CoordinatorLayout - match_parent 不起作用

Question

小而烦人的问题：

我制作了一个标签 Activity，其中标签包含一个 ListView。但是，如果我将 ViewPager 的尺寸设置为 match_parent，一切似乎都很好，BUT，在底部，ViewPager' s egde 离开屏幕。

像这样：link

结果：link

布局：

<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/main_content"
                                             android:layout_width="match_parent"
                                             android:layout_height="match_parent"
                                             android:fitsSystemWindows="true"
                                             tools:context="de.gymoth.goapp.vertretungsplan.VertretungsplanActivityNew">

<android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top"
        android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay"
            app:layout_scrollFlags="scroll|enterAlways">

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

    <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

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

<android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

Java:

public class VertretungsplanActivityNew extends AppCompatActivity {

private VertretungsplanFragment firstFragment;
private VertretungsplanFragment secondFragment;
private TabLayout tabLayout;

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

    firstFragment = VertretungsplanFragment.newInstance(0);
    secondFragment = VertretungsplanFragment.newInstance(1);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    ViewPager viewPager = (ViewPager) findViewById(R.id.container);
    viewPager.setAdapter(sectionsPagerAdapter);

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

public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch(position) {
            case 0:
                return firstFragment;
            case 1:
                return secondFragment;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return "";
    }
}

public void setTabTitle(int index, CharSequence title) {
    tabLayout.getTabAt(index).setText(title);
}
}

有人对此有解释吗？ 感谢任何帮助。

Answer 1

将CoordinatorLayout替换为LinearLayout，就可以正常工作了。我在下面添加了示例代码。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme.PopupOverlay">

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

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

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

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>

Answer 2

Roshan 的回答很好，除非您需要 CoordinatorLayout 的功能。在这种情况下，您可以采取简单的解决方法：

<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="48dp"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

CoordinatorLayout - match_parent 不起作用

CoordinatorLayout - match_parent doesn't work

android

android-coordinatorlayout