Quick sample layout for a login screen using support libraries

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView
        android:id="@+id/background"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <android.support.v7.widget.GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        app:columnCount="2"
        android:layout_gravity="center">

        <Button
            android:id="@+id/login_btn_google"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_columnWeight="1"
            android:text="Sign Up"
            android:drawableLeft="@drawable/ic_google"
            android:gravity="center"
            android:padding="16dp"
            app:backgroundTint="#dd4b39"
            style="@style/Widget.AppCompat.Button.Colored" />

        <Button
            android:id="@+id/login_btn_facebook"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_columnWeight="1"
            android:text="Sign Up"
            android:drawableLeft="@drawable/ic_facebook"
            android:gravity="center"
            android:padding="16dp"
            app:backgroundTint="#3b5998"
            style="@style/Widget.AppCompat.Button.Colored" />

        <android.support.v7.widget.CardView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_columnSpan="2"
            app:cardElevation="0dp"
            app:cardUseCompatPadding="true"
            app:cardBackgroundColor="#44ffffff">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="48dp"
                    android:layout_marginStart="16dp"
                    android:layout_marginEnd="16dp"
                    android:orientation="horizontal">

                    <ImageView
                        android:layout_width="24dp"
                        android:layout_height="24dp"
                        android:layout_gravity="center"
                        android:src="@drawable/ic_person_white_24dp"/>

                    <EditText
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_weight="1"
                        android:hint="Username"
                        android:layout_marginStart="16dp"
                        android:layout_marginEnd="16dp"
                        android:background="@null"
                        android:gravity="center_vertical"
                        android:textColorHint="@android:color/white"
                        android:textColor="@android:color/white"/>

                </LinearLayout>

                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="#88ffffff" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="48dp"
                    android:layout_marginStart="16dp"
                    android:layout_marginEnd="16dp"
                    android:orientation="horizontal">

                    <ImageView
                        android:layout_width="24dp"
                        android:layout_height="24dp"
                        android:layout_gravity="center"
                        android:src="@drawable/ic_lock_white_24dp"/>

                    <EditText
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_weight="1"
                        android:hint="Password"
                        android:layout_marginStart="16dp"
                        android:layout_marginEnd="16dp"
                        android:background="@null"
                        android:gravity="center_vertical"
                        android:textColorHint="@android:color/white"
                        android:textColor="@android:color/white"/>

                </LinearLayout>

            </LinearLayout>

        </android.support.v7.widget.CardView>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Create account"
            android:padding="16dp"
            app:layout_columnSpan="2"
            app:backgroundTint="@android:color/white"/>

    </android.support.v7.widget.GridLayout>

</FrameLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            Window w = getWindow();
            w.setFlags(
                    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
                    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
            );
        }

        setContentView(R.layout.activity_main);

        final ImageView background = (ImageView) findViewById(R.id.background);
        Picasso.with(this).load(R.drawable.bg).fit().centerCrop().into(background);

    }

}