android自定义view实现数字进度条

之前看到过一个数字进度条,一直想写,今天就把这个实现下,想起来也是很简单的,先看下实现的效果：

思路：

绘制2根线 绘制进度条的文字,不断的改变起点和终点,然后没多少时间去更新UI就ok,在这就不画图了,看代码就看的明白,不要想的很复杂!

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);
}
}

布局文件：

<?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>

github:NumberProgress

来源：https://blog.csdn.net/coderinchina/article/details/53738098