android - Login Screen concerns -


i'm creating login screen in android studio , decided going use login activity template. there no errors shown in code, concerns lie in emulator tells me.

the following classes not instantiated: - com.google.android.gms.common.signinbutton (open class, show exception) tip: use view.isineditmode() in custom views skip code or show sample data when shown in ide

<!-- login progress --> <progressbar android:id="@+id/login_progress" style="?android:attr/progressbarstylelarge"     android:layout_width="wrap_content" android:layout_height="wrap_content"     android:layout_marginbottom="8dp" android:visibility="gone" />  <scrollview android:id="@+id/login_form" android:layout_width="match_parent"     android:layout_height="match_parent">     <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content"         android:orientation="vertical">          <com.google.android.gms.common.signinbutton android:id="@+id/plus_sign_in_button"             android:layout_width="match_parent" android:layout_height="wrap_content"             android:layout_marginbottom="32dp" />          <linearlayout android:id="@+id/plus_sign_out_buttons"             android:layout_width="match_parent" android:layout_height="wrap_content"             android:visibility="gone" android:weightsum="2">              <button android:id="@+id/plus_sign_out_button" style="?android:textappearancesmall"                 android:layout_width="match_parent" android:layout_height="match_parent"                 android:layout_weight="1" android:text="@string/plus_sign_out" />              <button android:id="@+id/plus_disconnect_button"                 style="?android:textappearancesmall" android:layout_width="match_parent"                 android:layout_height="match_parent" android:layout_weight="1"                 android:text="@string/plus_disconnect" />          </linearlayout>          <linearlayout android:id="@+id/email_login_form" android:layout_width="match_parent"             android:layout_height="wrap_content" android:orientation="vertical">              <autocompletetextview android:id="@+id/email" android:layout_width="match_parent"                 android:layout_height="wrap_content" android:hint="@string/prompt_email"                 android:inputtype="textemailaddress" android:maxlines="1"                 android:singleline="true" />              <edittext android:id="@+id/password" android:layout_width="match_parent"                 android:layout_height="wrap_content" android:hint="@string/prompt_password"                 android:imeactionid="@+id/login"                 android:imeactionlabel="@string/action_sign_in_short"                 android:imeoptions="actionunspecified" android:inputtype="textpassword"                 android:maxlines="1" android:singleline="true" />              <button android:id="@+id/email_sign_in_button" style="?android:textappearancesmall"                 android:layout_width="match_parent" android:layout_height="wrap_content"                 android:layout_margintop="16dp" android:text="@string/action_sign_in"                 android:textstyle="bold" />          </linearlayout>     </linearlayout> </scrollview>

with reference com.google.android.gms.common.signinbutton, trying use google play services api. did add google play services sdk project.

refer to adding google play services sdk android project


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