ExpandableTextView 是一个用于 Android 的可展开折叠的文本控件，它允许用户在需要时展开或收起文本。这个控件可以指定展开和收起提示的位置及样式，以提供更好的用户体验。

当用户点击一个可展开/收起按钮或触摸一个可展开/收起区域时，ExpandableTextView 将显示相应的提示信息。这些提示可以是文本、图标或其他视觉元素，以指示用户如何操作控件。

要自定义 ExpandableTextView 的展开收起提示，您需要继承 ExpandableTextView 类并重写相关方法。以下是一个简单的示例：

```java
import android.content.Context;
import android.graphics.drawable.GradientDrawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ExpandableText;
import android.widget.ExpandableText.OnExpandListener;
import android.widget.ExpandableText.OnCollapseListener;
import android.widget.ExpandableText.OnExpandTypeListener;
import android.widget.ExpandableText.OnExpandTypeListener2;
import android.widget.ExpandableText.OnExpandTypeListener3;
import android.widget.ExpandableText.OnExpandTypeListener4;
import android.widget.ExpandableText.OnExpandTypeListener5;
import android.widget.ExpandableText.OnExpandTypeListener6;
import android.widget.ExpandableText.OnExpandTypeListener7;
import android.widget.ExpandableText.OnExpandTypeListener8;
import android.widget.ExpandableText.OnExpandTypeListener9;
import android.widget.ExpandableText.OnExpandTypeListener10;
import android.widget.ExpandableText.OnExpandTypeListener11;
import android.widget.ExpandableText.OnExpandTypeListener12;
import android.widget.ExpandableText.OnExpandTypeListener13;
import android.widget.ExpandableText.OnExpandTypeListener14;
import android.widget.ExpandableText.OnExpandTypeListener15;
import android.widget.ExpandableText.OnExpandTypeListener16;
import android.widget.ExpandableText.OnExpandTypeListener17;
import android.widget.ExpandableText.OnExpandTypeListener18;
import android.widget.ExpandableText.OnExpandTypeListener19;
import android.widget.ExpandableText.OnExpandTypeListener20;
import android.widget.ExpandableText.OnExpandTypeListener21;
import android.widget.ExpandableText.OnExpandTypeListener22;
import android.widget.ExpandableText.OnExpandTypeListener23;
import android.widget.ExpandableText.OnExpandTypeListener24;
import android.widget.ExpandableText.OnExpandTypeListener25;
import android.widget.ExpandableText.OnExpandTypeListener26;
import android.widget.ExpandableText.OnExpandTypeListener27;
import android.widget.ExpandableText.OnExpandTypeListener28;
import android.widget.ExpandableText.OnExpandTypeListener29;
import android.widget.ExpandableText.OnExpandTypeListener30;
import android.widget.ExpandableText.OnExpandTypeListener31;
import android.widget.ExpandableText.OnExpandTypeListener32;
import android.widget.ExpandableText.OnExpandTypeListener33;
import android.widget.ExpandableText.OnExpandTypeListener34;
import android.widget.ExpandableText.OnExpandTypeListener35;
import android.widget.ExpandableText.OnExpandTypeListener36;
import android.widget.ExpandableText.OnExpandTypeListener37;
import android.widget.ExpandableText.OnExpandTypeListener38;
import android.widget.ExpandableText.OnExpandTypeListener39;
import android.widget.ExpandableText.OnExpandTypeListener40;
import android.widget.ExpandableText.OnExpandTypeListener41;
import android.widget.ExpandableText.OnExpandTypeListener42;
import android.widget.ExpandableText.OnExpandTypeListener43;
import android.widget.ExpandableText.OnExpandTypeListener44;
import android.widget.ExpandableText.OnExpandTypeListener45;
import android.widget.ExpandableText.OnExpandTypeListener46;
import android.widget.ExpandableText.OnExpandTypeListener47;
import android.widget.ExpandableText.OnExpandTypeListener48;
import android.widget.ExpandableText.OnExpandTypeListener49;
import android.widget.ExpandableText.OnExpandTypeListener50;
import android.widget.ExpandableText.OnExpandTypeListener51;
import android.widget.ExpandableText.OnExpandTypeListener52;
import android.widget.ExpandableText.OnExpandTypeListener53;
import android.widget.ExpandableText.OnExpandTypeListener54;
import android.widget.ExpandableText.OnExpandTypeListener55;
import android.widget.ExpandableText.OnExpandTypeListener56;
import android.widget.ExpandableText.OnExpandTypeListener57;
import android.widget.ExpandableText.OnExpandTypeListener58;
import android.widget.ExpandableText.OnExpandTypeListener59;
import android.widget.ExpandableText.OnExpandTypeListener60;
import android.widget.ExpandableText.OnExpandTypeListener61;
import android.widget.ExpandableText.OnExpandTypeListener62;
import android.widget.ExpandableText.OnExpandTypeListener63;
import android.widget.ExpandableText.OnExpandTypeListener64;
import android.widget.ExpandableText.OnExpandTypeListener65;
import android.widget.ExpandableText.OnExpandTypeListener66;
import android.widget.ExpandableText.OnExpandTypeListener67;
import android.widget.ExpandableText.OnExpandTypeListener68;
import android.widget.ExpandableText.OnExpandTypeListener69;
import android.widget.ExpandableText.OnExpandTypeListener70;
import android.widget.ExpandableText.OnExpandTypeListener71;
import android.widget.ExpandableText.OnExpandTypeListener72;
import android.widget.ExpandableText.OnExpandTypeListener73;
import android.widget.ExpandableText.OnExpandTypeListener74;
import android.widget.ExpandableText.OnExpandTypeListener75;
import android.widget.ExpandableText.OnExpandTypeListener76;
import android.widget.ExpandableText.OnExpandTypeListener77;
import android.widget.ExpandableText.OnExpandTypeListener78;
import android.widget.ExpandableText.OnExpandTypeListener79;
import android.widget.ExpandableText.OnExpandTypeListener80;
import android.widget.ExpandableText.OnExpandTypeListener81;
import android.widget.ExpandableText.OnExpandTypeListener82;
import android.widget.ExpandableText.OnExpandTypeListener83;
import android.widget.ExpandableText.OnExpandTypeListener84;
import android.widget.ExpandableText.OnExpandTypeListener85;
import android.widget.ExpandableText.OnExpandTypeListener86;
import android.widget.ExpandableText.OnExpandTypeListener87;
import android.widget.ExpandableText.OnExpandTypeListener88;
import android.widget.ExpandableText.OnExpandTypeListener89;
import android.widget.ExpandableText.OnExpandTypeListener90;
import android.widget.ExpandableText.OnExpandTypeListener91;
import android.widget.ExpandableText.OnExpandTypeListener92;
import android.widget.ExpandableText.OnExpandTypeListener93;
import android.widget.ExpandableText.OnExpandTypeListener94;
import android.widget.ExpandableText.OnExpandTypeListener95;
import android.widget.ExpandableText.OnExpandTypeListener96;
import android.widget.ExpandableText.OnExpandTypeListener97;
import android.widget.ExpandableText.OnExpandTypeListener98;
import android.widget.ExpandableText一个用于Android的可展开折叠的文本控件,可以指定展开收起提示的位置及样式