自定义控件属性TypedArray和attrs.xml和AttributeSet

时间:2021-10-23 20:36:54

http://5200415.blog.51cto.com/3851969/1012267

 

TypedArray和attrs.xml和AttributeSet这一系列都是自定义控件属性时要用到的内容。

首先说说attrs.xml:它是定义成类似于这种形式的。

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

1.主要讲讲里面的format属性:

. 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"
  5. />

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:

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

⑥. integer:整型值。

(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"

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. </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. />

下面是一个布局文件:

 
 
  1. <?xml
  2. version="1.0" encoding="utf-8"?>
  3. <LinearLayout
  4. xmlns:android="http://schemas.android.com/apk/res/android"
  5. //自定义的View的路径为com.xc.demo
  6. xmlns:test="http://schemas.android.com/apk/res/com.xc.demo"
  7. android:orientation="vertical"
  8. android:layout_width="fill_parent"
  9. android:layout_height="fill_parent"
  10. >
  11. <TextView
  12. android:layout_width="fill_parent"
  13. android:layout_height="wrap_content"
  14. android:text="@string/hello"
  15. />
  16. <com.xc.demo.MyView
  17. android:layout_width="fill_parent"
  18. android:layout_height="fill_parent"
  19. //这里引用 改变字体和颜色 textColor和textSize都是根据前面的attrs.xml文件设置的
  20. test:textSize="100dp"
  21. test:textColor="#ff0000"
  22. />
  23. </LinearLayout>

2.TypedArray的作用是在代码中设置。

 
 
  1. public MyView(Context context, AttributeSet attrs) {
  2. this(context);
  3. TypedArray a = context
  4. .obtainStyledAttributes(attrs, R.styleable.MyView);
  5. int color = a.getColor(R.styleable.MyView_textColor, 0XFF0000FF);
  6. float size = a.getDimension(R.styleable.MyView_textSize, 50);
  7. mPaint.setColor(color);
  8. mPaint.setTextSize(size);
  9. a.recycle();
  10. }

R.styleable.MyView是attrs.xml中<declare-styleable name="MyView">的名字

具体的设置是依靠名字+"_"+名字得到来设置的。

3.如果代码和xml中都设置了,一般以xml中设置为先。