Android自定义圆形进度条

今天小编来手写一个自定义圆形进度条：先看效果：

首先我们在attrs属性文件中增加几个自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="CustomProgressBar">
 <!-- 圆形进度条进度显示的颜色 -->
 <attr name="roundProgressColor" format="color"></attr>
 <!-- 外圈圆的颜色 -->
 <attr name="roundColor" format="color"></attr>
 <!-- 圆的总宽度 -->
 <attr name="roundWidth" format="dimension"></attr>
 <!-- 字体显示的大小 -->
 <attr name="textSize" format="dimension"></attr>
 <!-- 字体显示的颜色-->
 <attr name="textColor" format="color"></attr>
 <!-- 进度的最大值 -->
 <attr name="max" format="integer"></attr>
 <!-- 是否显示文字 -->
 <attr name="textShow" format="boolean"></attr>
</declare-styleable>

</resources>

上我们自定义类的实现代码：

package xxx.xxx.xxx;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

import test.dn.com.dn_test.R;

/**
* Created by Administrator on 2017/5/16 0016.
*/

public class CircleProgressBar extends View {

private int max; //最大值
private int roundColor; //圆形进度条的颜色
private int roundProgressColor;//圆形进度条进度的颜色
private int textColor;  //字体的颜色
private float textSize;  //字体的大小
private float roundWidth; //圆的宽度
private boolean textShow; //是否显示圆
private int progress; //当前进度
private Paint mPaint; //画笔
public static final int STROKE = 0;
public static final int FILL = 1;

public CircleProgressBar(Context context, @Nullable AttributeSet attrs) {
 super(context, attrs);
 //初始化一只笔
 mPaint = new Paint();
 //获取xml当中设置的属性，如果没有设置，则设置一个默认值
 TypedArray typedArray = context.obtainStyledAttributes(attrs , R.styleable.CustomProgressBar);
 max = typedArray.getInteger(R.styleable.CustomProgressBar_max , 100);
 roundColor = typedArray.getColor(R.styleable.CustomProgressBar_roundColor, Color.RED);
 roundProgressColor = typedArray.getColor(R.styleable.CustomProgressBar_roundProgressColor , Color.BLUE);
 textColor = typedArray.getColor(R.styleable.CustomProgressBar_textColor , Color.GREEN);
 textSize = typedArray.getDimension(R.styleable.CustomProgressBar_textSize , 55);
 roundWidth = typedArray.getDimension(R.styleable.CustomProgressBar_roundWidth , 10);
 textShow = typedArray.getBoolean(R.styleable.CustomProgressBar_textShow , true);

}

@Override
protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 //画背景圆环
 int center = getWidth() / 2;
 //设置半径
 float radius = center - roundWidth / 2;
 //设置圆圈的颜色
 mPaint.setColor(roundColor);
 mPaint.setStyle(Paint.Style.STROKE);
 mPaint.setStrokeWidth(roundWidth);//圆环的宽度
 mPaint.setAntiAlias(true);//设置抗锯齿

//画外圈
 canvas.drawCircle(center , center ,radius , mPaint);

//画进度百分比
 mPaint.setColor(textColor);
 mPaint.setStrokeWidth(0);
 //设置字体大小
 mPaint.setTextSize(textSize);
 mPaint.setTypeface(Typeface.DEFAULT);
 //设置笔帽
 mPaint.setStrokeCap(Paint.Cap.ROUND);
 //设置文字的摆放方式为居中
 mPaint.setTextAlign(Paint.Align.CENTER);
 //获取当前进度的值
 int percent = (int) (progress / (float)max * 100);
 String strPercent = percent + "％";
 //获取画笔的文字属性，总共有bottom , top , leading , ascent , descent 这个以后会详细讲解
 Paint.FontMetricsInt fm = mPaint.getFontMetricsInt();
 if(percent != 0){
  canvas.drawText(strPercent , getWidth() / 2 ,
    getWidth() / 2 + (fm.bottom - fm.top) / 2 - fm.bottom, mPaint);
 }
 //画圆弧
 RectF oval = new RectF(center - radius , center - radius ,center + radius , center + radius);
 mPaint.setColor(roundProgressColor);
 mPaint.setStrokeWidth(roundWidth);
 mPaint.setStyle(Paint.Style.STROKE);
 //设置笔帽
 mPaint.setStrokeCap(Paint.Cap.ROUND);
 //话进度
 canvas.drawArc(oval , 0 , 360 * progress / max , false , mPaint);
}

public void setProgress(int progress){
 if(progress < 0){
  throw new IllegalArgumentException("进度progress不能小于0");
 }
 if(progress > max){
  progress = max;
 }
 if(progress <= max){
  this.progress = progress;
  postInvalidate();
 }

}
}

在我们的xml中设置控件：

<xxx.xxx.CircleProgressBar
 android:id="@+id/progressbar"
 android:layout_width="100dp"
 android:layout_height="100dp"
 app:roundProgressColor="#ff00ff"
 app:textColor="#666666"
 app:textSize="20dp"
 app:roundWidth="15dp"
 />

Activity功能实现代码：

mProgressBar = (CircleProgressBar) findViewById(R.id.progressbar);
 mProgressBar.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
   //模拟http请求
   new Thread(new Runnable() {
    @Override
    public void run() {
     while (progress <= 100){
      progress += 2;
      mProgressBar.setProgress(progress);
      //模拟网络请求，每隔100毫秒增加一个进度
      SystemClock.sleep(100);
     }
    }
   }).start();
  }
 });

完结！