Android自定义view绘制圆环占比动画

一、实现效果图

二、核心代码

1.自定义MyProgressView.java

package com.czhappy.effectdemo.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import com.czhappy.effectdemo.R;
import com.czhappy.effectdemo.utils.ScreenUtil;
public class MyProgressView extends View {
 // 画实心圆的画笔
 private Paint mCirclePaint;
 // 画圆环的画笔
 private Paint mRingDefaultPaint;
 // 已用环的画笔
 private Paint mUsePaint;
 // 画圆环的画笔
 private Paint mRingPaint;
 // 画白线的画笔
 private Paint mLinePaint;
 // 画字体的画笔
 private Paint mTextPaint;
 // 圆形颜色
 private int mCircleColor;
 // 圆环颜色
 private int mRingColor;
 // 半径
 private float mRadius;
 // 圆环半径
 private float mRingRadius;
 // 圆环宽度
 private float mStrokeWidth;
 // 圆心x坐标
 private int mXCenter;
 // 圆心y坐标
 private int mYCenter;
 // 字的长度
 private float mTxtWidth;
 // 字的高度
 private float mTxtHeight;
 // 总进度
 private int mTotalProgress = 100;
 // 当前进度
 private int mProgress;
 // 实际展示总进度
 private int mShowProgress;
 // 已用流量
 private String usedFlow;
 private Context mContext;
 private Handler circleHandler = new Handler(){
  public void handleMessage(Message msg) {
   super.handleMessage(msg);
   if(msg.what == 1){
    int temp = (Integer)msg.obj;
    setProgress(temp);
   }
  };
 };
 public MyProgressView(Context context, AttributeSet attrs) {
  super(context, attrs);
  mContext = context;
  // 获取自定义的属性
  initAttrs(context, attrs);
  initVariable();
 }
 private void initAttrs(Context context, AttributeSet attrs) {
  TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,
    R.styleable.TasksCompletedView, 0, 0);
  mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80);
  mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10);
  mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF);
  mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF);
  mRingRadius = mRadius + mStrokeWidth / 2;
 }
 private void initVariable() {
  //画圆画笔设置
  mCirclePaint = new Paint();
  mCirclePaint.setAntiAlias(true);//防锯齿
  mCirclePaint.setColor(mCircleColor);
  mCirclePaint.setStyle(Paint.Style.FILL);
  //“使用”字画笔设置
  mUsePaint = new Paint();
  mUsePaint.setAntiAlias(true);
  mUsePaint.setStyle(Paint.Style.FILL);
  mUsePaint.setColor(getResources().getColor(R.color.ticket_color));
  mUsePaint.setTextSize(ScreenUtil.sp2px(mContext, 10));
  //圆环画笔设置
  mRingDefaultPaint = new Paint();
  mRingDefaultPaint.setAntiAlias(true);
  mRingDefaultPaint.setColor(getResources().getColor(R.color.default_ring_color));
  mRingDefaultPaint.setStyle(Paint.Style.STROKE);
  mRingDefaultPaint.setStrokeWidth(mStrokeWidth);
  //已使用多少圆环画笔设置
  mRingPaint = new Paint();
  mRingPaint.setAntiAlias(true);
  mRingPaint.setColor(mRingColor);
  mRingPaint.setStyle(Paint.Style.STROKE);
  mRingPaint.setStrokeWidth(mStrokeWidth);
  mTextPaint = new Paint();
  mTextPaint.setAntiAlias(true);
  mTextPaint.setStyle(Paint.Style.FILL);
  mTextPaint.setColor(Color.BLACK);
  mTextPaint.setTextSize(ScreenUtil.sp2px(mContext, 22));
  mLinePaint = new Paint();
  mLinePaint.setColor(Color.WHITE);
  //获取字体高度
  FontMetrics fm = mTextPaint.getFontMetrics();
  mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
 }
 @Override
 protected void onDraw(Canvas canvas) {
  mXCenter = getWidth() / 2;
  mYCenter = getHeight() / 2;
  //画圆
  canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);
  RectF oval = new RectF();
  oval.left = (mXCenter - mRingRadius);
  oval.top = (mYCenter - mRingRadius);
  oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);
  oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
  //画整圆弧
  canvas.drawArc(oval, -90, 360, false, mRingDefaultPaint);
  //已使用多少圆弧
  canvas.drawArc(oval, -90, ((float) mProgress / mTotalProgress) * 360, false, mRingPaint);
  //文字绘制
  String txt = mProgress + "%";
  //文字的长度
  mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
  canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 9, mTextPaint);
  Rect _pb = new Rect();
  String sup = "已用";
  mUsePaint.getTextBounds(sup, 0, sup.length(), _pb);
  int perX = mXCenter - _pb.width() / 2;
  canvas.drawText(sup, perX, mYCenter / 2, mUsePaint);
  if (!TextUtils.isEmpty(usedFlow)) {
   mUsePaint.getTextBounds(usedFlow, 0, usedFlow.length(), _pb);
   perX = mXCenter - _pb.width() / 2;
   canvas.drawText(usedFlow, perX, (float) (mYCenter + mYCenter / 1.7), mUsePaint);
  }
  //画横线图片
  Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.circle_bottom_bg);
  perX = mXCenter - bitmap.getWidth() / 2;
  canvas.drawBitmap(bitmap, perX, (float) (mYCenter + mYCenter / 5), mLinePaint);
 }
 
 public void setProgress(int progress) {
  mProgress = progress;
  postInvalidate();
 }
 
 public void setmShowProgress(int progress) {
  mShowProgress = progress;
  new Thread(new CircleThread()).start();
 }
 public void setUsedFlow(String usedFlow) {
  this.usedFlow = usedFlow;
 }
 private class CircleThread implements Runnable{
  int m=0;
  int i=0;
  @Override
  public void run() {
   // TODO Auto-generated method stub
   while(!Thread.currentThread().isInterrupted()){
    try {
     Thread.sleep(50);
     m++;
     Message msg = new Message();
     msg.what = 1;
     if(i < mShowProgress){
      i += m;
     }else{
      i = mShowProgress;
      return;
     }
     msg.obj = i;
     circleHandler.sendMessage(msg);
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
 }
}

2.FlowActivity.java

package com.czhappy.effectdemo.activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import com.czhappy.effectdemo.R;
import com.czhappy.effectdemo.view.MyProgressView;

public class FlowActivity extends AppCompatActivity {
 private MyProgressView mTasksView;
 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_flow);
  initView();
 }
 private void initView() {
  mTasksView = (MyProgressView) findViewById(R.id.flow_prgress_view);
 }
 public void beginAnim(View view){
  mTasksView.setUsedFlow("200.0M");
  mTasksView.setmShowProgress(60);
 }
}

3.activity_flow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tc="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:padding="10dp"
 android:background="#fff"
 android:gravity="center_horizontal"
 android:orientation="vertical">
 <Button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:onClick="beginAnim"
  android:text="开始动画"/>
 <com.czhappy.effectdemo.view.MyProgressView
  android:id="@+id/flow_prgress_view"
  android:layout_width="100dp"
  android:layout_height="100dp"
  tc:circleColor="@color/circle_color"
  tc:radius="44dp"
  tc:ringColor="@color/ring_color"
  tc:strokeWidth="6dp"
  android:layout_marginTop="10dp"/>
</LinearLayout>

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