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, attrs, 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(); } }); } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。