EditText设置点击按钮显示与隐藏密码

private void showOrHidePasswd() {
if (showOrHidePasswd) {
//设置EditText文本为可见的
et_bank_num.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
} else {
//设置EditText文本为隐藏的
et_bank_num.setTransformationMethod(PasswordTransformationMethod.getInstance());
}
showOrHidePasswd = !showOrHidePasswd;
et_bank_num.postInvalidate();
//切换后将EditText光标置于末尾
CharSequence charSequence = et_bank_num.getText();
if (charSequence instanceof Spannable) {
Spannable spanText = (Spannable) charSequence;
Selection.setSelection(spanText, charSequence.length());
}
}