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();
}
/**
* dp 2 px
*/
protected int dp2px(int dpVal) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal, getResources().getDisplayMetrics());
}
/**
* sp 2 px
*/
protected int sp2px(int spVal) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal, getResources().getDisplayMetrics());
}
}使用
在布局文件中加入：
<com.fun.progressbarwithnumber.HorizontalProgressBarWithNumber
android:id="@+id/hpbwn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
fun:progress_circle_color="#ff000000"
fun:progress_reached_bar_height="20dp"
fun:progress_reached_color="#FFFF4081"
fun:progress_text_color="#ffffffff"
fun:progress_text_size="14sp"
fun:progress_unreached_bar_height="20dp"
fun:progress_unreached_color="#ffBCB4E8" />注意：
当前进度和剩余进度的高度要一致，圆圈大小和圆圈内文字的大小要配合Java代码调整。
上述内容就是Android中实现圆形进度条的方法，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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