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这篇文章主要讲解了“Android怎么自定义view实现科技感的仪表盘”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Android怎么自定义view实现科技感的仪表盘”吧！
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View 需要用到发光的效果，我们采用 shader 来实现，那么我们需要首先关闭硬件加速。
// 关闭硬件加速 setLayerType(LAYER_TYPE_SOFTWARE, null);
1. 绘制一个发光的弧形
canvas.translate(getPaddingLeft() + radiusDial, getPaddingTop() + radiusDia
arcPaint.setShader(null); arcPaint.setStyle(Paint.Style.STROKE); arcPaint.setAntiAlias(true); arcPaint.setAlpha(70); arcPaint.setStyle(Paint.Style.STROKE); arcPaint.setStrokeWidth(strokeWidthDial); arcPaint.setShadowLayer(10, 0, 0, Color.parseColor("#FFFFFF")); arcPaint.setColor(Color.parseColor("#38F9FD")); canvas.drawArc(mRect, 150, (360 - openAngle), false, arcPaint);2. 绘制刻度和数字
canvas.rotate(150); for (int i = 0; i < clockPointNum + 1; i++) {
pointerPaint.setColor(colorDialMiddle); if (i % 10 == 0) { //长表针
pointerPaint.setStrokeWidth(3);
canvas.drawLine(radiusDial - DEFAULT_border - strokeWidthDial, 0, radiusDial - strokeWidthDial - dp2px(15), 0, pointerPaint);
drawPointerText(canvas, i);
} else if (i % 5 == 0f) { //短表针
pointerPaint.setStrokeWidth(2);
canvas.drawLine(radiusDial - DEFAULT_border - strokeWidthDial, 0, radiusDial - strokeWidthDial - dp2px(9), 0, pointerPaint);
}
canvas.rotate((360 - openAngle) / clockPointNum);
}
canvas.rotate(-((180 - openAngle) / 2 + ((360 - openAngle) / clockPointNum))); /**
* 绘制刻度数字
*/
private void drawPointerText(Canvas canvas, int i) {
canvas.save();
pointerPaint.setColor(getResources().getColor(R.color.white)); int currentCenterX = (int) (radiusDial - strokeWidthDial - dp2px(21) - pointerPaint.measureText(String.valueOf(i)) / 2);
canvas.translate(currentCenterX, 0);
canvas.rotate(360 - 150 - ((360 - openAngle) / clockPointNum) * i); //坐标系总旋转角度为360度
int textBaseLine = (int) (0 + (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom);
canvas.drawText(String.valueOf(i + clockMinValue), 0, textBaseLine, pointerPaint);
}3. 绘制指针阴影
int currentDegree = (int) ((currentValue - clockMinValue) * ((360 - openAngle) / clockPointNum) + 150);
canvas.rotate(currentDegree); int[] colorSweep = {0xAAFFE9EC, 0x0028E9EC, 0xAA28E9EC}; float[] position = {0f, 0.9f, 1f};
SweepGradient mShader = new SweepGradient(0, 0, colorSweep, position);
arcPaint.setShader(mShader);
arcPaint.setStyle(Paint.Style.STROKE);
arcPaint.setStrokeWidth((float) (radiusDial * 0.4));
arcPaint.clearShadowLayer();
RectF mRect = new RectF((float) (-mRealRadius - DEFAULT_border + radiusDial * 0.2), (float) (-mRealRadius -
DEFAULT_border + radiusDial * 0.2),
(float) (mRealRadius + DEFAULT_border - radiusDial * 0.2), (float) (mRealRadius + DEFAULT_border - radiusDial * 0.2));
canvas.drawArc(mRect, 360 - (currentDegree - 150), (currentDegree - 150), false, arcPaint);4. 绘制中间黑色圆形背景
canvas.restore();
canvas.translate(getPaddingLeft() + radiusDial, getPaddingTop() + radiusDial);
Paint pointerPaint = new Paint();
pointerPaint.setAntiAlias(true);
pointerPaint.setStyle(Paint.Style.FILL);
pointerPaint.setColor(Color.parseColor("#05002D"));
canvas.drawCircle(0, 0, (float) (radiusDial * 0.6), pointerPaint);5. 绘制表针
canvas.save(); int currentDegree = (int) ((currentValue - clockMinValue) * ((360 - openAngle) / clockPointNum) + 150); canvas.rotate(currentDegree); titlePaint.setColor(Color.WHITE); titlePaint.setAntiAlias(true); pointerPath.moveTo(radiusDial - dp2px(12), 0); pointerPath.lineTo(0, -dp2px(5)); pointerPath.lineTo(-12, 0); pointerPath.lineTo(0, dp2px(5)); pointerPath.close(); canvas.drawPath(pointerPath, titlePaint); canvas.save(); canvas.restore();
6. 绘制深蓝色发光圆形
canvas.rotate(0);
canvas.restore();
Paint pointerPaint = new Paint();
pointerPaint.setAntiAlias(true);
pointerPaint.setStyle(Paint.Style.FILL);
pointerPaint.setColor(Color.parseColor("#050D3D"));
pointerPaint.setShadowLayer(15, 0, 0, Color.parseColor("#006EC6"));
canvas.drawCircle(0, 0, (float) (radiusDial * 0.4), pointerPaint);7. 绘制表盘文字
titlePaint.setColor(Color.WHITE); titlePaint.setColor(titleDialColor); titlePaint.setTextSize(titleDialSize); canvas.drawText(formatData(currentValue), 0, 0, titlePaint); titlePaint.setColor(Color.parseColor("#38F9FD")); titlePaint.setTextSize(sp2px(14)); canvas.drawText("(" + dataUnit + ")", 0, dp2px(18), titlePaint);8. 添加底部控件
这部分代码就比较灵活了，仪表盘主体绘制出来以后，可以在布局文件中增加其它底部控件。并设置相应点击事件等。在此略过不表
感谢各位的阅读，以上就是“Android怎么自定义view实现科技感的仪表盘”的内容了，经过本文的学习后，相信大家对Android怎么自定义view实现科技感的仪表盘这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
