Android自定义view三圆环_android 以一个中心点画三个圆圈-优快云博客

本文介绍了一个自定义Android视图的实现案例，通过继承TextView并重写onDraw方法来绘制不同颜色的圆形图案。文章展示了如何设置画笔属性以实现平滑线条，并提供了绘制三个不同颜色和大小的圆形的具体代码。

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package com.bwie.test.liumengxin1508a2017928;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * Created by dell on 2017/9/28.
 */

public class MyCustomView extends TextView {
    private final  Paint paint;
    private final Context context;
    public MyCustomView(Context context, Paint paint, Context context1) {
        super(context);
        this.paint = paint;

        this.context = context1;
    }

    public MyCustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        this.paint = new Paint();
        this.paint.setAntiAlias(true); //消除锯齿
        this.paint.setStyle(Paint.Style.STROKE); //绘制空心圆
    }

    public MyCustomView(Context context, AttributeSet attrs, int defStyleAttr, Paint paint, Context context1) {
        super(context, attrs, defStyleAttr);
        this.paint = paint;
        this.context = context1;
    }

    public MyCustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes, Paint paint, Context context1) {
        super(context, attrs, defStyleAttr, defStyleRes);
        this.paint = paint;
        this.context = context1;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
       Paint p1=new Paint();
        Paint p2=new Paint();
        Paint p3=new Paint();
        int wi=getWidth()/2;
        int he=getHeight()/2;
        p1.setStyle(Paint.Style.STROKE);
        p2.setStyle(Paint.Style.STROKE);
        p3.setStyle(Paint.Style.STROKE);
        p1.setStrokeWidth(5);
        p2.setStrokeWidth(5);
        p3.setStrokeWidth(5);
        p1.setColor(Color.RED);
        p2.setColor(Color.YELLOW);
        p3.setColor(Color.BLUE);
        canvas.drawCircle(wi-150,he-150,130,p1);
        canvas.drawCircle(wi-30,he-30,100,p2);
        canvas.drawCircle(wi+50,he+50,70,p3);


    }
    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}
效果