android倒计时控件 android实现圆环倒计时控件

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

 <!-- 倒计时控件属性 -->
 <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>

public class CountDownView extends View {
 //圆环颜色
 private int mRingColor;
 //圆环宽度
 private float mRingWidth;
 //圆环进度值文本大小
 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;


 ValueAnimator valueAnimator;

 /**
  * 监听事件
  */
 private OnCountDownListener mListener;

 public CountDownView(Context context) {
  this(context, null);

 }

 public CountDownView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);


 }

 public CountDownView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  // init();

  /**
   * 获取相关属性值
   */
  TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CountDownView);
  mRingColor = typedArray.getColor(R.styleable.CountDownView_ringColor, context.getResources().getColor(R.color.colorAccent));
  mRingWidth = typedArray.getFloat(R.styleable.CountDownView_ringWidth, 40);
  mRingProgessTextSize = typedArray.getDimensionPixelSize(R.styleable.CountDownView_progressTextSize, 20);
  mProgessTextColor = typedArray.getColor(R.styleable.CountDownView_progressTextColor, context.getResources().getColor(R.color.colorAccent));
  mCountdownTime = typedArray.getInteger(R.styleable.CountDownView_countdownTime, 60);
  typedArray.recycle();
  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mPaint.setAntiAlias(true);
  this.setWillNotDraw(false);

 }

 @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);
 }


 /**
  * 设置倒计时间 单位秒
  * @param mCountdownTime
  */
 public void setCountdownTime(int mCountdownTime) {
  this.mCountdownTime = mCountdownTime;

  invalidate();

 }

// public CountDownView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
//  super(context, attrs, defStyleAttr, defStyleRes);
// }

 /**
  * 动画
  * @param countdownTime
  * @return
  */
 private ValueAnimator getValueAnimator(long countdownTime) {
  ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 100);
  valueAnimator.setDuration(countdownTime);
  valueAnimator.setInterpolator(new LinearInterpolator());
  valueAnimator.setRepeatCount(0);
  return valueAnimator;
 }

 @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);
 }


 /**
  * 开始倒计时
  */
 public void startCountDown() {
  valueAnimator = getValueAnimator(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();
    }
   }

  });
 }


 /**
  * 停止倒计时
  */
 public void stopCountDdwn(){

  valueAnimator.cancel();


 }
 public void setOnCountDownListener(OnCountDownListener mListener) {
  this.mListener = mListener;
 }
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">

 <demo.com.countdowndemo.CountDownView
  android:id="@+id/countDownView"
  android:layout_width="50dp"
  android:layout_height="50dp"
  app:countdownTime="5"
  app:ringWidth="2"
  app:layout_constraintBottom_toBottomOf="parent"
  app:layout_constraintLeft_toLeftOf="parent"
  app:layout_constraintRight_toRightOf="parent"
  app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

public class MainActivity extends AppCompatActivity {

 CountDownView countDownView;

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

   countDownView = findViewById(R.id.countDownView);

  countDownView.setOnCountDownListener(new OnCountDownListener() {
   @Override
   public void countDownFinished() {
    //倒计时结束
    //countDownView.setCountdownTime(10);

    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
    startActivity(intent);
   }
  });

  countDownView.startCountDown();


  countDownView.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    countDownView.stopCountDdwn();
    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
    startActivity(intent);
   }
  });
 }
}