package com.leaking.slideswitch;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.os.Handler;import android.os.Looper;import android.os.Message;import android.support.v4.view.MotionEventCompat;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import com.example.slideswitch.R;public class SlideSwitch extends View {public static final int SHAPE_RECT = 1;public static final int SHAPE_CIRCLE = 2;private static final int RIM_SIZE = 6;private static final int COLOR_THEME = Color.parseColor("#ff00ee00");// 3 attributesprivate int color_theme;private boolean isOpen;private int shape;// varials of drawingprivate Paint paint;private Rect backRect;private Rect frontRect;private int alpha;private int max_left;private int min_left;private int frontRect_left;private int frontRect_left_begin = RIM_SIZE;private int eventStartX;private int eventLastX;private int diffX = 0;private SlideListener listener;public interface SlideListener {public void open();public void close();}public SlideSwitch(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);listener = null;paint = new Paint();paint.setAntiAlias(true);TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.slideswitch);color_theme = a.getColor(R.styleable.slideswitch_themeColor,COLOR_THEME);isOpen = a.getBoolean(R.styleable.slideswitch_isOpen, false);shape = a.getInt(R.styleable.slideswitch_shape, SHAPE_RECT);a.recycle();}public SlideSwitch(Context context, AttributeSet attrs) {this(context, attrs, 0);}public SlideSwitch(Context context) {this(context, null);}}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int width = measureDimension(280, widthMeasureSpec);int height = measureDimension(140, heightMeasureSpec);if (shape == SHAPE_CIRCLE) {if (width < height)width = height * 2;}setMeasuredDimension(width, height);initDrawingVal();}public void initDrawingVal(){int width = getMeasuredWidth();int height = getMeasuredHeight();backRect = new Rect(0, 0, width, height);min_left = RIM_SIZE;if (shape == SHAPE_RECT)max_left = width / 2;elsemax_left = width – (height – 2 * RIM_SIZE) – RIM_SIZE;if (isOpen) {frontRect_left = max_left;alpha = 255;} else {frontRect_left = RIM_SIZE;alpha = 0;}frontRect_left_begin = frontRect_left;}public int measureDimension(int defaultSize, int measureSpec) {int result;int specMode = MeasureSpec.getMode(measureSpec);int specSize = MeasureSpec.getSize(measureSpec);if (specMode == MeasureSpec.EXACTLY) {result = specSize;} else {result = defaultSize; // UNSPECIFIEDif (specMode == MeasureSpec.AT_MOST) {result = Math.min(result, specSize);}}return result;}@Overrideprotected void onDraw(Canvas canvas) {if (shape == SHAPE_RECT) {paint.setColor(Color.GRAY);canvas.drawRect(backRect, paint);paint.setColor(color_theme);paint.setAlpha(alpha);canvas.drawRect(backRect, paint);frontRect = new Rect(frontRect_left, RIM_SIZE, frontRect_left+ getMeasuredWidth() / 2 – RIM_SIZE, getMeasuredHeight()- RIM_SIZE);paint.setColor(Color.WHITE);canvas.drawRect(frontRect, paint);} else {// 画圆形int radius;radius = backRect.height() / 2 – RIM_SIZE;paint.setColor(Color.GRAY);canvas.drawRoundRect(new RectF(backRect), radius, radius, paint);paint.setColor(color_theme);paint.setAlpha(alpha);canvas.drawRoundRect(new RectF(backRect), radius, radius, paint);frontRect = new Rect(frontRect_left, RIM_SIZE, frontRect_left+ backRect.height() – 2 * RIM_SIZE, backRect.height()- RIM_SIZE);paint.setColor(Color.WHITE);canvas.drawRoundRect(new RectF(frontRect), radius, radius, paint);}}@Overridepublic boolean onTouchEvent(MotionEvent event) {int action = MotionEventCompat.getActionMasked(event);switch (action) {case MotionEvent.ACTION_DOWN:eventStartX = (int) event.getRawX();break;case MotionEvent.ACTION_MOVE:eventLastX = (int) event.getRawX();diffX = eventLastX – eventStartX;int tempX = diffX + frontRect_left_begin;tempX = (tempX > max_left ? max_left : tempX);tempX = (tempX < min_left ? min_left : tempX);if (tempX >= min_left && tempX <= max_left) {frontRect_left = tempX;alpha = (int) (255 * (float) tempX / (float) max_left);invalidateView();}break;case MotionEvent.ACTION_UP:int wholeX = (int) (event.getRawX() – eventStartX);frontRect_left_begin = frontRect_left;boolean toRight;toRight = (frontRect_left_begin > max_left / 2 ? true : false);if (Math.abs(wholeX) < 3) {toRight = !toRight;}moveToDest(toRight);break;default:break;}return true;}/** * draw again */private void invalidateView() {if (Looper.getMainLooper() == Looper.myLooper()) {invalidate();} else {postInvalidate();}}public void setSlideListener(SlideListener listener) {this.listener = listener;}public void moveToDest(final boolean toRight) {final Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {if (msg.what == 1) {listener.open();} else {listener.close();}}};new Thread(new Runnable() {@Overridepublic void run() {if (toRight) {while (frontRect_left <= max_left) {alpha = (int) (255 * (float) frontRect_left / (float) max_left);invalidateView();frontRect_left += 3;try {Thread.sleep(3);} catch (InterruptedException e) {e.printStackTrace();}}alpha = 255;frontRect_left = max_left;isOpen = true;if (listener != null)handler.sendEmptyMessage(1);frontRect_left_begin = max_left;} else {while (frontRect_left >= min_left) {alpha = (int) (255 * (float) frontRect_left / (float) max_left);invalidateView();frontRect_left -= 3;try {Thread.sleep(3);} catch (InterruptedException e) {e.printStackTrace();}}alpha = 0;frontRect_left = min_left;isOpen = false;if (listener != null)handler.sendEmptyMessage(0);frontRect_left_begin = min_left;}}}).start();}public void setState(boolean isOpen) {this.isOpen = isOpen;initDrawingVal();invalidateView();if(listener != null)if(isOpen == true){listener.open();}else{listener.close();}}public void setShapeType(int shapeType) {this.shape = shapeType;}}
，当明知不可挽回，唯一补偿的方法就是怀念，
