android ProgressBar自定义半圆形进度条

不多说，直接上代码，可直接看注释，类似于一个仪盘表，下面的类可当做是一个工具类，有什么要修改的地方，可直接在此类中添加

public class ColorArcProgressBar extends View{

private int mWidth;
private int mHeight;
private int diameter = 500; //直径
private float centerX; //圆心X坐标
private float centerY; //圆心Y坐标

private Paint allArcPaint;
private Paint progressPaint;
private Paint vTextPaint;
private Paint hintPaint;
private Paint degreePaint;
private Paint curSpeedPaint;

private RectF bgRect;

private ValueAnimator progressAnimator;
private PaintFlagsDrawFilter mDrawFilter;
private SweepGradient sweepGradient;
private Matrix rotateMatrix;

private float startAngle = 135;
private float sweepAngle = 270;
private float currentAngle = 0;
private float lastAngle;
private int[] colors = new int[]{Color.GREEN, Color.YELLOW, Color.RED, Color.RED};
private float maxValues = 60;
private float curValues = 0;
private float bgArcWidth = dipToPx(2);
private float progressWidth = dipToPx(10);
private float textSize = dipToPx(60);
private float hintSize = dipToPx(15);
private float curSpeedSize = dipToPx(25);
private int aniSpeed = 1000;
private float longdegree = dipToPx(13);
private float shortdegree = dipToPx(5);
private final int DEGREE_PROGRESS_DISTANCE = dipToPx(8);

private String hintColor = "#575757";
private String contentColor = "#3CCDB1";
private String longDegreeColor = "#111111";
private String shortDegreeColor = "#111111";
private String bgArcColor = "#D6F7EB"; //圆圈背景色（画笔颜色）
private String titleString;
private String hintString;

private boolean isShowCurrentSpeed = true;
private boolean isNeedTitle;
private boolean isNeedUnit;
private boolean isNeedDial;
private boolean isNeedContent;

// sweepAngle / maxValues 的值
private float k;

public ColorArcProgressBar(Context context) {
super(context, null);
initView();
}

public ColorArcProgressBar(Context context, AttributeSet attrs) {
super(context, attrs, 0);
initCofig(context, attrs);
initView();
}

public ColorArcProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initCofig(context, attrs);
initView();
}

/**
* 初始化布局配置
* @param context
* @param attrs
*/
private void initCofig(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ColorArcProgressBar);
int color1 = a.getColor(R.styleable.ColorArcProgressBar_front_color1, Color.GREEN);
int color2 = a.getColor(R.styleable.ColorArcProgressBar_front_color2, color1);
int color3 = a.getColor(R.styleable.ColorArcProgressBar_front_color3, color1);
colors = new int[]{color1, color2, color3, color3};

sweepAngle = a.getInteger(R.styleable.ColorArcProgressBar_total_engle, 270);
bgArcWidth = a.getDimension(R.styleable.ColorArcProgressBar_back_width, dipToPx(2));
progressWidth = a.getDimension(R.styleable.ColorArcProgressBar_front_width, dipToPx(10));
isNeedTitle = a.getBoolean(R.styleable.ColorArcProgressBar_is_need_title, false);
isNeedContent = a.getBoolean(R.styleable.ColorArcProgressBar_is_need_content, false);
isNeedUnit = a.getBoolean(R.styleable.ColorArcProgressBar_is_need_unit, false);
isNeedDial = a.getBoolean(R.styleable.ColorArcProgressBar_is_need_dial, false);
hintString = a.getString(R.styleable.ColorArcProgressBar_string_unit);
titleString = a.getString(R.styleable.ColorArcProgressBar_string_title);
curValues = a.getFloat(R.styleable.ColorArcProgressBar_current_value, 0);
maxValues = a.getFloat(R.styleable.ColorArcProgressBar_max_value, 60);
setCurrentValues(curValues);
setMaxValues(maxValues);
a.recycle();

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = (int) (2 * longdegree + progressWidth + diameter + 2 * DEGREE_PROGRESS_DISTANCE);
int height= (int) (2 * longdegree + progressWidth + diameter + 2 * DEGREE_PROGRESS_DISTANCE);
setMeasuredDimension(width, height);
}

private void initView() {

diameter = 3 * getScreenWidth() / 5;
//弧形的矩阵区域
bgRect = new RectF();
bgRect.top = longdegree + progressWidth/2 + DEGREE_PROGRESS_DISTANCE;
bgRect.left = longdegree + progressWidth/2 + DEGREE_PROGRESS_DISTANCE;
bgRect.right = diameter + (longdegree + progressWidth/2 + DEGREE_PROGRESS_DISTANCE);
bgRect.bottom = diameter + (longdegree + progressWidth/2 + DEGREE_PROGRESS_DISTANCE);

//圆心
centerX = (2 * longdegree + progressWidth + diameter + 2 * DEGREE_PROGRESS_DISTANCE)/2;
centerY = (2 * longdegree + progressWidth + diameter + 2 * DEGREE_PROGRESS_DISTANCE)/2;

//外部刻度线
degreePaint = new Paint();
degreePaint.setColor(Color.parseColor(longDegreeColor));

//整个弧形
allArcPaint = new Paint();
allArcPaint.setAntiAlias(true);
allArcPaint.setStyle(Paint.Style.STROKE);
allArcPaint.setStrokeWidth(bgArcWidth);
allArcPaint.setColor(Color.parseColor(bgArcColor));
allArcPaint.setStrokeCap(Paint.Cap.ROUND);

//当前进度的弧形
progressPaint = new Paint();
progressPaint.setAntiAlias(true);
progressPaint.setStyle(Paint.Style.STROKE);
progressPaint.setStrokeCap(Paint.Cap.ROUND);
progressPaint.setStrokeWidth(progressWidth);
progressPaint.setColor(Color.GREEN);

//内容显示文字
vTextPaint = new Paint();
vTextPaint.setTextSize(textSize);
vTextPaint.setColor(Color.parseColor(contentColor));
vTextPaint.setTextAlign(Paint.Align.CENTER);

//显示单位文字
hintPaint = new Paint();
hintPaint.setTextSize(hintSize);
hintPaint.setColor(Color.parseColor(hintColor));
hintPaint.setTextAlign(Paint.Align.CENTER);

//显示标题文字
curSpeedPaint = new Paint();
curSpeedPaint.setTextSize(curSpeedSize);
curSpeedPaint.setColor(Color.parseColor(hintColor));
curSpeedPaint.setTextAlign(Paint.Align.CENTER);

mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
sweepGradient = new SweepGradient(centerX, centerY, colors, null);
rotateMatrix = new Matrix();

}

@Override
protected void onDraw(Canvas canvas) {
//抗锯齿
canvas.setDrawFilter(mDrawFilter);

if (isNeedDial) {
//画刻度线
for (int i = 0; i < 40; i++) {
if (i > 15 && i < 25) {
canvas.rotate(9, centerX, centerY);
continue;
}
if (i % 5 == 0) {
degreePaint.setStrokeWidth(dipToPx(2));
degreePaint.setColor(Color.parseColor(longDegreeColor));
canvas.drawLine(centerX, centerY - diameter / 2 - progressWidth / 2 - DEGREE_PROGRESS_DISTANCE,
centerX, centerY - diameter / 2 - progressWidth / 2 - DEGREE_PROGRESS_DISTANCE - longdegree, degreePaint);
} else {
degreePaint.setStrokeWidth(dipToPx(1.4f));
degreePaint.setColor(Color.parseColor(shortDegreeColor));
canvas.drawLine(centerX, centerY - diameter / 2 - progressWidth / 2 - DEGREE_PROGRESS_DISTANCE - (longdegree - shortdegree) / 2,
centerX, centerY - diameter / 2 - progressWidth / 2 - DEGREE_PROGRESS_DISTANCE - (longdegree - shortdegree) / 2 - shortdegree, degreePaint);
}

canvas.rotate(9, centerX, centerY);
}
}

//整个弧
canvas.drawArc(bgRect, startAngle, sweepAngle, false, allArcPaint);

//设置渐变色
rotateMatrix.setRotate(130, centerX, centerY);
sweepGradient.setLocalMatrix(rotateMatrix);
progressPaint.setShader(sweepGradient);

//当前进度
canvas.drawArc(bgRect, startAngle, currentAngle, false, progressPaint);

if (isNeedContent) {
canvas.drawText(String.format("%.0f", curValues), centerX, centerY + textSize / 3, vTextPaint);
}
if (isNeedUnit) {
canvas.drawText(hintString, centerX, centerY + 2 * textSize / 3, hintPaint);
}
if (isNeedTitle) {
canvas.drawText(titleString, centerX, centerY - 2 * textSize / 3, curSpeedPaint);
}

invalidate();

}

/**
* 设置最大值
* @param maxValues
*/
public void setMaxValues(float maxValues) {
this.maxValues = maxValues;
k = sweepAngle/maxValues;
}

/**
* 设置当前值
* @param currentValues
*/
public void setCurrentValues(float currentValues) {
if (currentValues > maxValues) {
currentValues = maxValues;
}
if (currentValues < 0) {
currentValues = 0;
}
this.curValues = currentValues;
lastAngle = currentAngle;
setAnimation(lastAngle, currentValues * k, aniSpeed);
}

/**
* 设置整个圆弧宽度
* @param bgArcWidth
*/
public void setBgArcWidth(int bgArcWidth) {
this.bgArcWidth = bgArcWidth;
}

/**
* 设置进度宽度
* @param progressWidth
*/
public void setProgressWidth(int progressWidth) {
this.progressWidth = progressWidth;
}

/**
* 设置速度文字大小
* @param textSize
*/
public void setTextSize(int textSize) {
this.textSize = textSize;
}

/**
* 设置单位文字大小
* @param hintSize
*/
public void setHintSize(int hintSize) {
this.hintSize = hintSize;
}

/**
* 设置单位文字
* @param hintString
*/
public void setUnit(String hintString) {
this.hintString = hintString;
invalidate();
}

/**
* 设置直径大小
* @param diameter
*/
public void setDiameter(int diameter) {
this.diameter = dipToPx(diameter);
}

/**
* 设置标题
* @param title
*/
private void setTitle(String title){
this.titleString = title;
}

/**
* 设置是否显示标题
* @param isNeedTitle
*/
private void setIsNeedTitle(boolean isNeedTitle) {
this.isNeedTitle = isNeedTitle;
}

/**
* 设置是否显示单位文字
* @param isNeedUnit
*/
private void setIsNeedUnit(boolean isNeedUnit) {
this.isNeedUnit = isNeedUnit;
}

/**
* 设置是否显示外部刻度盘
* @param isNeedDial
*/
private void setIsNeedDial(boolean isNeedDial) {
this.isNeedDial = isNeedDial;
}

/**
* 为进度设置动画
* @param last
* @param current
*/
private void setAnimation(float last, float current, int length) {
progressAnimator = ValueAnimator.ofFloat(last, current);
progressAnimator.setDuration(length);
progressAnimator.setTarget(currentAngle);
progressAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override
public void onAnimationUpdate(ValueAnimator animation) {
currentAngle= (Float) animation.getAnimatedValue();
curValues = currentAngle/k;
}
});
progressAnimator.start();
}

/**
* dip 转换成px
* @param dip
* @return
*/
private int dipToPx(float dip) {
float density = getContext().getResources().getDisplayMetrics().density;
return (int)(dip * density + 0.5f * (dip >= 0 ? 1 : -1));
}

/**
* 得到屏幕宽度
* @return
*/
private int getScreenWidth() {
WindowManager windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics displayMetrics = new DisplayMetrics();
windowManager.getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics.widthPixels;
}
}

以下为xml中布局

<com.android.cft.jinju.utils.ColorArcProgressBar
android:id="@+id/health_bar"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerInParent="true"
app:back_color="@android:color/darker_gray"
app:back_width="10dp"
app:front_color1="#4BD866"
app:front_color2="#46D480"
app:front_color3="@color/title_green"
app:front_width="13dp"
app:is_need_content="true"
app:is_need_unit="true"
app:max_value="100"
app:string_unit=""
app:is_need_title="true"
app:string_title="今日步数"
app:total_engle="270" />

以下为在activity或fragment中调用此自定义半圆

定义：private ColorArcProgressBar arcProgressBar;

赋值：arcProgressBar = (ColorArcProgressBar) view.findViewById(R.id.health_bar);

设置最大值：arcProgressBar.setMaxValues(100);

设值：arcProgressBar.setMaxValues(1000);