Android自定义 view属性

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第一种

/MainActivity/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyCircle">        <attr name="radius" format="integer"/>        <attr name="mycolor" format="reference|color"/>    </declare-styleable></resources>

/MainActivity/src/com/ch/myviews/MyCircle.java

package com.ch.myviews;import com.ch.myviewattr.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;public class MyCircle extends View {    private Paint paint;    private int radius;       public MyCircle(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub        //获得自定义的属性，即获得自定义的半径        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.MyCircle);        radius = ta.getInt(R.styleable.MyCircle_radius, 0);                  }    //绘制的方法    @Override    protected void onDraw(Canvas canvas) {        // TODO Auto-generated method stub        paint = new Paint();        paint.setColor(Color.RED);        //        canvas.drawColor(Color.BLACK);        canvas.drawCircle(getMeasuredWidth()/2, getMeasuredHeight()/2, radius, paint);        super.onDraw(canvas);    }        }

/MainActivity/res/layout/activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:myattr="http://schemas.android.com/apk/res/com.ch.myviewattr"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <com.ch.myviews.MyCircle        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        myattr:radius="200"        /></RelativeLayout>

第二种

/MainActivity/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="MyCircle">        <attr name="radius" format="integer"/>        <attr name="mycolor" format="reference|color"/>    </declare-styleable></resources>

/MainActivity/src/com/ch/myviews/MyCircle.java

package com.ch.myviews;import com.ch.myviewattr.R;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;public class MyCircle extends View {    private Paint paint;    private int radius;    private final static String NAMESPACE = "aaa1407a";    public MyCircle(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub        //获得自定义的属性，即获得自定义的半径            radius = attrs.getAttributeIntValue(NAMESPACE, "radius", 0);    }    //绘制的方法    @Override    protected void onDraw(Canvas canvas) {        // TODO Auto-generated method stub        paint = new Paint();        paint.setColor(Color.RED);        //        canvas.drawColor(Color.BLACK);        canvas.drawCircle(getMeasuredWidth()/2, getMeasuredHeight()/2, radius, paint);        super.onDraw(canvas);    }        }

/MainActivity/res/layout/activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:myattr="aaa1407a"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <com.ch.myviews.MyCircle        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        myattr:radius="200"        /></RelativeLayout>

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