getDrawable(int id) getColor(int id) is deprecate 已过时

写代码是发现：

推荐使用：

为了兼容高、低版本 可以采用

ContextCompat.getColor(Context context, int id);

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);
}

改方法中采用了新方法获取资源 getColor(@ColorRes int id, @Nullable Theme theme)

/**
 * 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 {
    final TypedValue value = obtainTempTypedValue();
    try {
        final ResourcesImpl impl = mResourcesImpl;
        impl.getValue(id, value, true);
        if (value.type >= TypedValue.TYPE_FIRST_INT
                && value.type <= TypedValue.TYPE_LAST_INT) {
            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");
        }

        final ColorStateList csl = impl.loadColorStateList(this, value, id, theme);
        return csl.getDefaultColor();
    } finally {
        releaseTempTypedValue(value);
    }
}

为了兼容高、低版本 可以采用

ContextCompat.getColor(Context context, int id);

代码如下：

/**
 * 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.
 */
@ColorInt
public static final int getColor(Context context, @ColorRes int id) {
    final int version = Build.VERSION.SDK_INT;
    if (version >= 23) {
        return ContextCompatApi23.getColor(context, id);
    } else {
        return context.getResources().getColor(id);
    }
}

ContextCompatApi23.getColor(context, id) 方法代码如下：

class ContextCompatApi23 {
    public static ColorStateList getColorStateList(Context context, int id) {
        return context.getColorStateList(id);
    }

    public static int getColor(Context context, int id) {
        return context.getColor(id);
    }
}

context.getColor(id) 方法代码如下：

/**
 * 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.
 */
@ColorInt
public final int getColor(@ColorRes int id) {
    return getResources().getColor(id, getTheme());
}

getDrawable(int id) 采用了类似于 getColor(int id) 方法