android自定義view實現數字進度條

這篇文章主要爲大家詳細介紹了android自定義view實現數字進度條，具有一定的參考價值，感興趣的小夥伴們可以參考一下

之前看到過一個數字進度條,一直想寫,今天就把這個實現下,想起來也是很簡單的,先看下實現的效果：

思路：

繪製2根線 繪製進度條的文字,不斷的改變起點和終點,然後沒多少時間去更新UI就ok,在這就不畫圖了,看代碼就看的明白,不要想的很複雜!

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;//繪製進度條畫筆
 private Paint textPaint;//繪製文字畫筆
 private Paint dottePaint;//繪製灰色線畫筆
 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;
 }
 /**
  * 初始化畫筆
  */
 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;//繪製文字的寬度 +padding是爲了防止在進度條加載完畢的時候文字繪製出現被切掉情況
  Rect rect = new Rect();
  textPaint.getTextBounds(str,0,str.length(),rect);
  canvas.drawLine(0,height/2,value*((width-strWidth)/100),height/2,paint);//繪製進度
  canvas.drawText(value+"%",value*((width-strWidth)/100)+padding,(height-rect.height())/2+2*padding,textPaint);//繪製進度文字 這個高度+2*padding是因爲drawText是根據基線計算的,要準確的話要去求基線
  canvas.drawLine(value*((width-strWidth)/100)+strWidth+padding,height/2,width,height/2,dottePaint);//繪製灰色進度表示剩餘多少
  postDelayed(new Runnable() {
   @Override
   public void run() {
    if(value<100){
     value++;
     postInvalidate();
    }
   }
  },100);
 }
}

佈局文件：

<?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

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持神馬文庫。