
int index, int def) {
if (values != null && theme != null) {
TypedValue v = values[index];
if (v.type == TypedValue.TYPE_ATTRIBUTE) {
TEMP_ARRAY[0] = v.data;
TypedArray tmp = theme.obtainStyledAttributes(null, TEMP_ARRAY, 0, 0);
try {
return tmp.getDimensionPixelOffset(0, def);
} finally {
tmp.recycle();
}
}
}
if (a != null) {
return a.getDimensionPixelOffset(index, def);
}
return def;
}
/**
* Retrieve a dimensional unit attribute at <var>index</var>. Unit
* conversions are based on the current {@link DisplayMetrics}
* associated with the resources this {@link TypedArray} object
* came from.
* <p>
* This method will throw an exception if the attribute is defined but is
* not a dimension.
*
* @param index Index of attribute to retrieve.
* @param defValue Value to return if the attribute is not defined or
* not a resource.
*
* @return Attribute dimension value multiplied by the appropriate
* metric, or defValue if not defined.
* @throws RuntimeException if the TypedArray has already been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not an integer.
*
* @see #getDimensionPixelOffset
* @see #getDimensionPixelSize
*/
public float getDimension(@StyleableRes int index, float defValue) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final int attrIndex = index;
index *= STYLE_NUM_ENTRIES;
final int[] data = mData;
final int type = data[index + STYLE_TYPE];
if (type == TypedValue.TYPE_NULL) {
return defValue;
} else if (type == TypedValue.TYPE_DIMENSION) {
return TypedValue.complexToDimension(data[index + STYLE_DATA], mMetrics);
} else if (type == TypedValue.TYPE_ATTRIBUTE) {
final TypedValue value = mValue;
getValueAt(index, value);
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + attrIndex + ": " + value);
}
throw new UnsupportedOperationException("Can't convert value at index " + attrIndex
+ " to dimension: type=0x" + Integer.toHexString(type));
}
/**
* Retrieve a dimensional unit attribute at <var>index</var> for use
* as an offset in raw pixels. This is the same as
* {@link #getDimension}, except the returned value is converted to
* integer pixels for you. An offset conversion involves simply
* truncating the base value to an integer.
* <p>
* This method will throw an exception if the attribute is defined but is
* not a dimension.
*
* @param index Index of attribute to retrieve.
* @param defValue Value to return if the attribute is not defined or
* not a resource.
*
* @return Attribute dimension value multiplied by the appropriate
* metric and truncated to integer pixels, or defValue if not defined.
* @throws RuntimeException if the TypedArray has already been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not an integer.
*
* @see #getDimension
* @see #getDimensionPixelSize
*/
public int getDimensionPixelOffset(@StyleableRes int index, int defValue) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final int attrIndex = index;
index *= STYLE_NUM_ENTRIES;
final int[] data = mData;
final int type = data[index + STYLE_TYPE];
if (type == TypedValue.TYPE_NULL) {
return defValue;
} else if (type == TypedValue.TYPE_DIMENSION) {
return TypedValue.complexToDimensionPixelOffset(data[index + STYLE_DATA], mMetrics);
} else if (type == TypedValue.TYPE_ATTRIBUTE) {
final TypedValue value = mValue;
getValueAt(index, value);
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + attrIndex + ": " + value);
}
throw new UnsupportedOperationException("Can't convert value at index " + attrIndex
+ " to dimension: type=0x" + Integer.toHexString(type));
}
/**
* Retrieve the resource identifier for the attribute at
* <var>index</var>. Note that attribute resource as resolved when
* the overall {@link TypedArray} object is retrieved. As a result, this function will return
* the resource identifier of the final resource value that was found, <em>not</em> necessarily
* the original resource that was specified by the attribute.
*
* @param index Index of attribute to retrieve.
* @param def Value to return if the attribute is not defined or not a resource.
* @return Attribute resource identifier, or defValue if not defined.
*/
public static int getResourceId(Resources.Theme theme, TypedArray a, TypedValue[] values, int index, int def) {
if (values != null && theme != null) {
TypedValue v = values[index];
if (v.type == TypedValue.TYPE_ATTRIBUTE) {
TEMP_ARRAY[0] = v.data;
TypedArray tmp = theme.obtainStyledAttributes(null, TEMP_ARRAY, 0, 0);
try {
return tmp.getResourceId(0, def);
} finally {
tmp.recycle();
}
}
}
if (a != null) {
return a.getResourceId(index, def);
}
return def;
}
/**
* Special version of {@link #getDimensionPixelSize} for retrieving
* {@link android.view.ViewGroup}'s layout_width and layout_height
* attributes. This is only here for performance reasons; applications
* should use {@link #getDimensionPixelSize}.
* <p>
* This method will throw an exception if the attribute is defined but is
* not a dimension or integer (enum).
*
* @param index Index of the attribute to retrieve.
* @param name Textual name of attribute for error reporting.
*
* @return Attribute dimension value multiplied by the appropriate
* metric and truncated to integer pixels.
* @throws RuntimeException if the TypedArray has already been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not a dimension or integer (enum).
*/
public int getLayoutDimension(@StyleableRes int index, String name) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final int attrIndex = index;
index *= STYLE_NUM_ENTRIES;
final int[] data = mData;
final int type = data[index + STYLE_TYPE];
if (type >= TypedValue.TYPE_FIRST_INT
&& type <= TypedValue.TYPE_LAST_INT) {
return data[index + STYLE_DATA];
} else if (type == TypedValue.TYPE_DIMENSION) {
return TypedValue.complexToDimensionPixelSize(data[index + STYLE_DATA], mMetrics);
} else if (type == TypedValue.TYPE_ATTRIBUTE) {
final TypedValue value = mValue;
getValueAt(index, value);
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + attrIndex + ": " + value);
}
throw new UnsupportedOperationException(getPositionDescription()
+ ": You must supply a " + name + " attribute.");
}
/**
* Retrieves a fractional unit attribute at <var>index</var>.
*
* @param index Index of attribute to retrieve.
* @param base The base value of this fraction. In other words, a
* standard fraction is multiplied by this value.
* @param pbase The parent base value of this fraction. In other
* words, a parent fraction (nn%p) is multiplied by this
* value.
* @param defValue Value to return if the attribute is not defined or
* not a resource.
*
* @return Attribute fractional value multiplied by the appropriate
* base value, or defValue if not defined.
* @throws RuntimeException if the TypedArray has already been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not a fraction.
*/
public float getFraction(@StyleableRes int index, int base, int pbase, float defValue) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final int attrIndex = index;
index *= STYLE_NUM_ENTRIES;
final int[] data = mData;
final int type = data[index + STYLE_TYPE];
if (type == TypedValue.TYPE_NULL) {
return defValue;
} else if (type == TypedValue.TYPE_FRACTION) {
return TypedValue.complexToFraction(data[index + STYLE_DATA], base, pbase);
} else if (type == TypedValue.TYPE_ATTRIBUTE) {
final TypedValue value = mValue;
getValueAt(index, value);
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + attrIndex + ": " + value);
}
throw new UnsupportedOperationException("Can't convert value at index " + attrIndex
+ " to fraction: type=0x" + Integer.toHexString(type));
}
/**
* Retrieve the ColorStateList for the attribute at <var>index</var>.
* The value may be either a single solid color or a reference to
* a color or complex {@link ColorStateList} description.
*
* @param index Index of attribute to retrieve.
* @return ColorStateList for the attribute, or null if not defined.
*/
public static ColorStateList getColorStateList(Resources.Theme theme, TypedArray a,
TypedValue[] values, int index) {
if (values != null && theme != null) {
TypedValue v = values[index];
if (v.type == TypedValue.TYPE_ATTRIBUTE) {
TEMP_ARRAY[0] = v.data;
TypedArray tmp = theme.obtainStyledAttributes(null, TEMP_ARRAY, 0, 0);
try {
return tmp.getColorStateList(0);
} finally {
tmp.recycle();
}
}
}
if (a != null) {
return a.getColorStateList(index);
}
return null;
}
/**
* Version of {@link #getDrawable(int)} that accepts an override density.
* @hide
*/
@Nullable
public Drawable getDrawableForDensity(@StyleableRes int index, int density) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final TypedValue value = mValue;
if (getValueAt(index * STYLE_NUM_ENTRIES, value)) {
if (value.type == TypedValue.TYPE_ATTRIBUTE) {
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + index + ": " + value);
}
if (density > 0) {
// If the density is overridden, the value in the TypedArray will not reflect this.
// Do a separate lookup of the resourceId with the density override.
mResources.getValueForDensity(value.resourceId, density, value, true);
}
return mResources.loadDrawable(value, value.resourceId, density, mTheme);
}
return null;
}
/**
* Retrieve the Typeface for the attribute at <var>index</var>.
* <p>
* This method will throw an exception if the attribute is defined but is
* not a font.
*
* @param index Index of attribute to retrieve.
*
* @return Typeface for the attribute, or {@code null} if not defined.
* @throws RuntimeException if the TypedArray has already been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not a font resource.
*/
@Nullable
public Typeface getFont(@StyleableRes int index) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final TypedValue value = mValue;
if (getValueAt(index * STYLE_NUM_ENTRIES, value)) {
if (value.type == TypedValue.TYPE_ATTRIBUTE) {
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + index + ": " + value);
}
return mResources.getFont(value, value.resourceId);
}
return null;
}
/**
* Retrieve the resource identifier for the attribute at
* <var>index</var>. Note that attribute resource as resolved when
* the overall {@link TypedArray} object is retrieved. As a
* result, this function will return the resource identifier of the
* final resource value that was found, <em>not</em> necessarily the
* original resource that was specified by the attribute.
*
* @param index Index of attribute to retrieve.
* @param def Value to return if the attribute is not defined or
* not a resource.
* @return Attribute resource identifier, or defValue if not defined.
*/
public static int getResourceId(Resources.Theme theme, TypedArray a, TypedValue[] values, int index, int def) {
if (values != null && theme != null) {
TypedValue v = values[index];
if (v.type == TypedValue.TYPE_ATTRIBUTE) {
TEMP_ARRAY[0] = v.data;
TypedArray tmp = theme.obtainStyledAttributes(null, TEMP_ARRAY, 0, 0);
try {
return tmp.getResourceId(0, def);
} finally {
tmp.recycle();
}
}
}
if (a != null) {
return a.getResourceId(index, def);
}
return def;
}
private static String getAttributeValue(AXmlResourceParser parser, int index) {
int type = parser.getAttributeValueType(index);
int data = parser.getAttributeValueData(index);
if (type == TypedValue.TYPE_STRING) {
return parser.getAttributeValue(index);
}
if (type == TypedValue.TYPE_ATTRIBUTE) {
return String.format("?%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_REFERENCE) {
return String.format("@%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_FLOAT) {
return String.valueOf(Float.intBitsToFloat(data));
}
if (type == TypedValue.TYPE_INT_HEX) {
return String.format("0x%08X", data);
}
if (type == TypedValue.TYPE_INT_BOOLEAN) {
return data == 0 ? "false" : "true";
}
if (type == TypedValue.TYPE_DIMENSION) {
return Float.toString(complexToFloat(data)) +
DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type == TypedValue.TYPE_FRACTION) {
return Float.toString(complexToFloat(data)) +
FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
return String.format("#%08X", data);
}
if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
return String.valueOf(data);
}
return String.format("<0x%X, type 0x%02X>", data, type);
}
private static String getAttributeValue(XmlResourceParser parser, int index) {
int type = parser.getAttributeValueType(index);
int data = parser.getAttributeValueData(index);
if (type == TypedValue.TYPE_STRING) {
return parser.getAttributeValue(index);
}
if (type == TypedValue.TYPE_ATTRIBUTE) {
return String.format("?%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_REFERENCE) {
return String.format("@%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_FLOAT) {
return String.valueOf(Float.intBitsToFloat(data));
}
if (type == TypedValue.TYPE_INT_HEX) {
return String.format("0x%08X", data);
}
if (type == TypedValue.TYPE_INT_BOOLEAN) {
return data != 0 ? "true" : "false";
}
if (type == TypedValue.TYPE_DIMENSION) {
return Float.toString(complexToFloat(data)) + DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type == TypedValue.TYPE_FRACTION) {
return Float.toString(complexToFloat(data)) + FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
return String.format("#%08X", data);
}
if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
return String.valueOf(data);
}
return String.format("<0x%X, type 0x%02X>", data, type);
}
private static String getAttributeValue(XmlResourceParser parser, int index) {
int type = parser.getAttributeValueType(index);
int data = parser.getAttributeValueData(index);
if (type == TypedValue.TYPE_STRING) {
return parser.getAttributeValue(index);
}
if (type == TypedValue.TYPE_ATTRIBUTE) {
return String.format("?%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_REFERENCE) {
return String.format("@%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_FLOAT) {
return String.valueOf(Float.intBitsToFloat(data));
}
if (type == TypedValue.TYPE_INT_HEX) {
return String.format("0x%08X", data);
}
if (type == TypedValue.TYPE_INT_BOOLEAN) {
return data != 0 ? "true" : "false";
}
if (type == TypedValue.TYPE_DIMENSION) {
return Float.toString(complexToFloat(data))
+ DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type == TypedValue.TYPE_FRACTION) {
return Float.toString(complexToFloat(data))
+ FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT
&& type <= TypedValue.TYPE_LAST_COLOR_INT) {
return String.format("#%08X", data);
}
if (type >= TypedValue.TYPE_FIRST_INT
&& type <= TypedValue.TYPE_LAST_INT) {
return String.valueOf(data);
}
return String.format("<0x%X, type 0x%02X>", data, type);
}
private static String getAttributeValue(AXmlResourceParser parser, int index) {
int type = parser.getAttributeValueType(index);
int data = parser.getAttributeValueData(index);
if (type == TypedValue.TYPE_STRING) {
return parser.getAttributeValue(index);
}
if (type == TypedValue.TYPE_ATTRIBUTE) {
return String.format("?%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_REFERENCE) {
return String.format("@%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_FLOAT) {
return String.valueOf(Float.intBitsToFloat(data));
}
if (type == TypedValue.TYPE_INT_HEX) {
return String.format("0x%08X", data);
}
if (type == TypedValue.TYPE_INT_BOOLEAN) {
return data != 0 ? "true" : "false";
}
if (type == TypedValue.TYPE_DIMENSION) {
return Float.toString(complexToFloat(data))
+ DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type == TypedValue.TYPE_FRACTION) {
return Float.toString(complexToFloat(data))
+ FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT
&& type <= TypedValue.TYPE_LAST_COLOR_INT) {
return String.format("#%08X", data);
}
if (type >= TypedValue.TYPE_FIRST_INT
&& type <= TypedValue.TYPE_LAST_INT) {
return String.valueOf(data);
}
return String.format("<0x%X, type 0x%02X>", data, type);
}
public ResScalarValue factory(int type, int value, String rawValue) throws IOException {
switch (type) {
case TypedValue.TYPE_NULL:
return new ResReferenceValue(mPackage, 0, null);
case TypedValue.TYPE_REFERENCE:
return newReference(value, rawValue);
case TypedValue.TYPE_ATTRIBUTE:
return newReference(value, rawValue, true);
case TypedValue.TYPE_STRING:
return new ResStringValue(rawValue, value);
case TypedValue.TYPE_FLOAT:
return new ResFloatValue(Float.intBitsToFloat(value), value, rawValue);
case TypedValue.TYPE_DIMENSION:
return new ResDimenValue(value, rawValue);
case TypedValue.TYPE_FRACTION:
return new ResFractionValue(value, rawValue);
case TypedValue.TYPE_INT_BOOLEAN:
return new ResBoolValue(value != 0, value, rawValue);
case 0x07:
return newReference(value, rawValue);
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
return new ResColorValue(value, rawValue);
}
if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
return new ResIntValue(value, rawValue, type);
}
throw new IOException("Invalid value type: " + type);
}
private static String getAttributeValue(XmlResourceParser parser, int index) {
int type = parser.getAttributeValueType(index);
int data = parser.getAttributeValueData(index);
if (type == TypedValue.TYPE_STRING) {
return parser.getAttributeValue(index);
}
if (type == TypedValue.TYPE_ATTRIBUTE) {
return String.format("?%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_REFERENCE) {
return String.format("@%s%08X", getPackage(data), data);
}
if (type == TypedValue.TYPE_FLOAT) {
return String.valueOf(Float.intBitsToFloat(data));
}
if (type == TypedValue.TYPE_INT_HEX) {
return String.format("0x%08X", data);
}
if (type == TypedValue.TYPE_INT_BOOLEAN) {
return data != 0 ? "true" : "false";
}
if (type == TypedValue.TYPE_DIMENSION) {
return Float.toString(complexToFloat(data)) + DIMENSION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type == TypedValue.TYPE_FRACTION) {
return Float.toString(complexToFloat(data)) + FRACTION_UNITS[data & TypedValue.COMPLEX_UNIT_MASK];
}
if (type >= TypedValue.TYPE_FIRST_COLOR_INT && type <= TypedValue.TYPE_LAST_COLOR_INT) {
return String.format("#%08X", data);
}
if (type >= TypedValue.TYPE_FIRST_INT && type <= TypedValue.TYPE_LAST_INT) {
return String.valueOf(data);
}
if (type == 0x07) {
return String.format("@%s%08X", getPackage(data), data);
}
return String.format("<0x%X, type 0x%02X>", data, type);
}
/**
* Retrieve the ComplexColor for the attribute at <var>index</var>.
* The value may be either a {@link android.content.res.ColorStateList} which can wrap a simple
* color value or a {@link android.content.res.GradientColor}
* <p>
* This method will return {@code null} if the attribute is not defined or
* is not an integer color, color state list or GradientColor.
*
* @param index Index of attribute to retrieve.
*
* @return ComplexColor for the attribute, or {@code null} if not defined.
* @throws RuntimeException if the attribute if the TypedArray has already
* been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not an integer color, color state list or GradientColor.
* @hide
*/
@Nullable
public ComplexColor getComplexColor(@StyleableRes int index) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final TypedValue value = mValue;
if (getValueAt(index * STYLE_NUM_ENTRIES, value)) {
if (value.type == TypedValue.TYPE_ATTRIBUTE) {
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + index + ": " + value);
}
return mResources.loadComplexColor(value, value.resourceId, mTheme);
}
return null;
}
/**
* Retrieve the ColorStateList for the attribute at <var>index</var>.
* The value may be either a single solid color or a reference to
* a color or complex {@link android.content.res.ColorStateList}
* description.
* <p>
* This method will return {@code null} if the attribute is not defined or
* is not an integer color or color state list.
*
* @param index Index of attribute to retrieve.
*
* @return ColorStateList for the attribute, or {@code null} if not
* defined.
* @throws RuntimeException if the attribute if the TypedArray has already
* been recycled.
* @throws UnsupportedOperationException if the attribute is defined but is
* not an integer color or color state list.
*/
@Nullable
public ColorStateList getColorStateList(@StyleableRes int index) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
final TypedValue value = mValue;
if (getValueAt(index * STYLE_NUM_ENTRIES, value)) {
if (value.type == TypedValue.TYPE_ATTRIBUTE) {
throw new UnsupportedOperationException(
"Failed to resolve attribute at index " + index + ": " + value);
}
return mResources.loadColorStateList(value, value.resourceId, mTheme);
}
return null;
}
/**
* @hide
*/
@Nullable
public int[] extractThemeAttrs(@Nullable int[] scrap) {
if (mRecycled) {
throw new RuntimeException("Cannot make calls to a recycled instance!");
}
int[] attrs = null;
final int[] data = mData;
final int N = length();
for (int i = 0; i < N; i++) {
final int index = i * STYLE_NUM_ENTRIES;
if (data[index + STYLE_TYPE] != TypedValue.TYPE_ATTRIBUTE) {
// Not an attribute, ignore.
continue;
}
// Null the entry so that we can safely call getZzz().
data[index + STYLE_TYPE] = TypedValue.TYPE_NULL;
final int attr = data[index + STYLE_DATA];
if (attr == 0) {
// Useless data, ignore.
continue;
}
// Ensure we have a usable attribute array.
if (attrs == null) {
if (scrap != null && scrap.length == N) {
attrs = scrap;
Arrays.fill(attrs, 0);
} else {
attrs = new int[N];
}
}
attrs[i] = attr;
}
return attrs;
}
/**
* Retrieve a dimensional unit attribute at <var>index</var> for use as a size in raw pixels. A
* size conversion involves rounding the base value, and ensuring that a non-zero base value is at
* least one pixel in size.
*
* <p>This method will throw an exception if the attribute is defined but is not a dimension.
*
* @param context The Context the view is running in, through which the current theme, resources,
* etc can be accessed.
* @param attributes array of typed attributes from which the dimension unit must be read.
* @param index Index of attribute to retrieve.
* @param defaultValue Value to return if the attribute is not defined or not a resource.
* @return Attribute dimension value multiplied by the appropriate metric and truncated to integer
* pixels, or defaultValue if not defined.
* @throws UnsupportedOperationException if the attribute is defined but is not a dimension.
* @see TypedArray#getDimensionPixelSize(int, int)
*/
public static int getDimensionPixelSize(
@NonNull Context context,
@NonNull TypedArray attributes,
@StyleableRes int index,
final int defaultValue) {
TypedValue value = new TypedValue();
if (!attributes.getValue(index, value) || value.type != TypedValue.TYPE_ATTRIBUTE) {
return attributes.getDimensionPixelSize(index, defaultValue);
}
TypedArray styledAttrs = context.getTheme().obtainStyledAttributes(new int[] {value.data});
int dimension = styledAttrs.getDimensionPixelSize(0, defaultValue);
styledAttrs.recycle();
return dimension;
}