android.util.TypedValue#TYPE_NULL源码实例Demo

/**
 * Retrieves the styled string value for the attribute at <var>index</var>.
 * <p>
 * If the attribute is not a string, this method will attempt to coerce
 * it to a string.
 *
 * @param index Index of attribute to retrieve.
 *
 * @return CharSequence holding string data. May be styled. Returns
 *         {@code null} if the attribute is not defined or could not be
 *         coerced to a string.
 * @throws RuntimeException if the TypedArray has already been recycled.
 */
public CharSequence getText(@StyleableRes int index) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    index *= STYLE_NUM_ENTRIES;
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    if (type == TypedValue.TYPE_NULL) {
        return null;
    } else if (type == TypedValue.TYPE_STRING) {
        return loadStringValueAt(index);
    }

    final TypedValue v = mValue;
    if (getValueAt(index, v)) {
        return v.coerceToString();
    }

    // We already checked for TYPE_NULL. This should never happen.
    throw new RuntimeException("getText of bad type: 0x" + Integer.toHexString(type));
}
 

/**
 * Retrieve the boolean value for the attribute at <var>index</var>.
 * <p>
 * If the attribute is an integer value, this method will return whether
 * it is equal to zero. If the attribute is not a boolean or integer value,
 * this method will attempt to coerce it to an integer using
 * {@link Integer#decode(String)} and return whether it is equal to zero.
 *
 * @param index Index of attribute to retrieve.
 * @param defValue Value to return if the attribute is not defined or
 *                 cannot be coerced to an integer.
 *
 * @return Boolean value of the attribute, or defValue if the attribute was
 *         not defined or could not be coerced to an integer.
 * @throws RuntimeException if the TypedArray has already been recycled.
 */
public boolean getBoolean(@StyleableRes int index, boolean defValue) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    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_FIRST_INT
            && type <= TypedValue.TYPE_LAST_INT) {
        return data[index + STYLE_DATA] != 0;
    }

    final TypedValue v = mValue;
    if (getValueAt(index, v)) {
        StrictMode.noteResourceMismatch(v);
        return XmlUtils.convertValueToBoolean(v.coerceToString(), defValue);
    }

    // We already checked for TYPE_NULL. This should never happen.
    throw new RuntimeException("getBoolean of bad type: 0x" + Integer.toHexString(type));
}
 

/**
 * Retrieve the integer value for the attribute at <var>index</var>.
 * <p>
 * Unlike {@link #getInt(int, int)}, this method will throw an exception if
 * the attribute is defined but is not an integer.
 *
 * @param index Index of attribute to retrieve.
 * @param defValue Value to return if the attribute is not defined or
 *                 not a resource.
 *
 * @return Attribute integer 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 an integer.
 */
public int getInteger(@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_FIRST_INT
            && type <= TypedValue.TYPE_LAST_INT) {
        return data[index + STYLE_DATA];
    } 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 integer: type=0x" + Integer.toHexString(type));
}
 

/**
 * 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 a dimensional unit attribute at <var>index</var> for use
 * as a size in raw pixels.  This is the same as
 * {@link #getDimension}, except the returned value is converted to
 * integer pixels for use as a size.  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 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 a dimension.
 *
 * @see #getDimension
 * @see #getDimensionPixelOffset
 */
public int getDimensionPixelSize(@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.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("Can't convert value at index " + attrIndex
            + " to dimension: type=0x" + Integer.toHexString(type));
}
 

/**
 * 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));
}
 

public boolean addColorAttr(StyledAttributesHelper attrs,
                            int attr, LiveThemeManager.ColorPropertyApplier applier,
                            ColorStateListApplier colorStateListApplier) {
    TypedValue typedValue = new TypedValue();
    if (!attrs.getValue(attr, typedValue))
        return false;
    if (typedValue.type >= TypedValue.TYPE_FIRST_COLOR_INT &&
            typedValue.type <= TypedValue.TYPE_LAST_COLOR_INT) {
        addColorProperty(typedValue.resourceId, applier);
        return true;
    } else if (typedValue.type != TypedValue.TYPE_NULL && colorStateListApplier != null) {
        try {
            ThemedColorStateList th = ThemedColorStateList.createFromXml(
                    mContext.getResources(),
                    mContext.getResources().getXml(typedValue.resourceId), getTheme());
            th.attachToComponent(this, () ->
                    colorStateListApplier.onColorStateListChanged(th.createColorStateList()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }
    return false;
}
 

/**
 * Return a mask of the configuration parameters for which the values in
 * this typed array may change.
 *
 * @return Returns a mask of the changing configuration parameters, as
 *         defined by {@link android.content.pm.ActivityInfo}.
 * @throws RuntimeException if the TypedArray has already been recycled.
 * @see android.content.pm.ActivityInfo
 */
public @Config int getChangingConfigurations() {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    @Config int changingConfig = 0;

    final int[] data = mData;
    final int N = length();
    for (int i = 0; i < N; i++) {
        final int index = i * STYLE_NUM_ENTRIES;
        final int type = data[index + STYLE_TYPE];
        if (type == TypedValue.TYPE_NULL) {
            continue;
        }
        changingConfig |= ActivityInfo.activityInfoConfigNativeToJava(
                data[index + STYLE_CHANGING_CONFIGURATIONS]);
    }
    return changingConfig;
}
 

private boolean getValueAt(int index, TypedValue outValue) {
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    if (type == TypedValue.TYPE_NULL) {
        return false;
    }
    outValue.type = type;
    outValue.data = data[index + STYLE_DATA];
    outValue.assetCookie = data[index + STYLE_ASSET_COOKIE];
    outValue.resourceId = data[index + STYLE_RESOURCE_ID];
    outValue.changingConfigurations = ActivityInfo.activityInfoConfigNativeToJava(
            data[index + STYLE_CHANGING_CONFIGURATIONS]);
    outValue.density = data[index + STYLE_DENSITY];
    outValue.string = (type == TypedValue.TYPE_STRING) ? loadStringValueAt(index) : null;
    return true;
}
 

/**
 * Returns a color value specified by the given theme attribute.
 *
 * @param context
 *         the required context.
 * @param colorAttribute
 *         a theme attribute such as <code>R.attr.colorBackground</code>.
 *
 * @return a color. In case of errors <code>Color.CYAN</code> is returned.
 */
@ColorInt
public static int getColor(Context context, int colorAttribute) {
    final TypedValue outValue = new TypedValue();
    context.getTheme().resolveAttribute(colorAttribute, outValue, true);
    if (isColor(outValue)) {
        return outValue.data;
    } else if (outValue.type == TypedValue.TYPE_REFERENCE || outValue.type == TypedValue.TYPE_STRING) {
        try {
            final ColorStateList colors = ContextCompat.getColorStateList(context, outValue.resourceId);
            return colors.getDefaultColor();
        } catch (Resources.NotFoundException ex) {
            Log.d(ThemeUtil.class.getName(), ex.getMessage());
        }
    } else if (outValue.type == TypedValue.TYPE_NULL) {
        return getColorFromStyleable(context, styleableForAttr(colorAttribute));
    }
    // default to cyan in case of errors
    return Color.CYAN;
}
 

/**
 * Retrieves the string value for the attribute at <var>index</var> that is
 * not allowed to change with the given configurations.
 *
 * @param index Index of attribute to retrieve.
 * @param allowedChangingConfigs Bit mask of configurations from
 *        {@link Configuration}.NATIVE_CONFIG_* that are allowed to change.
 *
 * @return String holding string data. Any styling information is removed.
 *         Returns {@code null} if the attribute is not defined.
 * @throws RuntimeException if the TypedArray has already been recycled.
 * @hide
 */
public String getNonConfigurationString(@StyleableRes int index,
        @Config int allowedChangingConfigs) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    index *= STYLE_NUM_ENTRIES;
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    final @Config int changingConfigs = ActivityInfo.activityInfoConfigNativeToJava(
            data[index + STYLE_CHANGING_CONFIGURATIONS]);
    if ((changingConfigs & ~allowedChangingConfigs) != 0) {
        return null;
    }
    if (type == TypedValue.TYPE_NULL) {
        return null;
    } else if (type == TypedValue.TYPE_STRING) {
        return loadStringValueAt(index).toString();
    }

    final TypedValue v = mValue;
    if (getValueAt(index, v)) {
        final CharSequence cs = v.coerceToString();
        return cs != null ? cs.toString() : null;
    }

    // We already checked for TYPE_NULL. This should never happen.
    throw new RuntimeException("getNonConfigurationString of bad type: 0x"
            + Integer.toHexString(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);
}
 

public static int getType(TypedArray array, int index) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) return array.getType(index);
    else {
        TypedValue value = array.peekValue(index);
        return value == null ? TypedValue.TYPE_NULL : value.type;
    }
}
 

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
    final boolean isPortrait = metrics.widthPixels < metrics.heightPixels;

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int width = getMeasuredWidth();
    boolean measure = false;

    widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY);

    final TypedValue tv = isPortrait ? mMinWidthMinor : mMinWidthMajor;

    if (tv.type != TypedValue.TYPE_NULL) {
        final int min;
        if (tv.type == TypedValue.TYPE_DIMENSION) {
            min = (int)tv.getDimension(metrics);
        } else if (tv.type == TypedValue.TYPE_FRACTION) {
            min = (int)tv.getFraction(metrics.widthPixels, metrics.widthPixels);
        } else {
            min = 0;
        }

        if (width < min) {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(min, EXACTLY);
            measure = true;
        }
    }

    // TODO: Support height?

    if (measure) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}
 

/**
 * Determines whether there is an attribute at <var>index</var>, returning
 * {@code true} if the attribute was explicitly set to {@code @empty} and
 * {@code false} only if the attribute was undefined.
 *
 * @param index Index of attribute to retrieve.
 *
 * @return True if the attribute has a value or is empty, false otherwise.
 * @throws RuntimeException if the TypedArray has already been recycled.
 */
public boolean hasValueOrEmpty(@StyleableRes int index) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    index *= STYLE_NUM_ENTRIES;
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    return type != TypedValue.TYPE_NULL
            || data[index + STYLE_DATA] == TypedValue.DATA_NULL_EMPTY;
}
 

public static int getType(TypedArray array, int index) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        return array.getType(index);
    else {
        TypedValue value = array.peekValue(index);
        return value == null ? TypedValue.TYPE_NULL : value.type;
    }
}
 

public ResScalarValue factory(int type, int value, String rawValue) throws AndrolibException {
    switch (type) {
        case TypedValue.TYPE_NULL:
            if (value == TypedValue.DATA_NULL_UNDEFINED) { // Special case $empty as explicitly defined empty value
                return new ResStringValue(null, value);
            } else if (value == TypedValue.DATA_NULL_EMPTY) {
                return new ResEmptyValue(value, rawValue, type);
            }
            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 TypedValue.TYPE_DYNAMIC_REFERENCE:
            return newReference(value, rawValue);
        case TypedValue.TYPE_DYNAMIC_ATTRIBUTE:
            return newReference(value, rawValue, true);
    }

    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 AndrolibException("Invalid value type: " + type);
}
 

private static void resolveAttribute(Theme theme, int attrId, TypedValue outValue, boolean resolveRefs) {
    if (CustomThemeHelper.resolveAttribute(attrId, outValue)) return;
    if (!theme.resolveAttribute(attrId, outValue, resolveRefs)) outValue.type = TypedValue.TYPE_NULL;
}
 

/**
 * Determines whether there is an attribute at <var>index</var>.
 * <p>
 * <strong>Note:</strong> If the attribute was set to {@code @empty} or
 * {@code @undefined}, this method returns {@code false}.
 *
 * @param index Index of attribute to retrieve.
 *
 * @return True if the attribute has a value, false otherwise.
 * @throws RuntimeException if the TypedArray has already been recycled.
 */
public boolean hasValue(@StyleableRes int index) {
    if (mRecycled) {
        throw new RuntimeException("Cannot make calls to a recycled instance!");
    }

    index *= STYLE_NUM_ENTRIES;
    final int[] data = mData;
    final int type = data[index + STYLE_TYPE];
    return type != TypedValue.TYPE_NULL;
}