android 自定义表盘控件

效果图如下

attrs.xml

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

FlowView.java

package com.hutao.liaoningmobile.view;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.TimeInterpolator;import android.animation.ValueAnimator;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.view.View;import com.hutao.liaoningmobile.R;/** * Created by aoc on 2016/10/10. */public class FlowView extends View {    private final Rect mBound;    private int part1Color;    private int part2Color;    private int part3Color;    private int scaleFontColor;    private int scaleFontSize;    private int radius;    private int arcWidth;    private int offset;    private float startAngle = 135f;    private float sweepAngle = 90f;    private Paint paint;    private RectF rectF;    private Paint textPaint;    private String[] scaleText = {"0", "15", "30", "45", "60", "75", "90", "105", "120", "135"};    private float percent;    private float oldPercent = 0f;    private float speed;    private ValueAnimator valueAnimator;    private long animatorDuration;    private TimeInterpolator interpolator = new SpringInterpolator();    public FlowView(Context context) {        this(context, null);    }    public FlowView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public FlowView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.FlowView, defStyleAttr, 0);        int count = array.getIndexCount();        for (int i = 0; i < count; i++) {            int attr = array.getIndex(i);            switch (attr) {                case R.styleable.FlowView_part1_color:                    part1Color = array.getColor(attr, Color.WHITE);                    break;                case R.styleable.FlowView_part2_color:                    part2Color = array.getColor(attr, Color.WHITE);                    break;                case R.styleable.FlowView_part3_color:                    part3Color = array.getColor(attr, Color.WHITE);                    break;                case R.styleable.FlowView_scale_font_color:                    scaleFontColor = array.getColor(attr, Color.WHITE);                    break;                case R.styleable.FlowView_scale_font_size:                    scaleFontSize = array.getDimensionPixelSize(attr,                            (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, context.getResources().getDisplayMetrics()));                    break;                case R.styleable.FlowView_radius:                    radius = array.getDimensionPixelSize(attr,                            (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, context.getResources().getDisplayMetrics()));                    break;                case R.styleable.FlowView_arc_width:                    arcWidth = array.getDimensionPixelSize(attr,                            (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, context.getResources().getDisplayMetrics()));                    break;                case R.styleable.FlowView_offset:                    offset = array.getDimensionPixelSize(attr,                            (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16, context.getResources().getDisplayMetrics()));                    break;            }        }        array.recycle();        paint = new Paint();        paint.setAntiAlias(true);        rectF = new RectF();        textPaint = new Paint();        textPaint.setAntiAlias(true);        textPaint.setTextSize(scaleFontSize);        textPaint.setColor(scaleFontColor);        mBound = new Rect();        textPaint.getTextBounds(String.valueOf(speed), 0, String.valueOf(speed).length(), mBound);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int widthSize = MeasureSpec.getSize(widthMeasureSpec);        int heightMode = MeasureSpec.getMode(heightMeasureSpec);        int heightSize = MeasureSpec.getSize(heightMeasureSpec);        int width;        int height ;        if (widthMode == MeasureSpec.EXACTLY) {            width = widthSize;        }        else {            width = radius * 2 + arcWidth;        }        if (heightMode == MeasureSpec.EXACTLY) {            height = heightSize;        }        else {            height = radius * 2 + arcWidth;        }        setMeasuredDimension(width, height);    }    @Override    protected void onDraw(Canvas canvas) {        drawArc(canvas);        drawScale(canvas);        drawPointer(canvas);        drawUnit(canvas);        drawSpeed(canvas);    }    //画表盘    private void drawArc(Canvas canvas) {//        paint.setColor(Color.BLUE);//        canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), paint);        paint.setColor(part1Color);        paint.setStyle(Paint.Style.STROKE);        paint.setStrokeWidth(arcWidth);        int left = getWidth() / 2;        int top = getHeight() / 2;        rectF.set(left - radius, top - radius , left + radius , top + radius );        canvas.drawArc(rectF, startAngle, sweepAngle, false,paint);        paint.setColor(part2Color);        canvas.drawArc(rectF, startAngle + sweepAngle, sweepAngle, false,paint);        paint.setColor(part3Color);        canvas.drawArc(rectF, startAngle + sweepAngle * 2, sweepAngle, false,paint);        //圆心        paint.setColor(Color.YELLOW);        canvas.drawCircle(rectF.centerX(), rectF.centerY(), 10, paint);    }    //画刻度    private void drawScale(Canvas canvas) {        canvas.save(); //记录画布状态        paint.setColor(scaleFontColor);        paint.setStrokeWidth(3);        canvas.rotate(-90f, rectF.centerX(), rectF.centerY());        float rAngle = sweepAngle * 3 / (scaleText.length - 1);        for (int i = 0; i < scaleText.length  ; i++) {            canvas.save(); //记录画布状态            canvas.rotate(rAngle * i, rectF.centerX(), rectF.centerY());            float startX = rectF.centerX() - radius + arcWidth * 4 - offset;            float startY = rectF.centerY() - radius + arcWidth * 4 - offset;            canvas.drawLine(startX, startY , startX + 15, startY + 15, paint);//画短刻度线            canvas.drawText(scaleText[i] , startX + 25, startY + 35,  textPaint);            canvas.restore();        }        canvas.restore();    }    //画指针    private void drawPointer(Canvas canvas) {        canvas.save();        canvas.rotate(percent, rectF.centerX(), rectF.centerY());        canvas.drawLine(rectF.centerX(), rectF.centerY(), rectF.centerX() - radius / 2 + 20 , rectF.centerY() + radius / 2 - 20, paint);        canvas.restore();    }    //单位    private void drawUnit(Canvas canvas) {        textPaint.setColor(Color.GRAY);        textPaint.setTextSize(scaleFontSize / 1.2f);        canvas.drawText("Kbps", rectF.centerX() - mBound.width() / 2 - arcWidth / 3, rectF.centerY() +  radius / 2  + arcWidth, textPaint);    }    //显示速度    private void drawSpeed(Canvas canvas) {        textPaint.setColor(Color.YELLOW);        textPaint.setTextSize(scaleFontSize);        canvas.drawText(String.valueOf(speed), rectF.centerX() - mBound.width() / 2, rectF.centerY() + radius - arcWidth, textPaint);    }    public void setSpeed(float speed) {        this.speed = speed;        percent = sweepAngle * 3 / 135 * speed;        setAnimator(percent);    }    //动画    private void setAnimator(final float percent) {        if (valueAnimator != null && valueAnimator.isRunning()) {            valueAnimator.cancel();        }        animatorDuration = (long) Math.abs(percent - oldPercent) * 20;        valueAnimator = ValueAnimator.ofFloat(oldPercent, percent).setDuration(animatorDuration);        valueAnimator.setInterpolator(interpolator);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                FlowView.this.percent = (float) animation.getAnimatedValue();                invalidate();            }        });        valueAnimator.addListener(new AnimatorListenerAdapter() {            @Override            public void onAnimationEnd(Animator animation) {                super.onAnimationEnd(animation);                oldPercent = percent;            }        });        valueAnimator.start();    }}

SpringInterpolator

package com.hutao.liaoningmobile.view;import android.view.animation.Interpolator;/** * Created by aoc on 2016/10/11. */public class SpringInterpolator implements Interpolator {    private final float mTension;    public SpringInterpolator() {        mTension = 0.4f;    }    public SpringInterpolator(float tension) {        mTension = tension;    }    @Override    public float getInterpolation(float input) {        float result = (float) (Math.pow(2,-10 * input) *                Math.sin((input - mTension / 4) * (2 * Math.PI)/mTension) + 1);        return result;    }}

main.xml

mainactivity.java

        FlowView flowView = (FlowView) view.findViewById(R.id.flow_view_id);        flowView.setSpeed(100f);

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