仿荷包投资的滑块

水深无声 2022-07-15 09:27 147阅读 0赞

遇到个需要仿荷包这个滑块的需求![Center][]![Image 1][]

第一想法使用seekbar来实现，结果android:tickMark属性需要API24以上，瞬间无语了，API24的用户目前又有几个呢？

然后想自定义seekbar，结果做出来后拖动的时候一闪一闪的，没有中间过程。

突然想起鸿神的一篇文章里有个拖动控件的ViewDragHelper，[http://blog.csdn.net/lmj623565791/article/details/46858663][http_blog.csdn.net_lmj623565791_article_details_46858663]；

稍微修改一下不就是我所需要的吗，我把它里面的多余的去掉，就留了一个回弹的view，然后修改了下回弹的位置，并且用canvas画出几个圆点，大功告成。

![Center 1][]

![Image 1][]

先贴上我的布局文件，中间那条线是单独的一个view

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="10dp">
    
        <View
            android:layout_width="match_parent"
            android:layout_height="3dp"
            android:layout_centerVertical="true"
            android:background="@color/colorAccent" />
    
        <com.tshouyi.vdhdemo.VDHLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:orientation="vertical">
    
            <TextView
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:layout_gravity="left"
                android:background="@mipmap/bg"
                android:clickable="true"
                android:gravity="center"
                android:text="back" />
    
        </com.tshouyi.vdhdemo.VDHLayout>
    </RelativeLayout>

代码注释也很详细了，没注释的地方我也不知道

package com.tshouyi.vdhdemo;
    
    import android.animation.ValueAnimator;
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Point;
    import android.support.v4.widget.ViewDragHelper;
    import android.util.AttributeSet;
    import android.view.MotionEvent;
    import android.view.View;
    import android.widget.LinearLayout;
    
    /**
     * Created by zxy on 2016/11/11.
     */
    
    public class VDHLayout extends LinearLayout {
        private ViewDragHelper mDragger;
        private View mAutoBackView;
        private Point[] mAutoBackOriginPos =
                {
                        new Point(0, 0),
                        new Point(0, 0),
                        new Point(0, 0),
                        new Point(0, 0),
                        new Point(0, 0),
                };//5个原点坐标数组初始值
    
        public VDHLayout(Context context, AttributeSet attrs) {
            super(context, attrs);
            setWillNotDraw(false);//没这个方法就不执行onDraw，我也不知道为什么
            //1、创建实例
            mDragger = ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback()//3、实现ViewDragHelper.CallCack相关方法
            {
                /**
                 * 如果子View不消耗事件（clickable=false），那么整个手势（DOWN-MOVE*-UP）都是直接进入onTouchEvent，在onTouchEvent的DOWN的时候就确定了captureView。
                 * 如果消耗事件，那么就会先走onInterceptTouchEvent方法，判断是否可以捕获，而在判断的过程中会去判断另外两个回调的方法：
                 * getViewHorizontalDragRange和getViewVerticalDragRange，只有这两个方法返回大于0的值才能正常的捕获。
                 */
                @Override
                public boolean tryCaptureView(View child, int pointerId) {//tryCaptureView如果返回ture则表示可以捕获该view
                    //mEdgeTrackerView禁止直接移动
                    return child == mAutoBackView;
                }
    
                /**
                 * clampViewPositionHorizontal,clampViewPositionVertical可以在该方法中对child移动的边界进行控制，
                 * left , top 分别为即将移动到的位置,以下代码表示内部移动效果
                 */
                @Override
                public int clampViewPositionHorizontal(View child, int left, int dx) {
                    final int leftBound = getPaddingLeft();
                    final int rightBound = getWidth() - mAutoBackView.getWidth() - leftBound;
                    final int newLeft = Math.min(Math.max(left, leftBound), rightBound);
                    return newLeft;
                }
    
                @Override
                public int clampViewPositionVertical(View child, int top, int dy) {
                    return mAutoBackOriginPos[0].y;//水平滑动，y是固定的
                }
    
                //手指释放的时候回调
                @Override
                public void onViewReleased(View releasedChild, float xvel, float yvel) {
    
                    //mAutoBackView手指释放时可以自动回去
                    if (releasedChild == mAutoBackView) {
                        //判断不同范围回到最近的圆点
                        if (mAutoBackView.getLeft() < mAutoBackOriginPos[1].x / 2) {
                            mDragger.settleCapturedViewAt(mAutoBackOriginPos[0].x, mAutoBackOriginPos[0].y);
                        } else if (mAutoBackView.getLeft() < 3 * mAutoBackOriginPos[1].x / 2) {
                            mDragger.settleCapturedViewAt(mAutoBackOriginPos[1].x, mAutoBackOriginPos[0].y);
                        } else if (mAutoBackView.getLeft() < 5 * mAutoBackOriginPos[1].x / 2) {
                            mDragger.settleCapturedViewAt(mAutoBackOriginPos[2].x, mAutoBackOriginPos[0].y);
                        } else if (mAutoBackView.getLeft() < 7 * mAutoBackOriginPos[1].x / 2) {
                            mDragger.settleCapturedViewAt(mAutoBackOriginPos[3].x, mAutoBackOriginPos[0].y);
                        } else {
                            mDragger.settleCapturedViewAt(mAutoBackOriginPos[4].x, mAutoBackOriginPos[0].y);
                        }
                        invalidate();
                    }
                }
    
                @Override
                public int getViewHorizontalDragRange(View child) {
                    return getMeasuredWidth() - child.getMeasuredWidth();
                }
    
                @Override
                public int getViewVerticalDragRange(View child) {
                    return getMeasuredHeight() - child.getMeasuredHeight();
                }
    
            });
    
        }
    
        //    2、触摸相关方法
        @Override
        public boolean onInterceptTouchEvent(MotionEvent event) {
            return mDragger.shouldInterceptTouchEvent(event);//决定我们是否应该拦截当前的事件
        }
    
        int position;
    
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            if (event.getX() > mAutoBackView.getLeft() && event.getX() < mAutoBackView.getRight()) {//按下时在滑块范围内说明要拖动
                mDragger.processTouchEvent(event);//处理触摸事件
            } else {//else滑动滑块到触摸位置最近的圆点
                if (event.getX() - 60 < mAutoBackOriginPos[1].x / 2) {
                    //点击该范围移动到第一个点，60是什么我也不知道，不要这个就点不准
                    position = 0;
                } else if (event.getX() - 60 < 3 * mAutoBackOriginPos[1].x / 2) {
                    position = mAutoBackOriginPos[1].x;
                } else if (event.getX() - 60 < 5 * mAutoBackOriginPos[1].x / 2) {
                    position = 2 * mAutoBackOriginPos[1].x;
                } else if (event.getX() - 60 < 7 * mAutoBackOriginPos[1].x / 2) {
                    position = 3 * mAutoBackOriginPos[1].x;
                } else {
                    position = 4 * mAutoBackOriginPos[1].x;
                }
                //1.调用ofInt(int...values)方法创建ValueAnimator对象
                int pNow = mAutoBackView.getLeft();
                ValueAnimator mAnimator = ValueAnimator.ofInt(pNow, position);
                //2.为目标对象的属性变化设置监听器
                mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                    @Override
                    public void onAnimationUpdate(ValueAnimator animation) {
                        // 3.为目标对象的属性设置计算好的属性值
                        int animatorValue = (int) animation.getAnimatedValue();
                        MarginLayoutParams marginLayoutParams = (MarginLayoutParams) mAutoBackView.getLayoutParams();
                        marginLayoutParams.leftMargin = animatorValue;
                        mAutoBackView.setLayoutParams(marginLayoutParams);
                    }
                });
                //4.设置动画的持续时间、是否重复及重复次数等属性
                mAnimator.setDuration(Math.abs(pNow - position) * 2);
                mAnimator.setRepeatCount(0);
                mAnimator.setRepeatMode(ValueAnimator.REVERSE);
                //5.为ValueAnimator设置目标对象并开始执行动画
                mAnimator.setTarget(mAutoBackView);
                mAnimator.start();
                invalidate();
            }
            return true;
        }
    
    
        @Override
        public void computeScroll() {
            if (mDragger.continueSettling(true)) {
                invalidate();
            }
        }
    
        @Override
        protected void onLayout(boolean changed, int l, int t, int r, int b) {
            super.onLayout(changed, l, t, r, b);
            //保存5个原点的位置信息（左边缘坐标）,不懂的参考图片
            for (int i = 0; i < 5; i++) {
                mAutoBackOriginPos[i].x = i * ((r - l) - (mAutoBackView.getRight() - mAutoBackView.getLeft())) / 4;
                mAutoBackOriginPos[i].y = mAutoBackView.getTop();
            }
        }
    
    
        @Override
        protected void onFinishInflate() {
            super.onFinishInflate();
            mAutoBackView = getChildAt(0);//加载view
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            Paint paint = new Paint();
            paint.setColor(Color.BLUE);
            paint.setAntiAlias(true);
            //画圆点
            for (int i = 0; i < 5; i++) {
                canvas.drawCircle(mAutoBackOriginPos[i].x + (mAutoBackView.getRight() - mAutoBackView.getLeft()) / 2,
                        mAutoBackOriginPos[i].y + (mAutoBackView.getBottom() - mAutoBackView.getTop()) / 2, 15, paint);
            }
        }
    }

不懂的再看一下这张图吧

![Center 2][]

![Image 1][]

好了，就这样吧。

顺便把另外一种自定义seek利用seek的进度的方式贴上，原理就是通过改变seekbar的进度来滑动到指定位置。

先看xml文件，两个seekbar重合，上面seekbar个仅仅是为了得到圆点，也就是将Base.Widget.AppCompat.SeekBar.Discrete重新定义了一下，第二个的最大值设置为200

接下来是自定义的样式

引用的shape文件

<?xml version="1.0" encoding="utf-8"?>
    <shape xmlns:android="http://schemas.android.com/apk/res/android"
        android:shape="oval">
        <size
            android:width="12dp"
            android:height="12dp" />
        <solid android:color="@android:color/holo_red_dark" />
    </shape>

activity也很简单，自己看吧

public class MainActivity extends AppCompatActivity {
    
        private SeekBar seekBar;
        boolean check = false;
        int pro;//用来控制滑动时触发的onProgressChanged不进行滑动
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            seekBar = (SeekBar) findViewById(R.id.seekBar);
            SeekBar seekBar2 = (SeekBar) findViewById(R.id.seekBar2);
            seekBar2.setEnabled(false);//去除重叠的后面个seekbar的影响
            seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(final SeekBar seekBar, int i, boolean b) {
                    if (pro==0||pro == seekBar.getProgress() || pro - 1  == seekBar.getProgress()|| pro+ 1 == seekBar.getProgress() ) {
                     //变化值为1的一般不是滑动触发的
                        final int progress = seekBar.getProgress();
                        pro = progress;
                        if (progress < 25) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    if (progress != 0)
                                        seekBar.setProgress(progress - 1);
                                }
                            }, 10);
    
                        } else if (progress < 50) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    seekBar.setProgress(progress + 1);
                                }
                            }, 10);
    
                        } else if (progress < 75) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    if (progress != 50)
                                        seekBar.setProgress(progress - 1);
                                }
                            }, 10);
    
                        } else if (progress < 100) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    seekBar.setProgress(progress + 1);
                                }
                            }, 10);
    
                        } else if (progress < 125) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    if (progress != 100)
                                        seekBar.setProgress(progress - 1);
                                }
                            }, 10);
                        } else if (progress < 150) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    seekBar.setProgress(progress + 1);
                                }
                            }, 10);
                        } else if (progress < 175) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    if (progress != 150)
                                        seekBar.setProgress(progress - 1);
                                }
                            }, 10);
                        } else if (progress < 200) {
                            new Handler().postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    seekBar.setProgress(progress + 1);
                                }
                            }, 10);
                        }
                    }
                }
                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                }
                @Override
                public void onStopTrackingTouch(final SeekBar seekBar) {
                    pro=seekBar.getProgress();
                    seekBar.setProgress(seekBar.getProgress() - 1);
                }
            });
        }
    }

最后效果

![Center 3][]

没怎么写博客，里面问题很多，欢迎指正

[Center]: https://img-blog.csdn.net/20161111153002957?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Image 1]: 
[http_blog.csdn.net_lmj623565791_article_details_46858663]: http://blog.csdn.net/lmj623565791/article/details/46858663
[Center 1]: /images/20220715/6e22f2156ab94763b839bcebfe81b283.png
[Center 2]: /images/20220715/f64ad1ba5650463392ade382134070ae.png
[Center 3]: /images/20220715/39775b96fb3f495b915b6854778f0828.png