Android中实现圆形进度条的方法

本篇文章为大家展示了Android中实现圆形进度条的方法，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

主要思路是写一个继承ProgressBar的自定义View

代码：

package com.fun.progressbarwithnumber;import android.content.Context;import android.content.res.TypedArray;import android.graphics.canvas;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.widget.ProgressBar;public class HorizontalProgressBarWithNumber extends ProgressBar {  private static final int DEFAULT_TEXT_SIZE = 10;  private static final int DEFAULT_TEXT_COLOR = 0XFFFC00D1;  private static final int DEFAULT_COLOR_UNREACHED_COLOR = 0xFFd3D6da;  private static final int DEFAULT_HEIGHT_REACHED_PROGRESS_BAR = 2;  private static final int DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR = 2;  private static final int DEFAULT_CIRCLE_COLOR = 0XFF3F51B5;  protected Paint mPaint = new Paint();  // 字体颜色  protected int mTextColor = DEFAULT_TEXT_COLOR;  // 字体大小  protected int mTextSize = sp2px(DEFAULT_TEXT_SIZE);  // 覆盖进度高度  protected int mReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_REACHED_PROGRESS_BAR);  // 覆盖进度颜色  protected int mReachedBarColor = DEFAULT_TEXT_COLOR;  // 未覆盖进度高度  protected int mUnReachedProgressBarHeight = dp2px(DEFAULT_HEIGHT_UNREACHED_PROGRESS_BAR);  // 未覆盖进度颜色  protected int mUnReachedBarColor = DEFAULT_COLOR_UNREACHED_COLOR;  // 圆的颜色  protected int mCircleColor = DEFAULT_CIRCLE_COLOR;  protected int mRealWidth;  protected boolean mIfDrawText = true;  protected boolean mIfDrawCircle = true;  protected static final int VISIBLE = 0;  public HorizontalProgressBarWithNumber(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public HorizontalProgressBarWithNumber(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    obtainStyledAttributes(attrs);    mPaint.setTextSize(mTextSize);    mPaint.setColor(mTextColor);    mPaint.setAntiAlias(true);  }  private void obtainStyledAttributes(AttributeSet attrs) {    // 获取自定义属性    final TypedArray attributes = getContext().obtainStyledAttributes(attrs, R.styleable.HorizontalProgressBarWithNumber);    mTextColor = attributes.getColor(R.styleable.HorizontalProgressBarWithNumber_progress_text_color, DEFAULT_TEXT_COLOR);    mTextSize = (int) attributes.getDimension(R.styleable.HorizontalProgressBarWithNumber_progress_text_size, mTextSize);    mCircleColor = attributes.getColor(R.styleable.HorizontalProgressBarWithNumber_progress_circle_color, DEFAULT_CIRCLE_COLOR);    mReachedBarColor = attributes.getColor(R.styleable.HorizontalProgressBarWithNumber_progress_reached_color, mTextColor);    mUnReachedBarColor = attributes.getColor(R.styleable.HorizontalProgressBarWithNumber_progress_unreached_color, DEFAULT_COLOR_UNREACHED_COLOR);    mReachedProgressBarHeight = (int) attributes.getDimension(R.styleable.HorizontalProgressBarWithNumber_progress_reached_bar_height, mReachedProgressBarHeight);    mUnReachedProgressBarHeight = (int) attributes.getDimension(R.styleable.HorizontalProgressBarWithNumber_progress_unreached_bar_height, mUnReachedProgressBarHeight);    int textVisible = attributes.getInt(R.styleable.HorizontalProgressBarWithNumber_progress_text_visibility, VISIBLE);    if (textVisible != VISIBLE) {      mIfDrawText = false;    }    attributes.recycle();    int left = (int) (mReachedProgressBarHeight * 0.8), right = (int) (mReachedProgressBarHeight * 0.8);    int top = (int) (mReachedProgressBarHeight * 0.3 + dp2px(1)), bottom = (int) (mReachedProgressBarHeight * 0.3 + dp2px(1));    setPadding(left, top, right, bottom);  }  @Override  protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    int width = MeasureSpec.getSize(widthMeasureSpec);    int height = measureHeight(heightMeasureSpec);    setMeasuredDimension(width, height);    mRealWidth = getMeasuredWidth() - getPaddingRight() - getPaddingLeft();  }  private int measureHeight(int measureSpec) {    int result;    int specMode = MeasureSpec.getMode(measureSpec);    int specSize = MeasureSpec.getSize(measureSpec);    if (specMode == MeasureSpec.EXACTLY) {      result = specSize;    } else {      float textHeight = (mPaint.descent() - mPaint.ascent());      result = (int) (getPaddingTop() + getPaddingBottom() + Math.max(          Math.max(mReachedProgressBarHeight, mUnReachedProgressBarHeight), Math.abs(textHeight)));      if (specMode == MeasureSpec.AT_MOST) {        result = Math.min(result, specSize);      }    }    return result;  }  @Override  protected synchronized void onDraw(Canvas canvas) {    canvas.save();    canvas.translate(getPaddingLeft(), getHeight() / 2);    boolean noNeedBg = false;    float radio = getProgress() * 1.0f / getMax();    float progressPosX = (int) (mRealWidth * radio);    String text = getProgress() + "%";    float textWidth = mPaint.measureText(text);    float textHeight = (mPaint.descent() + mPaint.ascent()) / 2;    float radius = (mReachedProgressBarHeight + getPaddingBottom() + getPaddingTop()) / 2;    // 覆盖的进度    float endX = progressPosX;    if (endX > -1) {      mPaint.setColor(mReachedBarColor);      RectF rectF = new RectF(0, 0 - getPaddingTop() - getPaddingBottom(),          endX, mReachedProgressBarHeight - getPaddingBottom());      canvas.drawRoundRect(rectF, 25, 25, mPaint);    }    // 未覆盖的进度    if (!noNeedBg) {      float start = progressPosX;      mPaint.setColor(mUnReachedBarColor);      RectF rectF = new RectF(start, 0 - getPaddingTop() - getPaddingBottom(),          mRealWidth + getPaddingRight() - radius, mReachedProgressBarHeight - getPaddingBottom());      canvas.drawRoundRect(rectF, 25, 25, mPaint);    }    // 圆    if (mIfDrawCircle) {      mPaint.setColor(mCircleColor);      canvas.drawCircle(progressPosX, 0, radius, mPaint);    }    // 文本    if (mIfDrawText) {      mPaint.setColor(mTextColor);      canvas.drawText(text, progressPosX - textWidth / 2, -textHeight, mPaint);    }    canvas.restore();  }    protected int dp2px(int dpVal) {    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics());  }    protected int sp2px(int spVal) {    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, getResources().getDisplayMetrics());  }}