本文实例为大家分享了android实现年龄段选择器的具体代码，供大家参考，具体内容如下
效果就是滑动圆形按钮选择时间，废话不多说，先上工具类
代码语言：javascript复制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);
}
}在xml中
代码语言：javascript复制<com.zhiziyun.dmptest.bot.util.RangeSeekBar
android:id="@ id/rangeSeekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content" / 最后在代码中调用
代码语言：javascript复制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);
}
});写完收工。
以上就是本文的全部内容，希望对大家的学习有所帮助。
