iOSカスタム時間スクロール選択コントロール


この例では、iOSのカスタム時間スクロール選択コントロールの具体的なコードを共有します。
1.まずユーザー定義のコントロールをオンにします。

/**
 *      
 * author LH
 * data 2016/8/20 17:26
 */
public class WheelView extends View {
 
 public static final String TAG = "WheelView";
 
 /**
 *           
 */
 public static final float SPEED = 2;
 
 /**
 *    item ,             
 */
 public static final int SHOW_SIZE = 1;
 
 private Context context;
 
 private List<String> itemList;
 private int itemCount;
 
 /**
 * item  
 */
 private int itemHeight = 50;
 
 /**
 *      ,     mDataList     ,    
 */
 private int currentItem;
 
 private Paint selectPaint;
 private Paint mPaint;
 //           
 private Paint centerLinePaint;
 
 private float centerY;
 private float centerX;
 
 private float mLastDownY;
 /**
 *      
 */
 private float mMoveLen = 0;
 private boolean isInit = false;
 private SelectListener mSelectListener;
 private Timer timer;
 private MyTimerTask mTask;
 
 Handler updateHandler = new Handler() {
 
 @Override
 public void handleMessage(Message msg) {
  if (Math.abs(mMoveLen) < SPEED) {
  //             
  mMoveLen = 0;
  if (null != timer) {
   timer.cancel();
   timer.purge();
   timer = null;
  }
  if (mTask != null) {
   mTask.cancel();
   mTask = null;
   performSelect();
  }
  } else {
  //   mMoveLen / Math.abs(mMoveLen)     mMoveLen    ,        
  mMoveLen = mMoveLen - mMoveLen / Math.abs(mMoveLen) * SPEED;
  }
  invalidate();
 }
 
 };
 
 public WheelView(Context context) {
 super(context);
 init(context);
 }
 
 public WheelView(Context context, AttributeSet attrs) {
 super(context, attrs);
 init(context);
 }
 
 public void setOnSelectListener(SelectListener listener) {
 mSelectListener = listener;
 }
 
 public void setWheelStyle(int style) {
 itemList = WheelStyle.getItemList(context, style);
 if (itemList != null) {
  itemCount = itemList.size();
  resetCurrentSelect();
  invalidate();
 } else {
  Log.i(TAG, "item is null");
 }
 }
 
 public void setWheelItemList(List<String> itemList) {
 this.itemList = itemList;
 if (itemList != null) {
  itemCount = itemList.size();
  resetCurrentSelect();
 } else {
  Log.i(TAG, "item is null");
 }
 }
 
 private void resetCurrentSelect() {
 if (currentItem < 0) {
  currentItem = 0;
 }
 while (currentItem >= itemCount) {
  currentItem--;
 }
 if (currentItem >= 0 && currentItem < itemCount) {
  invalidate();
 } else {
  Log.i(TAG, "current item is invalid");
 }
 }
 
 public int getItemCount() {
 return itemCount;
 }
 /**
 *      item index
 * author LH
 * data 2016/9/4 11:09
 */
 public void setCurrentItem(int selected) {
 currentItem = selected;
 resetCurrentSelect();
 }
 
 public int getCurrentItem() {
 return currentItem;
 }
 
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 int mViewHeight = getMeasuredHeight();
 int mViewWidth = getMeasuredWidth();
 centerX = (float) (mViewWidth / 2.0);
 centerY = (float) (mViewHeight / 2.0);
 
 isInit = true;
 invalidate();
 }
 
 
 private void init(Context context) {
 this.context = context;
 
 timer = new Timer();
 itemList = new ArrayList<>();
 
 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 mPaint.setStyle(Style.FILL);
 mPaint.setTextAlign(Align.CENTER);
 mPaint.setColor(getResources().getColor(R.color.wheel_unselect_text));
 int size1 = (int) (SupportDisplay.getLayoutScale()*22+0.5);
 mPaint.setTextSize(size1);
 
 selectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 selectPaint.setStyle(Style.FILL);
 selectPaint.setTextAlign(Align.CENTER);
 selectPaint.setColor(getResources().getColor(R.color.color_1a1a1a));
 int size2 = (int) (SupportDisplay.getLayoutScale()*24+0.5);
 selectPaint.setTextSize(size2);
 
 centerLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 centerLinePaint.setStyle(Style.FILL);
 centerLinePaint.setTextAlign(Align.CENTER);
 centerLinePaint.setColor(getResources().getColor(R.color.wheel_unselect_text));
 
 //     
 setBackground(null);
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 if (isInit) {
  drawData(canvas);
 }
 }
 
 private void drawData(Canvas canvas) {
 //       text          text
 if (!itemList.isEmpty()) {
  //     data
  drawCenterText(canvas);
  //     data
  for (int i = 1; i < SHOW_SIZE + 1; i++) {
  drawOtherText(canvas, i, -1);
  }
  //     data
  for (int i = 1; i < SHOW_SIZE + 1; i++) {
  drawOtherText(canvas, i, 1);
  }
 }
 }
 
 private void drawCenterText(Canvas canvas) {
 // text    ,  baseline         ,y  text    
 float y = centerY + mMoveLen;
 FontMetricsInt fmi = selectPaint.getFontMetricsInt();
 float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
 canvas.drawText(itemList.get(currentItem), centerX, baseline, selectPaint);
 }
 
 /**
 *     
 * author LH
 * data 2016/9/4 11:10
 * @param canvas   
 * @param position   mCurrentSelected   
 * @param type 1      ,-1      
 */
 private void drawOtherText(Canvas canvas, int position, int type) {
 int index = currentItem + type * position;
 if (index >= itemCount) {
  index = index - itemCount;
 }
 if (index < 0) {
  index = index + itemCount;
 }
 String text = itemList.get(index);
 
 int itemHeight = getHeight() / (SHOW_SIZE * 2 + 1);
 float d = itemHeight * position + type * mMoveLen;
 float y = centerY + type * d;
 
 FontMetricsInt fmi = mPaint.getFontMetricsInt();
 float baseline = (float) (y - (fmi.bottom / 2.0 + fmi.top / 2.0));
 canvas.drawText(text, centerX, baseline, mPaint);
 }
 
 @Override
 public void setBackground(Drawable background) {
 background = new Drawable() {
  @Override
  public void draw(Canvas canvas) {
  itemHeight = getHeight() / (SHOW_SIZE * 2 + 1);
  int width = getWidth();
 
  canvas.drawLine(0, itemHeight, width, itemHeight, centerLinePaint);
  canvas.drawLine(0, itemHeight * 2, width, itemHeight * 2, centerLinePaint);
 
  centerLinePaint.setColor(getResources().getColor(R.color.wheel_bg));
  Rect topRect = new Rect(0, 0, width, itemHeight);
  canvas.drawRect(topRect, centerLinePaint);
  Rect bottomRect = new Rect(0, itemHeight * 2, width, itemHeight * 3);
  canvas.drawRect(bottomRect, centerLinePaint);
  }
 
  @Override
  public void setAlpha(int alpha) {
 
  }
 
  @Override
  public void setColorFilter(ColorFilter cf) {
 
  }
 
  @Override
  public int getOpacity() {
  return 0;
  }
 };
 super.setBackground(background);
 }
 
 @Override
 public boolean onTouchEvent(MotionEvent event) {
 switch (event.getActionMasked()) {
  case MotionEvent.ACTION_DOWN:
  doDown(event);
  break;
  case MotionEvent.ACTION_MOVE:
  doMove(event);
  break;
  case MotionEvent.ACTION_UP:
  doUp();
  break;
  default:
  break;
 }
 return true;
 }
 
 private void doDown(MotionEvent event) {
 if (mTask != null) {
  mTask.cancel();
  mTask = null;
 }
 mLastDownY = event.getY();
 }
 
 private void doMove(MotionEvent event) {
 
 mMoveLen += (event.getY() - mLastDownY);
 if (mMoveLen > itemHeight / 2) {
  //          
  mMoveLen = mMoveLen - itemHeight;
  currentItem--;
  if (currentItem < 0) {
  currentItem = itemCount - 1;
  }
 } else if (mMoveLen < -itemHeight / 2) {
  //          
  mMoveLen = mMoveLen + itemHeight;
  currentItem++;
  if (currentItem >= itemCount) {
  currentItem = 0;
  }
 }
 
 mLastDownY = event.getY();
 invalidate();
 }
 
 private void doUp() {
 //     mCurrentSelected        move       
 if (Math.abs(mMoveLen) < 0.0001) {
  mMoveLen = 0;
  return;
 }
 if (mTask != null) {
  mTask.cancel();
  mTask = null;
 }
 if (null == timer) {
  timer = new Timer();
 }
 mTask = new MyTimerTask(updateHandler);
 timer.schedule(mTask, 0, 10);
 }
 
 class MyTimerTask extends TimerTask {
 Handler handler;
 
 public MyTimerTask(Handler handler) {
  this.handler = handler;
 }
 
 @Override
 public void run() {
  handler.sendMessage(handler.obtainMessage());
 }
 
 }
 
 private void performSelect() {
 if (mSelectListener != null) {
  mSelectListener.onSelect(currentItem, itemList.get(currentItem));
 } else {
  Log.i(TAG, "null listener");
 }
 }
 
 public interface SelectListener {
 void onSelect(int index, String text);
 }
 
}
2.そして時間選択コントロールのスタイルツール類

/**
 *       
 * author LH
 * data 2016/9/4 11:05
 */
public class WheelStyle {
 
 public static final int minYear = 1980;
 public static final int maxYear = 2020;
 
 /**
 * Wheel Style Hour
 */
 public static final int STYLE_HOUR = 1;
 /**
 * Wheel Style Minute
 */
 public static final int STYLE_MINUTE = 2;
 /**
 * Wheel Style Year
 */
 public static final int STYLE_YEAR = 3;
 /**
 * Wheel Style Month
 */
 public static final int STYLE_MONTH = 4;
 /**
 * Wheel Style Day
 */
 public static final int STYLE_DAY = 5;
 /**
 * Wheel Style Simple Day
 */
 public static final int STYLE_SIMPLE_DAY = 6;
 /**
 * Wheel Style Set Warn
 */
 public static final int STYLE_SET_WARN = 7;
 /**
 * Wheel Style Work Answer
 */
 public static final int STYLE_WORK_ANSWER = 8;
 
 private WheelStyle() {
 }
 
 public static List<String> getItemList(Context context, int Style) {
 if (Style == STYLE_HOUR) {
  return createHourString();
 } else if (Style == STYLE_MINUTE) {
  return createMinuteString();
 } else if (Style == STYLE_YEAR) {
  return createYearString();
 } else if (Style == STYLE_MONTH) {
  return createMonthString();
 } else if (Style == STYLE_DAY) {
  return createDayString();
 } else if (Style == STYLE_SIMPLE_DAY) {
  return createSimpleDayString();
 } else if (Style == STYLE_SET_WARN) {
  return createSetWarnTimeString();
 } else {
  throw new IllegalArgumentException("style is illegal");
 }
 }
 
 private static List<String> createHourString() {
 List<String> wheelString = new ArrayList<>();
 for (int i = 0; i < 24; i++) {
  wheelString.add(String.format("%02d" + " ", i));
 }
 return wheelString;
 }
 
 private static List<String> createMinuteString() {
 List<String> wheelString = new ArrayList<>();
 for (int i = 0; i < 60; i++) {
  wheelString.add(String.format("%02d" + " ", i));
 }
 return wheelString;
 }
 
 private static List<String> createYearString() {
 List<String> wheelString = new ArrayList<>();
 for (int i = minYear; i <= maxYear; i++) {
  wheelString.add(Integer.toString(i));
 }
 return wheelString;
 }
 
 private static List<String> createMonthString() {
 List<String> wheelString = new ArrayList<>();
 for (int i = 1; i <= 12; i++) {
  wheelString.add(String.format("%02d" + " ", i));
 }
 return wheelString;
 }
 
 private static List<String> createDayString() {
 List<String> wheelString = new ArrayList<>();
 for (int i = 1; i <= 31; i++) {
  wheelString.add(String.format("%02d" + " ", i));
 }
 return wheelString;
 }
 
 private static List<String> createSimpleDayString() {
 List<String> wheelString = new ArrayList<>();
 wheelString.add("   ");
 wheelString.add("   ");
 wheelString.add("   ");
 return wheelString;
 }
 
 private static List<String> createSetWarnTimeString() {
 List<String> wheelString = new ArrayList<>();
 wheelString.add("30  ");
 wheelString.add("60  ");
 wheelString.add("90  ");
 wheelString.add("120  ");
 return wheelString;
 }
 /**
 *     
 *
 * @param month
 * @return
 */
 private static boolean isLeapMonth(int month) {
 return month == 1 || month == 3 || month == 5 || month == 7
  || month == 8 || month == 10 || month == 12;
 }
 
 /**
 *     
 *
 * @param year
 * @return
 */
 private static boolean isLeapYear(int year) {
 return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
 }
}
3.使用するxml

<com.example.view.timeview.WheelView
  android:id="@+id/select_time_simple_wheel"
  android:layout_width="match_parent"
  android:layout_height="150dp"
  android:layout_marginLeft="20dp"
  android:layout_marginRight="20dp"
  android:layout_weight="1" />
4.JavaファイルにmWheelView.setWheelStyle(WheelSteyle.STYLE_)を設定する。YES);WheelSteyleクラスで設定されているタイプを表示できます。このクラスのスタイルの種類は読者が自分の必要に応じて自分で追加できます。
5.現在選択されている項目を取得するのも簡単です。mWheelView.get CurrrentItem()コントロールの現在選択されている項目が取得できます。所在の項目を取得してから残るのが論理操作です。
以上が本文の全部です。皆さんの勉強に役に立つように、私たちを応援してください。