EditText

<edittext
android:id="@+id/et_2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textcolor="#ffc107"
android:layout_below="@id/et_1"
android:layout_margintop="10dp"
android:textsize="20sp"
android:drawableleft="@drawable/passwor"
android:drawablepadding="10dp"
android:hint="密码"
android:maxlength="1"
android:inputtype="textpassword"*显示
android:inputtype="number" 呼出数字键
android:background="@drawable/bg_username"
android:paddingleft="10dp"
/>
监控edittext输入（可以再logcat中看到输入）
metusername=findviewbyid(r.id.et_1);
metusername.addtextchangedlistener(new textwatcher() {
@override
public void beforetextchanged(charsequence s, int start, int count, int after) {

}

@override
public void ontextchanged(charsequence s, int start, int before, int count) {
log.d("edittext",s.tostring());
}

@override
public void aftertextchanged(editable s) {

}