Android ViewPager内部的片段不存在'；卷轴

我有一个

活动

，它有一个

appBarLayout

，带有一个

表格布局

，应该覆盖屏幕的2/5，所以它是一个大的

appBarLayout

。我创建了它，制作了表格布局并配置了

viewPager

，它正在工作，但有三个问题我无法解决：

如果没有此

app:layout\u behavior=“@string/appbar\u scrolling\u view\u behavior”

视图页面将显示在

appbar布局旁边

每当我输入任何编辑文本时，AppBarLayout都会全屏显示

第二个片段有很大的高度，应该向下滚动，但第二个片段没有

相关代码：

使用

appBarLayout

和

viewPager

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/rootLayout"
    android:fitsSystemWindows="true"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <android.support.design.widget.AppBarLayout
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true">
            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:minHeight="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                >
                <TextView
                    android:id="@+id/title"
                    android:textSize="17sp"
                    android:text="@string/app_name"
                    android:textColor="@color/green_900"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </android.support.v7.widget.Toolbar>
        <ImageView
            android:id="@+id/img"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="center"
            android:src="@drawable/logo_home"
            android:fitsSystemWindows="true"
            />
        <TextView
            android:id="@+id/txt_version"
            android:text="@string/app_version"
            android:textColor="@color/white"
            android:textSize="10sp"
            android:layout_below="@+id/img_logo"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:gravity="center"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            app:tabMode="fixed"
            app:layout_collapseMode="pin"
            app:tabIndicatorHeight="3dp"
            app:tabIndicatorColor="@color/light_green_a700"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </android.support.design.widget.AppBarLayout>


    <android.support.v4.view.ViewPager
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@color/white_background" />

</android.support.design.widget.CoordinatorLayout>

public class LoginRegisterActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(new myFragmentPagerAdapter(getSupportFragmentManager(), LoginRegisterActivity.this));

        TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);
    }

    public class myFragmentPagerAdapter extends FragmentPagerAdapter {
        final int PAGE_COUNT = 2;
        private String tabTitles[] = new String[]{"Ingresar", "Registrarse"};
        private Context context;

        public myFragmentPagerAdapter(FragmentManager fm, Context context) {
            super(fm);
            this.context = context;
        }

        @Override
        public int getCount() {
            return PAGE_COUNT;
        }

        @Override
        public Fragment getItem(int position) {

            switch (position) {
                case 0:
                    return LoginFragment.newInstance(position);
                case 1:
                    return RegisterFragment.newInstance(position);
                default:
                    return null;
            }

        }

        @Override
        public CharSequence getPageTitle(int position) {
            // Generate title based on item position
            return tabTitles[position];
        }
    }

public class LoginRegisterActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setAdapter(new myFragmentPagerAdapter(getSupportFragmentManager(), LoginRegisterActivity.this));

        TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);
    }

    public class myFragmentPagerAdapter extends FragmentPagerAdapter {
        final int PAGE_COUNT = 2;
        private String tabTitles[] = new String[]{"Ingresar", "Registrarse"};
        private Context context;

        public myFragmentPagerAdapter(FragmentManager fm, Context context) {
            super(fm);
            this.context = context;
        }

        @Override
        public int getCount() {
            return PAGE_COUNT;
        }

        @Override
        public Fragment getItem(int position) {

            switch (position) {
                case 0:
                    return LoginFragment.newInstance(position);
                case 1:
                    return RegisterFragment.newInstance(position);
                default:
                    return null;
            }

        }

        @Override
        public CharSequence getPageTitle(int position) {
            // Generate title based on item position
            return tabTitles[position];
        }
    }