代码
attrs.xml
<declare-styleable name="RingProgressBarView">
<attr name="circle_radius" format="dimension"/>
<attr name="stroke_width" format="dimension"/>
<attr name="circle_color" format="color"/>
<attr name="ring_background_color" format="color"/>
<attr name="ring_cor" forLineProgressBarViewmat="color"/>
<attr name="font_color" format="color"/>
<attr name="font_size" format="dimension"/>
</declare-styleable>
RingProgressBarView.java
public class RingProgressBarView extends View {
// 画实心圆的画笔
private Paint mCirclePaint;
// 画圆环的画笔
private Paint mRingPaint;
// 画圆环的画笔背景色
private Paint mRingPaintBg;
// 画字体的画笔
private Paint mTextPaint;
// 圆形颜色
private int mCircleColor;
// 圆环颜色
private int mRingColor;
// 圆环背景颜色
private int mRingBgColor;
// 字体颜色
private int mTextColor;
// 字体大小
private float mTextSize;
// 半径
private float mRadius;
// 圆环半径
private float mRingRadius;
// 圆环宽度
private float mStrokeWidth;
// 圆心x坐标
private int mXCenter;
// 圆心y坐标
private int mYCenter;
// 字的长度
private float mTxtWidth;
// 字的高度
private float mTxtHeight;
// 总进度
private int mTotalProgress = 100;
// 当前进度
private float mProgress;
private String mProgressTxt;
public RingProgressBarView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
initAttrs(context, attrs);
initVariable();
}
private void initAttrs(Context context,AttributeSet attrs) {
TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.RingProgressBarView, 0, 0);
mRadius = typeArray.getDimension(R.styleable.RingProgressBarView_circle_radius, dp2px(30));
mStrokeWidth = typeArray.getDimension(R.styleable.RingProgressBarView_stroke_width,dp2px(6));
mCircleColor = typeArray.getColor(R.styleable.RingProgressBarView_circle_color, Color.parseColor("#ffffff"));
mRingColor = typeArray.getColor(R.styleable.RingProgressBarView_ring_cor, Color.parseColor("#FF6059"));
mRingBgColor = typeArray.getColor(R.styleable.RingProgressBarView_ring_background_color,Color.parseColor("#E3E2E2"));
mTextColor = typeArray.getColor(R.styleable.RingProgressBarView_font_color,Color.parseColor("#2E3D45"));
mTextSize = typeArray.getDimension(R.styleable.RingProgressBarView_font_size,mRadius / 3);
mRingRadius = mRadius + mStrokeWidth / 2;
}
private void initVariable() {
//内圆
mCirclePaint = getPaint(Paint.Style.FILL,mCircleColor);
//外圆弧背景
mRingPaintBg = getPaint(Paint.Style.STROKE,mRingBgColor,mStrokeWidth);
//外圆弧
mRingPaint = getPaint(Paint.Style.STROKE,mRingColor,mStrokeWidth);
mRingPaint.setStrokeCap(Paint.Cap.ROUND);//设置线冒样式，有圆 有方
//中间字
mTextPaint = getPaint(Paint.Style.FILL,mTextColor);
mTextPaint.setTextSize(mTextSize);
Paint.FontMetrics fm = mTextPaint.getFontMetrics();
mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
}
private Paint getPaint(Paint.Style style,int color){
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); //抗锯齿标志
paint.setStyle(style);
paint.setColor(color);
paint.setAntiAlias(true);
return paint;
}
private Paint getPaint(Paint.Style style,int color,float width){
Paint paint = getPaint(style,color);
paint.setStrokeWidth(width);
return paint;
}
@Override
protected void onDraw(Canvas canvas) {
// super.onDraw(canvas);
mXCenter = getWidth() / 2;
mYCenter = getHeight() / 2;
//内圆
canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);
//外圆弧背景
RectF oval1 = new RectF();
oval1.left = (mXCenter - mRingRadius);
oval1.top = (mYCenter - mRingRadius);
oval1.right = mRingRadius * 2 + (mXCenter - mRingRadius);
oval1.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
canvas.drawArc(oval1, 0, 360, false, mRingPaintBg); //圆弧所在的椭圆对象、圆弧的起始角度、圆弧的角度、是否显示半径连线
//外圆弧
if (mProgress > 0 ) {
RectF oval = new RectF();
oval.left = (mXCenter - mRingRadius);
oval.top = (mYCenter - mRingRadius);
oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);
oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
canvas.drawArc(oval, -90, -(((float)mProgress / mTotalProgress) * 360), false, mRingPaint); //
//字体
String txt = mProgressTxt + "%";
mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);
}
}
//设置进度
public void setProgress(float progress) {
final ValueAnimator anim = ValueAnimator.ofFloat(0,progress);
anim.setDuration(3000);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
mProgress = (float)animator.getAnimatedValue();
DecimalFormat df2 = new DecimalFormat("###.00");
mProgressTxt= df2.format(mProgress);
invalidate();
}
});
anim.start();
}
protected int dp2px(int dpVal) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,getResources().getDisplayMetrics());
}
}
activity_ring_progress_bar.xml
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.demo.android_view.mview.RingProgressBarView
android:id="@+id/rpbv"
android:layout_width="120dp"
android:layout_height="120dp"/>
</android.support.constraint.ConstraintLayout>
RingProgressBarActivity.java
public class RingProgressBarActivity extends AppCompatActivity {
private RingProgressBarView rpbv;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ring_progress_bar);
rpbv = findViewById(R.id.rpbv);
rpbv.setProgress(100f);
}
}
源代码
LINKS
Android 自定义漂亮的圆形进度条
Android自定义View之画圆环(进阶篇:圆形进度条)
Android 自定义View实例之进度圆环
Android花样loading进度条（二）-简单环形进度条
Android自定义圆形进度条
android自定义控件之圆形进度条（带动画）