本文实例为大家分享了Android自定义View画圆的具体代码，供大家参考，具体内容如下

引入布局

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/activity_main"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.bwie.test.xuejian1508a20170928.MainActivity">

android:layout_width="match_parent"

android:layout_height="match_parent"

/>

自定义View的java类，继承View

public class ViView extends View{

Paint paint;

Context context;

//构造方法

public ViView(Context context) {

super(context);

}

public ViView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public ViView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

}

public ViView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

this.context=context;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

@Override

protected void onLayout(boolean changed, int left, int top, int right, int bottom) {

super.onLayout(changed, left, top, right, bottom);

}

/*绘图*/

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

//得到屏幕宽高

int width = getWidth();

int radius = width - 450/2;

int height = getHeight();

// 创建画笔

Paint paint1 = new Paint();

Paint paint2 = new Paint();

Paint paint3= new Paint();

// 消除锯齿

paint1.setAntiAlias(true);

paint2.setAntiAlias(true);

paint3.setAntiAlias(true);

//画笔颜色

paint1.setColor(Color.RED);

paint2.setColor(Color.WHITE);

paint3.setColor(Color.BLUE);

// 画圆。确定位置

// canvas.drawRect(100,100,width/2,height/2,paint1);

// canvas.drawCircle(100,100,100,paint1);

// canvas.drawCircle(250,250,200,paint2);

// canvas.drawCircle(500,500,300,paint3);

//设置圆环形状和大小

RectF oval = new RectF(width-radius,width-radius,width+radius,width+radius);

paint1.setStrokeWidth(450);

canvas.drawArc(oval,-90,90,false,paint1);

canvas.drawCircle(width/2,height/2,450,paint1);

canvas.drawCircle(width/2,height/2,300,paint2);

canvas.drawCircle(width/2,height/2,200,paint3);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

return super.onTouchEvent(event);

}

}

效果图：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。