Java 类android.support.annotation.FontRes 实例源码

/**
 * Tries to pull the Custom Attribute directly from the TextView.
 *
 * @param context     Activity Context
 * @param attrs       View Attributes
 * @param attributeId if -1 returns null.
 * @return null if attribute is not defined or added to View
 */
@FontRes
static int pullFontPathFromView(Context context, AttributeSet attrs, int[] attributeId) {
    if (attributeId == null || attrs == null)
        return 0;

    final String attributeName;
    try {
        attributeName = context.getResources().getResourceEntryName(attributeId[0]);
    } catch (Resources.NotFoundException e) {
        // invalid attribute ID
        return 0;
    }

    final int stringResourceId = attrs.getAttributeResourceValue(null, attributeName, -1);
    return stringResourceId > 0
            ? stringResourceId
            : attrs.getAttributeIntValue(null, attributeName, 0);
}

/**
 * Tries to pull the Font Path from the View Style as this is the next decendent after being
 * defined in the View's xml.
 *
 * @param context     Activity Activity Context
 * @param attrs       View Attributes
 * @param attributeId if -1 returns null.
 * @return null if attribute is not defined or found in the Style
 */
@FontRes
static int pullFontPathFromStyle(Context context, AttributeSet attrs, int[] attributeId) {
    if (attributeId == null || attrs == null)
        return 0;
    final TypedArray typedArray = context.obtainStyledAttributes(attrs, attributeId);
    if (typedArray != null) {
        try {
            // First defined attribute
            int fontFromAttribute = typedArray.getResourceId(0, 0);
            if (fontFromAttribute != 0) {
                return fontFromAttribute;
            }
        } catch (Exception ignore) {
            // Failed for some reason.
        } finally {
            typedArray.recycle();
        }
    }
    return 0;
}

/**
 * Tries to pull the Font Path from the Text Appearance.
 *
 * @param context     Activity Context
 * @param attrs       View Attributes
 * @param attributeId if -1 returns null.
 * @return returns null if attribute is not defined or if no TextAppearance is found.
 */
@FontRes
static int pullFontPathFromTextAppearance(final Context context, AttributeSet attrs, int[] attributeId) {
    if (attributeId == null || attrs == null)
        return 0;
    int textAppearanceId = -1;
    // For prevent using default component font
    final ContextThemeWrapper contextThemeWrapper = new ContextThemeWrapper(context, android.R.style.Theme_NoDisplay);
    final TypedArray typedArrayAttr = contextThemeWrapper.obtainStyledAttributes(attrs, ANDROID_ATTR_TEXT_APPEARANCE);
    if (typedArrayAttr != null) {
        try {
            textAppearanceId = typedArrayAttr.getResourceId(0, 0);
        } catch (Exception ignored) {
            // Failed for some reason
            return 0;
        } finally {
            typedArrayAttr.recycle();
        }
    }

    final Integer textAppearanceAttrs = getFontFromTextAppearance(context, attributeId, textAppearanceId);
    if (textAppearanceAttrs != null) return textAppearanceAttrs;
    return 0;
}

/**
 * Last but not least, try to pull the Font Path from the Theme, which is defined.
 *
 * @param context     Activity Context
 * @param styleAttrId Theme style id
 * @param attributeId if -1 returns null.
 * @return null if no theme or attribute defined.
 */
@FontRes
static int pullFontPathFromTheme(Context context, int styleAttrId, int[] attributeId) {
    if (styleAttrId == -1 || attributeId == null)
        return 0;

    final Resources.Theme theme = context.getTheme();
    final TypedValue value = new TypedValue();

    theme.resolveAttribute(styleAttrId, value, true);
    final TypedArray typedArray = theme.obtainStyledAttributes(value.resourceId, attributeId);
    try {
        return typedArray.getResourceId(0, 0);
    } catch (Exception ignore) {
        // Failed for some reason.
        return 0;
    } finally {
        typedArray.recycle();
    }
}

private Typeface getDefaultTypeface(Context context, @FontRes int fontFamily) {
    if (fontFamily == 0) {
        fontFamily = CalligraphyConfig.get().getFontFamily();
    }
    if (fontFamily != 0) {
        return ResourcesCompat.getFont(context, fontFamily);
    }
    return null;
}

private void setTabFont(int textViewId, @FontRes int font, int position) {
    if (font == 0)
        return;

    Typeface typeface = ResourcesCompat.getFont(getContext(), font);
    setTabFont(textViewId, typeface, position);
}

/**
 * @return mFontFamily for text views might be null
 */
@FontRes
public int getFontFamily() {
    return mFontFamily;
}

public TabbedViewPager setSelectedTabFont(@FontRes int font) {
    selectedTabFont = font;
    return this;
}

public CustomDownloadableFontProvider(@FontRes int resourceFont) {
    this.resourceFont = resourceFont;
}

public @FontRes int getFontResId() {
    return fontResId;
}

/**
 * Set the default font if you don't define one else where in your styles.
 *
 * @param defaultFont a path to a font file in the assets folder, e.g. "fonts/Roboto-light.ttf",
 *                             passing null will default to the device font-family.
 * @return this builder.
 */
public Builder setDefaultFont(@FontRes int defaultFont) {
    this.isFontSet = defaultFont != 0;
    this.fontFamily = defaultFont;
    return this;
}

@FontRes int getFontResId();