daolq3012/CornerButton.java

public class StringUtils {

    private StringUtils() {
        // No-op
    }

    public static boolean isBlank(String str) {
        return str == null || TextUtils.isEmpty(str.trim()) || str.equalsIgnoreCase("null");
    }

    public static boolean isNotBlank(String str) {
        return !isBlank(str);
    }

    public static String getString(Context context, @StringRes int stringId) {
        return context.getResources().getString(stringId);
    }

    public static String trim(String input) {
        if (TextUtils.isEmpty(input)) {
            return input;
        }
        String output = input.trim();
        while (output.startsWith("\u3000")) {
            output = output.substring(1, output.length());
        }

        while (output.endsWith("\u3000")) {
            output = output.substring(0, output.length() - 1);
        }

        return output;
    }
}

/**
     * Transform color to darker or lighter
     *
     * @param color input color
     * @param factor < 1: darker, > 1: lighter
     */
    public static int addColor(int color, float factor) {
        int a = Color.alpha(color);
        int r = Math.round(Color.red(color) * factor);
        int g = Math.round(Color.green(color) * factor);
        int b = Math.round(Color.blue(color) * factor);
        return Color.argb(a, Math.min(r, 255), Math.min(g, 255), Math.min(b, 255));
    }

    /**
     * Transform color to darker or lighter (alpha)
     *
     * @param color input color
     * @param factor < 1: opacity, > 1: transparent
     */
    public static int addAlpha(int color, float factor) {
        int a = Math.round(Color.alpha(color) * factor);
        int r = Color.red(color);
        int g = Color.green(color);
        int b = Color.blue(color);
        return Color.argb(Math.min(a, 255), r, g, b);
    }