我有两个问题/问题:)

首先:我已经实现了“滑动选项卡布局”。现在,该片段用于在底部截断选项卡:
Fragment gets cut off (FAB is on bottom|right)

第二:当我按下FAB时,我想打开一个新的Activity(FAB在一个片段上)。但是,当我按下它时,一个空白的“活动”将打开(实际的“活动”具有布局,并且正在单独运行),当我按下“后退”按钮时,我退出了该应用程序。

对于第一个问题:这是我在MainActivity的onCreate中调用的Methode(在其中实现了“滑动选项卡”布局)(我不知道您是否需要ViewPager的代码,因此,如果需要,我不包含它)请告诉我):

 private void excTasks(){
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(false);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    viewPager.setOffscreenPageLimit(4);
    setupViewPager(viewPager);

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


这是ViewPagerAdapter:

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        //return mFragmentTitleList.get(position);

        // Wenn man nur Icons will -> return null, sont das obrige verwenden
        return null;
    }
}


在这里添加片段:

private void setupViewPager(ViewPager viewPager) {

    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());

    adapter.addFragment(new NewsFragment(), "NEWS");
    adapter.addFragment(new ProfileFragment(), "PROFILE");
    adapter.addFragment(new NotificationFragment(), "NOTIF");
    adapter.addFragment(new AboutFragment(), "ABOUT");

    viewPager.setAdapter(adapter);
}


这是MainActivity的.xml:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context=".MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <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/ThemeOverlay.AppCompat.Light" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="fixed"
        app:tabGravity="fill"
        app:tabIndicatorColor="@color/white"/>
</android.support.design.widget.AppBarLayout>

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

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


对于第二个问题:
这是在片段(在onViewCreated中),我需要FAB(OfferActivity是按下按钮时应打开的位置):

//FAB
    FloatingActionButton fab = (FloatingActionButton) v.findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // Click action
            Intent intent = new Intent(con, OfferActivity.class);
            getActivity().startActivity(intent);
        }
    });


如前所述,OfferActivity在一个选项卡中显示时可以正常工作,因此我不会包含它的代码。
这是FAB xml(在RelativeLayout内部):编辑:包括了整个文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true">

<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@android:id/list"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp"
    android:layout_weight="0"
    android:layout_marginTop="5dp"
    android:foregroundGravity="fill"/>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="@dimen/fab_margin"
    android:layout_marginRight="@dimen/fab_margin"
    android:src="@drawable/fab_add"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:baselineAlignBottom="true"
    android:clickable="true"
    app:backgroundTint="@color/colorPrimary" />




感谢您的回答,如果对此问题已经提出,我们深表歉意! :)

编辑:这是styles.xml,我包括了整个FAB xml

<resources xmlns:tools="http://schemas.android.com/tools">

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:actionBarDivider">@color/colorPrimary</item>
    <!--<item name="android:windowTranslucentStatus" tools:targetApi="kitkat">true</item>-->
</style>

<style name="MyMaterialTheme" parent="AppTheme">
    <item name="android:windowContentTransitions" tools:targetApi="lollipop">true</item>
    <item name="android:windowAllowEnterTransitionOverlap" tools:targetApi="lollipop">true</item>
    <item name="android:windowAllowReturnTransitionOverlap" tools:targetApi="lollipop">true</item>
    <item name="android:windowSharedElementEnterTransition" tools:targetApi="lollipop">@android:transition/move</item>
    <item name="android:windowSharedElementExitTransition" tools:targetApi="lollipop">@android:transition/move</item>
</style>

最佳答案

我认为layout_baselineAlignBottom属性的使用造成了问题。 app:layout_anchor属性使我们能够指定要在其上锚定浮动动作按钮的布局,而app:layout_anchorGravity指定锚点的位置。将以下浮动操作按钮xml放在</android.support.design.widget.CoordinatorLayout>之前的末尾。

<android.support.design.widget.FloatingActionButton
   android:id="@+id/fab"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginBottom="@dimen/fab_margin"
   android:layout_marginRight="@dimen/fab_margin"
   android:src="@drawable/fab_add"
   android:layout_alignParentBottom="true"
   android:layout_alignParentRight="true"
   android:baselineAlignBottom="true"
   android:clickable="true"
   app:backgroundTint="@color/colorPrimary"
   app:layout_anchor="@id/viewpager"
   app:layout_anchorGravity="bottom|right|end"  />


请注意:“浮动操作”按钮只能与协调器布局一起使用。

编辑:好的,将您的相对布局包装在协调器布局中,然后进行更改
浮动操作按钮xml中的app:layout_anchor="@id/viewpager"app:layout_anchor="@id/listview"

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true">

<ListView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/list"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp"
    android:layout_weight="0"
    android:layout_marginTop="5dp"
    android:foregroundGravity="fill"/>


</RelativeLayout>
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:clickable="true"
    app:backgroundTint="@color/colorPrimary"
    app:layout_anchor="@id/list"
    android:src="@drawable/fab_add"
    android:layout_marginBottom="@dimen/fab_margin"
    android:layout_marginRight="@dimen/fab_margin"
    app:layout_anchorGravity="bottom|right|end"/>
</android.support.design.widget.CoordinatorLayout>

10-07 19:20
查看更多