在android默认选项卡式活动中,片段不适合屏幕高度和actionBar可移动

Question

我只是创造了一个TabbedActivity上Android Studio 1.5.1.我没有更改任何代码,但Fragment不适合屏幕高度和ActionBar可移动.

Views在底部是看不见的.我需要ActionBar向上移动以查看底部视图.(请参阅视频:视频)

所以,我有两个问题:

1. 在我投入ListView之后Fragment,ActionBar当用户滚动时我怎样才能顺利移动ListView？(WhatsApp和Viber正在使用这种技术)

2.如何防止ActionBar移动并对齐Fragment屏幕底部？

这是Main Activityandroid创建的:

public class MainActivity extends AppCompatActivity {

/**
 * The {@link android.support.v4.view.PagerAdapter} that will provide
 * fragments for each of the sections. We use a
 * {@link FragmentPagerAdapter} derivative, which will keep every
 * loaded fragment in memory. If this becomes too memory intensive, it
 * may be best to switch to a
 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
 */
private SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
private ViewPager mViewPager;

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

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

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    public PlaceholderFragment() {
    }

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        TextView textView = (TextView) rootView.findViewById(R.id.section_label);
        textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
        return rootView;
    }
}

/**
 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return PlaceholderFragment.newInstance(position + 1);
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "SECTION 1";
            case 1:
                return "SECTION 2";
            case 2:
                return "SECTION 3";
        }
        return null;
      }
   }
}

activity_main.xml中:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.eren.siiilllfdjfds.MainActivity">

    <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: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" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

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

编辑:

我想我需要更改这行容器:

app:layout_behavior="@string/appbar_scrolling_view_behavior"

编辑2:当我删除我在1.编辑中提到的代码时,片段对齐到底部但片段的开始对齐到屏幕顶部,我的意思是片段落后actionBar.

Answer 1

我正在运行Android 2,所以我不确定这是否适用于1.5.

在主要活动xml内部,由Android自动生成的工具栏小部件:

<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">

当我删除此行时:

        app:layout_scrollFlags="scroll|enterAlways"

......所有问题都消失了.

屏幕不再滚动,屏幕高度计算正确,因此您可以查看显示在内的所有视图(片段或活动)

所以我会集中精力研究这条线:

    app:layout_scrollFlags="scroll|enterAlways"

Answer 2

放入fragment后，当用户滚动listView时ListView如何平滑向上移动？ActionBar（WhatsApp 和 Viber 正在使用这种技术）

首先，更好/或者让我们说你必须使用RecyclerView：

app:layout_behavior="@string/appbar_scrolling_view_behavior"

正如这里提到的：（在下面添加）

https://github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout#responding-to-scroll-events

关于这样的设计WhatsApp，我使用了以下代码：

<android.support.design.widget.CoordinatorLayout
        android:id="@+id/root_coordinator"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <android.support.design.widget.TabLayout
                android:id="@+id/tab_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="?attr/colorPrimary"
                android:minHeight="?attr/actionBarSize"
                app:tabIndicatorColor="#ffffff"
                app:tabIndicatorHeight="4dp"
                app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

            <android.support.v4.view.ViewPager
                android:id="@+id/pager"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

        </LinearLayout>

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:elevation="0dp">

            <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"
                app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

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

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="@dimen/fab_margin"
            android:src="@drawable/ic_send_white_18dp"
            app:backgroundTint="@color/colorAccent" />

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

当我删除我在 1.edit 中提到的代码时，片段对齐到底部，但片段的开头对齐到屏幕顶部，我的意思是片段位于 actionBar 后面。

您必须添加：

app:layout_behavior="@string/appbar_scrolling_view_behavior"

用于使用下面的内容并AppBarLayout修复所有内容。

请参阅： https: //github.com/codepath/android_guides/wiki/Handling-Scrolls-with-CoordinatorLayout#responding-to-scroll-events

其中说：

注意：根据 Google 官方文档，AppBarLayout 目前预计是嵌套在 CoordinatorLayout 中的第一个子级。

接下来，我们需要定义和将要滚动的之间的关联。AppBarLayoutView将 an 添加app:layout_behavior到 RecyclerView或任何其他View具有功能的内容，nested scrolling例如 NestedScrollView。支持库包含一个 resource @string/appbar_scrolling_view_behavior映射到 的 特殊字符串AppBarLayout.ScrollingViewBehavior，用于通知 AppBarLayout该特定视图上何时发生滚动事件。行为必须建立在触发事件的视图上。

编辑：如果您需要将其固定Toolbar在那里，只需使用：

app:layout_collapseMode="pin"

最后：

       <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_collapseMode="pin">