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不懂Android自定义View如何实现加载进度条效果??其实想解决这个问题也不难,下面让小编带着大家一起学习怎么去解决,希望大家阅读完这篇文章后大所收获。
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效果图:
下面就以水平的进度条为列进行讲解:
1.首先还是在attrs.xml文件中自定义我们需要的属性:
<?xml version="1.0" encoding="utf-8"?>
2.获取我们的自定义属性:
/** * 字体大小 */ private int mTextSize; /** * 字体颜色 */ private int mTextColor; /** * 渐变开始的颜色 */ private int mStartColor; /** * 渐变结束的颜色 */ private int mEndColor; /** * 进度条的宽 */ private int mProgressWidth; /** * 进度条的圆角大小 */ private int mRadius; /** * 默认进度条的颜色 */ private int mBgColor; /** * 进度条的当前进度 */ private float mCurrentProgress; /** * 加载的速度 */ private int mLoadSpeed; private String mContent="0%"; private Rect mBounds; private Paint mPaint; public GradientProgressBar(Context context) { this(context, null); } public GradientProgressBar(Context context, AttributeSet attrs) { this(context, attrs, 0); } public GradientProgressBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.GradientProgressBar, defStyleAttr, 0); int count = array.getIndexCount(); for (int i = 0; i < count; i++) { int index = array.getIndex(i); switch (index) { case R.styleable.GradientProgressBar_textSize: /** * 默认设置为16sp,TypeValue也可以把sp转化为px */ mTextSize = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); break; case R.styleable.GradientProgressBar_textColor: /** * 默认设置为黑色 */ mTextColor = array.getColor(index, Color.BLACK); break; case R.styleable.GradientProgressBar_startColor: mStartColor = array.getColor(index, Color.BLACK); break; case R.styleable.GradientProgressBar_endColor: mEndColor = array.getColor(index, Color.BLACK); break; case R.styleable.GradientProgressBar_bgColor: mBgColor = array.getColor(index, Color.BLACK); break; case R.styleable.GradientProgressBar_rectRadius: mRadius = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics() )); break; case R.styleable.GradientProgressBar_lineWidth: mProgressWidth=array.getDimensionPixelSize(index,(int)TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP,200,getResources().getDisplayMetrics())); break; case R.styleable.GradientProgressBar_loadSpeed: mLoadSpeed=array.getInt(index,10); break; } } array.recycle(); init(); }
init()方法做如下操作
private void init(){ mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setAntiAlias(true); mBounds = new Rect(); new Thread(new Runnable() { @Override public void run() { while (mCurrentProgress < mProgressWidth) { mCurrentProgress = mCurrentProgress + 1; mContent = Math.round((mCurrentProgress / mProgressWidth) * 100) + "%"; try { postInvalidate(); Thread.sleep(mLoadSpeed); } catch (Exception e) { e.printStackTrace(); } } } }).start(); }
3.重写OnDraw()方法
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 设置画笔的属性 */ mPaint.setColor(mBgColor); mPaint.setStyle(Paint.Style.FILL); /** * 绘制背景圆角矩形 */ canvas.drawRoundRect(0, 0, mProgressWidth, getHeight(), mRadius, mRadius, mPaint); /** * 设置线性渐变,设置渐变开始的起点坐标和终点坐标,渐变开始和结束的颜色,设置镜像 * 对于这个方法不太明白的可以google一下,这里不再详细说明 */ LinearGradient gradient = new LinearGradient(0, getHeight() / 2, mProgressWidth, getHeight() / 2, mStartColor, mEndColor, Shader.TileMode.MIRROR); mPaint.setShader(gradient); /** * 根据进度绘制圆角矩形 */ canvas.drawRoundRect(0, 0, mCurrentProgress, getHeight(), mRadius, mRadius, mPaint); mPaint.reset(); mPaint.setAntiAlias(true); mPaint.setColor(mTextColor); mPaint.setTextSize(mTextSize); /** * 获取绘制文本所需的矩形大小 */ mPaint.getTextBounds(mContent, 0, mContent.length(), mBounds); canvas.drawText(mContent, getWidth() / 2 - mBounds.width() / 2, getHeight() / 2 + mBounds.height() / 2, mPaint); }
好了,这样就完成了我们水平渐变加载进度条,下面贴出圆形进度条的源码:
public class RoundProgressBar extends View { /** * 自定义变量 */ private int mTextSize; private int mTextColor; private int mCircleWidth; private int mBgColor; private int mCurrentColor; private int mLoadSpeed; private float mCurrentProgress; private String mContent = "0%"; private Rect mBounds; private Paint mPaint; public RoundProgressBar(Context context) { this(context, null); } public RoundProgressBar(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RoundProgressBar(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.RoundProgressBar, defStyleAttr, 0); int count = array.getIndexCount(); for (int i = 0; i < count; i++) { int index = array.getIndex(i); switch (index) { case R.styleable.RoundProgressBar_textSizeRound: /** * 默认设置为16sp,TypeValue也可以把sp转化为px */ mTextSize = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); break; case R.styleable.RoundProgressBar_textColorRound: /** * 默认设置为黑色 */ mTextColor = array.getColor(index, Color.BLACK); break; case R.styleable.RoundProgressBar_bgColorRound: mBgColor = array.getColor(index, Color.BLACK); break; case R.styleable.RoundProgressBar_circleWidthRound: mCircleWidth = array.getDimensionPixelSize(index, (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, 1, getResources().getDisplayMetrics() )); break; case R.styleable.RoundProgressBar_currentColorRound: mCurrentColor = array.getColor(index, Color.BLACK); break; case R.styleable.RoundProgressBar_loadSpeedRound: mLoadSpeed=array.getInt(index,10); break; } } array.recycle(); init(); } private void init() { mBounds = new Rect(); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setAntiAlias(true); new Thread(new Runnable() { @Override public void run() { while (mCurrentProgress < 360) { mCurrentProgress = mCurrentProgress + 1; mContent = Math.round((mCurrentProgress / 360) * 100) + "%"; postInvalidate(); try { Thread.sleep(mLoadSpeed); } catch (Exception e) { e.printStackTrace(); } } } }).start(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 设置画笔的属性 */ mPaint.setColor(mBgColor); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(mCircleWidth); /** * 绘制圆环背景 */ int xPoint = getWidth() / 2;//获取圆心x的坐标 int radius = xPoint - mCircleWidth;//获取圆心的半径 canvas.drawCircle(xPoint, xPoint, radius, mPaint);//用于定义的圆弧的形状和大小的界限 /** * 绘制圆环 */ mPaint.setColor(mCurrentColor); RectF oval = new RectF(xPoint - radius, xPoint - radius, radius + xPoint, radius + xPoint); canvas.drawArc(oval, -90, mCurrentProgress, false, mPaint); /** * 绘制当前进度文本 */ mPaint.reset(); mPaint.setAntiAlias(true); mPaint.setColor(mTextColor); mPaint.setTextSize(mTextSize); mPaint.getTextBounds(mContent, 0, mContent.length(), mBounds); canvas.drawText(mContent, xPoint - mBounds.width() / 2, xPoint + mBounds.height() / 2, mPaint); } }
4.在xml文件中申明我们的自定义View
<?xml version="1.0" encoding="utf-8"?>
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