给Android 原生的SeekBar控件添加一个指示器标签；记录一下

按下时弹出popupwindow，进度条更新时刷新pw，松开时关闭pw；

public class SeekBarPopUtils {private static PopupWindow popWin = null;private static ConstraintLayout clPopPar = null;private static TextView tvPopTxt = null;public static void showPop(int progress,View seekBar){popWin = new PopupWindow();View mPopView = LayoutInflater.from(BaseApp.Companion.getAppContext()).inflate(R.layout.item_popup_win,null,false);clPopPar = mPopView.findViewById(R.id.cl_pop_par);tvPopTxt = mPopView.findViewById(R.id.tv_pop_txt);popWin.setContentView(mPopView);popWin.setHeight(dp2px(30));popWin.setWidth(seekBar.getWidth());popWin.showAsDropDown(seekBar,0,-(dp2px(30) + popWin.getHeight()));move(progress,seekBar);}public static void move(int progress,View seekBar){if (clPopPar != null){int tvPopWidth = dp2px(40);ConstraintLayout.LayoutParams params  = new ConstraintLayout.LayoutParams(tvPopWidth, dp2px(30));params.startToStart = clPopPar.getId();params.setMarginStart((seekBar.getWidth() - tvPopWidth)/100 * progress + tvPopWidth/3);tvPopTxt.setLayoutParams(params);tvPopTxt.setText(progress"");}}private static int dp2px(int dpVal){return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,(float) dpVal,BaseApp.Companion.getAppContext().getResources().getDisplayMetrics());}public static void dismiss(){popWin.dismiss();popWin = null;clPopPar = null;tvPopTxt = null;}
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayoutandroid:id="@+id/cl_pop_par"xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="30dp"android:layout_height="40dp"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"><TextViewandroid:id="@+id/tv_pop_txt"android:layout_width="30dp"android:layout_height="40dp"android:gravity="center"android:paddingBottom="10px"app:layout_constraintStart_toStartOf="parent"app:layout_constraintBottom_toBottomOf="parent"android:textSize="14sp"android:background="@mipmap/popup_center_seekbar_qipao"android:textColor="#fff"tools:text = "55" /></androidx.constraintlayout.widget.ConstraintLayout>

使用：

mSeekbar.setOnSeekBarChangeListener(object: SeekBar.OnSeekBarChangeListener{override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {SeekBarPopUtils.move(progress,seekBar!!)}override fun onStartTrackingTouch(seekBar: SeekBar?) {SeekBarPopUtils.showPop(seekBar!!)}override fun onStopTrackingTouch(seekBar: SeekBar?) {SeekBarPopUtils.dismiss()}})