TypedArray和attrs.xml

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./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./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./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./apk/res/android"
//自定义的View的路径为com.xc.demo
xmlns:test="http://schemas./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。