Android的下拉刷新带进度条效果

package com.cayden.listview; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.View; /** * 带进度的进度条，线程安全的View，可直接在线程中更新进度 * @author cuiran * */ public class RoundProgressBar extends View { /** * 画笔对象的援用 */ private Paint paint; /** * 圆环的色彩 */ private int roundColor; /** * 圆环进度的色彩 */ private int roundProgressColor; /** * 中间进度百分比的字符串的色彩 */ private int textColor; /** * 中间进度百分比的字符串的字体 */ private float textSize; /** * 圆环的宽度 */ private float roundWidth; /** * 最大进度 */ private int max; /** * 当前进度 */ private int progress; /** * 是不是显示中间的进度 */ private boolean textIsDisplayable; /** * 进度的风格，实心或空心 */ private int style; public static final int STROKE = 0; public static final int FILL = 1; /**是不是循环**/ public boolean isSpinning = false; public RoundProgressBar(Context context) { this(context, null); } public RoundProgressBar(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); paint = new Paint(); TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar); //获得自定义属性和默许值 roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED); roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN); textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN); textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15); roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5); max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 360); textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true); style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0); mTypedArray.recycle();//必须Recycle } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /** * 画最外层的大圆环 */ int centre = getWidth()/2; //获得圆心的x坐标 int radius = (int) (centre - roundWidth/2); //圆环的半径 paint.setColor(roundColor); //设置圆环的色彩 paint.setStyle(Paint.Style.STROKE); //设置空心 paint.setStrokeWidth(roundWidth); //设置圆环的宽度 paint.setAntiAlias(true); //消除锯齿 canvas.drawCircle(centre, centre, radius, paint); //画出圆环 /** * 画进度百分比 现已去掉改成画图片 */ // paint.setStrokeWidth(0); // paint.setColor(textColor); // paint.setTextSize(textSize); // paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体 // int percent = (int)(((float)progress / (float)max) * 100); //中间的进度百分比，先转换成float在进行除法运算，不然都为0 // float textWidth = paint.measureText(percent + "%"); //丈量字体宽度，我们需要根据字体的宽度设置在圆环中间 // // if(textIsDisplayable && percent != 0 && style == STROKE){ // canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比 // } if(isSpinning){ /** * 画图片 */ Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.loading02); int width=bitmap.getWidth(); int height=bitmap.getHeight(); canvas.drawBitmap(bitmap, centre-width/2, centre-height/2 , paint); bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.loading06); width=bitmap.getWidth(); height=bitmap.getHeight(); canvas.drawBitmap(bitmap, centre-width/2, centre-height/2 , paint); /** * 画圆弧 ，画圆环的进度 */ //设置进度是实心还是空心 paint.setStrokeWidth(roundWidth); //设置圆环的宽度 paint.setColor(roundProgressColor); //设置进度的色彩 RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); //用于定义的圆弧的形状和大小的界限 paint.setStyle(Paint.Style.STROKE); canvas.drawArc(oval, progress⑼0, 320 , false, paint); //根据进度画圆弧 }else{ /** * 画图片 */ Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.loading02); int width=bitmap.getWidth(); int height=bitmap.getHeight(); canvas.drawBitmap(bitmap, centre-width/2, centre-height/2 , paint); bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.loading05); width=bitmap.getWidth(); height=bitmap.getHeight(); canvas.drawBitmap(bitmap, centre-width/2, centre-height/2 , paint); /** * 画圆弧 ，画圆环的进度 */ //设置进度是实心还是空心 paint.setStrokeWidth(roundWidth); //设置圆环的宽度 paint.setColor(roundProgressColor); //设置进度的色彩 RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); //用于定义的圆弧的形状和大小的界限 paint.setStyle(Paint.Style.STROKE); canvas.drawArc(oval, ⑼0, progress , false, paint); //根据进度画圆弧 } } public synchronized int getMax() { return max; } /** * 设置进度的最大值 * @param max */ public synchronized void setMax(int max) { if(max < 0){ throw new IllegalArgumentException("max not less than 0"); } this.max = max; } /** * 获得进度.需要同步 * @return */ public synchronized int getProgress() { return progress; } /** * Reset the count (in increment mode) */ public void resetCount() { progress = 0; invalidate(); } /** * Turn off spin mode */ public void stopSpinning() { isSpinning = false; progress = 0; spinHandler.removeMessages(0); } /** * Puts the view on spin mode */ public void spin() { isSpinning = true; spinHandler.sendEmptyMessage(0); } /** * Increment the progress by 1 (of 360) */ public void incrementProgress() { isSpinning = false; if (progress > 360) progress = 0; spinHandler.sendEmptyMessage(0); } private Handler spinHandler = new Handler() { /** * This is the code that will increment the progress variable * and so spin the wheel */ @Override public void handleMessage(Message msg) { invalidate(); if(isSpinning){ progress += 10; if (progress > 360) { progress = 0; } spinHandler.sendEmptyMessageDelayed(0, 0); } //super.handleMessage(msg); } }; /** * 设置进度，此为线程安全控件，由于斟酌多线的问题，需要同步 * 刷新界面调用postInvalidate()能在非UI线程刷新 * @param progress */ public synchronized void setProgress(int progress) { if(progress < 0){ throw new IllegalArgumentException("progress not less than 0"); } if(progress > max){ progress = max; } if(progress <= max){ this.progress = progress; postInvalidate(); } } public int getCricleColor() { return roundColor; } public void setCricleColor(int cricleColor) { this.roundColor = cricleColor; } public int getCricleProgressColor() { return roundProgressColor; } public void setCricleProgressColor(int cricleProgressColor) { this.roundProgressColor = cricleProgressColor; } public int getTextColor() { return textColor; } public void setTextColor(int textColor) { this.textColor = textColor; } public float getTextSize() { return textSize; } public void setTextSize(float textSize) { this.textSize = textSize; } public float getRoundWidth() { return roundWidth; } public void setRoundWidth(float roundWidth) { this.roundWidth = roundWidth; } }