Android中实现EditText密码显示隐藏的方法

<android.support.design.widget.textinputlayout
  android:id="@+id/pwdlayout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  app:passwordtoggleenabled="true"
  >
  <edittext
  android:id="@+id/pwdedt"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:hint="@string/edt_pwd_hint"
  android:maxlines="1"
  android:inputtype="textpassword" />
 </android.support.design.widget.textinputlayout>