android ——自定义计步器

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一、运行效果展示

在这里插入图片描述

二、代码解析：

1、res — values下新建attrs.xml文件:

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="QQStepView">
<!--       定义两个圆弧的颜色--><attr name="outerColor" format="color"/> <attr name="innerColor" format="color"/>
<!--       圆弧边框大小，两个边框尺寸一样，只定义一个即可--><attr name="borderWidth" format="dimension"/>
<!--       圆弧内字体的大小和颜色--><attr name="stepTextSize" format="dimension"/><attr name="stepTextColor" format="color"/></declare-styleable>
</resources>

2、新建QQStepView类继承View

public class QQStepView extends View {private int mOuterColor= Color.RED;private int mInnerColor=Color.BLUE;private int mBorderWidth=20;private int mStepTextSize;private int mStepTextColor;//    画外圆的画笔private Paint mOutPaint;
//    画内圆的画笔private Paint mInterPaint;
//    文字画笔private Paint mTextPaint;//   总共的private int mStepMax=0;
//    当前的步数private int mCurrentStep=0;public QQStepView(Context context) {this(context,null);}public QQStepView(Context context, @Nullable AttributeSet attrs) {this(context, attrs,0);}public QQStepView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);
//        1、分析效果
//        2、确定自定义属性，编写attrs.xml文件
//        3、在布局文件中使用
//        4、在自定义view中获取自定义属性TypedArray array= context.obtainStyledAttributes(attrs, R.styleable.QQStepView);mOuterColor=array.getColor(R.styleable.QQStepView_outerColor,mOuterColor);mInnerColor=array.getColor(R.styleable.QQStepView_innerColor,mInnerColor);mBorderWidth=(int) array.getDimension(R.styleable.QQStepView_borderWidth,mBorderWidth);mStepTextColor=array.getColor(R.styleable.QQStepView_stepTextColor,mStepTextColor);mStepTextSize=array.getDimensionPixelSize(R.styleable.QQStepView_stepTextSize,mStepTextSize);array.recycle();mOutPaint=new Paint();mOutPaint.setColor(mOuterColor);mOutPaint.setStrokeWidth(mBorderWidth); //画笔宽度mOutPaint.setAntiAlias(true); //抗锯齿mOutPaint.setStrokeCap(Paint.Cap.ROUND); // 圆弧末尾圆角mOutPaint.setStyle(Paint.Style.STROKE); //设置画笔空心mInterPaint=new Paint();mInterPaint.setColor(mInnerColor);mInterPaint.setStrokeWidth(mBorderWidth); //画笔宽度mInterPaint.setAntiAlias(true); //抗锯齿mInterPaint.setStrokeCap(Paint.Cap.ROUND); // 圆弧末尾圆角mInterPaint.setStyle(Paint.Style.STROKE); //设置画笔空心mTextPaint=new Paint();mTextPaint.setColor(mInnerColor);mTextPaint.setAntiAlias(true); //抗锯齿mTextPaint.setTextSize(mStepTextSize);
//        5、onMeasure
//        6、画外圆弧、内圆弧和文字
//        7、其他}//5、onMeasure@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//        调用者在布局文件可能是wrap_content
//        宽高不一致取最小值，确保是一个正方型int width = MeasureSpec.getSize(widthMeasureSpec);int height = MeasureSpec.getSize(heightMeasureSpec);setMeasuredDimension(Math.min(width, height), Math.min(width, height));}//6、画外圆弧、内圆弧和文字@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//        6.1、画外圆弧
//        中心点int center=getWidth()/2;int radius=getWidth()/2-mBorderWidth/2;
//        RectF rectF=new RectF(mBorderWidth/2,mBorderWidth/2,getWidth()-mBorderWidth/2,
//                getHeight()-mBorderWidth/2);RectF rectF=new RectF(center-radius,center-radius,center+radius,center+radius);canvas.drawArc(rectF,135,270,false,mOutPaint);
//        6.2、画内圆弧 ,值从外面传进来if (mStepMax == 0) return;float sweepAngle=(float) mCurrentStep/mStepMax;canvas.drawArc(rectF,135,sweepAngle*270,false,mInterPaint);
//        6.3、画文字String stepText=mCurrentStep+"";Rect textBounds=new Rect();mTextPaint.getTextBounds(stepText,0,stepText.length(),textBounds);int dx= getWidth()/2-textBounds.width()/2;
//        基线Paint.FontMetricsInt fontMetricsInt=mTextPaint.getFontMetricsInt();int dy=(fontMetricsInt.bottom - fontMetricsInt.top)/2-fontMetricsInt.bottom;int baseLine=getHeight()/2+dy;canvas.drawText(stepText,dx,baseLine,mTextPaint);}
//    7、其它，添加动画public void setStepMax(int stepMax){this.mStepMax=stepMax;}public synchronized void setCurrentStep(int currentStep){this.mCurrentStep=currentStep;invalidate(); //不断重绘}
}

3、页面xml文件中引入：

<?xml version="1.0" encoding="utf-8"?>
<layout 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"><data></data><androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"tools:context=".CustomViewActivity"><com.lxd.androiduidemo.view.QQStepViewandroid:id="@+id/step_view"app:outerColor="@color/purple_700"app:innerColor="@color/teal_700"app:borderWidth="16dp"app:stepTextColor="@color/teal_700"app:stepTextSize="36sp"android:layout_width="200dp"android:layout_height="200dp"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintBottom_toBottomOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>
</layout>

四、页面中设置最大值，运动步数和动画：

    private ActivityCustomViewBinding customViewBinding;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);customViewBinding = DataBindingUtil.setContentView(this, R.layout.activity_custom_view);QQStepView stepView = customViewBinding.stepView;stepView.setStepMax(4000); //设置最大值stepView.setCurrentStep(3000); // 最大步数//        添加属性动画ValueAnimator animator=ObjectAnimator.ofFloat(0,3000);animator.setDuration(2000);animator.setInterpolator(new DecelerateInterpolator());//添加插值器（动画执行先快后慢）animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(@NonNull ValueAnimator animation) {float currentStep = (float)animation.getAnimatedValue();stepView.setCurrentStep((int) currentStep);}});animator.start();}