Question

我正在开发一个具有标签活动的Android应用程序。在此活动中，还有四个标签是使用Fragments创建的。现在我想从主标签activity.i中的片段标签中获取数据。很多，但没有找到确切的答案。如果有任何可以解决这个问题。下面是我的代码

主要标签活动

public class TabedActivity extends ActionBarActivity {

    // Declaring Your View and Variables
    MobileServiceClient MSC;
    MobileServiceTable MST;

    Toolbar toolbar;
    ViewPager pager;
    ViewPagerAdapter adapter;
    SlidingTabLayout tabs;
    CharSequence Titles[]={"Basic","Education","Profession","Experiance"};
    int Numboftabs =4;




    @Override
    protected void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tabed);

        // Creating The Toolbar and setting it as the Toolbar for the activity

      //  toolbar = (Toolbar) findViewById(R.id.tool_bar);
        //setSupportActionBar(toolbar);


        // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
        adapter =  new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);

        // Assigning ViewPager View and setting the adapter
        pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(adapter);

        // Assiging the Sliding Tab Layout View
        tabs = (SlidingTabLayout) findViewById(R.id.tabs);
        tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width

        // Setting Custom Color for the Scroll bar indicator of the Tab View
        tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
            @Override
            public int getIndicatorColor(int position) {
                return getResources().getColor(R.color.tabsScrollColor);
            }
        });

        // Setting the ViewPager For the SlidingTabsLayout
        tabs.setViewPager(pager);
    }






    @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_tabed, 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.
        item.getItemId();
        switch (item.getItemId()) {
            case R.id.action_settings:
                goToHome();
                return true;
            case R.id.done:
                Toast.makeText(this, "you select done", Toast.LENGTH_SHORT).show();

                return true;



            default:
                return super.onOptionsItemSelected(item);
        }



        //noinspection SimplifiableIfStatement

    }
   public  void goToHome(){

       Intent gotohome=new Intent(this,MapsActivity.class);
       startActivity(gotohome);
   }
    //the following function was added to update but not working

public static void settingValues(){

和Tab活动

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.Toast;

/**
 * Created by hp1 on 21-01-2015.
 */
public class Tab1 extends Fragment {


    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View v =inflater.inflate(R.layout.tab_1,container,false);

        EditText contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
        EditText address= (EditText)v.findViewById(R.id.editText2);

        contactNumber.setHint("Your ContactNo Plz");
        address.setHint("Your address Plz");

        return v;
    }
}

查看页面适配器类

public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created
    int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created


    // Build a Constructor and assign the passed Values to appropriate values in the class
    public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
        super(fm);

        this.Titles = mTitles;
        this.NumbOfTabs = mNumbOfTabsumb;

    }

    //This method return the fragment for the every position in the View Pager
    @Override
    public Fragment getItem(int position) {

        if(position == 0) // if the position is 0 we are returning the First tab
        {
            Tab1 tab1 = new Tab1();
            return tab1;
        }
        else if (position==1){

            Tab2 tab2 = new Tab2();
            return tab2;
        }
        else if (position==2){
            Tab3 tab3 = new Tab3();
            return tab3;
        }

        else             // As we are having 2 tabs if the position is now 0 it must be 1 so we are returning second tab
        {
          Tab4 tab4=new Tab4();
            return tab4;
        }


    }

    // This method return the titles for the Tabs in the Tab Strip

    @Override
    public CharSequence getPageTitle(int position) {
        return Titles[position];
    }

    // This method return the Number of tabs for the tabs Strip

    @Override
    public int getCount() {
        return NumbOfTabs;
    }
}

Answer 1

修改为了引用您的观点，您应该在view(s)级别声明class，例如

public class Tab1 extends Fragment { EditTex address,contactNumber; @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View v =inflater.inflate(R.layout.tab_1,container,false); contactNumber= (EditText)v.findViewById(R.id.editTextcontact); address= (EditText)v.findViewById(R.id.editText2); contactNumber.setHint("Your ContactNo Plz"); address.setHint("Your address Plz"); return v; } public String getData(){ return address.getText().toString(); } }

首先声明一个全局变量以维持对正在显示的currentPage的引用

int currentPage = 0; // 0 - 因为最初显示第0页。

您可以使用以下方法引用Fragment：

private static String makeFragmentName(int viewPagerId, int index) { return "android:switcher:" + viewPagerId + ":" + index; }
上述viewPagerId中的
是您的ViewPager's id

您需要在current page和implement addOnPageChangeListener()方法中为ViewPager显示onPageSelected()的参考号，并更新您的currentPage变量。< / p>
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { currentPage = position; } @Override public void onPageScrollStateChanged(int state) { } });

现在，为了使用onOptionsItemSelected()方法获取数据，您可以执行以下操作

// You will need to check for the index manually and get the reference of the current `Fragment` so a solution to this can be like if(currentPage == 0){ Tab1 tab1 = (Tab1)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage)); // always check for null if(tab1 != null){ String data = tab1.getData(); } }else if(currentPage == 1){ Tab2 tab2 = (Tab2)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage)); if(tab2 != null){ String data = tab2.getData(); } } ... so on

在片段中创建方法以访问数据，例如

public String getData(){ String data = yourEditText.getText().toString(); return data; }

同样您也可以访问其他数据，如果您需要更多详细信息，请告诉我们

Answer 2

这只不过是nested fragment片段内部的基本片段（嵌套）是not supported。你做同样的事，Nested fragments are not currently supported。试图将片段放在另一个片段的UI中会导致应用程序的未定义和可能破坏的行为。

使用android中的片段从标签获取数据

2 个答案: