自定义switchview
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public class SwitchView extends View { private final int DEFAULT_COLOR_PRIMARY = 0xFF4BD763;//switch 默认值 private final int DEFAULT_COLOR_PRIMARY_DARK = 0xFF3AC652; private final float RATIO_ASPECT = 0.68f; private final float ANIMATION_SPEED = 0.1f; // (0,1] private static final int STATE_SWITCH_ON = 4; // you change value you die private static final int STATE_SWITCH_ON2 = 3; private static final int STATE_SWITCH_OFF2 = 2; private static final int STATE_SWITCH_OFF = 1; private final AccelerateInterpolator interpolator = new AccelerateInterpolator(2); private final Paint paint = new Paint(); private final Path sPath = new Path(); private final Path bPath = new Path(); private final RectF bRectF = new RectF(); private float sAnim, bAnim; private RadialGradient shadowGradient; private int state; private int lastState; private boolean isCanVisibleDrawing = false; private OnClickListener mOnClickListener; private int colorPrimary; private int colorPrimaryDark; private boolean hasShadow; private boolean isOpened; private int mWidth, mHeight; private int actuallyDrawingAreaLeft; private int actuallyDrawingAreaRight; private int actuallyDrawingAreaTop; private int actuallyDrawingAreaBottom; private float sWidth, sHeight; private float sLeft, sTop, sRight, sBottom; private float sCenterX, sCenterY; private float sScale; private float bOffset; private float bRadius, bStrokeWidth; private float bWidth; private float bLeft, bTop, bRight, bBottom; private float bOnLeftX, bOn2LeftX, bOff2LeftX, bOffLeftX; private float shadowReservedHeight; public SwitchView(Context context) { this(context, null); } @TargetApi(Build.VERSION_CODES.HONEYCOMB) public SwitchView(Context context, AttributeSet attrs) { super(context, attrs); setLayerType(LAYER_TYPE_SOFTWARE, null); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SwitchView); colorPrimary = a.getColor(R.styleable.SwitchView_primaryColor, DEFAULT_COLOR_PRIMARY); colorPrimaryDark = a.getColor(R.styleable.SwitchView_primaryColorDark, DEFAULT_COLOR_PRIMARY_DARK); hasShadow = a.getBoolean(R.styleable.SwitchView_hasShadow, true); isOpened = a.getBoolean(R.styleable.SwitchView_isOpened, false); state = isOpened ? STATE_SWITCH_ON : STATE_SWITCH_OFF; lastState = state; a.recycle(); if (colorPrimary == DEFAULT_COLOR_PRIMARY && colorPrimaryDark == DEFAULT_COLOR_PRIMARY_DARK) { try { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { TypedValue primaryColorTypedValue = new TypedValue(); context.getTheme().resolveAttribute(android.R.attr.colorPrimary, primaryColorTypedValue, true); if (primaryColorTypedValue.data > 0) colorPrimary = primaryColorTypedValue.data; TypedValue primaryColorDarkTypedValue = new TypedValue(); context.getTheme().resolveAttribute(android.R.attr.colorPrimaryDark, primaryColorDarkTypedValue, true); if (primaryColorDarkTypedValue.data > 0) colorPrimaryDark = primaryColorDarkTypedValue.data; } } catch (Exception e) { e.printStackTrace(); } } } /** * TODO 设置新的颜色 * @param newColorPrimary * @param newColorPrimaryDark */ public void setColor(int newColorPrimary, int newColorPrimaryDark) { colorPrimary = newColorPrimary; colorPrimaryDark = newColorPrimaryDark; invalidate(); } /** * TODO 设置是否有阴影 * @param shadow */ public void setShadow(boolean shadow) { hasShadow = shadow; invalidate(); } public boolean isOpened() { return isOpened; } /** * TODO 设置是否打开 * @param isOpened */ public void setOpened(boolean isOpened) { int wishState = isOpened ? STATE_SWITCH_ON : STATE_SWITCH_OFF; if (wishState == state) { return; } refreshState(wishState); } public void toggleSwitch(boolean isOpened) { int wishState = isOpened ? STATE_SWITCH_ON : STATE_SWITCH_OFF; if (wishState == state) { return; } if ((wishState == STATE_SWITCH_ON && (state == STATE_SWITCH_OFF || state == STATE_SWITCH_OFF2)) || (wishState == STATE_SWITCH_OFF && (state == STATE_SWITCH_ON || state == STATE_SWITCH_ON2))) { sAnim = 1; } bAnim = 1; refreshState(wishState); } private void refreshState(int newState) { if (!isOpened && newState == STATE_SWITCH_ON) { isOpened = true; } else if (isOpened && newState == STATE_SWITCH_OFF) { isOpened = false; } lastState = state; state = newState; postInvalidate(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthSize = MeasureSpec.getSize(widthMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int resultWidth; if (widthMode == MeasureSpec.EXACTLY) { resultWidth = widthSize; } else { resultWidth = (int) (56 * getResources().getDisplayMetrics().density + 0.5f) + getPaddingLeft() + getPaddingRight(); if (widthMode == MeasureSpec.AT_MOST) { resultWidth = Math.min(resultWidth, widthSize); } } int heightSize = MeasureSpec.getSize(heightMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int resultHeight; if (heightMode == MeasureSpec.EXACTLY) { resultHeight = heightSize; } else { int selfExpectedResultHeight = (int) (resultWidth * RATIO_ASPECT) + getPaddingTop() + getPaddingBottom(); resultHeight = selfExpectedResultHeight; if (heightMode == MeasureSpec.AT_MOST) { resultHeight = Math.min(resultHeight, heightSize); } } setMeasuredDimension(resultWidth, resultHeight); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = w; mHeight = h; isCanVisibleDrawing = mWidth > getPaddingLeft() + getPaddingRight() && mHeight > getPaddingTop() + getPaddingBottom(); if (isCanVisibleDrawing) { int actuallyDrawingAreaWidth = mWidth - getPaddingLeft() - getPaddingRight(); int actuallyDrawingAreaHeight = mHeight - getPaddingTop() - getPaddingBottom(); if (actuallyDrawingAreaWidth * RATIO_ASPECT < actuallyDrawingAreaHeight) { actuallyDrawingAreaLeft = getPaddingLeft(); actuallyDrawingAreaRight = mWidth - getPaddingRight(); int heightExtraSize = (int) (actuallyDrawingAreaHeight - actuallyDrawingAreaWidth * RATIO_ASPECT); actuallyDrawingAreaTop = getPaddingTop() + heightExtraSize / 2; actuallyDrawingAreaBottom = getHeight() - getPaddingBottom() - heightExtraSize / 2; } else { int widthExtraSize = (int) (actuallyDrawingAreaWidth - actuallyDrawingAreaHeight / RATIO_ASPECT); actuallyDrawingAreaLeft = getPaddingLeft() + widthExtraSize / 2; actuallyDrawingAreaRight = getWidth() - getPaddingRight() - widthExtraSize / 2; actuallyDrawingAreaTop = getPaddingTop(); actuallyDrawingAreaBottom = getHeight() - getPaddingBottom(); } shadowReservedHeight = (int) ((actuallyDrawingAreaBottom - actuallyDrawingAreaTop) * 0.09f); sLeft = actuallyDrawingAreaLeft; sTop = actuallyDrawingAreaTop + shadowReservedHeight; sRight = actuallyDrawingAreaRight; sBottom = actuallyDrawingAreaBottom - shadowReservedHeight; sWidth = sRight - sLeft; sHeight = sBottom - sTop; sCenterX = (sRight + sLeft) / 2; sCenterY = (sBottom + sTop) / 2; bLeft = sLeft; bTop = sTop; bBottom = sBottom; bWidth = sBottom - sTop; bRight = sLeft + bWidth; final float halfHeightOfS = bWidth / 2; // OfB bRadius = halfHeightOfS * 0.95f; bOffset = bRadius * 0.2f; // offset of switching bStrokeWidth = (halfHeightOfS - bRadius) * 2; bOnLeftX = sRight - bWidth; bOn2LeftX = bOnLeftX - bOffset; bOffLeftX = sLeft; bOff2LeftX = bOffLeftX + bOffset; sScale = 1 - bStrokeWidth / sHeight; sPath.reset(); RectF sRectF = new RectF(); sRectF.top = sTop; sRectF.bottom = sBottom; sRectF.left = sLeft; sRectF.right = sLeft + sHeight; sPath.arcTo(sRectF, 90, 180); sRectF.left = sRight - sHeight; sRectF.right = sRight; sPath.arcTo(sRectF, 270, 180); sPath.close(); bRectF.left = bLeft; bRectF.right = bRight; bRectF.top = bTop + bStrokeWidth / 2; bRectF.bottom = bBottom - bStrokeWidth / 2; float bCenterX = (bRight + bLeft) / 2; float bCenterY = (bBottom + bTop) / 2; shadowGradient = new RadialGradient(bCenterX, bCenterY, bRadius, 0xff000000, 0x00000000, Shader.TileMode.CLAMP); } } private void calcBPath(float percent) { bPath.reset(); bRectF.left = bLeft + bStrokeWidth / 2; bRectF.right = bRight - bStrokeWidth / 2; bPath.arcTo(bRectF, 90, 180); bRectF.left = bLeft + percent * bOffset + bStrokeWidth / 2; bRectF.right = bRight + percent * bOffset - bStrokeWidth / 2; bPath.arcTo(bRectF, 270, 180); bPath.close(); } private float calcBTranslate(float percent) { float result = 0; switch (state - lastState) { case 1: if (state == STATE_SWITCH_OFF2) { result = bOffLeftX; // off -> off2 } else if (state == STATE_SWITCH_ON) { result = bOnLeftX - (bOnLeftX - bOn2LeftX) * percent; // on2 -> on } break; case 2: if (state == STATE_SWITCH_ON) { result = bOnLeftX - (bOnLeftX - bOffLeftX) * percent; // off2 -> on } else if (state == STATE_SWITCH_ON) { result = bOn2LeftX - (bOn2LeftX - bOffLeftX) * percent; // off -> on2 } break; case 3: result = bOnLeftX - (bOnLeftX - bOffLeftX) * percent; // off -> on break; case -1: if (state == STATE_SWITCH_ON2) { result = bOn2LeftX + (bOnLeftX - bOn2LeftX) * percent; // on -> on2 } else if (state == STATE_SWITCH_OFF) { result = bOffLeftX; // off2 -> off } break; case -2: if (state == STATE_SWITCH_OFF) { result = bOffLeftX + (bOn2LeftX - bOffLeftX) * percent; // on2 -> off } else if (state == STATE_SWITCH_OFF2) { result = bOff2LeftX + (bOnLeftX - bOff2LeftX) * percent; // on -> off2 } break; case -3: result = bOffLeftX + (bOnLeftX - bOffLeftX) * percent; // on -> off break; default: // init case 0: if (state == STATE_SWITCH_OFF) { result = bOffLeftX; // off -> off } else if (state == STATE_SWITCH_ON) { result = bOnLeftX; // on -> on } break; } return result - bOffLeftX; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (!isCanVisibleDrawing) return; paint.setAntiAlias(true); final boolean isOn = (state == STATE_SWITCH_ON || state == STATE_SWITCH_ON2); // Draw background paint.setStyle(Paint.Style.FILL); paint.setColor(isOn ? colorPrimary : 0xffE3E3E3); canvas.drawPath(sPath, paint); sAnim = sAnim - ANIMATION_SPEED > 0 ? sAnim - ANIMATION_SPEED : 0; bAnim = bAnim - ANIMATION_SPEED > 0 ? bAnim - ANIMATION_SPEED : 0; final float dsAnim = interpolator.getInterpolation(sAnim); final float dbAnim = interpolator.getInterpolation(bAnim); // Draw background animation final float scale = sScale * (isOn ? dsAnim : 1 - dsAnim); final float scaleOffset = (sRight - sCenterX - bRadius) * (isOn ? 1 - dsAnim : dsAnim); canvas.save(); canvas.scale(scale, scale, sCenterX + scaleOffset, sCenterY); paint.setColor(0xFFFFFFFF); canvas.drawPath(sPath, paint); canvas.restore(); // To prepare center bar path canvas.save(); canvas.translate(calcBTranslate(dbAnim), shadowReservedHeight); final boolean isState2 = (state == STATE_SWITCH_ON2 || state == STATE_SWITCH_OFF2); calcBPath(isState2 ? 1 - dbAnim : dbAnim); // Use center bar path to draw shadow if (hasShadow) { paint.setStyle(Paint.Style.FILL); paint.setColor(0xFF333333); paint.setShader(shadowGradient); canvas.drawPath(bPath, paint); paint.setShader(null); } canvas.translate(0, -shadowReservedHeight); // draw bar canvas.scale(0.98f, 0.98f, bWidth / 2, bWidth / 2); paint.setStyle(Paint.Style.FILL); paint.setColor(0xffffffff); canvas.drawPath(bPath, paint); paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(bStrokeWidth * 0.5f); paint.setColor(isOn ? colorPrimaryDark : 0xFFBFBFBF); canvas.drawPath(bPath, paint); canvas.restore(); paint.reset(); if (sAnim > 0 || bAnim > 0) invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { if ((state == STATE_SWITCH_ON || state == STATE_SWITCH_OFF) && (sAnim * bAnim == 0)) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: return true; case MotionEvent.ACTION_UP: lastState = state; bAnim = 1; if (state == STATE_SWITCH_OFF) { refreshState(STATE_SWITCH_OFF2); listener.toggleToOn(this); } else if (state == STATE_SWITCH_ON) { refreshState(STATE_SWITCH_ON2); listener.toggleToOff(this); } if (mOnClickListener != null) { mOnClickListener.onClick(this); } break; } } return super.onTouchEvent(event); } @Override public void setOnClickListener(OnClickListener l) { super.setOnClickListener(l); mOnClickListener = l; } public interface OnStateChangedListener { void toggleToOn(SwitchView view); void toggleToOff(SwitchView view); } private OnStateChangedListener listener = new OnStateChangedListener() { @Override public void toggleToOn(SwitchView view) { toggleSwitch(true); } @Override public void toggleToOff(SwitchView view) { toggleSwitch(false); } }; public void setOnStateChangedListener(OnStateChangedListener listener) { if (listener == null) throw new IllegalArgumentException("empty listener"); this.listener = listener; } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); ss.isOpened = isOpened; return ss; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState ss = (SavedState) state; super.onRestoreInstanceState(ss.getSuperState()); this.isOpened = ss.isOpened; this.state = this.isOpened ? STATE_SWITCH_ON : STATE_SWITCH_OFF; invalidate(); } @SuppressLint("ParcelCreator") static final class SavedState extends BaseSavedState { private boolean isOpened; SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); isOpened = 1 == in.readInt(); } @Override public void writeToParcel(Parcel out, int flags) { super.writeToParcel(out, flags); out.writeInt(isOpened ? 1 : 0); } }}在资源Res:values文件夹中简历arrts资源文件：
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="SwitchView"> <attr name="hasShadow" format="boolean"/> <attr name="primaryColor" format="color"/> <attr name="primaryColorDark" format="color"/> <attr name="isOpened" format="boolean"/> </declare-styleable></resources>
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