implementation 'com.chaowen.util:moretextview:1.0'

 <com.chaowen.moretextview.MoreTextView
        android:id="@+id/moreTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/moretext"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

         moreTextView.setShowingLine(2); //只显示2行
       // moreTextView.setShowingChar(30);  //只显示30个字

        //设置展开与收起的文字
        moreTextView.addShowMoreText("展开");
        moreTextView.addShowLessText("收起");
         //设置文字颜色
        moreTextView.setShowMoreColor(Color.RED); 
        moreTextView.setShowLessTextColor(Color.RED);