在EditText中间显示选定内容

// 获取EditText对象
EditText editText = findViewById(R.id.editText);

// 获取选定的文本
int startSelection = editText.getSelectionStart();
int endSelection = editText.getSelectionEnd();
String selectedText = editText.getText().toString().substring(startSelection, endSelection);

// 创建SpannableString对象
SpannableString spannableString = new SpannableString(selectedText);

// 创建AlignmentSpan对象，设置对齐方式为居中对齐
AlignmentSpan alignmentSpan = new AlignmentSpan.Standard(Layout.Alignment.ALIGN_CENTER);

// 将AlignmentSpan应用到SpannableString对象
spannableString.setSpan(alignmentSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

// 将SpannableString对象设置到EditText中
editText.setText(spannableString);