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  • Android中attrs.xml文件的使用详解

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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"
            />

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  • 原文地址:https://www.cnblogs.com/roccheung/p/5797446.html
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