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1 String resource
file path: res/values/strings.xml
1.1 String resource definition example
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello! </string>
</resources>
1.2 String resource call Call string resource
in Layout XML:
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
Get string resources in Activity:
this.getString(R.string.
Get a string resource from Application:
application.getString(R.string.hello)
2 Color resource
2.1 Use the constant of the Color class
int color = Color.BLUE; // Create a blue color using the color provided by Android
int color = Color. RED; int color = Color.WHITE;
2.2 is constructed by ARGB,
int color = Color.argb ( 127, 255, 0, 255 ); // semi-transparent purple
where the first parameter means transparent, 0 means fully transparent, 255 (ff) means completely opaque; the last three digits represent the RGB value respectively.
2.3 Use XML resource files to define colors
. This method has good scalability and is easy to modify and share. For example, create a color.xml in the values directory:
<?xml version=” 1.0” encoding=”utf -8”>
<resources>
< color name=”mycolor”> #7fff00ff</color>
</resources>
defines a color named mycolor, which can be obtained by referencing mycolor elsewhere, such as in the textView definition:
android:textColor= "@drawable/mycolor"
2.4 getColor
In Java code, you can use getColor in the ResourceManager class to get the color: int color = getResources().getColor(R.color.mycolor);
This is the same as the value obtained by the second method. The getResources() method returns the current Activity Activity's ResourceManager class instance.
Note: The XML definition method accepts both 6-bit and 8-bit representations, and the beginning must be #, and the first two digits are transparent when 8-bit is defined. 4. Define the color value directly, such as: int color = 0xff00ff00;
this method must start with 0x instead of the # that we commonly use. Unlike method 3, the value must also be represented in 8 bits, and a 6-bit color representation is not accepted. Group 0x|ff|ff00ff, 0x is the mark representing the color integer, ff is the transparency, and ff00ff is the RGB color value.
Add a little background image setting in Android layout (edit LinearLayout):
* You can use solid color: android:background="@drawable/mycolor" (the color defined in the XML resource file)
* You can also use image: android:background="@ drawable/bg" (you need to copy a picture named bg.jpg or png to the res/drawable-hdpi directory)
Color classification:
2.5 System colors
Android built-in colors, such as the colors defined in system resources, include the following :
BLACK (black), BLUE (blue), CYAN (cyan), GRAY (gray), GREEN (green), RED (red), WRITE (white), YELLOW (yellow), etc.
Of course, android's android.graphics.Color also provides a static method for constructing custom colors. Use of
system colors
① Set
Button directly in Java code btn = (Button) findViewById(R.id.btn);
btn.setBackgroundColor(Color.BLUE );
Of course, you can also get the system color and then set it:
int getcolor = Resources.getSystem().getColor(android.R.color.holo_green_light);
Button btn = (Button) findViewById(R.id.btn);
btn. setBackgroundColor(getcolor); ②Use 2.6 custom color
in the layout file The definition of color value is defined by transparency alpha and RGB (red, green and blue) three primary colors, starting with "#", followed by: transparency-red-green -Blue eg: #RGB #ARGB #RRGGBB #AARRGGBB And we use the last two custom colors most often: 2.6.1 Use directly in the xml file Of course, you can also create a new one in the res/values directory The color.xml file, give a name to the color you specify, so that you can use the custom color directly according to the name when you need it
<!--?xml version=1.0 encoding=utf-8?-->
<resources>
<color name="mycolor">#748751</color>
</resources>
2.6.2 Use in Java code
if in The custom color is already defined in res, just call it directly in java code:
int mycolor = getResources().getColor(R.color.mycolor);
Button btn = (Button) findViewById(R.id.btn );
btn.setBackgroundColor(mycolor);
If it is defined directly in the java code, pay attention here, the transparency cannot be omitted! ! ! Like this 0xFF080287, the preceding 0x represents hexadecimal:
int mycolor = 0xff123456;
Button btn = (Button) findViewById(R.id.btn);
btn.setBackgroundColor(mycolor);
2.7 Use the static method argb to set the color:
Button btn = (Button) findViewById(R.id.btn);
btn.setBackgroundColor(Color.argb(0xff, 0x00, 0x00, 0x00));
The parameters of the argb() method are the transparency, the size of red, green, and blue, which can be understood as the concentration, and the combination here is white