init

libraries/wheelview/build.gradle

@@ -0,0 +1,49 @@
+apply plugin: 'com.android.library'
+apply plugin: 'maven-publish'
+//apply plugin: 'com.novoda.bintray-release'//添加插件
+
+
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        minSdkVersion 22
+        targetSdkVersion 28
+        versionCode 31
+        versionName "4.1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    lintOptions {
+        abortOnError false
+    }
+}
+
+//allprojects {
+//    tasks.withType(Javadoc) {//兼容中文字符
+//        options{
+//            encoding "UTF-8"
+//            charSet 'UTF-8'
+//            links "http://docs.oracle.com/javase/7/docs/api"
+//        }
+//    }
+//}
+//publish {
+//    userOrg = 'contrarywind'//bintray.com 用户名/组织名 user/org name
+//    groupId = 'com.contrarywind'//JCenter上显示的路径 path
+//    artifactId = 'wheelview'//项目名称 project name
+//    publishVersion = '4.1.0'//版本号 version code
+//    desc = 'this is a wheelview for android'//项目描述 description
+//    website = 'https://github.com/Bigkoo/Android-PickerView' //项目网址链接 link
+//}
+
+dependencies {
+//    compile fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.android.support:support-annotations:28.0.0'
+}

libraries/wheelview/src/androidTest/java/test/wheelview/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package test.wheelview;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("test.wheelview.test", appContext.getPackageName());
+    }
+}

libraries/wheelview/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.contrarywind.view">
+
+</manifest>

libraries/wheelview/src/main/java/com/contrarywind/adapter/WheelAdapter.java

@@ -0,0 +1,25 @@
+package com.contrarywind.adapter;
+
+
+public interface WheelAdapter<T> {
+	/**
+	 * Gets items count
+	 * @return the count of wheel items
+	 */
+	int getItemsCount();
+	
+	/**
+	 * Gets a wheel item by index.
+	 * @param index the item index
+	 * @return the wheel item text or null
+	 */
+	T getItem(int index);
+	
+	/**
+	 * Gets maximum item length. It is used to determine the wheel width.
+	 * If -1 is returned there will be used the default wheel width.
+	 * @param o  the item object
+	 * @return the maximum item length or -1
+     */
+	int indexOf(T o);
+}

libraries/wheelview/src/main/java/com/contrarywind/interfaces/IPickerViewData.java

@@ -0,0 +1,8 @@
+package com.contrarywind.interfaces;
+
+/**
+ * Created by Sai on 2016/7/13.
+ */
+public interface IPickerViewData {
+    String getPickerViewText();
+}

libraries/wheelview/src/main/java/com/contrarywind/listener/LoopViewGestureListener.java

@@ -0,0 +1,25 @@
+package com.contrarywind.listener;
+
+import android.view.MotionEvent;
+
+import com.contrarywind.view.WheelView;
+
+
+/**
+ * 手势监听
+ */
+public final class LoopViewGestureListener extends android.view.GestureDetector.SimpleOnGestureListener {
+
+    private final WheelView wheelView;
+
+
+    public LoopViewGestureListener(WheelView wheelView) {
+        this.wheelView = wheelView;
+    }
+
+    @Override
+    public final boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
+        wheelView.scrollBy(velocityY);
+        return true;
+    }
+}

libraries/wheelview/src/main/java/com/contrarywind/listener/OnItemSelectedListener.java

@@ -0,0 +1,6 @@
+package com.contrarywind.listener;
+
+
+public interface OnItemSelectedListener {
+    void onItemSelected(int index);
+}

libraries/wheelview/src/main/java/com/contrarywind/timer/InertiaTimerTask.java

@@ -0,0 +1,79 @@
+package com.contrarywind.timer;
+
+import com.contrarywind.view.WheelView;
+
+import java.util.TimerTask;
+
+/**
+ * 滚动惯性的实现
+ *
+ * @author 小嵩
+ * date:  2017-12-23 23:20:44
+ */
+public final class InertiaTimerTask extends TimerTask {
+
+    private float mCurrentVelocityY; //当前滑动速度
+    private final float mFirstVelocityY;//手指离开屏幕时的初始速度
+    private final WheelView mWheelView;
+
+    /**
+     * @param wheelView 滚轮对象
+     * @param velocityY Y轴滑行速度
+     */
+    public InertiaTimerTask(WheelView wheelView, float velocityY) {
+        super();
+        this.mWheelView = wheelView;
+        this.mFirstVelocityY = velocityY;
+        mCurrentVelocityY = Integer.MAX_VALUE;
+    }
+
+    @Override
+    public final void run() {
+
+        //防止闪动，对速度做一个限制。
+        if (mCurrentVelocityY == Integer.MAX_VALUE) {
+            if (Math.abs(mFirstVelocityY) > 2000F) {
+                mCurrentVelocityY = mFirstVelocityY > 0 ? 2000F : -2000F;
+            } else {
+                mCurrentVelocityY = mFirstVelocityY;
+            }
+        }
+
+        //发送handler消息 处理平顺停止滚动逻辑
+        if (Math.abs(mCurrentVelocityY) >= 0.0F && Math.abs(mCurrentVelocityY) <= 20F) {
+            mWheelView.cancelFuture();
+            mWheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_SMOOTH_SCROLL);
+            return;
+        }
+
+        int dy = (int) (mCurrentVelocityY / 100F);
+        mWheelView.setTotalScrollY(mWheelView.getTotalScrollY() - dy);
+        if (!mWheelView.isLoop()) {
+            float itemHeight = mWheelView.getItemHeight();
+            float top = (-mWheelView.getInitPosition()) * itemHeight;
+            float bottom = (mWheelView.getItemsCount() - 1 - mWheelView.getInitPosition()) * itemHeight;
+            if (mWheelView.getTotalScrollY() - itemHeight * 0.25 < top) {
+                top = mWheelView.getTotalScrollY() + dy;
+            } else if (mWheelView.getTotalScrollY() + itemHeight * 0.25 > bottom) {
+                bottom = mWheelView.getTotalScrollY() + dy;
+            }
+
+            if (mWheelView.getTotalScrollY() <= top) {
+                mCurrentVelocityY = 40F;
+                mWheelView.setTotalScrollY((int) top);
+            } else if (mWheelView.getTotalScrollY() >= bottom) {
+                mWheelView.setTotalScrollY((int) bottom);
+                mCurrentVelocityY = -40F;
+            }
+        }
+
+        if (mCurrentVelocityY < 0.0F) {
+            mCurrentVelocityY = mCurrentVelocityY + 20F;
+        } else {
+            mCurrentVelocityY = mCurrentVelocityY - 20F;
+        }
+
+        //刷新UI
+        mWheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_INVALIDATE_LOOP_VIEW);
+    }
+}

libraries/wheelview/src/main/java/com/contrarywind/timer/MessageHandler.java

@@ -0,0 +1,42 @@
+package com.contrarywind.timer;
+
+import android.os.Handler;
+import android.os.Message;
+
+import com.contrarywind.view.WheelView;
+
+/**
+ * Handler 消息类
+ *
+ * @author 小嵩
+ * date: 2017-12-23 23:20:44
+ */
+public final class MessageHandler extends Handler {
+    public static final int WHAT_INVALIDATE_LOOP_VIEW = 1000;
+    public static final int WHAT_SMOOTH_SCROLL = 2000;
+    public static final int WHAT_ITEM_SELECTED = 3000;
+
+    private final WheelView wheelView;
+
+    public MessageHandler(WheelView wheelView) {
+        this.wheelView = wheelView;
+    }
+
+    @Override
+    public final void handleMessage(Message msg) {
+        switch (msg.what) {
+            case WHAT_INVALIDATE_LOOP_VIEW:
+                wheelView.invalidate();
+                break;
+
+            case WHAT_SMOOTH_SCROLL:
+                wheelView.smoothScroll(WheelView.ACTION.FLING);
+                break;
+
+            case WHAT_ITEM_SELECTED:
+                wheelView.onItemSelected();
+                break;
+        }
+    }
+
+}

libraries/wheelview/src/main/java/com/contrarywind/timer/SmoothScrollTimerTask.java

@@ -0,0 +1,64 @@
+package com.contrarywind.timer;
+
+import com.contrarywind.view.WheelView;
+
+import java.util.TimerTask;
+
+/**
+ * 平滑滚动的实现
+ *
+ * @author 小嵩
+ */
+public final class SmoothScrollTimerTask extends TimerTask {
+
+    private int realTotalOffset;
+    private int realOffset;
+    private int offset;
+    private final WheelView wheelView;
+
+    public SmoothScrollTimerTask(WheelView wheelView, int offset) {
+        this.wheelView = wheelView;
+        this.offset = offset;
+        realTotalOffset = Integer.MAX_VALUE;
+        realOffset = 0;
+    }
+
+    @Override
+    public final void run() {
+        if (realTotalOffset == Integer.MAX_VALUE) {
+            realTotalOffset = offset;
+        }
+        //把要滚动的范围细分成10小份，按10小份单位来重绘
+        realOffset = (int) ((float) realTotalOffset * 0.1F);
+
+        if (realOffset == 0) {
+            if (realTotalOffset < 0) {
+                realOffset = -1;
+            } else {
+                realOffset = 1;
+            }
+        }
+
+        if (Math.abs(realTotalOffset) <= 1) {
+            wheelView.cancelFuture();
+            wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_ITEM_SELECTED);
+        } else {
+            wheelView.setTotalScrollY(wheelView.getTotalScrollY() + realOffset);
+
+            //这里如果不是循环模式，则点击空白位置需要回滚，不然就会出现选到－1 item的 情况
+            if (!wheelView.isLoop()) {
+                float itemHeight = wheelView.getItemHeight();
+                float top = (float) (-wheelView.getInitPosition()) * itemHeight;
+                float bottom = (float) (wheelView.getItemsCount() - 1 - wheelView.getInitPosition()) * itemHeight;
+                if (wheelView.getTotalScrollY() <= top || wheelView.getTotalScrollY() >= bottom) {
+                    wheelView.setTotalScrollY(wheelView.getTotalScrollY() - realOffset);
+                    wheelView.cancelFuture();
+                    wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_ITEM_SELECTED);
+                    return;
+                }
+            }
+            wheelView.getHandler().sendEmptyMessage(MessageHandler.WHAT_INVALIDATE_LOOP_VIEW);
+            realTotalOffset = realTotalOffset - realOffset;
+        }
+    }
+}

libraries/wheelview/src/main/java/com/contrarywind/view/WheelView.java

@@ -0,0 +1,840 @@
+package com.contrarywind.view;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.Typeface;
+import android.os.Handler;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.view.GestureDetector;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+
+import com.contrarywind.adapter.WheelAdapter;
+import com.contrarywind.interfaces.IPickerViewData;
+import com.contrarywind.listener.LoopViewGestureListener;
+import com.contrarywind.listener.OnItemSelectedListener;
+import com.contrarywind.timer.InertiaTimerTask;
+import com.contrarywind.timer.MessageHandler;
+import com.contrarywind.timer.SmoothScrollTimerTask;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * 3d滚轮控件
+ */
+public class WheelView extends View {
+
+    public enum ACTION { // 点击，滑翔(滑到尽头)，拖拽事件
+        CLICK, FLING, DAGGLE
+    }
+
+    public enum DividerType { // 分隔线类型
+        FILL, WRAP, CIRCLE
+    }
+
+    private static final String[] TIME_NUM = {"00", "01", "02", "03", "04", "05", "06", "07", "08", "09"};
+
+    private DividerType dividerType;//分隔线类型
+
+    private Context context;
+    private Handler handler;
+    private GestureDetector gestureDetector;
+    private OnItemSelectedListener onItemSelectedListener;
+
+    private boolean isOptions = false;
+    private boolean isCenterLabel = true;
+
+    // Timer mTimer;
+    private ScheduledExecutorService mExecutor = Executors.newSingleThreadScheduledExecutor();
+    private ScheduledFuture<?> mFuture;
+
+    private Paint paintOuterText;
+    private Paint paintCenterText;
+    private Paint paintIndicator;
+
+    private WheelAdapter adapter;
+
+    private String label;//附加单位
+    private int textSize;//选项的文字大小
+    private int maxTextWidth;
+    private int maxTextHeight;
+    private int textXOffset;
+    private float itemHeight;//每行高度
+
+
+    private Typeface typeface = Typeface.MONOSPACE;//字体样式，默认是等宽字体
+    private int textColorOut;
+    private int textColorCenter;
+    private int dividerColor;
+    private int dividerWidth;
+
+    // 条目间距倍数
+    private float lineSpacingMultiplier = 1.6F;
+    private boolean isLoop;
+
+    // 第一条线Y坐标值
+    private float firstLineY;
+    //第二条线Y坐标
+    private float secondLineY;
+    //中间label绘制的Y坐标
+    private float centerY;
+
+    //当前滚动总高度y值
+    private float totalScrollY;
+
+    //初始化默认选中项
+    private int initPosition;
+
+    //选中的Item是第几个
+    private int selectedItem;
+    private int preCurrentIndex;
+
+    // 绘制几个条目，实际上第一项和最后一项Y轴压缩成0%了，所以可见的数目实际为9
+    private int itemsVisible = 11;
+
+    private int measuredHeight;// WheelView 控件高度
+    private int measuredWidth;// WheelView 控件宽度
+
+    // 半径
+    private int radius;
+
+    private int mOffset = 0;
+    private float previousY = 0;
+    private long startTime = 0;
+
+    // 修改这个值可以改变滑行速度
+    private static final int VELOCITY_FLING = 5;
+    private int widthMeasureSpec;
+
+    private int mGravity = Gravity.CENTER;
+    private int drawCenterContentStart = 0;//中间选中文字开始绘制位置
+    private int drawOutContentStart = 0;//非中间文字开始绘制位置
+    private static final float SCALE_CONTENT = 0.8F;//非中间文字则用此控制高度，压扁形成3d错觉
+    private float CENTER_CONTENT_OFFSET;//偏移量
+
+    private boolean isAlphaGradient = false; //透明度渐变
+
+    public WheelView(Context context) {
+        this(context, null);
+    }
+
+    public WheelView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        textSize = getResources().getDimensionPixelSize(R.dimen.pickerview_textsize);//默认大小
+
+        DisplayMetrics dm = getResources().getDisplayMetrics();
+        float density = dm.density; // 屏幕密度比（0.75/1.0/1.5/2.0/3.0）
+
+        if (density < 1) {//根据密度不同进行适配
+            CENTER_CONTENT_OFFSET = 2.4F;
+        } else if (1 <= density && density < 2) {
+            CENTER_CONTENT_OFFSET = 4.0F;
+        } else if (2 <= density && density < 3) {
+            CENTER_CONTENT_OFFSET = 6.0F;
+        } else if (density >= 3) {
+            CENTER_CONTENT_OFFSET = density * 2.5F;
+        }
+
+        if (attrs != null) {
+            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.pickerview, 0, 0);
+            mGravity = a.getInt(R.styleable.pickerview_wheelview_gravity, Gravity.CENTER);
+            textColorOut = a.getColor(R.styleable.pickerview_wheelview_textColorOut, 0xFFa8a8a8);
+            textColorCenter = a.getColor(R.styleable.pickerview_wheelview_textColorCenter, 0xFF2a2a2a);
+            dividerColor = a.getColor(R.styleable.pickerview_wheelview_dividerColor, 0xFFd5d5d5);
+            dividerWidth = a.getDimensionPixelSize(R.styleable.pickerview_wheelview_dividerWidth, 2);
+            textSize = a.getDimensionPixelOffset(R.styleable.pickerview_wheelview_textSize, textSize);
+            lineSpacingMultiplier = a.getFloat(R.styleable.pickerview_wheelview_lineSpacingMultiplier, lineSpacingMultiplier);
+            a.recycle();//回收内存
+        }
+
+        judgeLineSpace();
+        initLoopView(context);
+    }
+
+    /**
+     * 判断间距是否在1.0-4.0之间
+     */
+    private void judgeLineSpace() {
+        if (lineSpacingMultiplier < 1.0f) {
+            lineSpacingMultiplier = 1.0f;
+        } else if (lineSpacingMultiplier > 4.0f) {
+            lineSpacingMultiplier = 4.0f;
+        }
+    }
+
+    private void initLoopView(Context context) {
+        this.context = context;
+        handler = new MessageHandler(this);
+        gestureDetector = new GestureDetector(context, new LoopViewGestureListener(this));
+        gestureDetector.setIsLongpressEnabled(false);
+        isLoop = true;
+
+        totalScrollY = 0;
+        initPosition = -1;
+        initPaints();
+    }
+
+    private void initPaints() {
+        paintOuterText = new Paint();
+        paintOuterText.setColor(textColorOut);
+        paintOuterText.setAntiAlias(true);
+        paintOuterText.setTypeface(typeface);
+        paintOuterText.setTextSize(textSize);
+
+        paintCenterText = new Paint();
+        paintCenterText.setColor(textColorCenter);
+        paintCenterText.setAntiAlias(true);
+        paintCenterText.setTextScaleX(1.1F);
+        paintCenterText.setTypeface(typeface);
+        paintCenterText.setTextSize(textSize);
+
+        paintIndicator = new Paint();
+        paintIndicator.setColor(dividerColor);
+        paintIndicator.setAntiAlias(true);
+
+        setLayerType(LAYER_TYPE_SOFTWARE, null);
+    }
+
+    private void reMeasure() {//重新测量
+        if (adapter == null) {
+            return;
+        }
+
+        measureTextWidthHeight();
+
+        //半圆的周长 = item高度乘以item数目-1
+        int halfCircumference = (int) (itemHeight * (itemsVisible - 1));
+        //整个圆的周长除以PI得到直径，这个直径用作控件的总高度
+        measuredHeight = (int) ((halfCircumference * 2) / Math.PI);
+        //求出半径
+        radius = (int) (halfCircumference / Math.PI);
+        //控件宽度，这里支持weight
+        measuredWidth = MeasureSpec.getSize(widthMeasureSpec);
+        //计算两条横线 和 选中项画笔的基线Y位置
+        firstLineY = (measuredHeight - itemHeight) / 2.0F;
+        secondLineY = (measuredHeight + itemHeight) / 2.0F;
+        centerY = secondLineY - (itemHeight - maxTextHeight) / 2.0f - CENTER_CONTENT_OFFSET;
+
+        //初始化显示的item的position
+        if (initPosition == -1) {
+            if (isLoop) {
+                initPosition = (adapter.getItemsCount() + 1) / 2;
+            } else {
+                initPosition = 0;
+            }
+        }
+        preCurrentIndex = initPosition;
+    }
+
+    /**
+     * 计算最大length的Text的宽高度
+     */
+    private void measureTextWidthHeight() {
+        Rect rect = new Rect();
+        for (int i = 0; i < adapter.getItemsCount(); i++) {
+            String s1 = getContentText(adapter.getItem(i));
+            paintCenterText.getTextBounds(s1, 0, s1.length(), rect);
+
+            int textWidth = rect.width();
+            if (textWidth > maxTextWidth) {
+                maxTextWidth = textWidth;
+            }
+        }
+        paintCenterText.getTextBounds("\u661F\u671F", 0, 2, rect); // 星期的字符编码（以它为标准高度）
+        maxTextHeight = rect.height() + 2;
+        itemHeight = lineSpacingMultiplier * maxTextHeight;
+    }
+
+    public void smoothScroll(ACTION action) {//平滑滚动的实现
+        cancelFuture();
+        if (action == ACTION.FLING || action == ACTION.DAGGLE) {
+            mOffset = (int) ((totalScrollY % itemHeight + itemHeight) % itemHeight);
+            if ((float) mOffset > itemHeight / 2.0F) {//如果超过Item高度的一半，滚动到下一个Item去
+                mOffset = (int) (itemHeight - (float) mOffset);
+            } else {
+                mOffset = -mOffset;
+            }
+        }
+        //停止的时候，位置有偏移，不是全部都能正确停止到中间位置的，这里把文字位置挪回中间去
+        mFuture = mExecutor.scheduleWithFixedDelay(new SmoothScrollTimerTask(this, mOffset), 0, 10, TimeUnit.MILLISECONDS);
+    }
+
+    public final void scrollBy(float velocityY) {//滚动惯性的实现
+        cancelFuture();
+        mFuture = mExecutor.scheduleWithFixedDelay(new InertiaTimerTask(this, velocityY), 0, VELOCITY_FLING, TimeUnit.MILLISECONDS);
+    }
+
+    public void cancelFuture() {
+        if (mFuture != null && !mFuture.isCancelled()) {
+            mFuture.cancel(true);
+            mFuture = null;
+        }
+    }
+
+    /**
+     * 设置是否循环滚动
+     *
+     * @param cyclic 是否循环
+     */
+    public final void setCyclic(boolean cyclic) {
+        isLoop = cyclic;
+    }
+
+    public final void setTypeface(Typeface font) {
+        typeface = font;
+        paintOuterText.setTypeface(typeface);
+        paintCenterText.setTypeface(typeface);
+    }
+
+    public final void setTextSize(float size) {
+        if (size > 0.0F) {
+            textSize = (int) (context.getResources().getDisplayMetrics().density * size);
+            paintOuterText.setTextSize(textSize);
+            paintCenterText.setTextSize(textSize);
+        }
+    }
+
+    public final void setCurrentItem(int currentItem) {
+        //不添加这句,当这个wheelView不可见时,默认都是0,会导致获取到的时间错误
+        this.selectedItem = currentItem;
+        this.initPosition = currentItem;
+        totalScrollY = 0;//回归顶部，不然重设setCurrentItem的话位置会偏移的，就会显示出不对位置的数据
+        invalidate();
+    }
+
+    public final void setOnItemSelectedListener(OnItemSelectedListener OnItemSelectedListener) {
+        this.onItemSelectedListener = OnItemSelectedListener;
+    }
+
+    public final void setAdapter(WheelAdapter adapter) {
+        this.adapter = adapter;
+        reMeasure();
+        invalidate();
+    }
+
+    public void setItemsVisibleCount(int visibleCount) {
+        if (visibleCount % 2 == 0) {
+            visibleCount += 1;
+        }
+        this.itemsVisible = visibleCount + 2; //第一条和最后一条
+    }
+
+    public void setAlphaGradient(boolean alphaGradient) {
+        isAlphaGradient = alphaGradient;
+    }
+
+    public final WheelAdapter getAdapter() {
+        return adapter;
+    }
+
+    public final int getCurrentItem() {
+        // return selectedItem;
+        if (adapter == null) {
+            return 0;
+        }
+        if (isLoop && (selectedItem < 0 || selectedItem >= adapter.getItemsCount())) {
+            return Math.max(0, Math.min(Math.abs(Math.abs(selectedItem) - adapter.getItemsCount()), adapter.getItemsCount() - 1));
+        }
+        return Math.max(0, Math.min(selectedItem, adapter.getItemsCount() - 1));
+    }
+
+    public final void onItemSelected() {
+        if (onItemSelectedListener != null) {
+            postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    onItemSelectedListener.onItemSelected(getCurrentItem());
+                }
+            }, 200L);
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (adapter == null) {
+            return;
+        }
+        //initPosition越界会造成preCurrentIndex的值不正确
+        initPosition = Math.min(Math.max(0, initPosition), adapter.getItemsCount() - 1);
+
+        //滚动的Y值高度除去每行Item的高度，得到滚动了多少个item，即change数
+        //滚动偏移值,用于记录滚动了多少个item
+        int change = (int) (totalScrollY / itemHeight);
+        // Log.d("change", "" + change);
+
+        try {
+            //滚动中实际的预选中的item(即经过了中间位置的item) ＝ 滑动前的位置 ＋ 滑动相对位置
+            preCurrentIndex = initPosition + change % adapter.getItemsCount();
+
+        } catch (ArithmeticException e) {
+            Log.e("WheelView", "出错了！adapter.getItemsCount() == 0，联动数据不匹配");
+        }
+        if (!isLoop) {//不循环的情况
+            if (preCurrentIndex < 0) {
+                preCurrentIndex = 0;
+            }
+            if (preCurrentIndex > adapter.getItemsCount() - 1) {
+                preCurrentIndex = adapter.getItemsCount() - 1;
+            }
+        } else {//循环
+            if (preCurrentIndex < 0) {//举个例子：如果总数是5，preCurrentIndex ＝ －1，那么preCurrentIndex按循环来说，其实是0的上面，也就是4的位置
+                preCurrentIndex = adapter.getItemsCount() + preCurrentIndex;
+            }
+            if (preCurrentIndex > adapter.getItemsCount() - 1) {//同理上面,自己脑补一下
+                preCurrentIndex = preCurrentIndex - adapter.getItemsCount();
+            }
+        }
+        //跟滚动流畅度有关，总滑动距离与每个item高度取余，即并不是一格格的滚动，每个item不一定滚到对应Rect里的，这个item对应格子的偏移值
+        float itemHeightOffset = (totalScrollY % itemHeight);
+
+
+        //绘制中间两条横线
+        if (dividerType == DividerType.WRAP) {//横线长度仅包裹内容
+            float startX;
+            float endX;
+
+            if (TextUtils.isEmpty(label)) {//隐藏Label的情况
+                startX = (measuredWidth - maxTextWidth) / 2 - 12;
+            } else {
+                startX = (measuredWidth - maxTextWidth) / 4 - 12;
+            }
+
+            if (startX <= 0) {//如果超过了WheelView的边缘
+                startX = 10;
+            }
+            endX = measuredWidth - startX;
+            canvas.drawLine(startX, firstLineY, endX, firstLineY, paintIndicator);
+            canvas.drawLine(startX, secondLineY, endX, secondLineY, paintIndicator);
+        } else if (dividerType == DividerType.CIRCLE) {
+            //分割线为圆圈形状
+            paintIndicator.setStyle(Paint.Style.STROKE);
+            paintIndicator.setStrokeWidth(dividerWidth);
+            float startX;
+            float endX;
+            if (TextUtils.isEmpty(label)) {//隐藏Label的情况
+                startX = (measuredWidth - maxTextWidth) / 2f - 12;
+            } else {
+                startX = (measuredWidth - maxTextWidth) / 4f - 12;
+            }
+            if (startX <= 0) {//如果超过了WheelView的边缘
+                startX = 10;
+            }
+            endX = measuredWidth - startX;
+            //半径始终以宽高中最大的来算
+            float radius = Math.max((endX - startX), itemHeight) / 1.8f;
+            canvas.drawCircle(measuredWidth / 2f, measuredHeight / 2f, radius, paintIndicator);
+        } else {
+            canvas.drawLine(0.0F, firstLineY, measuredWidth, firstLineY, paintIndicator);
+            canvas.drawLine(0.0F, secondLineY, measuredWidth, secondLineY, paintIndicator);
+        }
+
+        //只显示选中项Label文字的模式，并且Label文字不为空，则进行绘制
+        if (!TextUtils.isEmpty(label) && isCenterLabel) {
+            //绘制文字，靠右并留出空隙
+            int drawRightContentStart = measuredWidth - getTextWidth(paintCenterText, label);
+            canvas.drawText(label, drawRightContentStart - CENTER_CONTENT_OFFSET, centerY, paintCenterText);
+        }
+
+        // 设置数组中每个元素的值
+        int counter = 0;
+        while (counter < itemsVisible) {
+            Object showText;
+            int index = preCurrentIndex - (itemsVisible / 2 - counter);//索引值，即当前在控件中间的item看作数据源的中间，计算出相对源数据源的index值
+
+            //判断是否循环，如果是循环数据源也使用相对循环的position获取对应的item值，如果不是循环则超出数据源范围使用""空白字符串填充，在界面上形成空白无数据的item项
+            if (isLoop) {
+                index = getLoopMappingIndex(index);
+                showText = adapter.getItem(index);
+            } else if (index < 0) {
+                showText = "";
+            } else if (index > adapter.getItemsCount() - 1) {
+                showText = "";
+            } else {
+                showText = adapter.getItem(index);
+            }
+
+            canvas.save();
+            // 弧长 L = itemHeight * counter - itemHeightOffset
+            // 求弧度 α = L / r  (弧长/半径) [0,π]
+            double radian = ((itemHeight * counter - itemHeightOffset)) / radius;
+            // 弧度转换成角度(把半圆以Y轴为轴心向右转90度，使其处于第一象限及第四象限
+            // angle [-90°,90°]
+            float angle = (float) (90D - (radian / Math.PI) * 180D);//item第一项,从90度开始，逐渐递减到 -90度
+
+            // 计算取值可能有细微偏差，保证负90°到90°以外的不绘制
+            if (angle > 90F || angle < -90F) {
+                canvas.restore();
+            } else {
+                //获取内容文字
+                String contentText;
+
+                //如果是label每项都显示的模式，并且item内容不为空、label 也不为空
+                if (!isCenterLabel && !TextUtils.isEmpty(label) && !TextUtils.isEmpty(getContentText(showText))) {
+                    contentText = getContentText(showText) + label;
+                } else {
+                    contentText = getContentText(showText);
+                }
+                // 根据当前角度计算出偏差系数，用以在绘制时控制文字的 水平移动 透明度 倾斜程度.
+                float offsetCoefficient = (float) Math.pow(Math.abs(angle) / 90f, 2.2);
+
+                reMeasureTextSize(contentText);
+                //计算开始绘制的位置
+                measuredCenterContentStart(contentText);
+                measuredOutContentStart(contentText);
+                float translateY = (float) (radius - Math.cos(radian) * radius - (Math.sin(radian) * maxTextHeight) / 2D);
+                //根据Math.sin(radian)来更改canvas坐标系原点，然后缩放画布，使得文字高度进行缩放，形成弧形3d视觉差
+                canvas.translate(0.0F, translateY);
+                if (translateY <= firstLineY && maxTextHeight + translateY >= firstLineY) {
+                    // 条目经过第一条线
+                    canvas.save();
+                    canvas.clipRect(0, 0, measuredWidth, firstLineY - translateY);
+                    canvas.scale(1.0F, (float) Math.sin(radian) * SCALE_CONTENT);
+                    setOutPaintStyle(offsetCoefficient, angle);
+                    canvas.drawText(contentText, drawOutContentStart, maxTextHeight, paintOuterText);
+                    canvas.restore();
+                    canvas.save();
+                    canvas.clipRect(0, firstLineY - translateY, measuredWidth, (int) (itemHeight));
+                    canvas.scale(1.0F, (float) Math.sin(radian) * 1.0F);
+                    canvas.drawText(contentText, drawCenterContentStart, maxTextHeight - CENTER_CONTENT_OFFSET, paintCenterText);
+                    canvas.restore();
+                } else if (translateY <= secondLineY && maxTextHeight + translateY >= secondLineY) {
+                    // 条目经过第二条线
+                    canvas.save();
+                    canvas.clipRect(0, 0, measuredWidth, secondLineY - translateY);
+                    canvas.scale(1.0F, (float) Math.sin(radian) * 1.0F);
+                    canvas.drawText(contentText, drawCenterContentStart, maxTextHeight - CENTER_CONTENT_OFFSET, paintCenterText);
+                    canvas.restore();
+                    canvas.save();
+                    canvas.clipRect(0, secondLineY - translateY, measuredWidth, (int) (itemHeight));
+                    canvas.scale(1.0F, (float) Math.sin(radian) * SCALE_CONTENT);
+                    setOutPaintStyle(offsetCoefficient, angle);
+                    canvas.drawText(contentText, drawOutContentStart, maxTextHeight, paintOuterText);
+                    canvas.restore();
+                } else if (translateY >= firstLineY && maxTextHeight + translateY <= secondLineY) {
+                    // 中间条目
+                    // canvas.clipRect(0, 0, measuredWidth, maxTextHeight);
+                    //让文字居中
+                    float Y = maxTextHeight - CENTER_CONTENT_OFFSET;//因为圆弧角换算的向下取值，导致角度稍微有点偏差，加上画笔的基线会偏上，因此需要偏移量修正一下
+                    canvas.drawText(contentText, drawCenterContentStart, Y, paintCenterText);
+                    //设置选中项
+                    selectedItem = preCurrentIndex - (itemsVisible / 2 - counter);
+                } else {
+                    // 其他条目
+                    canvas.save();
+                    canvas.clipRect(0, 0, measuredWidth, (int) (itemHeight));
+                    canvas.scale(1.0F, (float) Math.sin(radian) * SCALE_CONTENT);
+                    setOutPaintStyle(offsetCoefficient, angle);
+                    // 控制文字水平偏移距离
+                    canvas.drawText(contentText, drawOutContentStart + textXOffset * offsetCoefficient, maxTextHeight, paintOuterText);
+                    canvas.restore();
+                }
+                canvas.restore();
+                paintCenterText.setTextSize(textSize);
+            }
+            counter++;
+        }
+    }
+
+    //设置文字倾斜角度，透明度
+    private void setOutPaintStyle(float offsetCoefficient, float angle) {
+        // 控制文字倾斜角度
+        float DEFAULT_TEXT_TARGET_SKEW_X = 0.5f;
+        int multiplier = 0;
+        if (textXOffset > 0) {
+            multiplier = 1;
+        } else if (textXOffset < 0) {
+            multiplier = -1;
+        }
+        paintOuterText.setTextSkewX(multiplier * (angle > 0 ? -1 : 1) * DEFAULT_TEXT_TARGET_SKEW_X * offsetCoefficient);
+
+        // 控制透明度
+        int alpha = isAlphaGradient ? (int) ((90F - Math.abs(angle)) / 90f * 255) : 255;
+        // Log.d("WheelView", "alpha:" + alpha);
+        paintOuterText.setAlpha(alpha);
+    }
+
+    /**
+     * reset the size of the text Let it can fully display
+     *
+     * @param contentText item text content.
+     */
+    private void reMeasureTextSize(String contentText) {
+        Rect rect = new Rect();
+        paintCenterText.getTextBounds(contentText, 0, contentText.length(), rect);
+        int width = rect.width();
+        int size = textSize;
+        while (width > measuredWidth) {
+            size--;
+            //设置2条横线中间的文字大小
+            paintCenterText.setTextSize(size);
+            paintCenterText.getTextBounds(contentText, 0, contentText.length(), rect);
+            width = rect.width();
+        }
+        //设置2条横线外面的文字大小
+        paintOuterText.setTextSize(size);
+    }
+
+
+    //递归计算出对应的index
+    private int getLoopMappingIndex(int index) {
+        if (index < 0) {
+            index = index + adapter.getItemsCount();
+            index = getLoopMappingIndex(index);
+        } else if (index > adapter.getItemsCount() - 1) {
+            index = index - adapter.getItemsCount();
+            index = getLoopMappingIndex(index);
+        }
+        return index;
+    }
+
+    /**
+     * 获取所显示的数据源
+     *
+     * @param item data resource
+     * @return 对应显示的字符串
+     */
+    private String getContentText(Object item) {
+        if (item == null) {
+            return "";
+        } else if (item instanceof IPickerViewData) {
+            return ((IPickerViewData) item).getPickerViewText();
+        } else if (item instanceof Integer) {
+            //如果为整形则最少保留两位数.
+            return getFixNum((int) item);
+        }
+        return item.toString();
+    }
+
+    private String getFixNum(int timeNum) {
+        return timeNum >= 0 && timeNum < 10 ? TIME_NUM[timeNum] : String.valueOf(timeNum);
+    }
+
+    private void measuredCenterContentStart(String content) {
+        Rect rect = new Rect();
+        paintCenterText.getTextBounds(content, 0, content.length(), rect);
+        switch (mGravity) {
+            case Gravity.CENTER://显示内容居中
+                if (isOptions || label == null || label.equals("") || !isCenterLabel) {
+                    drawCenterContentStart = (int) ((measuredWidth - rect.width()) * 0.5);
+                } else {//只显示中间label时，时间选择器内容偏左一点，留出空间绘制单位标签
+                    drawCenterContentStart = (int) ((measuredWidth - rect.width()) * 0.25);
+                }
+                break;
+            case Gravity.LEFT:
+                drawCenterContentStart = 0;
+                break;
+            case Gravity.RIGHT://添加偏移量
+                drawCenterContentStart = measuredWidth - rect.width() - (int) CENTER_CONTENT_OFFSET;
+                break;
+        }
+    }
+
+    private void measuredOutContentStart(String content) {
+        Rect rect = new Rect();
+        paintOuterText.getTextBounds(content, 0, content.length(), rect);
+        switch (mGravity) {
+            case Gravity.CENTER:
+                if (isOptions || label == null || label.equals("") || !isCenterLabel) {
+                    drawOutContentStart = (int) ((measuredWidth - rect.width()) * 0.5);
+                } else {//只显示中间label时，时间选择器内容偏左一点，留出空间绘制单位标签
+                    drawOutContentStart = (int) ((measuredWidth - rect.width()) * 0.25);
+                }
+                break;
+            case Gravity.LEFT:
+                drawOutContentStart = 0;
+                break;
+            case Gravity.RIGHT:
+                drawOutContentStart = measuredWidth - rect.width() - (int) CENTER_CONTENT_OFFSET;
+                break;
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        this.widthMeasureSpec = widthMeasureSpec;
+        reMeasure();
+        setMeasuredDimension(measuredWidth, measuredHeight);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        boolean eventConsumed = gestureDetector.onTouchEvent(event);
+        boolean isIgnore = false;//超过边界滑动时，不再绘制UI。
+
+        float top = -initPosition * itemHeight;
+        float bottom = (adapter.getItemsCount() - 1 - initPosition) * itemHeight;
+        float ratio = 0.25f;
+
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                startTime = System.currentTimeMillis();
+                cancelFuture();
+                previousY = event.getRawY();
+                break;
+
+            case MotionEvent.ACTION_MOVE:
+                float dy = previousY - event.getRawY();
+                previousY = event.getRawY();
+                totalScrollY = totalScrollY + dy;
+
+                // normal mode。
+                if (!isLoop) {
+                    if ((totalScrollY - itemHeight * ratio < top && dy < 0)
+                            || (totalScrollY + itemHeight * ratio > bottom && dy > 0)) {
+                        //快滑动到边界了，设置已滑动到边界的标志
+                        totalScrollY -= dy;
+                        isIgnore = true;
+                    } else {
+                        isIgnore = false;
+                    }
+                }
+                break;
+
+            case MotionEvent.ACTION_UP:
+            default:
+                if (!eventConsumed) {//未消费掉事件
+
+                    /**
+                     *@describe <关于弧长的计算>
+                     *
+                     * 弧长公式： L = α*R
+                     * 反余弦公式：arccos(cosα) = α
+                     * 由于之前是有顺时针偏移90度，
+                     * 所以实际弧度范围α2的值 ：α2 = π/2-α    （α=[0,π] α2 = [-π/2,π/2]）
+                     * 根据正弦余弦转换公式 cosα = sin(π/2-α)
+                     * 代入，得： cosα = sin(π/2-α) = sinα2 = (R - y) / R
+                     * 所以弧长 L = arccos(cosα)*R = arccos((R - y) / R)*R
+                     */
+
+                    float y = event.getY();
+                    double L = Math.acos((radius - y) / radius) * radius;
+                    //item0 有一半是在不可见区域，所以需要加上 itemHeight / 2
+                    int circlePosition = (int) ((L + itemHeight / 2) / itemHeight);
+                    float extraOffset = (totalScrollY % itemHeight + itemHeight) % itemHeight;
+                    //已滑动的弧长值
+                    mOffset = (int) ((circlePosition - itemsVisible / 2) * itemHeight - extraOffset);
+
+                    if ((System.currentTimeMillis() - startTime) > 120) {
+                        // 处理拖拽事件
+                        smoothScroll(ACTION.DAGGLE);
+                    } else {
+                        // 处理条目点击事件
+                        smoothScroll(ACTION.CLICK);
+                    }
+                }
+                break;
+        }
+        if (!isIgnore && event.getAction() != MotionEvent.ACTION_DOWN) {
+            invalidate();
+        }
+        return true;
+    }
+
+    public int getItemsCount() {
+        return adapter != null ? adapter.getItemsCount() : 0;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
+
+    public void isCenterLabel(boolean isCenterLabel) {
+        this.isCenterLabel = isCenterLabel;
+    }
+
+    public void setGravity(int gravity) {
+        this.mGravity = gravity;
+    }
+
+    public int getTextWidth(Paint paint, String str) { //calculate text width
+        int iRet = 0;
+        if (str != null && str.length() > 0) {
+            int len = str.length();
+            float[] widths = new float[len];
+            paint.getTextWidths(str, widths);
+            for (int j = 0; j < len; j++) {
+                iRet += (int) Math.ceil(widths[j]);
+            }
+        }
+        return iRet;
+    }
+
+    public void setIsOptions(boolean options) {
+        isOptions = options;
+    }
+
+    public void setTextColorOut(int textColorOut) {
+
+        this.textColorOut = textColorOut;
+        paintOuterText.setColor(this.textColorOut);
+    }
+
+    public void setTextColorCenter(int textColorCenter) {
+        this.textColorCenter = textColorCenter;
+        paintCenterText.setColor(this.textColorCenter);
+    }
+
+    public void setTextXOffset(int textXOffset) {
+        this.textXOffset = textXOffset;
+        if (textXOffset != 0) {
+            paintCenterText.setTextScaleX(1.0f);
+        }
+    }
+
+    public void setDividerWidth(int dividerWidth) {
+        this.dividerWidth = dividerWidth;
+        paintIndicator.setStrokeWidth(dividerWidth);
+    }
+
+    public void setDividerColor(int dividerColor) {
+        this.dividerColor = dividerColor;
+        paintIndicator.setColor(dividerColor);
+    }
+
+    public void setDividerType(DividerType dividerType) {
+        this.dividerType = dividerType;
+    }
+
+    public void setLineSpacingMultiplier(float lineSpacingMultiplier) {
+        if (lineSpacingMultiplier != 0) {
+            this.lineSpacingMultiplier = lineSpacingMultiplier;
+            judgeLineSpace();
+        }
+    }
+
+    public boolean isLoop() {
+        return isLoop;
+    }
+
+    public float getTotalScrollY() {
+        return totalScrollY;
+    }
+
+    public void setTotalScrollY(float totalScrollY) {
+        this.totalScrollY = totalScrollY;
+    }
+
+    public float getItemHeight() {
+        return itemHeight;
+    }
+
+    public int getInitPosition() {
+        return initPosition;
+    }
+
+    @Override
+    public Handler getHandler() {
+        return handler;
+    }
+}

libraries/wheelview/src/main/res/values/attrs.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="pickerview">
+        <attr name="wheelview_gravity">
+            <enum name="center" value="17"/>
+            <enum name="left" value="3"/>
+            <enum name="right" value="5"/>
+        </attr>
+        <attr name="wheelview_textSize" format="dimension"/>
+        <attr name="wheelview_textColorOut" format="color"/>
+        <attr name="wheelview_textColorCenter" format="color"/>
+        <attr name="wheelview_dividerColor" format="color"/>
+        <attr name="wheelview_dividerWidth" format="dimension"/>
+        <attr name="wheelview_lineSpacingMultiplier" format="float"/>
+    </declare-styleable>
+</resources>

libraries/wheelview/src/main/res/values/colors.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="pickerview_timebtn_nor">#057dff</color>
+    <color name="pickerview_timebtn_pre">#c2daf5</color>
+    <color name="pickerview_bg_topbar">#f5f5f5</color>
+
+    <color name="pickerview_topbar_title">#000000</color>
+    <color name="pickerview_wheelview_textcolor_out">#a8a8a8</color>
+    <color name="pickerview_wheelview_textcolor_center">#2a2a2a</color>
+    <color name="pickerview_wheelview_textcolor_divider">#d5d5d5</color>
+    <color name="pickerview_bgColor_overlay">#60000000</color>
+    <color name="pickerview_bgColor_default">#FFFFFFFF</color>
+
+</resources>

libraries/wheelview/src/main/res/values/dimens.xml

@@ -0,0 +1,13 @@
+<resources>
+    <!-- 顶部按钮栏高度 -->
+    <dimen name="pickerview_topbar_height">44dp</dimen>
+
+    <!-- 顶部按钮padding -->
+    <dimen name="pickerview_topbar_padding">20dp</dimen>
+
+    <!-- 顶部按钮文字大小 -->
+    <dimen name="pickerview_topbar_btn_textsize">17sp</dimen>
+    <dimen name="pickerview_topbar_title_textsize">18sp</dimen>
+    <!-- 选项文字大小 -->
+    <dimen name="pickerview_textsize">20sp</dimen>
+</resources>

libraries/wheelview/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">wheelview</string>
+</resources>