Android自定义View倒计时圆

概述本文实例为大家分享了Android自定义View倒计时圆的具体代码，供大家参考，具体内容如下

本文实例为大家分享了AndroID自定义view倒计时圆的具体代码，供大家参考，具体内容如下

 

创建attr

<?xml version="1.0" enCoding="utf-8"?><resources>  <declare-styleable name="CountDownVIEw">    <!--颜色-->    <attr name="ringcolor" format="color" />    <!-- 进度文本的字体大小 -->    <attr name="progresstextSize" format="dimension" />    <!-- 圆环宽度 -->    <attr name="ringWIDth" format="float" />    <!--进度文本颜色-->    <attr name="progresstextcolor" format="color"/>    <!--倒计时-->    <attr name="countdownTime" format="integer"/>  </declare-styleable></resources>

创建displayUtil 类

import androID.content.Context;/** * Created by 王 on 2017/10/21. */public class displayUtil {  /**   * 将px装换成dp，保证尺寸不变   * @param context   * @param pxValue   * @return   */  public static int px2dp(Context context,float pxValue){    float density = context.getResources().getdisplayMetrics().density;//得到设备的密度    return (int) (pxValue/density+0.5f);  }  public static int dp2px(Context context,float dpValue){    float density = context.getResources().getdisplayMetrics().density;    return (int) (dpValue*density+0.5f);  }  public static int px2sp(Context context,float pxValue){    float scaleDensity = context.getResources().getdisplayMetrics().scaledDensity;//缩放密度    return (int) (pxValue/scaleDensity+0.5f);  }  public static int sp2px(Context context,float spValue) {    float scaleDensity = context.getResources().getdisplayMetrics().scaledDensity;    return (int) (spValue*scaleDensity+0.5f);  }}

继承VIEw

import androID.animation.Animator;import androID.animation.AnimatorListenerAdapter;import androID.animation.ValueAnimator;import androID.content.Context;import androID.content.res.TypedArray;import androID.graphics.Canvas;import androID.graphics.Paint;import androID.graphics.RectF;import androID.util.AttributeSet;import androID.vIEw.VIEw;import androID.vIEw.animation.linearInterpolator;/** * Created by 王 on 2017/10/21. */public class CountDownVIEw extends VIEw{  //圆轮颜色  private int mRingcolor;  //圆轮宽度  private float mRingWIDth;  //圆轮进度值文本大小  private int mRingProgesstextSize;  //宽度  private int mWIDth;  //高度  private int mHeight;  private Paint mPaint;  //圆环的矩形区域  private RectF mRectF;  //  private int mProgesstextcolor;  private int mCountdownTime;  private float mCurrentProgress;  private OnCountDownFinishListener mListener;  public CountDownVIEw(Context context) {    this(context,null);  }  public CountDownVIEw(Context context,AttributeSet attrs) {    this(context,attrs,0);  }  public CountDownVIEw(Context context,AttributeSet attrs,int defStyleAttr) {    super(context,defStyleAttr);    TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.CountDownVIEw);    mRingcolor = a.getcolor(R.styleable.CountDownVIEw_ringcolor,context.getResources().getcolor(R.color.colorAccent));    mRingWIDth = a.getfloat(R.styleable.CountDownVIEw_ringWIDth,40);    mRingProgesstextSize = a.getDimensionPixelSize(R.styleable.CountDownVIEw_progresstextSize,displayUtil.sp2px(context,20));    mProgesstextcolor = a.getcolor(R.styleable.CountDownVIEw_progresstextcolor,context.getResources().getcolor(R.color.colorAccent));    mCountdownTime = a.getInteger(R.styleable.CountDownVIEw_countdownTime,10);    a.recycle();    mPaint = new Paint(Paint.ANTI_AliAS_FLAG);    mPaint.setAntiAlias(true);    this.setwillNotDraw(false);  }  public voID setCountdownTime(int mCountdownTime) {    this.mCountdownTime = mCountdownTime;  }  @OverrIDe  protected voID onLayout(boolean changed,int left,int top,int right,int bottom) {    super.onLayout(changed,left,top,right,bottom);    mWIDth = getMeasureDWIDth();    mHeight = getMeasuredHeight();    mRectF = new RectF(0 + mRingWIDth / 2,0 + mRingWIDth / 2,mWIDth - mRingWIDth / 2,mHeight - mRingWIDth / 2);  }  @OverrIDe  protected voID onDraw(Canvas canvas) {    super.onDraw(canvas);    /**     *圆环     */    //颜色    mPaint.setcolor(mRingcolor);    //空心    mPaint.setStyle(Paint.Style.stroke);    //宽度    mPaint.setstrokeWIDth(mRingWIDth);    canvas.drawArc(mRectF,-90,mCurrentProgress - 360,false,mPaint);    //绘制文本    Paint textPaint = new Paint();    textPaint.setAntiAlias(true);    textPaint.setTextAlign(Paint.Align.CENTER);    String text = mCountdownTime - (int) (mCurrentProgress / 360f * mCountdownTime) + "";    textPaint.setTextSize(mRingProgesstextSize);    textPaint.setcolor(mProgesstextcolor);    //文字居中显示    Paint.FontMetricsInt FontMetrics = textPaint.getFontMetricsInt();    int baseline = (int) ((mRectF.bottom + mRectF.top - FontMetrics.bottom - FontMetrics.top) / 2);    canvas.drawText(text,mRectF.centerX(),baseline,textPaint);  }  private ValueAnimator getValA(long countdownTime) {    ValueAnimator valueAnimator = ValueAnimator.offloat(0,100);    valueAnimator.setDuration(countdownTime);    valueAnimator.setInterpolator(new linearInterpolator());    valueAnimator.setRepeatCount(0);    return valueAnimator;  }  /**   * 开始倒计时   */  public voID startCountDown() {    setClickable(false);    ValueAnimator valueAnimator = getValA(mCountdownTime * 1000);    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {      @OverrIDe      public voID onAnimationUpdate(ValueAnimator animation) {        float i = float.valueOf(String.valueOf(animation.getAnimatedValue()));        mCurrentProgress = (int) (360 * (i / 100f));        invalIDate();      }    });    valueAnimator.start();    valueAnimator.addListener(new AnimatorListenerAdapter() {      @OverrIDe      public voID onAnimationEnd(Animator animation) {        super.onAnimationEnd(animation);        //倒计时结束回调        if (mListener != null) {          mListener.countDownFinished();        }        setClickable(true);      }    });  }  public voID setAddCountDownListener(OnCountDownFinishListener mListener) {    this.mListener = mListener;  }  public interface OnCountDownFinishListener {    voID countDownFinished();  }}

布局

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:app="http://schemas.androID.com/apk/res-auto"  xmlns:tools="http://schemas.androID.com/tools"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  tools:context="com.example.circulardemo.MainActivity">  <com.example.circulardemo.CountDownVIEw    androID:ID="@+ID/cdv"    androID:layout_wIDth="50dp"    androID:layout_height="50dp"    androID:layout_centerVertical="true"    androID:layout_centerHorizontal="true" /></relativeLayout>

Mainactivity

import androID.os.Bundle;import androID.support.v7.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    CountDownVIEw countDownVIEw = (CountDownVIEw) findVIEwByID(R.ID.cdv);    //启动    countDownVIEw.startCountDown();    countDownVIEw.setAddCountDownListener(new CountDownVIEw.OnCountDownFinishListener() {      @OverrIDe      public voID countDownFinished() {        Toast.makeText(MainActivity.this,"倒计时结束",Toast.LENGTH_SHORT).show();      }    });  }}

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