自定义Android圆形进度条(附源码)

本文实例讲述了Android自定义圆形进度条，分享给大家供大家参考。具体如下：
运行效果截图如下：

具体代码如下：

自定义的View:

import com.example.circlepregress.R;

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.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class RoundProgressBar extends View {

 // 画笔对象的引用
 private Paint paint;

 // 圆环的颜色
 private int roundColor;

 // 圆环进度的颜色
 private int roundProgressColor;

 // 中间进度百分比的字符串的颜色
 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;

 // 是否显示中间的进度
 private boolean textIsDisplayable;

 // 进度的风格，实心或者空心
 private int style;

 public static final int STROKE = 0;
 public static final int FILL = 1;

 /**
 * 构造方法
 */
 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);

 // 获取自定义属性和默认值
 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, 100);
 textIsDisplayable = mTypedArray.getBoolean(
  R.styleable.RoundProgressBar_textIsDisplayable, true);
 style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);

 mTypedArray.recycle();
 }

 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);

 // 画最外层的大圆环
 int centre = getWidth() / 2; // 获取圆心的x坐标
 int radius = (int) (centre - roundWidth / 2); // 圆环的半径
 paint.setColor(roundColor); // 设置圆环的颜色
 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

 Log.e("log", centre + "");

 /**
  * 画进度百分比
  */
 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 + "%"); // 测量字体宽度，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
 }

 /**
  * 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); // 设置进度的颜色
 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

 switch (style) {
 case STROKE: {
  paint.setStyle(Paint.Style.STROKE);
  canvas.drawArc(oval, 0, 360 * progress / max, false, paint); // 根据进度画圆弧
  break;
 }
 case FILL: {
  paint.setStyle(Paint.Style.FILL_AND_STROKE);
  if (progress != 0)
  canvas.drawArc(oval, 0, 360 * progress / max, true, paint); // 根据进度画圆弧
  break;
 }
 }

 }

 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;
 }

 /**
 * 获取进度.需要同步
 * 
 * @return
 */
 public synchronized int getProgress() {
 return progress;
 }

 /**
 * 设置进度，此为线程安全控件，由于考虑多线的问题，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();
 }

 }

 /******************** 下边是属性的get、set方法 ***************/
 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;
 }

} 

所需要的资源文件：attrs.xml

布局文件如下：

其中我们使用了这一句：

复制代码 代码如下:

xmlns:android_custom=http://schemas.android.com/apk/res/com.example.circlepregress

xmlns:android_custom是我们自己定义的标签，res/com.example.circlepregress其中res/后边的就是我们自定义View所在的目录

MainActivity.java如下：

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.example.circlepregress.R;

public class MainActivity extends Activity {
 private RoundProgressBar mRoundProgressBar1, mRoundProgressBar2 ,mRoundProgressBar3, mRoundProgressBar4, mRoundProgressBar5;
 private int progress = 0;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_cricle_progress);

 mRoundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);
 mRoundProgressBar2 = (RoundProgressBar) findViewById(R.id.roundProgressBar2);
 mRoundProgressBar3 = (RoundProgressBar) findViewById(R.id.roundProgressBar3);
 mRoundProgressBar4 = (RoundProgressBar) findViewById(R.id.roundProgressBar4);
 mRoundProgressBar5 = (RoundProgressBar) findViewById(R.id.roundProgressBar5);

 ((Button)findViewById(R.id.button1)).setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  new Thread(new Runnable() {

   @Override
   public void run() {
   while(progress <= 100){
    progress += 3;

    System.out.println(progress);

    mRoundProgressBar1.setProgress(progress);
    mRoundProgressBar2.setProgress(progress);
    mRoundProgressBar3.setProgress(progress);
    mRoundProgressBar4.setProgress(progress);
    mRoundProgressBar5.setProgress(progress);

    try {
    Thread.sleep(100);
    } catch (InterruptedException e) {
    e.printStackTrace();
    }
   }

   }
  }).start();
  }
 });

 }


}

项目免费下载： 《Android自定义圆形进度条》

希望本文所述对大家学习Android软件编程有所帮助。