Android attrs文件（自定义）属性详解

亦凉 2022-07-24 05:05 320阅读 0赞

在res/values文件夹下新建attrs.xml文件：

<declare-styleable name="MyView">
        <attr name="a" format="integer"></attr>
        <attr name="b" format="boolean"></attr>
        <attr name="c" format="color"></attr>
        <attr name="d" format="dimension"></attr>
        <attr name="e"></attr>
        <attr name="f"></attr>
        <attr name="g" format="float"></attr>
        <attr name="h" format="fraction"></attr>
        <attr name="i" format="reference"></attr>
        <attr name="j" format="string"></attr>
    </declare-styleable>
    <attr name="e">
        <enum name="e1" value="1"></enum>
        <enum name="e2" value="2"></enum>
    </attr>
    <attr name="f">
        <flag name="f1" value="1"></flag>
        <flag name="f2" value="2"></flag>
    </attr>

使用：

<wkk.demo4.MyView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:a="1"
    app:b="true"
    app:c="#ffffff"
    app:d="20dp"
    app:e="e1"
    app:f="f1|f2"
    app:g="0.1"
    app:h="100%"
    app:i="@mipmap/ic_launcher"
    app:j="字符串" />

获取：

package wkk.demo4;
    
    import android.content.Context;
    import android.content.res.TypedArray;
    import android.util.AttributeSet;
    import android.view.View;
    
    /**
     * Created by wkk on 2016/5/13.
     */
    public class MyView extends View {
    
    
        public MyView(Context context, AttributeSet attrs) {
            super(context, attrs);
            TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyView);
            int a = typedArray.getInt(R.styleable.MyView_a, 0);
            boolean b = typedArray.getBoolean(R.styleable.MyView_b, true);
            int c = typedArray.getColor(R.styleable.MyView_c, 0x00000000);
            int d = typedArray.getDimensionPixelSize(R.styleable.MyView_d, 0);
            int e = typedArray.getInt(R.styleable.MyView_e, 0);
            int f = typedArray.getInt(R.styleable.MyView_f, 0);
            float g = typedArray.getFloat(R.styleable.MyView_g, 0.1f);
            String h = typedArray.getString(R.styleable.MyView_h);
            int i = typedArray.getResourceId(R.styleable.MyView_i, -1);
            String j = typedArray.getString(R.styleable.MyView_j);
            typedArray.recycle();
        }
    }