How to use

ExpandableTextView

in

com.ms.square.android.expandabletextview

public void setText(@Nullable CharSequence text, @NonNull SparseBooleanArray collapsedStatus, int position) {
  mCollapsedStatus = collapsedStatus;
  mPosition = position;
  boolean isCollapsed = collapsedStatus.get(position, true);
  clearAnimation();
  mCollapsed = isCollapsed;
  mExpandIndicatorController.changeState(mCollapsed);
  setText(text);
}

private void findViews() {
  mTv = (TextView) findViewById(mExpandableTextId);
  if (mExpandToggleOnTextClick) {
    mTv.setOnClickListener(this);
  } else {
    mTv.setOnClickListener(null);
  }
  mToggleView = findViewById(mExpandCollapseToggleId);
  mExpandIndicatorController.setView(mToggleView);
  mExpandIndicatorController.changeState(mCollapsed);
  mToggleView.setOnClickListener(this);
}

@Override
protected void onFinishInflate() {
  super.onFinishInflate();
  findViews();
}

public void setText(@Nullable CharSequence text) {
  mRelayout = true;
  mTv.setText(text);
  setVisibility(TextUtils.isEmpty(text) ? View.GONE : View.VISIBLE);
  clearAnimation();
  getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
  requestLayout();
}

private void init(AttributeSet attrs) {
  TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ExpandableTextView);
  mMaxCollapsedLines = typedArray.getInt(R.styleable.ExpandableTextView_maxCollapsedLines, MAX_COLLAPSED_LINES);
  mAnimationDuration = typedArray.getInt(R.styleable.ExpandableTextView_animDuration, DEFAULT_ANIM_DURATION);
  mAnimAlphaStart = typedArray.getFloat(R.styleable.ExpandableTextView_animAlphaStart, DEFAULT_ANIM_ALPHA_START);
  mExpandableTextId = typedArray.getResourceId(R.styleable.ExpandableTextView_expandableTextId, R.id.expandable_text);
  mExpandCollapseToggleId = typedArray.getResourceId(R.styleable.ExpandableTextView_expandCollapseToggleId, R.id.expand_collapse);
  mExpandToggleOnTextClick = typedArray.getBoolean(R.styleable.ExpandableTextView_expandToggleOnTextClick, true);
  mExpandIndicatorController = setupExpandToggleController(getContext(), typedArray);
  typedArray.recycle();
  // enforces vertical orientation
  setOrientation(LinearLayout.VERTICAL);
  // default visibility is gone
  setVisibility(GONE);
}

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_demo1, container, false);
    ((TextView) rootView.findViewById(R.id.sample1).findViewById(R.id.title)).setText("Sample 1");
    ((TextView) rootView.findViewById(R.id.sample2).findViewById(R.id.title)).setText("Sample 2");
    ExpandableTextView expTv1 = (ExpandableTextView) rootView.findViewById(R.id.sample1)
        .findViewById(R.id.expand_text_view);
    ExpandableTextView expTv2 = (ExpandableTextView) rootView.findViewById(R.id.sample2)
        .findViewById(R.id.expand_text_view);
    expTv1.setOnExpandStateChangeListener(new ExpandableTextView.OnExpandStateChangeListener() {
      @Override
      public void onExpandStateChanged(TextView textView, boolean isExpanded) {
        Toast.makeText(getActivity(), isExpanded ? "Expanded" : "Collapsed", Toast.LENGTH_SHORT).show();
      }
    });
    expTv1.setText(getString(R.string.dummy_text1));
    expTv2.setText(getString(R.string.dummy_text2));
    return rootView;
  }
}

  animation = new ExpandCollapseAnimation(this, getHeight(), mCollapsedHeight);
} else {
  animation = new ExpandCollapseAnimation(this, getHeight(), getHeight() +
      mTextHeightWithMaxLines - mTv.getHeight());
});
clearAnimation();
startAnimation(animation);

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  if (!mRelayout || getVisibility() == View.GONE) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    return;
  mTextHeightWithMaxLines = getRealTextViewHeight(mTv);
    mCollapsedHeight = getMeasuredHeight();

@Override
public View getView(int position, View convertView, ViewGroup parent) {
  final ViewHolder viewHolder;
  if (convertView == null) {
    convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);
    viewHolder = new ViewHolder();
    viewHolder.expandableTextView = (ExpandableTextView) convertView.findViewById(R.id.expand_text_view);
    convertView.setTag(viewHolder);
  } else {
    viewHolder = (ViewHolder) convertView.getTag();
  }
  viewHolder.expandableTextView.setText(sampleStrings[position], mCollapsedStatus, position);
  return convertView;
}

  @Override
  public void run() {
    mMarginBetweenTxtAndBottom = getHeight() - mTv.getHeight();
  }
});

@Override
public void onAnimationEnd(Animation animation) {
  // clear animation here to avoid repeated applyTransformation() calls
  clearAnimation();
  // clear the animation flag
  mAnimating = false;
  // notify the listener
  if (mListener != null) {
    mListener.onExpandStateChanged(mTv, !mCollapsed);
  }
}
@Override

private static ExpandIndicatorController setupExpandToggleController(@NonNull Context context, TypedArray typedArray) {
  final int expandToggleType = typedArray.getInt(R.styleable.ExpandableTextView_expandToggleType, DEFAULT_TOGGLE_TYPE);
  final ExpandIndicatorController expandIndicatorController;
  switch (expandToggleType) {
    case EXPAND_INDICATOR_IMAGE_BUTTON:
      Drawable expandDrawable = typedArray.getDrawable(R.styleable.ExpandableTextView_expandIndicator);
      Drawable collapseDrawable = typedArray.getDrawable(R.styleable.ExpandableTextView_collapseIndicator);
      if (expandDrawable == null) {
        expandDrawable = getDrawable(context, R.drawable.ic_expand_more_black_12dp);
      }
      if (collapseDrawable == null) {
        collapseDrawable = getDrawable(context, R.drawable.ic_expand_less_black_12dp);
      }
      expandIndicatorController = new ImageButtonExpandController(expandDrawable, collapseDrawable);
      break;
    case EXPAND_INDICATOR_TEXT_VIEW:
      String expandText = typedArray.getString(R.styleable.ExpandableTextView_expandIndicator);
      String collapseText = typedArray.getString(R.styleable.ExpandableTextView_collapseIndicator);
      expandIndicatorController = new TextViewExpandController(expandText, collapseText);
      break;
    default:
      throw new IllegalStateException("Must be of enum: ExpandableTextView_expandToggleType, one of EXPAND_INDICATOR_IMAGE_BUTTON or EXPAND_INDICATOR_TEXT_VIEW.");
  }
  return expandIndicatorController;
}