【移动应用开发技术】怎么在Android中绘制一个弧形

【移动应用开发技术】怎么在Android中绘制一个弧形

怎么在Android中绘制一个弧形？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。具体如下：public

class

ArcsActivity

extends

Activity

{

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(new

SampleView(this));

}

/**

*

自定义绘制图案的View

*

*

@description：

*

@author

ldm

*

@date

2016-4-25

下午4:19:40

*/

private

static

class

SampleView

extends

View

{

//

画圆形图案的画笔数组

private

Paint[]

mPaints;

//

画矩形的画笔

private

Paint

mFramePaint;

//

是否以矩形中心画图

private

boolean[]

mUseCenters;

//

矩形框数组

private

RectF[]

mOvals;

//

上面较大的矩形框

private

RectF

mBigOval;

//

画圆弧起点

private

float

mStart;

//

画圆弧角度

private

float

mSweep;

//

画大图形对应角标index

private

int

mBigIndex;

//

角度变化增量

private

static

final

float

ANGLE_STEP

=

3;

//

初始角度

private

static

final

float

START_ANGLE

=

15;

public

SampleView(Context

context)

{

super(context);

mPaints

=

new

Paint[4];

mUseCenters

=

new

boolean[4];

mOvals

=

new

RectF[4];

mPaints[0]

=

new

Paint();

mPaints[0].setAntiAlias(true);//

设置抗紧钜齿

mPaints[0].setStyle(Paint.Style.FILL);//

设置画笔填充风格

mPaints[0].setColor(0x88FF0000);//

设置颜色

mUseCenters[0]

=

false;

mPaints[1]

=

new

Paint(mPaints[0]);

mPaints[1].setColor(0x8800FF00);

mUseCenters[1]

=

true;

mPaints[2]

=

new

Paint(mPaints[0]);

mPaints[2].setStyle(Paint.Style.STROKE);//

设置画笔空心风格

mPaints[2].setStrokeWidth(4);//

设置画笔宽度

mPaints[2].setColor(0x880000FF);//

设置颜色

mUseCenters[2]

=

false;

mPaints[3]

=

new

Paint(mPaints[2]);

mPaints[3].setColor(0x88888888);

mUseCenters[3]

=

true;

mBigOval

=

new

RectF(40,

10,

280,

250);//

初始化较大的矩形

mOvals[0]

=

new

RectF(10,

270,

70,

330);//

初始化4个较小矩形

mOvals[1]

=

new

RectF(90,

270,

150,

330);

mOvals[2]

=

new

RectF(170,

270,

230,

330);

mOvals[3]

=

new

RectF(250,

270,

310,

330);

mFramePaint

=

new

Paint();

mFramePaint.setAntiAlias(true);

mFramePaint.setStyle(Paint.Style.STROKE);

mFramePaint.setStrokeWidth(0);

}

@Override

protected

void

onDraw(Canvas

canvas)

{

canvas.drawColor(Color.WHITE);

//

画大矩形

canvas.drawRect(mBigOval,

mFramePaint);

//

在大矩形分别

画4个圆弧图形

canvas.drawArc(mBigOval,

mStart,

mSweep,

mUseCenters[mBigIndex],

mPaints[mBigIndex]);

for

(int

i

=

0;

i

<

4;

i++)

{

canvas.drawRect(mOvals[i],

mFramePaint);//

画四个小矩形

canvas.drawArc(mOvals[i],

mStart,

mSweep,

mUseCenters[i],//

在四个小矩形中分别画圆弧

mPaints[i]);

}

mSweep

+=

ANGLE_STEP;//

弧度改变

if

(mSweep

>

360)

{//

弧度控制

mSweep

-=

360;

mStart

+=

START_ANGLE;

if

(mStar