Android 自定义各种进度条,Android实现自定义进度条-优快云博客

这是一个关于Android自定义视图的实现，创建了一个圆形进度条TasksCompletedView。它使用了Paint对象来绘制实心圆、圆环以及进度百分比，并通过获取自定义属性设置颜色、半径和宽度。在onDraw方法中，计算并绘制了当前进度的圆环和百分比文本。

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package com.snailws.taskscompleted.activity;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.RectF;

import android.graphics.Paint.FontMetrics;

import android.util.AttributeSet;

import android.view.View;

import com.snailws.taskscompleted.R;

/**

* @version 1.0

public class TasksCompletedView extends View {

// 画实心圆的画笔

private Paint mCirclePaint;

// 画圆环的画笔

private Paint mRingPaint;

// 画字体的画笔

private Paint mTextPaint;

// 圆形颜色

private int mCircleColor;

// 圆环颜色

private int mRingColor;

// 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 int mProgress;

public TasksCompletedView(Context context, AttributeSet attrs) {

super(context, attrs);

// 获取自定义的属性

initAttrs(context, attrs);

initVariable();

}

private void initAttrs(Context context, AttributeSet attrs) {

TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,

R.styleable.TasksCompletedView, 0, 0);

mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80);

mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10);

mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF);

mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF);

mRingRadius = mRadius + mStrokeWidth / 2;

}

private void initVariable() {

mCirclePaint = new Paint();

mCirclePaint.setAntiAlias(true);

mCirclePaint.setColor(mCircleColor);

mCirclePaint.setStyle(Paint.Style.FILL);

mRingPaint = new Paint();

mRingPaint.setAntiAlias(true);

mRingPaint.setColor(mRingColor);

mRingPaint.setStyle(Paint.Style.STROKE);

mRingPaint.setStrokeWidth(mStrokeWidth);

mTextPaint = new Paint();

mTextPaint.setAntiAlias(true);

mTextPaint.setStyle(Paint.Style.FILL);

mTextPaint.setARGB(255, 255, 255, 255);

mTextPaint.setTextSize(mRadius / 2);

FontMetrics fm = mTextPaint.getFontMetrics();

mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);

}

@Override

protected void onDraw(Canvas canvas) {

mXCenter = getWidth() / 2;

mYCenter = getHeight() / 2;

canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);

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); //

//canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint);

String txt = mProgress + "%";

mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());

canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);

}

public void setProgress(int progress) {

mProgress = progress;

//invalidate();

postInvalidate();

}

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