如何将字符串转换为const类的int值？
[英]How can I convert string to const class int value?
问题描述
我有变量：
String colorName = "BLUE";
我想将此颜色设置为android应用程序中的paint。 它应该是这样的：
paint.setColor ("Color." + colorName);
但是我收到错误警告，因为setColor（）函数的参数应该是int。 有什么想法？谢谢。
5 个解决方案
解决方案1
6 2012-01-21 11:55:33
也许你想要这个版本。
paint.setColor(Color.parseColor(String color)
http://developer.android.com/reference/android/graphics/Color.html#parseColor%28java.lang.String%29
解决方案2
2 2012-01-21 11:21:06
你需要这样做：
paint.setColor(Color.BLUE);
解决方案3
2 已采纳 2012-01-21 11:23:41
尝试这个：
protected static final int colorName = Color.BLUE;
paint.setColor(colorName);
编辑：正如我所见，你将你的颜色作为一个字符串。 所以你必须检查它是什么颜色，然后设置'colorName'变量。 像这样的东西：
if(yourcolorstring.equals("Blue")){
colorName = Color.BLUE;
}else if(yourcolorstring.equals("Black")){
colorName = Color.BLACK;
}else{
colorName = Color.WHITE;
}
解决方案4
2 2012-01-21 11:57:38
如果您有很长的颜色列表，并且您不想编写if ... else if语句的长序列， if您也可以使用Map来实现。 键是具有颜色名称的字符串，值是您要查找的Color常量值。 例：
Map<String, Color> colors = new HashMap<String, Color>();
colors.put("BLUE", Color.BLUE);
colors.put("RED", Color.RED);
colors.put("GREEN", Color.GREEN);
// To find the Color constant, look it up in the map:
String text = "BLUE";
Color c = colors.get(text);
if (c != null) {
paint.setColor(c);
} else {
System.out.println("Unknown color: " + text);
}
解决方案5
1 2012-01-21 11:53:55
至少在标准Java中可以使用：
import javax.swing.text.html.CSS;
String colorName = "fuchsia"; // "maroon", "rgb(1,20,30)", "#ff00aa"
Color color = CSS.stringToColor(colorName);
这是因为HTML支持; 你也可以写一个JLabel
"<html><span style='color:blue'>hello</span>"
Oracle的JDK 7要显示哪些文本常量可行以及哪些格式：
/**
* Convert a "#FFFFFF" hex string to a Color.
* If the color specification is bad, an attempt
* will be made to fix it up.
*/
static final Color hexToColor(String value) {
String digits;
int n = value.length();
if (value.startsWith("#")) {
digits = value.substring(1, Math.min(value.length(), 7));
} else {
digits = value;
}
String hstr = "0x" + digits;
Color c;
try {
c = Color.decode(hstr);
} catch (NumberFormatException nfe) {
c = null;
}
return c;
}
/**
* Convert a color string such as "RED" or "#NNNNNN" or "rgb(r, g, b)"
* to a Color.
*/
static Color stringToColor(String str) {
Color color;
if (str == null) {
return null;
}
if (str.length() == 0)
color = Color.black;
else if (str.startsWith("rgb(")) {
color = parseRGB(str);
}
else if (str.charAt(0) == '#')
color = hexToColor(str);
else if (str.equalsIgnoreCase("Black"))
color = hexToColor("#000000");
else if(str.equalsIgnoreCase("Silver"))
color = hexToColor("#C0C0C0");
else if(str.equalsIgnoreCase("Gray"))
color = hexToColor("#808080");
else if(str.equalsIgnoreCase("White"))
color = hexToColor("#FFFFFF");
else if(str.equalsIgnoreCase("Maroon"))
color = hexToColor("#800000");
else if(str.equalsIgnoreCase("Red"))
color = hexToColor("#FF0000");
else if(str.equalsIgnoreCase("Purple"))
color = hexToColor("#800080");
else if(str.equalsIgnoreCase("Fuchsia"))
color = hexToColor("#FF00FF");
else if(str.equalsIgnoreCase("Green"))
color = hexToColor("#008000");
else if(str.equalsIgnoreCase("Lime"))
color = hexToColor("#00FF00");
else if(str.equalsIgnoreCase("Olive"))
color = hexToColor("#808000");
else if(str.equalsIgnoreCase("Yellow"))
color = hexToColor("#FFFF00");
else if(str.equalsIgnoreCase("Navy"))
color = hexToColor("#000080");
else if(str.equalsIgnoreCase("Blue"))
color = hexToColor("#0000FF");
else if(str.equalsIgnoreCase("Teal"))
color = hexToColor("#008080");
else if(str.equalsIgnoreCase("Aqua"))
color = hexToColor("#00FFFF");
else if(str.equalsIgnoreCase("Orange"))
color = hexToColor("#FF8000");
else
color = hexToColor(str); // sometimes get specified without leading #
return color;
}
/**
* Parses a String in the format <code>rgb(r, g, b)</code> where
* each of the Color components is either an integer, or a floating number
* with a % after indicating a percentage value of 255. Values are
* constrained to fit with 0-255. The resulting Color is returned.
*/
private static Color parseRGB(String string) {
// Find the next numeric char
int[] index = new int[1];
index[0] = 4;
int red = getColorComponent(string, index);
int green = getColorComponent(string, index);
int blue = getColorComponent(string, index);
return new Color(red, green, blue);
}
/**
* Returns the next integer value from <code>string</code> starting
* at <code>index[0]</code>. The value can either can an integer, or
* a percentage (floating number ending with %), in which case it is
* multiplied by 255.
*/
private static int getColorComponent(String string, int[] index) {
int length = string.length();
char aChar;
// Skip non-decimal chars
while(index[0] < length && (aChar = string.charAt(index[0])) != '-' &&
!Character.isDigit(aChar) && aChar != '.') {
index[0]++;
}
int start = index[0];
if (start < length && string.charAt(index[0]) == '-') {
index[0]++;
}
while(index[0] < length &&
Character.isDigit(string.charAt(index[0]))) {
index[0]++;
}
if (index[0] < length && string.charAt(index[0]) == '.') {
// Decimal value
index[0]++;
while(index[0] < length &&
Character.isDigit(string.charAt(index[0]))) {
index[0]++;
}
}
if (start != index[0]) {
try {
float value = Float.parseFloat(string.substring
(start, index[0]));
if (index[0] < length && string.charAt(index[0]) == '%') {
index[0]++;
value = value * 255f / 100f;
}
return Math.min(255, Math.max(0, (int)value));
} catch (NumberFormatException nfe) {
// Treat as 0
}
}
return 0;
}
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