TintManager.java 文件源码

/**
 * Obtains an array of colors from the current theme containing colors for control's normal,
 * disabled and error state.
 *
 * @param context Context used to access current theme and process also its attributes.
 * @return Array with following colors:
 * <ul>
 * <li>[{@link #THEME_COLOR_INDEX_NORMAL}] = {@link R.attr#colorControlNormal colorControlNormal}</li>
 * <li>[{@link #THEME_COLOR_INDEX_DISABLED}] = colorControlNormal with alpha value of {@link android.R.attr#disabledAlpha android:disabledAlpha}</li>
 * <li>[{@link #THEME_COLOR_INDEX_ERROR}] = {@link R.attr#uiColorErrorHighlight uiColorErrorHighlight}</li>
 * </ul>
 */
@Size(3)
private static int[] obtainThemeColors(Context context) {
    final TypedValue typedValue = new TypedValue();
    final Resources.Theme theme = context.getTheme();
    final boolean isDarkTheme = !theme.resolveAttribute(R.attr.isLightTheme, typedValue, true) || typedValue.data == 0;
    final TypedArray typedArray = context.obtainStyledAttributes(null, R.styleable.Ui_Theme_Tint);
    int colorNormal = isDarkTheme ? COLOR_NORMAL : COLOR_NORMAL_LIGHT;
    int colorDisabled = isDarkTheme ? COLOR_DISABLED : COLOR_DISABLED_LIGHT;
    int colorError = COLOR_ERROR;
    if (typedArray != null) {
        final int n = typedArray.getIndexCount();
        for (int i = 0; i < n; i++) {
            final int index = typedArray.getIndex(i);
            if (index == R.styleable.Ui_Theme_Tint_colorControlNormal) {
                colorNormal = typedArray.getColor(index, colorNormal);
            } else if (index == R.styleable.Ui_Theme_Tint_android_disabledAlpha) {
                colorDisabled = Colors.withAlpha(colorNormal, typedArray.getFloat(index, ALPHA_RATIO_DISABLED));
            } else if (index == R.styleable.Ui_Theme_Tint_uiColorErrorHighlight) {
                colorError = typedArray.getColor(index, colorError);
            }
        }
        typedArray.recycle();
    }
    return new int[] {
            colorNormal,
            colorDisabled,
            colorError
    };
}