导致操作栏选项卡中的活动

Posted 2023-04-19

【中文标题】导致操作栏选项卡中的活动

【英文标题】：Cause activity in actionbar tabs

【发布时间】：2016-12-22 09:53:27

【问题描述】：

我使用操作栏选项卡 android studio，他的 div 部分，我想要那个触摸部分，我会导致滚动活动！我不想处理片段，我想在我的部分滚动活动中看到。

请帮忙，因为长时间坐在这个麻烦中。

这就是我想要实现的目标：

MainActivity.java:

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 4;
    

    @Override
    public CharSequence getPageTitle(int position) 
      switch (position) 
        case 0:
          return "SECTION 1";
        case 1:
          return "SECTION 2";
        case 2:
          return "SECTION 3";
        case 3:
          return "Секція 4";
      
      return null;
    
  

ma​​in_activity.xml：

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_
    android:layout_
    android:fitsSystemWindows="true"
    tools:context="com.vladislav.scrolable.MainActivity">

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

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_
            android:layout_
            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_
            android:layout_ />

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

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

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

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

fragment_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.vladislav.scrolable.MainActivity$PlaceholderFragment">

    <TextView
        android:id="@+id/section_label"
        android:layout_
        android:layout_ />

    <ScrollView
        android:layout_
        android:layout_
        android:id="@+id/scrollView"
        android:layout_centerVertical="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

【问题讨论】：

activity 中的activity是不可能的。

为什么？翻转部分它的事件？是的？也许我们有事件可以做调用（原因）动作？

这种场景你必须使用fragment，而且为什么你需要一个activity里面的activity？

“你必须在这种情况下使用片段，而且为什么你需要一个活动内部的活动？”因为在这部分我的应用程序将更多关于健康的文本。我可以处理片段和文本视图，但在我看来，在这种情况下滚动活动会更好

而你（himanshu1496）认为actionbar导致滚动活动不可能？

【参考方案1】：

在 git 中修改您的代码后，我们可以通过将 fragment_main.xml 更改为：

<RelativeLayout 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:layout_
    android:layout_
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.vladislav.scrolable.MainActivity$PlaceholderFragment"
    >


  <android.support.v4.widget.NestedScrollView
      android:id="@+id/scrollView"
      android:layout_
      android:layout_
      app:layout_behavior="@string/appbar_scrolling_view_behavior"
      >


    <TextView
        android:id="@+id/section_label"
        android:layout_
        android:layout_
        />

  </android.support.v4.widget.NestedScrollView>

</RelativeLayout>

我们必须将NestedScrollView的layout_width和layout_height设置为match_parent，这样我们在向上滚动TextView时才能滚动布局。

记住我们需要在NestedScrollView中添加如下代码：

app:layout_behavior="@string/appbar_scrolling_view_behavior"

通知AppBarLayout有关滚动。

请在我在my Scrolable github 中编辑后查看您的 Scrolable 项目。

向上滚动后的示例图片：