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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:
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MyView"> <attr name="textColor" format="color" /> <attr name="textSize" format="dimension" /> </declare-styleable> </resources>
定义的组件MyView:
package com.jiangwei.demo; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Rect; import android.util.AttributeSet; import android.view.View; public class MyView extends View { private Paint mPaint; private static final String mString = "Welcome to Mr Wei's blog"; public MyView(Context context) { super(context); mPaint = new Paint(); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); mPaint = new Paint(); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyView); int textColor = a.getColor(R.styleable.MyView_textColor, 0XFFFFFFFF); float textSize = a.getDimension(R.styleable.MyView_textSize, 36); mPaint.setTextSize(textSize); mPaint.setColor(textColor); a.recycle(); } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); // 设置填充 mPaint.setStyle(Style.FILL); // 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 canvas.drawRect(new Rect(10, 10, 100, 100), mPaint); mPaint.setColor(Color.BLUE); // 绘制文字 canvas.drawText(mString, 10, 110, mPaint); } }
main.xml内容:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:test="http://schemas.android.com/apk/res/com.jiangwei.demo"//一定记得添加前缀 android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <com.jiangwei.demo.MyView android:layout_width="fill_parent" android:layout_height="fill_parent" test:textSize="20px"//test是个前缀 test:textColor="#ffffff"/> </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:
<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" />