如何getText（）从EditText选项卡片段

Question

我是一个新的Android开发人员和Java编程的初学者。我正在开发拼车应用程序，但发生了一些问题。我在3页上使用了选项卡活动，但只有一个正在给我带来麻烦。我想检索EditText数据，当我点击一个浮动操作按钮时，但没有任何工作。

编辑：问题加入PlaceholderFragment frag = (PlaceholderFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.containerNovo + ":" + mViewPager.getCurrentItem());，其中containerNovo是我ViewPager mViewPager的ID解决。

我主要的XML文件：

<?xml version="1.0" encoding="utf-8"?> 

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

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

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

<android.support.v4.view.ViewPager 
    android:id="@+id/containerNovo" 
    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/fabNovo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="end|bottom" 
    android:layout_margin="@dimen/fab_margin" 
    android:src="@drawable/check" /> 

我主要的Java代码：

package petma.testesappcarona; 

public class NovaCarona extends AppCompatActivity { 

private SectionsPagerAdapter mSectionsPagerAdapter; 
FloatingActionButton fab; 

private ViewPager mViewPager; 

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

    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.containerNovo); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 

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

    fab = (FloatingActionButton) findViewById(R.id.fabNovo); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Toast.makeText(NovaCarona.this, "input_nome.getText().toString()", Toast.LENGTH_SHORT).show(); 
     } 
    }); 

} 

片段代码：

/** 
* A placeholder fragment containing a simple view. 
*/ 
public static class PlaceholderFragment extends Fragment implements View.OnClickListener { 
    /** 
    * The fragment argument representing the section number for this 
    * fragment. 
    */ 
    private static final String ARG_SECTION_NUMBER = "section_number"; 
    EditText input_nome,input_data, input_horario, input_saida, input_chegada, input_Recado; 
    Spinner input_pessoas; 
    SessionManager session; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.fragment_nova_carona, container, false); 
     session = new SessionManager(getContext()); 
     session.checkLogin(); 
     input_data = (EditText)rootView.findViewById(R.id.input_data); 
     assert input_data != null; 
     input_data.setOnClickListener(this); 

     input_horario = (EditText) rootView.findViewById(R.id.input_horario); 
     assert input_horario != null; 
     input_horario.setOnClickListener(this); 

     input_chegada = (EditText)rootView.findViewById(R.id.input_chegada); 
     input_saida = (EditText)rootView.findViewById(R.id.input_saida); 
     input_nome = (EditText)rootView.findViewById(R.id.input_nome); 
     input_pessoas = (Spinner)rootView.findViewById(R.id.input_pessoas); 
     input_Recado = (EditText) rootView.findViewById(R.id.input_Recado); 

     ((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayShowHomeEnabled(true); 
     ((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     return rootView; 
    } 

    @Override 
    public void onClick(View view) { 
     if (view == input_data){ 
      int mYear, mMonth, mDay; 
       // Get Current Date 
       final Calendar c = Calendar.getInstance(); 
       mYear = c.get(Calendar.YEAR); 
       mMonth = c.get(Calendar.MONTH); 
       mDay = c.get(Calendar.DAY_OF_MONTH); 


       DatePickerDialog datePickerDialog = new DatePickerDialog(getContext(), 
         new DatePickerDialog.OnDateSetListener() { 

          @Override 
          public void onDateSet(DatePicker view, int year, 
                int monthOfYear, int dayOfMonth) { 

           input_data.setText(year + "-" + (monthOfYear + 1) + "-" + dayOfMonth); 

          } 
         }, mYear, mMonth, mDay); 
       datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000); 
       datePickerDialog.show(); 
     } 
     else if (view == input_horario){ 
      int mHour, mMinute; 
      final Calendar c = Calendar.getInstance(); 
      mHour = c.get(Calendar.HOUR_OF_DAY); 
      mMinute = c.get(Calendar.MINUTE); 

      // Launch Time Picker Dialog 
      TimePickerDialog timePickerDialog = new TimePickerDialog(getContext(), 
        new TimePickerDialog.OnTimeSetListener() { 

         @Override 
         public void onTimeSet(TimePicker view, int hourOfDay, 
               int minute) { 
          if(minute <= 9){ 
           input_horario.setText(hourOfDay + ":"+"0"+minute); 
          } 
          else{ 
           input_horario.setText(hourOfDay + ":" + minute); 
          } 
         } 
        }, mHour, mMinute, false); 
      timePickerDialog.show(); 
     } 
    } 
} 

我想替换“input_nome.getText（）。toString（）”部分。我试图使用PlaceholderFragment，但我不知道该片段的ID是什么。我没有找到人们使用PlaceholderFragment和Tabbed Activity的代码。

Answer 1

你需要重写你的标签适配器的getItem（）方法，以检索在该选项卡添加的片段的一个实例，所以你可以调用从检索您从EDITTEXT

文本片段的方法

public class TabAdapter extends FragmentStatePagerAdapter { 
    private final List<Fragment> fragments = new ArrayList<>(); 
    private final List<String> fragmentsTitles = new ArrayList<>(); 
    private Context context; 

    public TabAdapter (FragmentManager fm, Context context) { 
     super(fm); 
     this.context = context; 
    } 

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

    . 
    . 
    . 

}

adapter.getItem(position).getEditTextString(); 

Answer 2

问题通过增加解决：PlaceholderFragment frag = (PlaceholderFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.containerNovo + ":" + mViewPager.getCurrentItem()); , where containerNovo is the id of my ViewPager mViewPager.，其中containerNovo是我ViewPager mViewPager的ID。