如何將片段添加到ViewPager？ addView崩潰我的應用程序

Question

我正在使用Android啟動新Android應用程序時啟動的默認滑動選項卡片段代碼。 我已經弄清楚如何修改我的數據並使用選項卡，但我還沒弄清楚如何將一個簡單的片段添加到已經存在的內容中。 我想在標簽的頂部或正下方添加一個信息欄。 我確定這很簡單，我只是無法弄清楚怎么哈哈。 我通過例子學習。

我已經嘗試為viewpager添加一個視圖，但我的應用程序崩潰了，我相信我做錯了。

在我的MainActivity中：...

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Set up the action bar.
    final ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    mSectionsPagerAdapter = new SectionsPagerAdapter(
            getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);
    SubBarFragment infobar = new SubBarFragment();
    mViewPager.addView(infobar.getView());      
.....[extra code for menus and things]

public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
....[code to show specific tabs and return the tab's fragment]

infobarfragment.java

public class InfobarFragment extends Fragment {

      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
          Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.infobar, container, false);
        return view;
      }

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" />

infobar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_wifi" />

    <TextView
        android:id="@+id/statusText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Wifi Status Information" />

</LinearLayout>

Answer 1

你可以遵循這種方法：

只需在尋呼機中為每個視圖使用片段。

在FragmentActivity onCreate()方法中編寫以下代碼。

List<Fragment> fragments = new Vector<Fragment>();

//for each fragment you want to add to the pager
Bundle page = new Bundle();
page.putString("url", url);
fragments.add(Fragment.instantiate(this,MyFragment.class.getName(),page));

//after adding all the fragments write the below lines

this.mPagerAdapter  = new PagerAdapter(super.getSupportFragmentManager(), fragments);

mPager.setAdapter(this.mPagerAdapter);

樣本片段定義：

public class MyFragment extends Fragment {


public static MyFragment newInstance(String imageUrl) {

final MyFragment mf = new MyFragment ();

    final Bundle args = new Bundle();
    args.putString("somedata", "somedata");
    mf.setArguments(args);

    return mf;
}

public MyFragment() {}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String data = getArguments().getString("somedata");
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // Inflate and locate the main ImageView
    final View v = inflater.inflate(R.layout.my_fragment_view, container, false);
    //... 
    return v;
}

FragmentPagerAdapter

public class MyFragmentAdapter extends FragmentPagerAdapter {

public static int pos = 0;

private List<Fragment> myFragments;

public MyFragmentAdapter(FragmentManager fm, List<Fragment> myFrags) {
    super(fm);
    myFragments = myFrags;
}

@Override
public Fragment getItem(int position) {

    return myFragments.get(position);

}

@Override
public int getCount() {

    return myFragments.size();
}

@Override
public CharSequence getPageTitle(int position) {

    setPos(position);

    String PageTitle = "";

    switch(pos)
    {
        case 0:
                PageTitle = "page 1";
                break;
        case 1:
                PageTitle = "page 2";
                break;
        case 2:
                PageTitle = "page 3";
                break;
        case 3:
                PageTitle = "page 4";
                break;
        case 4:
                PageTitle = "page 5";
                break;
        case 5: 
                PageTitle = "page 6";
                break;
        case 6:
                PageTitle = "page 7";
                break;
    }
    return PageTitle;
}

public static int getPos() {
    return pos;
}

 public static void setPos(int pos) {
    MyFragmentAdapter.pos = pos;
 }
}