安卓31作业 - 绘制

任务1：绘制自定义视图

1.编写MainActivity

2.创建CustomView

（1）编写CustomView进行绘画

package net.zxj.hwork31_1;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.View;

public class CustomView extends View {

    private Paint paint; // 画笔
    private int screenWidth; // 屏幕宽度
    private int screenHeight; // 屏幕高度
    private Path path;

    public CustomView(Context context) {
        super(context);
        // 实例化画笔
        paint = new Paint();
        // 设置画笔防锯齿形
        paint.setAntiAlias(true);

        // 获取屏幕宽度
        screenWidth = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth();
        // 获取屏幕高度
        screenHeight = ((Activity) context).getWindowManager().getDefaultDisplay().getHeight();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        /**
         *  图像1：H
          */

        paint.setColor(Color.rgb(218,112,214));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(new Rect(50,50,100,300),paint);

        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(new Rect(100,150,200,200),paint);

        paint.setColor(Color.rgb(218,112,214));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(new Rect(200,50,250,300),paint);

        /**
         * 图像2 ： 表情
         */

        paint.setColor(Color.YELLOW);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(700,200,150,paint);

        // 右眼睛
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(800,150,20,paint);
        // 左眼睛
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(670,150,20,paint);

        // 嘴巴
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawArc(new RectF(800,200,700,300),0,360,true,paint);


        /**
         *  图像3：兔子
         *
         */

        // 耳朵
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        canvas.drawArc(new RectF(40,300,150,600),0,360,true,paint);

        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        canvas.drawArc(new RectF(210,300,320,600),0,360,true,paint);

        // 脸
        paint.setColor(Color.BLACK);
        canvas.drawCircle(170,600,150,paint);

        paint.setColor(Color.WHITE);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(170,600,150,paint);

        // 眼睛
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(110,560,15,paint);
        canvas.drawCircle(230,560,15,paint);

        // 嘴巴
        paint.setColor(Color.BLACK);
        canvas.drawLine(100,630,240,630,paint);

        // 牙齿
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        canvas.drawRect(140,630,200,670,paint);
        canvas.drawLine(170,630,170,670,paint);

        /**
         * 任务4：小人
         */
        // 背景
        paint.setColor(Color.rgb(255,105,180));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(400,400,1000,1000,paint);
        // 小人身体
        paint.setColor(Color.rgb(153,50,204));
        Path path = new Path();
        path.moveTo(700,600);
        path.lineTo(550,1000);
        path.lineTo(850,1000);
        path.lineTo(700,600);
        path.close();
        canvas.drawPath(path,paint);

        // 小人双手
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(550,800,30,paint);
        canvas.drawCircle(850,800,30,paint);
        // 小人头部
        paint.setColor(Color.rgb(255,140,0));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(700,620,160,paint);

        paint.setColor(Color.rgb(255,69,0));
        // 设置笔划宽度
        paint.setStrokeWidth(5);
        canvas.drawLine(545,590,850,590,paint);

        // 眼睛片
        paint.setColor(Color.YELLOW);
        canvas.drawRect(600,570,680,620,paint);
        canvas.drawRect(720,570,800,620,paint);
        // 眼眶
        paint.setColor(Color.rgb(255,140,0));
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(10);
        canvas.drawArc(new RectF(610,580,670,610),0,360,true,paint);
        canvas.drawArc(new RectF(730,580,790,610),0,360,true,paint);

        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawArc(new RectF(610,580,670,610),0,360,true,paint);
        canvas.drawArc(new RectF(730,580,790,610),0,360,true,paint);

        // 嘴巴
        paint.setColor(Color.rgb(255,69,0));
        paint.setStrokeWidth(4);
        canvas.drawLine(670,730,780,680,paint);

        /**
         * 任务5：彩色小球
         */
        // 背景色
        paint.setColor(Color.rgb(153,50,204));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(50,1100,500,1600,paint);

        // 黄色小球
        paint.setColor(Color.YELLOW);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(275,1250,45,paint);
        // 红色小球
        paint.setColor(Color.BLACK);
        canvas.drawLine(275,1160,275,1190,paint);
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(275,1200,20,paint);
        // 青色小球
        paint.setColor(Color.rgb(0,255,255));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(275,1300,45,paint);

        // 紫色小球
        paint.setColor(Color.rgb(255,0,255));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(275,1350,45,paint);

        // 矩形木箱
        paint.setColor(Color.rgb(222,184,135));
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(210,1380,350,1520,paint);

        /**
         * 任务6：云和太阳
         */
        // 背景色

        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(550,1150,1050,1700,paint);
        paint.setColor(Color.GREEN);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(550,1600,1050,1700,paint);

        // 太阳
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(660,1250,73,paint);

        // 白云
        paint.setColor(Color.WHITE);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawArc(new RectF(700,1240,860,1350),0,360,true,paint);
        canvas.drawArc(new RectF(760,1260,960,1380),0,360,true,paint);
        canvas.drawArc(new RectF(760,1200,960,1300),0,360,true,paint);
        canvas.drawArc(new RectF(900,1230,1040,1350),0,360,true,paint);

    }
}

运行效果如下：

任务2：