android实现年龄段选择器

import android.view.View;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.util.AttributeSet;import android.view.MotionEvent;import com.zhiziyun.dmptest.bot.R;/** * Created by Administrator on 2018/7/27. */public class RangeSeekBar extends View { private float lineWidth = 5.0f; private float textSize = 25.0f; private int inRangeColor = 0xff247ab7; private int outRangeColor = 0xff777777; private int textColor = 0xff247ab7; private int textMarginBottom = 10; private int lowerCenterX; private int upperCenterX; private int bmpWidth; private int bmpHeight; private Bitmap lowerBmp; private Bitmap upperBmp; private Paint inRangePaint; private Paint outRangePaint; private Paint bmpPaint; private Paint textPaint; private boolean isLowerMoving = false; private boolean isUpperMoving = false; private OnRangeChangedListener onRangeChangedListener; private int paddingLeft = 50; private int paddingRight = 50; private int paddingTop = 50; private int paddingBottom = 10; private int lineHeight; private int lineLength = 400; private int lineStart = paddingLeft; private int lineEnd = lineLength + paddingLeft; private float smallValue = 13.0f;//最小值 private float bigValue = 60.0f;//最大值 private float smallRange = smallValue; private float bigRange = bigValue; private int textHeight; public RangeSeekBar(Context context) {  super(context);  init(); } public RangeSeekBar(Context context, AttributeSet attrs) {  super(context, attrs);  init(); } public RangeSeekBar(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle);  init(); } private void init() {  lowerBmp = BitmapFactory.decodeResource(getResources(),    R.drawable.circular);//圆形按钮图标，自己设置  upperBmp = BitmapFactory.decodeResource(getResources(),    R.drawable.circular);//圆形按钮图标，自己设置  bmpWidth = upperBmp.getWidth();  bmpHeight = upperBmp.getHeight();  lowerCenterX = lineStart;  upperCenterX = lineEnd;  lineHeight = getHeight() - paddingBottom - lowerBmp.getHeight() / 2;  textHeight = lineHeight + lowerBmp.getHeight() / 2 + 10; } private void initPaint() {  // 绘制范围内的线条  inRangePaint = new Paint();  inRangePaint.setAntiAlias(true);  inRangePaint.setStrokeWidth(lineWidth);  inRangePaint.setColor(inRangeColor);  // 绘制范围外的线条  outRangePaint = new Paint();  outRangePaint.setAntiAlias(true);  outRangePaint.setStrokeWidth(lineWidth);  outRangePaint.setColor(outRangeColor);  // 画图片滑块  bmpPaint = new Paint();  // 画范围文字  textPaint = new Paint();  textPaint.setColor(textColor);  textPaint.setTextSize(textSize);  textPaint.setAntiAlias(true);  textPaint.setStrokeWidth(lineWidth); } private int measureWidth(int measureSpec) {  int result = 0;  int specMode = MeasureSpec.getMode(measureSpec);  int specSize = MeasureSpec.getSize(measureSpec);  if (specMode == MeasureSpec.EXACTLY) {   result = specSize;  } else {   result = paddingLeft + paddingRight + bmpWidth * 2;   if (specMode == MeasureSpec.AT_MOST) {    result = Math.min(result, specSize);   }  }  return result; } private int measureHeight(int measureHeight) {  int result = 0;  int specMode = MeasureSpec.getMode(measureHeight);  int specSize = MeasureSpec.getSize(measureHeight);  if (specMode == MeasureSpec.EXACTLY) {   result = bmpHeight * 2;  } else {   result = bmpHeight + paddingTop;   if (specMode == MeasureSpec.AT_MOST) {    result = Math.min(result, specSize);   }  }  return result; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  widthMeasureSpec = measureWidth(widthMeasureSpec);  heightMeasureSpec = measureHeight(heightMeasureSpec);  setMeasuredDimension(widthMeasureSpec, heightMeasureSpec); } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  bmpWidth = upperBmp.getWidth();  bmpHeight = upperBmp.getHeight();  lineHeight = getHeight() - paddingBottom - lowerBmp.getHeight() / 2;  textHeight = lineHeight - bmpHeight / 2 - textMarginBottom;  // 画线  Paint linePaint = new Paint();  linePaint.setAntiAlias(true);  linePaint.setStrokeWidth(lineWidth);  // 绘制处于图片滑块之间线段  linePaint.setColor(inRangeColor);  canvas.drawLine(lowerCenterX, lineHeight, upperCenterX, lineHeight,    linePaint);  // 绘制处于图片滑块两端的线段  linePaint.setColor(outRangeColor);  canvas.drawLine(lineStart, lineHeight, lowerCenterX, lineHeight,    linePaint);  canvas.drawLine(upperCenterX, lineHeight, lineEnd, lineHeight,    linePaint);  // 画图片滑块  Paint bmpPaint = new Paint();  canvas.drawBitmap(lowerBmp, lowerCenterX - bmpWidth / 2, lineHeight    - bmpHeight / 2, bmpPaint);  canvas.drawBitmap(lowerBmp, upperCenterX - bmpWidth / 2, lineHeight    - bmpHeight / 2, bmpPaint);  // 画范围文字  Paint textPaint = new Paint();  textPaint.setColor(textColor);  textPaint.setTextSize(textSize);  textPaint.setAntiAlias(true);  textPaint.setStrokeWidth(lineWidth);  canvas.drawText(String.format("%.0f岁", smallRange), lowerCenterX    - bmpWidth / 2, textHeight, textPaint);  canvas.drawText(String.format("%.0f岁", bigRange), upperCenterX    - bmpWidth / 2, textHeight, textPaint); } @Override public boolean onTouchEvent(MotionEvent event) {  super.onTouchEvent(event);  float xPos = event.getX();  switch (event.getAction()) {   case MotionEvent.ACTION_DOWN:    // 如果按下的位置在垂直方向没有与图片接触，则不会滑动滑块    float yPos = event.getY();    if (Math.abs(yPos - lineHeight) > bmpHeight / 2) {     return false;    }    // 表示当前按下的滑块是左边的滑块    if (Math.abs(xPos - lowerCenterX) < bmpWidth / 2) {     isLowerMoving = true;    }    // //表示当前按下的滑块是右边的滑块    if (Math.abs(xPos - upperCenterX) < bmpWidth / 2) {     isUpperMoving = true;    }    // 单击左边滑块的左边线条时，左边滑块滑动到对应的位置    if (xPos >= lineStart && xPos <= lowerCenterX - bmpWidth / 2) {     lowerCenterX = (int) xPos;     updateRange();     postInvalidate();    }    // 单击右边滑块的右边线条时， 右边滑块滑动到对应的位置    if (xPos <= lineEnd && xPos >= upperCenterX + bmpWidth / 2) {     upperCenterX = (int) xPos;     updateRange();     postInvalidate();    }    break;   case MotionEvent.ACTION_MOVE:    // 滑动左边滑块时    if (isLowerMoving) {     if (xPos >= lineStart && xPos < upperCenterX - bmpWidth) {      lowerCenterX = (int) xPos;      updateRange();      postInvalidate();     }    }    // 滑动右边滑块时    if (isUpperMoving) {     if (xPos > lowerCenterX + bmpWidth && xPos < lineEnd) {      upperCenterX = (int) xPos;      updateRange();      postInvalidate();     }    }    break;   case MotionEvent.ACTION_UP:    // 修改滑块的滑动状态为不再滑动    isLowerMoving = false;    isUpperMoving = false;    break;   default:    break;  }  return true; } // 计算指定滑块对应的范围值 private float computRange(float range) {  return (range - lineStart) * (bigValue - smallValue) / lineLength    + smallValue; } // 滑动滑块的过程中，更新滑块上方的范围标识 private void updateRange() {  smallRange = computRange(lowerCenterX);  bigRange = computRange(upperCenterX);  if (null != onRangeChangedListener) {   onRangeChangedListener.onRangeChanged(smallRange, bigRange);  } } // 注册滑块范围值改变事件的监听 public void setOnRangeChangedListener(   OnRangeChangedListener onRangeChangedListener) {  this.onRangeChangedListener = onRangeChangedListener; } // 公共接口，用户回调接口范围值的改变 public interface OnRangeChangedListener {  public void onRangeChanged(float lowerRange, float upperRange); }}

<com.zhiziyun.dmptest.bot.util.RangeSeekBar    android:id="@+id/rangeSeekBar"    android:layout_width="match_parent"    android:layout_height="wrap_content" />

rangeSeekBar = (RangeSeekBar) findViewById(R.id.rangeSeekBar);  rangeSeekBar.setOnRangeChangedListener(new RangeSeekBar.OnRangeChangedListener() {   @Override   public void onRangeChanged(float lowerRange, float upperRange) {    tv_age.setText((int) lowerRange + "~" + (int) upperRange);   }  });