Android-带有切换动画的CheckBox

转自：https://github.com/andyxialm/SmoothCheckBox

前言

切换带动画的效果确实不错，可能以后项目会用得到，所以转发收藏。

1，自定义 SmoothCheckBox 。

public class SmoothCheckBox extends View implements Checkable {
    private static final String KEY_INSTANCE_STATE = "InstanceState";
    private static final int COLOR_TICK      = Color.WHITE;
    private static final int COLOR_UNCHECKED = Color.WHITE;
    private static final int COLOR_CHECKED   = Color.parseColor("#FB4846");
    private static final int COLOR_FLOOR_UNCHECKED = Color.parseColor("#DFDFDF");
    private static final int DEF_ANIM_DURATION = 300;

    private Paint mPaint, mTickPaint, mFloorPaint;
    private Point[] mTickPoints;
    private Point mCenterPoint;
    private Path mTickPath;
    private float mLeftLineDistance, mRightLineDistance, mDrewDistance;
    private float mScaleVal = 1.0f, mFloorScale = 1.0f;
    private int mWidth, mAnimDuration, mStrokeWidth;
    private int mCheckedColor, mUnCheckedColor, mFloorColor, mFloorUnCheckedColor;
    private boolean mChecked;
    private boolean mTickDrawing;
    private OnCheckedChangeListener mListener;

    public SmoothCheckBox(Context context) {
        this(context, null);
    }

    public SmoothCheckBox(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SmoothCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(attrs);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SmoothCheckBox(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(attrs);
    }

    private void init(AttributeSet attrs) {

        TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.SmoothCheckBox);
        int tickColor = ta.getColor(R.styleable.SmoothCheckBox_color_tick, COLOR_TICK);
        mAnimDuration = ta.getInt(R.styleable.SmoothCheckBox_duration, DEF_ANIM_DURATION);
        mFloorColor = ta.getColor(R.styleable.SmoothCheckBox_color_unchecked_stroke, COLOR_FLOOR_UNCHECKED);
        mCheckedColor = ta.getColor(R.styleable.SmoothCheckBox_color_checked, COLOR_CHECKED);
        mUnCheckedColor = ta.getColor(R.styleable.SmoothCheckBox_color_unchecked, COLOR_UNCHECKED);
        mStrokeWidth = ta.getDimensionPixelSize(R.styleable.SmoothCheckBox_stroke_width,
                CompatUtils.dp2px(getContext(), 0));
        ta.recycle();

        mFloorUnCheckedColor = mFloorColor;
        mTickPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mTickPaint.setStyle(Paint.Style.STROKE);
        mTickPaint.setStrokeCap(Paint.Cap.ROUND);
        mTickPaint.setColor(tickColor);

        mFloorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mFloorPaint.setStyle(Paint.Style.FILL);
        mFloorPaint.setColor(mFloorColor);

        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setColor(mCheckedColor);

        mTickPath = new Path();
        mCenterPoint = new Point();
        mTickPoints = new Point[3];
        mTickPoints[0] = new Point();
        mTickPoints[1] = new Point();
        mTickPoints[2] = new Point();

        setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                toggle();
                mTickDrawing = false;
                mDrewDistance = 0;
                if (isChecked()) {
                    startCheckedAnimation();
                } else {
                    startUnCheckedAnimation();
                }
            }
        });
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        bundle.putParcelable(KEY_INSTANCE_STATE, super.onSaveInstanceState());
        bundle.putBoolean(KEY_INSTANCE_STATE, isChecked());
        return bundle;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle bundle = (Bundle) state;
            boolean isChecked = bundle.getBoolean(KEY_INSTANCE_STATE);
            setChecked(isChecked);
            super.onRestoreInstanceState(bundle.getParcelable(KEY_INSTANCE_STATE));
            return;
        }
        super.onRestoreInstanceState(state);
    }

    @Override
    public boolean isChecked() {
        return mChecked;
    }

    @Override
    public void toggle() {
        this.setChecked(!isChecked());
    }

    @Override
    public void setChecked(boolean checked) {
        mChecked = checked;
        reset();
        invalidate();
        if (mListener != null) {
            mListener.onCheckedChanged(SmoothCheckBox.this, mChecked);
        }
    }

    /**
     * 
checked with animation
     * @param checked checked
     * @param animate change with animation
     */
    public void setChecked(boolean checked, boolean animate) {
        if (animate) {
            mTickDrawing = false;
            mChecked = checked;
            mDrewDistance = 0f;
            if (checked) {
                startCheckedAnimation();//选中之后的动画
            } else {
                startUnCheckedAnimation();//取消选中的动画
            }
            if (mListener != null) {
                mListener.onCheckedChanged(SmoothCheckBox.this, mChecked);
            }

        } else {
            this.setChecked(checked);
        }
    }

    private void reset() {
        mTickDrawing = true;
        mFloorScale = 1.0f;
        mScaleVal = isChecked() ? 0f : 1.0f;
        mFloorColor = isChecked() ? mCheckedColor : mFloorUnCheckedColor;
        mDrewDistance = isChecked() ? (mLeftLineDistance + mRightLineDistance) : 0;
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        mWidth = getMeasuredWidth();
        mStrokeWidth = (mStrokeWidth == 0 ? getMeasuredWidth() / 10 : mStrokeWidth);
        mStrokeWidth = mStrokeWidth > getMeasuredWidth() / 5 ? getMeasuredWidth() / 5 : mStrokeWidth;
        mStrokeWidth = (mStrokeWidth < 3) ? 3 : mStrokeWidth;
        mCenterPoint.x = mWidth / 2;
        mCenterPoint.y = getMeasuredHeight() / 2;

        mTickPoints[0].x = Math.round((float) getMeasuredWidth() / 30 * 7);
        mTickPoints[0].y = Math.round((float) getMeasuredHeight() / 30 * 14);
        mTickPoints[1].x = Math.round((float) getMeasuredWidth() / 30 * 13);
        mTickPoints[1].y = Math.round((float) getMeasuredHeight() / 30 * 20);
        mTickPoints[2].x = Math.round((float) getMeasuredWidth() / 30 * 22);
        mTickPoints[2].y = Math.round((float) getMeasuredHeight() / 30 * 10);

        mLeftLineDistance = (float) Math.sqrt(Math.pow(mTickPoints[1].x - mTickPoints[0].x, 2) +
                Math.pow(mTickPoints[1].y - mTickPoints[0].y, 2));
        mRightLineDistance = (float) Math.sqrt(Math.pow(mTickPoints[2].x - mTickPoints[1].x, 2) +
                Math.pow(mTickPoints[2].y - mTickPoints[1].y, 2));
        mTickPaint.setStrokeWidth(mStrokeWidth);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        drawBorder(canvas);
        drawCenter(canvas);
        drawTick(canvas);
    }

    private void drawCenter(Canvas canvas) {
        mPaint.setColor(mUnCheckedColor);
        float radius = (mCenterPoint.x - mStrokeWidth) * mScaleVal;
        canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, radius, mPaint);
    }

    private void drawBorder(Canvas canvas) {
        mFloorPaint.setColor(mFloorColor);
        int radius = mCenterPoint.x;
        canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, radius * mFloorScale, mFloorPaint);
    }

    private void drawTick(Canvas canvas) {
        if (mTickDrawing && isChecked()) {
            drawTickPath(canvas);
        }
    }

    private void drawTickPath(Canvas canvas) {
        mTickPath.reset();
        // draw left of the tick
        if (mDrewDistance < mLeftLineDistance) {
            float step = (mWidth / 20.0f) < 3 ? 3 : (mWidth / 20.0f);
            mDrewDistance += step;
            float stopX = mTickPoints[0].x + (mTickPoints[1].x - mTickPoints[0].x) * mDrewDistance / mLeftLineDistance;
            float stopY = mTickPoints[0].y + (mTickPoints[1].y - mTickPoints[0].y) * mDrewDistance / mLeftLineDistance;

            mTickPath.moveTo(mTickPoints[0].x, mTickPoints[0].y);
            mTickPath.lineTo(stopX, stopY);
            canvas.drawPath(mTickPath, mTickPaint);

            if (mDrewDistance > mLeftLineDistance) {
                mDrewDistance = mLeftLineDistance;
            }
        } else {

            mTickPath.moveTo(mTickPoints[0].x, mTickPoints[0].y);
            mTickPath.lineTo(mTickPoints[1].x, mTickPoints[1].y);
            canvas.drawPath(mTickPath, mTickPaint);

            // draw right of the tick
            if (mDrewDistance < mLeftLineDistance + mRightLineDistance) {
                float stopX = mTickPoints[1].x + (mTickPoints[2].x - mTickPoints[1].x) * (mDrewDistance - mLeftLineDistance) / mRightLineDistance;
                float stopY = mTickPoints[1].y - (mTickPoints[1].y - mTickPoints[2].y) * (mDrewDistance - mLeftLineDistance) / mRightLineDistance;

                mTickPath.reset();
                mTickPath.moveTo(mTickPoints[1].x, mTickPoints[1].y);
                mTickPath.lineTo(stopX, stopY);
                canvas.drawPath(mTickPath, mTickPaint);

                float step = (mWidth / 20) < 3 ? 3 : (mWidth / 20);
                mDrewDistance += step;
            } else {
                mTickPath.reset();
                mTickPath.moveTo(mTickPoints[1].x, mTickPoints[1].y);
                mTickPath.lineTo(mTickPoints[2].x, mTickPoints[2].y);
                canvas.drawPath(mTickPath, mTickPaint);
            }
        }

        // invalidate
        if (mDrewDistance < mLeftLineDistance + mRightLineDistance) {
            postDelayed(new Runnable() {
                @Override
                public void run() {
                    postInvalidate();
                }
            }, 10);
        }
    }

    private void startCheckedAnimation() {
        ValueAnimator animator = ValueAnimator.ofFloat(1.0f, 0f);
        animator.setDuration(mAnimDuration / 3 * 2);
        animator.setInterpolator(new LinearInterpolator());
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mScaleVal = (float) animation.getAnimatedValue();
                mFloorColor = getGradientColor(mUnCheckedColor, mCheckedColor, 1 - mScaleVal);
                postInvalidate();
            }
        });
        animator.start();

        ValueAnimator floorAnimator = ValueAnimator.ofFloat(1.0f, 0.8f, 1.0f);
        floorAnimator.setDuration(mAnimDuration);
        floorAnimator.setInterpolator(new LinearInterpolator());
        floorAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mFloorScale = (float) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        floorAnimator.start();

        drawTickDelayed();
    }

    private void startUnCheckedAnimation() {
        ValueAnimator animator = ValueAnimator.ofFloat(0f, 1.0f);
        animator.setDuration(mAnimDuration);
        animator.setInterpolator(new LinearInterpolator());
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mScaleVal = (float) animation.getAnimatedValue();
                mFloorColor = getGradientColor(mCheckedColor, COLOR_FLOOR_UNCHECKED, mScaleVal);
                postInvalidate();
            }
        });
        animator.start();

        ValueAnimator floorAnimator = ValueAnimator.ofFloat(1.0f, 0.8f, 1.0f);
        floorAnimator.setDuration(mAnimDuration);
        floorAnimator.setInterpolator(new LinearInterpolator());
        floorAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mFloorScale = (float) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        floorAnimator.start();
    }

    private void drawTickDelayed() {
        postDelayed(new Runnable() {
            @Override
            public void run() {
                mTickDrawing = true;
                postInvalidate();
            }
        }, mAnimDuration);
    }

    private static int getGradientColor(int startColor, int endColor, float percent) {
        int sr = (startColor & 0xff0000) >> 0x10;
        int sg = (startColor & 0xff00) >> 0x8;
        int sb = (startColor & 0xff);

        int er = (endColor & 0xff0000) >> 0x10;
        int eg = (endColor & 0xff00) >> 0x8;
        int eb = (endColor & 0xff);

        int cr = (int) (sr * (1 - percent) + er * percent);
        int cg = (int) (sg * (1 - percent) + eg * percent);
        int cb = (int) (sb * (1 - percent) + eb * percent);
        return Color.argb(0xff, cr, cg, cb);
    }

    public void setOnCheckedChangeListener(OnCheckedChangeListener l) {
        this.mListener = l;
    }

    public interface OnCheckedChangeListener {
        void onCheckedChanged(SmoothCheckBox checkBox, boolean isChecked);
    }
}

2，在布局文件中引用这个定义的CheckBox控件。

<LinearLayout 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"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cn.refactor.smoothcheckbox.MainActivity">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="horizontal">

        <cn.refactor.library.SmoothCheckBox
            android:id="@+id/mcb"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_margin="5dp"
            app:color_checked="@color/colorAccent" />

        <cn.refactor.library.SmoothCheckBox
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_margin="5dp"
            app:color_checked="#447eeb" />

        <cn.refactor.library.SmoothCheckBox
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_margin="5dp"
            app:color_checked="#149A45" />

        <cn.refactor.library.SmoothCheckBox
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_margin="5dp" />


    LinearLayout>

LinearLayout>

3，使用

 setChecked(boolean checked);                   // 默认不带动画，若需要动画 调用重载方法
 setChecked(boolean checked, boolean animate);  // 参数: animate 是否显示动画

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sample);

        final SmoothCheckBox mcb = (SmoothCheckBox) findViewById(R.id.mcb);
        mcb.setOnCheckedChangeListener(new SmoothCheckBox.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(SmoothCheckBox checkBox, boolean isChecked) {
                Log.d("MellowCheckBox", String.valueOf(isChecked));
            }
        });
    }