android自定义view实现数字进度条

package com.tuya;import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;/** * Created by admin on 2016/12/19. */public class DownLoadProgressView extends View { private Paint paint;//绘制进度条画笔 private Paint textPaint;//绘制文字画笔 private Paint dottePaint;//绘制灰色线画笔 private int width; private int height; private int padding =5; private int value = 0; public DownLoadProgressView(Context context) {  this(context,null); } public DownLoadProgressView(Context context, AttributeSet attrs) {  this(context, attrs,0); } public DownLoadProgressView(Context context, AttributeSet attrs, int defStyleAttr) {  super(context, attrs, defStyleAttr);  initPaint(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {  super.onSizeChanged(w, h, oldw, oldh);  width = w;  height = h; } /**  * 初始化画笔  */ private void initPaint() {  paint = new Paint();  paint.setAntiAlias(true);  paint.setStrokeWidth(2);  paint.setStyle(Paint.Style.FILL);  paint.setColor(Color.BLUE);  textPaint = new Paint();  textPaint.setAntiAlias(true);  textPaint.setStrokeWidth(3);  textPaint.setStyle(Paint.Style.FILL);  textPaint.setColor(Color.BLUE);  textPaint.setTextSize(12);  dottePaint = new Paint();  dottePaint.setAntiAlias(true);  dottePaint.setStrokeWidth(2);  dottePaint.setStyle(Paint.Style.FILL);  dottePaint.setColor(Color.parseColor("#e5e5e5")); } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  String str = value+"%";  float strWidth = textPaint.measureText(value+"%")+padding;//绘制文字的宽度 +padding是为了防止在进度条加载完毕的时候文字绘制出现被切掉情况  Rect rect = new Rect();  textPaint.getTextBounds(str,0,str.length(),rect);  canvas.drawLine(0,height/2,value*((width-strWidth)/100),height/2,paint);//绘制进度  canvas.drawText(value+"%",value*((width-strWidth)/100)+padding,(height-rect.height())/2+2*padding,textPaint);//绘制进度文字 这个高度+2*padding是因为drawText是根据基线计算的,要准确的话要去求基线  canvas.drawLine(value*((width-strWidth)/100)+strWidth+padding,height/2,width,height/2,dottePaint);//绘制灰色进度表示剩余多少  postDelayed(new Runnable() {   @Override   public void run() {    if(value<100){     value++;     postInvalidate();    }   }  },100); }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#7EC0EE"> <com.tuya.DownLoadProgressView  android:id="@+id/dpv"  android:layout_width="fill_parent"  android:layout_height="30dp"  android:layout_marginLeft="10dp"  android:layout_marginRight="10dp"  android:layout_marginTop="60dp"  ></com.tuya.DownLoadProgressView></RelativeLayout>