private RectF mWheelRect = new RectF();
private Paint mDefaultWheelPaint;
private Paint mFinishWheelPaint;
private Paint mCenterWheelPaint;
private Paint mTitlePaint, mStepPaint, mTargetPaint;
private float mCircleStrokeWidth;
private float mSweepAnglePer;
private float mPercent;
private int mStepNum, mCurrStepNum;
private float pressExtraStrokeWidth;
private BarAnimation mAnim;
private int mMaxStepNum;// 默认最大步数
private float mTitleY, mStepY, mTargetY;
private DecimalFormat mDecimalFormat = new DecimalFormat("#.0");// 格式为保留小数点后一位
public static String GOAL_STEP;
public static String PERCENT;
public CircleProgressBar(Context context) {
super(context);
init(null, 0);
}
public CircleProgressBar(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public CircleProgressBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
mFinishWheelPaint = new Paint();
mFinishWheelPaint.setColor(Color.rgb(100, 113, 205));
mFinishWheelPaint.setStyle(Paint.Style.STROKE);// 空心
mFinishWheelPaint.setStrokeCap(Paint.Cap.ROUND);// 圆角画笔
mFinishWheelPaint.setAntiAlias(true);// 去锯齿
mCenterWheelPaint = new Paint();
mCenterWheelPaint.setColor(Color.rgb(243, 243, 243));
mCenterWheelPaint.setStyle(Paint.Style.STROKE);
mCenterWheelPaint.setStrokeCap(Paint.Cap.ROUND);
mCenterWheelPaint.setAntiAlias(true);
mDefaultWheelPaint = new Paint();
mDefaultWheelPaint.setColor(Color.rgb(127, 127, 127));
mDefaultWheelPaint.setStyle(Paint.Style.STROKE);
mDefaultWheelPaint.setStrokeCap(Paint.Cap.ROUND);
mDefaultWheelPaint.setAntiAlias(true);
mTitlePaint = new Paint();
mTitlePaint.setAntiAlias(true);
mTitlePaint.setColor(Color.WHITE);
mStepPaint = new Paint();
mStepPaint.setAntiAlias(true);
mStepPaint.setColor(Color.WHITE);
mTargetPaint = new Paint();
mTargetPaint.setAntiAlias(true);
mTargetPaint.setColor(Color.WHITE);
mAnim = new BarAnimation();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawArc(mWheelRect, 0, 359, false, mDefaultWheelPaint);
canvas.drawArc(mWheelRect, 0, 359, false, mCenterWheelPaint);
canvas.drawArc(mWheelRect, 90, mSweepAnglePer, false, mFinishWheelPaint);
// canvas.drawText(“步数”, mWheelRect.centerX() - (mTitlePaint.measureText(“步数”) / 2), mTitleY,
// mTitlePaint);
canvas.drawText(mCurrStepNum + “”,
mWheelRect.centerX() - (mStepPaint.measureText(String.valueOf(mCurrStepNum)) / 2), mStepY,
mStepPaint);
String description = “”;
float percent = getPercent();
if(percent > 0.5){
description =“严重污染”;
}else if(percent<0.5){
description =“中等污染”;
}else{
description =“普通污染”;
}
canvas.drawText(description , mWheelRect.centerX() -
(mTargetPaint.measureText(description) / 2), mTargetY, mTargetPaint);
SweepGradient sweepGradient = new SweepGradient(mWheelRect.centerX(), mWheelRect.centerY(),
new int[]{getResources().getColor(R.color.color_environment_severe), getResources().getColor(R.color.color_environment_serious),
getResources().getColor(R.color.color_environment_excellent),
getResources().getColor(R.color.color_environment_good), getResources().getColor(R.color.color_environment_mild),
getResources().getColor(R.color.color_environment_moderate)}, null);
mFinishWheelPaint.setShader(sweepGradient);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
int min = Math.min(width, height);// 获取View最短边的长度
setMeasuredDimension(min, min);// 强制改View为以最短边为长度的正方形
mCircleStrokeWidth = getTextScale(15, min);// 圆弧的宽度
pressExtraStrokeWidth = getTextScale(10, min);// 圆弧离矩形的距离
mWheelRect.set(mCircleStrokeWidth + pressExtraStrokeWidth, mCircleStrokeWidth + pressExtraStrokeWidth,
min - mCircleStrokeWidth - pressExtraStrokeWidth, min - mCircleStrokeWidth - pressExtraStrokeWidth);// 设置矩形
mTitlePaint.setTextSize(getTextScale(60, min));
mStepPaint.setTextSize(getTextScale(120, min));
mTargetPaint.setTextSize(getTextScale(40, min));
mTitleY = getTextScale(170, min);
mStepY = getTextScale(300, min);
mTargetY = getTextScale(380, min);
mFinishWheelPaint.setStrokeWidth(mCircleStrokeWidth);
mCenterWheelPaint.setStrokeWidth(mCircleStrokeWidth);
mDefaultWheelPaint.setStrokeWidth(mCircleStrokeWidth - getTextScale(2, min));
mDefaultWheelPaint.setShadowLayer(getTextScale(10, min), 0, 0, Color.rgb(127, 127, 127));// 设置阴影
}
/**
-
进度条动画
-
@author Administrator
*/
public class BarAnimation extends Animation {
/**
-
每次系统调用这个方法时， 改变mSweepAnglePer，mPercent，stepnumbernow的值，
-
然后调用postInvalidate()不停的绘制view。
*/
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
// if (interpolatedTime < 1.0f) {
// mPercent = Float.parseFloat(mDecimalFormat.format(interpolatedTime * mStepNum * 100f / mMaxStepNum));// 将浮点值四舍五入保留一位小数
// mSweepAnglePer = interpolatedTime * mStepNum * 360 / mMaxStepNum;
// mCurrStepNum = (int) (interpolatedTime * mStepNum);
// } else {
mPercent = Float.parseFloat(mDecimalFormat.format(mStepNum * 100f / mMaxStepNum));// 将浮点值四舍五入保留一位小数
if (mPercent > 100.0f) {
mPercent = 100.0f;
最后
由于文章篇幅原因，我只把面试题列了出来，详细的答案，我整理成了一份PDF文档，这份文档还包括了还有 高级架构技术进阶脑图、Android开发面试专题资料，高级进阶架构资料 ，帮助大家学习提升进阶，也节省大家在网上搜索资料的时间来学习。
需要的朋友可以私信我【答案】或者点击这里免费领取
