原文地址https://natario1.github.io/CameraView/docs/filters.html

1.组合使用调节（以三组为例）

   //三组滤镜
  private var currentFilter1: Filter = NoFilter()
  private var currentFilter2: Filter = NoFilter()
  private var currentFilter3: Filter = NoFilter()
  //点击切换
  private var count1 = 0
  private var count2 = 0
  private var count3 = 0
 //所有滤镜类型
  private var filters = Filters.values()
      .toMutableList()
//初始化
override fun initData(savedInstanceState: Bundle?) {
    //设置的越大滑动时值越精确
    test1Seek.max = 3600
    test2Seek.max = 3600
    test3Seek.max = 3600
    //默认隐藏三个滑动条
    test1Seek.gone()
    test2Seek.gone()
    test3Seek.gone()
   //监听滑动条
    test1Seek.userChange {
      val temp = currentFilter1
      if (temp is OneParameterFilter) temp.parameter1 = it / 3600f
      showFilter()
    }
    test2Seek.userChange {
      val temp = currentFilter2
      if (temp is OneParameterFilter) temp.parameter1 = it / 3600f
      showFilter()
    }
    test3Seek.userChange {
      val temp = currentFilter3
      if (temp is OneParameterFilter) temp.parameter1 = it / 3600f
      showFilter()
    }
    //监听切换滤镜类型
    test1btn.setOnClickListener {
      count1++
      currentFilter1 = filters[count1 % filters.size].newInstance()
      test1Seek.visibleGone(currentFilter1 is OneParameterFilter)
      showFilter()
      try {
        videoRecorderView.filter = MultiFilter(currentFilter1, currentFilter2, currentFilter3)
      } catch (e: Exception) {
        e.printStackTrace()
      }
    }
    test2btn.setOnClickListener {
      count2++
      currentFilter2 = filters[count2 % filters.size].newInstance()
      test2Seek.visibleGone(currentFilter2 is OneParameterFilter)
      showFilter()
      try {
        videoRecorderView.filter = MultiFilter(currentFilter1, currentFilter2, currentFilter3)
      } catch (e: Exception) {
        e.printStackTrace()
      }
    }
    test3btn.setOnClickListener {
      count3++
      currentFilter3 = filters[count3 % filters.size].newInstance()
      test3Seek.visibleGone(currentFilter3 is OneParameterFilter)
      showFilter()
      try {
        videoRecorderView.filter = MultiFilter(currentFilter1, currentFilter2, currentFilter3)
      } catch (e: Exception) {
        e.printStackTrace()
      }
    }
    showFilter()
}
//刷新当前的组合滤镜信息
 private fun showFilter() {
    testResult.text =
      currentFilter1::class.java.simpleName + ":" + getFilterValue(currentFilter1) + "\n" +
          currentFilter2::class.java.simpleName + ":" + getFilterValue(currentFilter2) + "\n" +
          currentFilter3::class.java.simpleName + ":" + getFilterValue(currentFilter3)
  }
//SeekBar的扩展方法
@SuppressLint("CheckResult")
inline fun SeekBar.userChange(crossinline function: (progress: Int) -> Unit) {
  this.userChanges()
      .skipInitialValue()
      .subscribe({
        function(it)
      }, {
        Timber.e("CASE-userChange-error")
      })
}

2.XML代码

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:background="@color/black_35"
    >

  <com.otaliastudios.cameraview.CameraView
      android:id="@+id/videoRecorderView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:keepScreenOn="true"
      app:cameraAutoFocusResetDelay="60000"
      app:cameraEngine="camera1"
      app:cameraExperimental="true"
      app:cameraGesturePinch="zoom"
      app:cameraGestureTap="autoFocus"
      app:cameraMode="video"
      app:cameraPreview="glSurface"
      >
  </com.otaliastudios.cameraview.CameraView>

  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintStart_toStartOf="parent"
      >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        >

      <Button
          android:id="@+id/test1btn"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="切换"
          />

      <SeekBar
          android:id="@+id/test1Seek"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_marginEnd="12dp"
          android:layout_marginStart="12dp"
          android:maxHeight="2dp"
          android:minHeight="2dp"
          android:progress="56"
          android:progressDrawable="@drawable/layer_list_live_seek"
          android:thumb="@drawable/shape_circle_ff6060_8dp"
          />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        >

      <Button
          android:id="@+id/test2btn"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="切换"
          />

      <SeekBar
          android:id="@+id/test2Seek"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_marginEnd="12dp"
          android:layout_marginStart="12dp"
          android:maxHeight="2dp"
          android:minHeight="2dp"
          android:progress="56"
          android:progressDrawable="@drawable/layer_list_live_seek"
          android:thumb="@drawable/shape_circle_ff6060_8dp"
          />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10dp"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        >

      <Button
          android:id="@+id/test3btn"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="切换"
          />

      <SeekBar
          android:id="@+id/test3Seek"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_marginEnd="12dp"
          android:layout_marginStart="12dp"
          android:maxHeight="2dp"
          android:minHeight="2dp"
          android:progress="56"
          android:progressDrawable="@drawable/layer_list_live_seek"
          android:thumb="@drawable/shape_circle_ff6060_8dp"
          />
    </LinearLayout>
  </LinearLayout>

  <TextView
      android:id="@+id/testResult"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginTop="90dp"
      android:gravity="end"
      android:maxLines="3"
      android:minLines="3"
      android:shadowColor="@color/black_35"
      android:shadowDx="2"
      android:shadowDy="2"
      android:shadowRadius="4"
      android:textColor="@color/white_90"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toTopOf="parent"
      />
</android.support.constraint.ConstraintLayout>