Android中attrs.xml文件的使用详解

Android中在values中定义一个attrs.xml，然后自己定义一个组件MyView

attrs.xml内容如下:

1. <?xml version="1.0" encoding="utf-8"?>
2. <resources>
3. <declare-styleable name="MyView">
4. <attr name="textColor" format="color" />
5. <attr name="textSize" format="dimension" />
6. </declare-styleable>
7. </resources>

定义的组件MyView:

1. package com.jiangwei.demo;  
2.   
3. import android.content.Context;  
4. import android.content.res.TypedArray;  
5. import android.graphics.Canvas;  
6. import android.graphics.Color;  
7. import android.graphics.Paint;  
8. import android.graphics.Paint.Style;  
9. import android.graphics.Rect;  
10. import android.util.AttributeSet;  
11. import android.view.View;  
12.   
13. public class MyView extends View {  
14. private Paint mPaint;  
15. private static final String mString = "Welcome to Mr Wei's blog";  
16. public MyView(Context context) {  
17. super(context);  
18. mPaint = new
19. }  
20.   
21. public MyView(Context context, AttributeSet attrs) {  
22. super(context, attrs);  
23. mPaint = new
24. TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyView);  
25. int textColor = a.getColor(R.styleable.MyView_textColor, 0XFFFFFFFF);  
26. float textSize = a.getDimension(R.styleable.MyView_textSize, 36);  
27. mPaint.setTextSize(textSize);  
28. mPaint.setColor(textColor);  
29. a.recycle();  
30. }  
31.   
32. @Override  
33. protected void onDraw(Canvas canvas) {  
34. // TODO Auto-generated method stub  
35. super.onDraw(canvas);  
36. // 设置填充  
37. mPaint.setStyle(Style.FILL);  
38. // 画一个矩形,前俩个是矩形左上角坐标，后面俩个是右下角坐标  
39. canvas.drawRect(new Rect(10, 10, 100, 100), mPaint);  
40. mPaint.setColor(Color.BLUE);  
41. // 绘制文字  
42. canvas.drawText(mString, 10, 110, mPaint);  
43. }  
44. }

main.xml内容:

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout
3. xmlns:android="http://schemas.android.com/apk/res/android"
4. xmlns:test="http://schemas.android.com/apk/res/com.jiangwei.demo"//一定记得添加前缀  
5. android:layout_width="fill_parent"
6. android:layout_height="fill_parent"
7. android:orientation="vertical" >
8. <com.jiangwei.demo.MyView
9. android:layout_width="fill_parent"
10. android:layout_height="fill_parent"
11. test:textSize="20px"//test是个前缀  
12. test:textColor="#ffffff"/>
13. </LinearLayout>

具体内容:

格式如上，其中“xmlns:wen”冒号后面是标签名，在下面使用时(只对当前文件可用)
<TextView  wen:属性名/>
“com.iteye.googlers”是你的工程包名。
1. reference：参考某一资源ID。
    （1）属性定义：
            

1. <declare-styleable name = "名称">
2. <attr name = "background" format = "reference" />
3. </declare-styleable>

    （2）属性使用：

1. <ImageView
2. android:layout_width = "42dip"
3. android:layout_height = "42dip"
4. android:background = "@drawable/图片ID"
5. />

2. color：颜色值。
    （1）属性定义：
            

1. <declare-styleable name = "名称">
2. <attr name = "textColor" format = "color" />
3. </declare-styleable>

    （2）属性使用：

1. <TextView
2. android:layout_width = "42dip"
3. android:layout_height = "42dip"
4. android:textColor = "#00FF00"
5. />

 3. boolean：布尔值。

    （1）属性定义：

1. <declare-styleable name = "名称">
2. <attr name = "focusable" format = "boolean" />
3. </declare-styleable>

    （2）属性使用：

1. <Button
2. android:layout_width = "42dip"
3. android:layout_height = "42dip"
4. android:focusable = "true"/>

4. dimension：尺寸值。

     （1）属性定义：

              

1. <declare-styleable name = "名称">
2. <attr name = "layout_width" format = "dimension" />
3. </declare-styleable>

    （2）属性使用：

            

1. <Button
2. android:layout_width = "42dip"
3. android:layout_height = "42dip"
4. />

 5. float：浮点值。

    （1）属性定义：

1. <declare-styleable name = "AlphaAnimation">
2. <attr name = "fromAlpha" format = "float" />
3. <attr name = "toAlpha" format = "float" />
4. </declare-styleable>

    （2）属性使用：

6. integer：整型值。

1. <alpha
2. android:fromAlpha = "1.0"
3. android:toAlpha = "0.7"
4. />

    （1）属性定义：

            

1. <declare-styleable name = "AnimatedRotateDrawable">
2. <attr name = "visible" />
3. <attr name = "frameDuration" format="integer" />
4. <attr name = "framesCount" format="integer" />
5. <attr name = "pivotX" />
6. <attr name = "pivotY" />
7. <attr name = "drawable" />
8. </declare-styleable>

    （2）属性使用：

1. <animated-rotate
2. xmlns:android = "http://schemas.android.com/apk/res/android"
3. android:drawable = "@drawable/图片ID"
4. android:pivotX = "50%"
5. android:pivotY = "50%"
6. android:framesCount = "12"
7. android:frameDuration = "100"
8. />

7. string：字符串。

    （1）属性定义：

            

1. <declare-styleable name = "MapView">
2. <attr name = "apiKey" format = "string" />
3. </declare-styleable>

    （2）属性使用：

            

1. <com.google.android.maps.MapView
2. android:layout_width = "fill_parent"
3. android:layout_height = "fill_parent"
4. android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
5. />

8. fraction：百分数。

     （1）属性定义：

1. <declare-styleable name="RotateDrawable">
2. <attr name = "visible" />
3. <attr name = "fromDegrees" format = "float" />
4. <attr name = "toDegrees" format = "float" />
5. <attr name = "pivotX" format = "fraction" />
6. <attr name = "pivotY" format = "fraction" />
7. <attr name = "drawable" />
8. </declare-styleable>

    （2）属性使用：

            

1. <rotate
2. xmlns:android = "http://schemas.android.com/apk/res/android"
3. android:interpolator = "@anim/动画ID"
4. android:fromDegrees = "0"
5. android:toDegrees = "360"
6. android:pivotX = "200%"
7. android:pivotY = "300%"
8. android:duration = "5000"
9. android:repeatMode = "restart"
10. android:repeatCount = "infinite"
11. />

9. enum：枚举值。

    （1）属性定义：

            

1. <declare-styleable name="名称">
2. <attr name="orientation">
3. <enum name="horizontal" value="0" />
4. <enum name="vertical" value="1" />
5. </attr>
6. </declare-styleable>

    （2）属性使用：

1. <LinearLayout
2. xmlns:android = "http://schemas.android.com/apk/res/android"
3. android:orientation = "vertical"
4. android:layout_width = "fill_parent"
5. android:layout_height = "fill_parent"
6. >
7. </LinearLayout>

10. flag：位或运算。

     （1）属性定义：

1. <declare-styleable name="名称">
2. <attr name="windowSoftInputMode">
3. <flag name = "stateUnspecified" value = "0" />
4. <flag name = "stateUnchanged" value = "1" />
5. <flag name = "stateHidden" value = "2" />
6. <flag name = "stateAlwaysHidden" value = "3" />
7. <flag name = "stateVisible" value = "4" />
8. <flag name = "stateAlwaysVisible" value = "5" />
9. <flag name = "adjustUnspecified" value = "0x00" />
10. <flag name = "adjustResize" value = "0x10" />
11. <flag name = "adjustPan" value = "0x20" />
12. <flag name = "adjustNothing" value = "0x30" />
13. </attr>
14. lt;/declare-styleable>

     （2）属性使用：

            

1. <activity
2. android:name = ".StyleAndThemeActivity"
3. android:label = "@string/app_name"
4. android:windowSoftInputMode = "stateUnspecified | stateUnchanged　|　stateHidden">
5. <intent-filter>
6. <action android:name = "android.intent.action.MAIN" />
7. <category android:name = "android.intent.category.LAUNCHER" />
8. </intent-filter>
9. </activity>

     注意：

     属性定义时可以指定多种类型值。

    （1）属性定义：

            

1. <declare-styleable name = "名称">
2. <attr name = "background" format = "reference|color" />
3. </declare-styleable>

    （2）属性使用：

             

1. <ImageView
2. android:layout_width = "42dip"
3. android:layout_height = "42dip"
4. android:background = "@drawable/图片ID|#00FF00"
5. />