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创建安卓应用

创建custom

定义变量

构造方法，初始化画笔

绘制方法–绘制兔子

package net.zjs.draw_circle_view;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;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    /*    * 构造方法--初始化画笔    * */    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);//        //设置画笔颜色//        paint.setColor(Color.BLACK);        //获取屏幕宽度        screenWidth=((Activity) context).getWindowManager().getDefaultDisplay().getWidth();        //获取屏幕高度        screenHeight=((Activity) context).getWindowManager().getDefaultDisplay().getHeight();    }    /*    * 绘制方法    * 绘制兔子*/    protected void onDraw(Canvas canvas){        super.onDraw(canvas);        //设置画笔颜色--黑色        paint.setColor(Color.BLACK);        //        paint.setStyle(Paint.Style.STROKE);        //绘制椭圆(设置其大小)--左耳朵        canvas.drawArc(new RectF(200,200,400,1000),0,360,true,paint);        //绘制椭圆（右耳朵）        canvas.drawArc(new RectF(700,200,900,1000),0,360,true,paint);        //绘制圆（脸）        paint.setColor(Color.WHITE);        paint.setStyle(Paint.Style.FILL);        canvas.drawCircle(550,1200,500,paint);        paint.setColor(Color.BLACK);        paint.setStyle(Paint.Style.STROKE);//空心圆        canvas.drawCircle(550,1200,500,paint);        //绘制实心圆（眼睛）        paint.setStyle(Paint.Style.FILL);        canvas.drawCircle(350,1100,40,paint);        canvas.drawCircle(750,1100,40,paint);        //直线（嘴）        canvas.drawLine(300,1400,800,1400,paint);        //矩形（牙齿）        paint.setStyle(Paint.Style.STROKE);        canvas.drawRect(new Rect(400,1500,500,1400),paint);        canvas.drawRect(new Rect(600,1500,700,1400),paint);    }}

编写主界面类

package net.zjs.draw_circle_view;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity {    private CustomView mCustomview;//声明自定义视图    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //实例化自定义视图        mCustomview=new CustomView(this);        //将自定义视图设置为用户界面        setContentView(mCustomview);    }}

运行效果

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