类似微信朋友圈回复中的文字展开，折叠

使用：

implementation 'lixs.com.expandtextview:expandtextview:1.0.0'

  <com.lixs.expandtextview.ExpandTextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          app:expand_btn_fold_text="折叠"
          app:expand_btn_text="展开"
          app:expand_is_expand_btn_left="true"
          app:expand_is_expand_init="true"
          app:expand_text_line_multi="1.2"
          app:expand_text_line_space="1"
          app:expand_text_max_line="100"
          app:expand_text_min_line="1"
          app:expand_btn_drawable="@mipmap/ss"
          app:expand_text_content="@string/about_us"
          app:expand_text_scaleX="1"
          app:expand_text_color="@color/expand_text_color"/>