【Android】getColor(int id)在API23时过时

1.getColor(int id)过时

最近发现getColor(int id)在API版本23时(Android 6.0)已然过时,以下为getColor(int id)源码(Resource.java)：

    /**     * Returns a color integer associated with a particular resource ID. If the     * resource holds a complex {@link ColorStateList}, then the default color     * from the set is returned.     *     * @param id The desired resource identifier, as generated by the aapt     *           tool. This integer encodes the package, type, and resource     *           entry. The value 0 is an invalid identifier.     *     * @throws NotFoundException Throws NotFoundException if the given ID does     *         not exist.     *     * @return A single color value in the form 0xAARRGGBB.     * @deprecated Use {@link #getColor(int, Theme)} instead.     */    @ColorInt    @Deprecated    public int getColor(@ColorRes int id) throws NotFoundException {        return getColor(id, null);    }

此类中使用了新方法getColor(@ColorRes int id, @Nullable Theme theme)来获取资源：

    /**     * Returns a themed color integer associated with a particular resource ID.     * If the resource holds a complex {@link ColorStateList}, then the default     * color from the set is returned.     *     * @param id The desired resource identifier, as generated by the aapt     *           tool. This integer encodes the package, type, and resource     *           entry. The value 0 is an invalid identifier.     * @param theme The theme used to style the color attributes, may be     *              {@code null}.     *     * @throws NotFoundException Throws NotFoundException if the given ID does     *         not exist.     *     * @return A single color value in the form 0xAARRGGBB.     */    @ColorInt    public int getColor(@ColorRes int id, @Nullable Theme theme) throws NotFoundException {        TypedValue value;        synchronized (mAccessLock) {            value = mTmpValue;            if (value == null) {                value = new TypedValue();            }            getValue(id, value, true);            if (value.type >= TypedValue.TYPE_FIRST_INT                    && value.type <= TypedValue.TYPE_LAST_INT) {                mTmpValue = value;                return value.data;            } else if (value.type != TypedValue.TYPE_STRING) {                throw new NotFoundException(                        "Resource ID #0x" + Integer.toHexString(id) + " type #0x"                                + Integer.toHexString(value.type) + " is not valid");            }            mTmpValue = null;        }        final ColorStateList csl = loadColorStateList(value, id, theme);        synchronized (mAccessLock) {            if (mTmpValue == null) {                mTmpValue = value;            }        }        return csl.getDefaultColor();    }

2.当前替代的使用方法

// 同时兼容高、低版本ContextCompat.getColor(Context context, int id);

1.源码解析

ContextCompat.getColor(Context context, int id)源码如下：

    /**     * Returns a color associated with a particular resource ID     * <p>     * Starting in {@link android.os.Build.VERSION_CODES#M}, the returned     * color will be styled for the specified Context's theme.     *     * @param id The desired resource identifier, as generated by the aapt     *           tool. This integer encodes the package, type, and resource     *           entry. The value 0 is an invalid identifier.     * @return A single color value in the form 0xAARRGGBB.     * @throws android.content.res.Resources.NotFoundException if the given ID     *         does not exist.     */    public static final int getColor(Context context, int id) {        final int version = Build.VERSION.SDK_INT;        if (version >= 23) {            return ContextCompatApi23.getColor(context, id);        } else {            return context.getResources().getColor(id);        }    }

从这里我们可以看出，当API版本>=23时，使用ContextCompatApi23.getColor(context, id)方法，当API版本<23时，使用context.getResources().getColor(id)方法获取相应色值，继续往下看：
ContextCompatApi23.getColor(context, id)源码如下：

// ContextCompatApi23.javapublic static int getColor(Context context, int id) {        return context.getColor(id);    }    // 继续解析context.getColor(id)源码--Context.java：        /**     * Returns a color associated with a particular resource ID and styled for     * the current theme.     *     * @param id The desired resource identifier, as generated by the aapt     *           tool. This integer encodes the package, type, and resource     *           entry. The value 0 is an invalid identifier.     * @return A single color value in the form 0xAARRGGBB.     * @throws android.content.res.Resources.NotFoundException if the given ID     *         does not exist.     */    @Nullable    public final int getColor(int id) {        // 注：这里调用了Resource.java类中的getColor(int id, Theme theme)方法        return getResources().getColor(id, getTheme());    }

context.getResources().getColor(id)源码如下：

    /**     * Returns a color integer associated with a particular resource ID. If the     * resource holds a complex {@link ColorStateList}, then the default color     * from the set is returned.     *     * @param id The desired resource identifier, as generated by the aapt     *           tool. This integer encodes the package, type, and resource     *           entry. The value 0 is an invalid identifier.     *     * @throws NotFoundException Throws NotFoundException if the given ID does     *         not exist.     *     * @return A single color value in the form 0xAARRGGBB.     * @deprecated Use {@link #getColor(int, Theme)} instead.     */    @ColorInt    @Deprecated    public int getColor(@ColorRes int id) throws NotFoundException {    // 这里同样调用了Resource.java中的getColor(int id, Theme theme)方法,传入的Theme值为null(低版本)--等同于调用getColor(int id)--参考上面源码.        return getColor(id, null);    }