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。
- <?xml version="1.0" encoding="utf-8"?>
- <resources>
- <declare-styleable name="MyView">
- <attr name="textColor" format="color"></attr>
- <attr name="textSize" format="dimension" />
- </declare-styleable>
- </resources>
1.主要讲讲里面的format属性:
①. reference:参考某一资源ID。
(1)属性定义:
- <declare-styleable name = "名称">
- <attr name = "background" format = "reference" />
- </declare-styleable>
(2)属性使用:
- <ImageView
- android:layout_width = "42dip"
- android:layout_height = "42dip"
- android:background = "@drawable/图片ID"
- />
②. color:颜色值。
(1)属性定义:
- <declare-styleable name = "名称">
- <attr name = "textColor" format = "color" />
- </declare-styleable>
(2)属性使用:
- <TextView
- android:layout_width = "42dip"
- android:layout_height = "42dip"
- android:textColor = "#00FF00"
- />
③. boolean:布尔值。
(1)属性定义:
- <declare-styleable name = "名称">
- <attr name = "focusable" format = "boolean" />
- </declare-styleable>
(2)属性使用:
- <Button
- android:layout_width = "42dip"
- android:layout_height = "42dip"
- android:focusable = "true"
- />
④. dimension:尺寸值。
(1)属性定义:
- <declare-styleable name = "名称">
- <attr name = "layout_width" format = "dimension" />
- </declare-styleable>
(2)属性使用:
- <Button
- android:layout_width = "42dip"
- android:layout_height = "42dip"
- />
⑤. float:浮点值。
(1)属性定义:
- <declare-styleable name = "AlphaAnimation">
- <attr name = "fromAlpha" format = "float" />
- <attr name = "toAlpha" format = "float" />
- </declare-styleable>
(2)属性使用:
- <alpha
- android:fromAlpha = "1.0"
- android:toAlpha = "0.7"
- />
⑥. integer:整型值。
(1)属性定义:
- <declare-styleable name = "AnimatedRotateDrawable">
- <attr name = "visible" />
- <attr name = "frameDuration" format="integer" />
- <attr name = "framesCount" format="integer" />
- <attr name = "pivotX" />
- <attr name = "pivotY" />
- <attr name = "drawable" />
- </declare-styleable>
(2)属性使用:
- <animated-rotate
- xmlns:android = "http://schemas.android.com/apk/res/android"
- android:drawable = "@drawable/图片ID"
- android:pivotX = "50%"
- android:pivotY = "50%"
- android:framesCount = "12"
- android:frameDuration = "100"
⑦. string:字符串。
(1)属性定义:
- <declare-styleable name = "MapView">
- <attr name = "apiKey" format = "string" />
- </declare-styleable>
(2)属性使用:
- <com.google.android.maps.MapView
- android:layout_width = "fill_parent"
- android:layout_height = "fill_parent"
- android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
- />
⑧. fraction:百分数。
(1)属性定义:
- <declare-styleable name="RotateDrawable">
- <attr name = "visible" />
- <attr name = "fromDegrees" format = "float" />
- <attr name = "toDegrees" format = "float" />
- <attr name = "pivotX" format = "fraction" />
- <attr name = "pivotY" format = "fraction" />
- <attr name = "drawable" />
- </declare-styleable>
(2)属性使用:
- <rotate
- xmlns:android = "http://schemas.android.com/apk/res/android"
- android:interpolator = "@anim/动画ID"
- android:fromDegrees = "0"
- android:toDegrees = "360"
- android:pivotX = "200%"
- android:pivotY = "300%"
- android:duration = "5000"
- android:repeatMode = "restart"
- android:repeatCount = "infinite"
- />
⑨. enum:枚举值。
(1)属性定义:
- <declare-styleable name="名称">
- <attr name="orientation">
- <enum name="horizontal" value="0" />
- <enum name="vertical" value="1" />
- </attr>
- </declare-styleable>
(2)属性使用:
- <LinearLayout
- xmlns:android = "http://schemas.android.com/apk/res/android"
- android:orientation = "vertical"
- android:layout_width = "fill_parent"
- android:layout_height = "fill_parent"
- >
- </LinearLayout>
10. flag:位或运算。
(1)属性定义:
- <declare-styleable name="名称">
- <attr name="windowSoftInputMode">
- <flag name = "stateUnspecified" value = "0" />
- <flag name = "stateUnchanged" value = "1" />
- <flag name = "stateHidden" value = "2" />
- <flag name = "stateAlwaysHidden" value = "3" />
- <flag name = "stateVisible" value = "4" />
- <flag name = "stateAlwaysVisible" value = "5" />
- <flag name = "adjustUnspecified" value = "0x00" />
- <flag name = "adjustResize" value = "0x10" />
- <flag name = "adjustPan" value = "0x20" />
- <flag name = "adjustNothing" value = "0x30" />
- </attr>
- </declare-styleable>
(2)属性使用:
- <activity
- android:name = ".StyleAndThemeActivity"
- android:label = "@string/app_name"
- android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">
- <intent-filter>
- <action android:name = "android.intent.action.MAIN" />
- <category android:name ="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
注意:
属性定义时可以指定多种类型值。
(1)属性定义:
- <declare-styleable name = "名称">
- <attr name = "background" format = "reference|color" />
- </declare-styleable>
(2)属性使用:
- <ImageView
- android:layout_width = "42dip"
- android:layout_height = "42dip"
- android:background = "@drawable/图片ID|#00FF00"
- />
下面是一个布局文件:
- <?xml
- version="1.0" encoding="utf-8"?>
- <LinearLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- //自定义的View的路径为com.xc.demo
- xmlns:test="http://schemas.android.com/apk/res/com.xc.demo"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/hello"
- />
- <com.xc.demo.MyView
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- //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
- test:textSize="100dp"
- test:textColor="#ff0000"
- />
- </LinearLayout>
2.TypedArray的作用是在代码中设置。
- public MyView(Context context, AttributeSet attrs) {
- this(context);
- TypedArray a = context
- .obtainStyledAttributes(attrs, R.styleable.MyView);
- int color = a.getColor(R.styleable.MyView_textColor, 0XFF0000FF);
- float size = a.getDimension(R.styleable.MyView_textSize, 50);
- mPaint.setColor(color);
- mPaint.setTextSize(size);
- a.recycle();
- }
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。