本文實例講述了Android編程繪圖操作之弧形繪制方法。分享給大家供大家參考，具體如下：

/**

* 繪制弧形圖案

* @description：

* @author ldm

* @date 2016-4-25 下午4:37:01

*/

public class ArcsActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(new SampleView(this));

}

/**

* 自定義繪制圖案的View

*

* @description：

* @author ldm

* @date 2016-4-25 下午4:19:40

*/

private static class SampleView extends View {

// 畫圓形圖案的畫筆數組

private Paint[] mPaints;

// 畫矩形的畫筆

private Paint mFramePaint;

// 是否以矩形中心畫圖

private boolean[] mUseCenters;

// 矩形框數組

private RectF[] mOvals;

// 上面較大的矩形框

private RectF mBigOval;

// 畫圓弧起點

private float mStart;

// 畫圓弧角度

private float mSweep;

// 畫大圖形對應角標index

private int mBigIndex;

// 角度變化增量

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);// 設置抗緊鉅齒

mPaints[0].setStyle(Paint.Style.FILL);// 設置畫筆填充風格

mPaints[0].setColor(0x88FF0000);// 設置顏色

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);// 設置畫筆空心風格

mPaints[2].setStrokeWidth(4);// 設置畫筆寬度

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

mUseCenters[2] = false;

mPaints[3] = new Paint(mPaints[2]);

mPaints[3].setColor(0x88888888);

mUseCenters[3] = true;

mBigOval = new RectF(40, 10, 280, 250);// 初始化較大的矩形

mOvals[0] = new RectF(10, 270, 70, 330);// 初始化4個較小矩形

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);

// 畫大矩形

canvas.drawRect(mBigOval, mFramePaint);

// 在大矩形分別 畫4個圓弧圖形

canvas.drawArc(mBigOval, mStart, mSweep, mUseCenters[mBigIndex],

mPaints[mBigIndex]);

for (int i = 0; i < 4; i++) {

canvas.drawRect(mOvals[i], mFramePaint);// 畫四個小矩形

canvas.drawArc(mOvals[i], mStart, mSweep, mUseCenters[i],// 在四個小矩形中分別畫圓弧

mPaints[i]);

}

mSweep += ANGLE_STEP;// 弧度改變

if (mSweep > 360) {// 弧度控制

mSweep -= 360;

mStart += START_ANGLE;

if (mStart >= 360) {

mStart -= 360;

}

mBigIndex = (mBigIndex + 1) % mOvals.length;

}

invalidate();

}

}

}

靜態效果如圖：

希望本文所述對大家Android程序設計有所幫助。

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