Question

我创建了一个带有可滑动视图的标签布局。我正在尝试从片段传递一个字符串碎片谢谢你提前 Details_customer.java

import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
public class Details_customer extends AppCompatActivity implements   Cust_Details_basic.FragmentDataListener {
SharedPreferences login_pref, IP;
private ProgressDialog pDialog;//For Loading activity..
Bundle dataBundle;
/**
 * The {@link 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 FragmentStatePagerAdapter}.
 */
private SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
private ViewPager mViewPager;
/**
 * ATTENTION: This was auto-generated to implement the App Indexing API.
 * See https://g.co/AppIndexing/AndroidStudio for more information.
 */
private GoogleApiClient client;




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

    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);

    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.
    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}


@Override
public void onFragmentDataUpdated(Bundle dataBundle)
{
    this.dataBundle=dataBundle;
}


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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_logout:
            login_pref = getSharedPreferences("Login Pref", MODE_PRIVATE);
            SharedPreferences.Editor editor = login_pref.edit();
            editor.putString("username", null);
            Intent intent = new Intent(this, MainActivity.class);
            intent.addCategory(Intent.CATEGORY_HOME);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            startActivity(intent);
            Toast.makeText(getApplicationContext(), "Logout", Toast.LENGTH_SHORT).show();
            /*editor.clear();*/
            editor.commit();
            finish();
            break;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * ATTENTION: This was auto-generated to implement the App Indexing API.
 * See https://g.co/AppIndexing/AndroidStudio for more information.
 */
public Action getIndexApiAction() {
    Thing object = new Thing.Builder()
            .setName("Details_customer Page") // TODO: Define a title for the content shown.
            // TODO: Make sure this auto-generated URL is correct.
            .setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
            .build();
    return new Action.Builder(Action.TYPE_VIEW)
            .setObject(object)
            .setActionStatus(Action.STATUS_TYPE_COMPLETED)
            .build();
}

@Override
public void onStart() {
    super.onStart();

    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.
    client.connect();
    AppIndex.AppIndexApi.start(client, getIndexApiAction());
}

@Override
public void onStop() {
    super.onStop();

    // ATTENTION: This was auto-generated to implement the App Indexing API.
    // See https://g.co/AppIndexing/AndroidStudio for more information.
    AppIndex.AppIndexApi.end(client, getIndexApiAction());
    client.disconnect();
}

//deleted

/**
 * 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) {
        switch (position) {
            case 0:
                Cust_Details_basic cust_basic = new Cust_Details_basic();
                cust_basic.setArguments(dataBundle);
                return cust_basic;
            case 1:
                Cust_Details_address address = new Cust_Details_address();
                address.setArguments(dataBundle);
                return address;
           /* case 2:
                Cust_Details_last details_last = new Cust_Details_last();
                return details_last;*/
        }
        return null;
    }

    @Override
    public int getCount() {
        // Show 2 total pages.
        return 2;
    }

    /***
     * new addition
     ***/
    public void showFragment(String val) {
        System.out.println(val);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Basic Info";
            case 1:
                return "Address";
           /* case 2:
                return "Address";*/
        }
        return null;
    }
}}

Cust_Details_basic.java这是我想要将值发送到下一个片段的Edittext

public class Cust_Details_basic extends Fragment {

EditText finame;
private ProgressDialog pDialog;//For Loading activity..

public interface FragmentDataListener{

    void onFragmentDataUpdated(Bundle dataBundle);

}
private FragmentDataListener mFragmentDataListener;
@Override

public void onAttach( Context context )
{
    super.onAttach( context );
    mFragmentDataListener=(FragmentDataListener)getActivity();
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.details_customer_1, container, false);
    finame = (EditText)view.findViewById(R.id.fname);
   /**********************************************/
    Bundle bundle = new Bundle();
    bundle.putString("fname",finame.getText().toString());
    mFragmentDataListener.onFragmentDataUpdated(bundle);
     /*********************************************/
    return view;
}}

这里是Cust_Details_address.java，我想要Edittext值

public class Cust_Details_address extends Fragment implements View.OnClickListener{

Button btnsubmit;
String fname,firstname;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.details_customer_2, container, false);


    Bundle bundle = this.getArguments();

            if (bundle != null) {
                firstname = bundle.getString("fname",fname);

                Toast.makeText(getActivity().getApplicationContext(),"fname:"+firstname,Toast.LENGTH_SHORT).show();
                Log.d("First Name:","=======>"+firstname);

            }
            else{
                Toast.makeText(getActivity().getApplicationContext(),"Am Empty:",Toast.LENGTH_SHORT).show();
            }


    btnsubmit = (Button)view.findViewById(R.id.btnsubmit);
    btnsubmit.setOnClickListener(this);

    return view;
}}

Answer 1

在您的活动定义接口，bundle对象中，然后使用片段中的数据调用Activity实例的接口方法：

在 Details_customer 活动中，您可以执行此操作，

  public class Details_customer extends AppCompatActivity 
    implements Cust_Details_basic.FragmentDataListener {

        SharedPreferences login_pref,IP;
        private ProgressDialog pDialog;//For Loading activity..
        Bundle dataBundle;

        ..... other code

    // override method of interface

    @override void onFragmentDataUpdated(Bundle dataBundle)
    {

       this.dataBundle=dataBundle;
    }
    ...... other code
    // in SectionsPagerAdapter adapter
          @Override public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    Cust_Details_basic cust_basic = new Cust_Details_basic();
                    cust_basic.setArguments(dataBundle); // remember to update
                                                        //bundle object as per requirement
                    return cust_basic;
                case 1:
                    Cust_Details_address address = new Cust_Details_address();
                    address.setArguments(dataBundle);
                    return address;


     /* case 2:
                        Cust_Details_last details_last = new Cust_Details_last();

                        return details_last;*/
                }
                return null;
            }

在 Cus_Details_basic 片段中，声明界面：

public class Cust_Details_basic extends Fragment {

    public interface FragmentDataListener{

    void onFragmentDataUpdated(Bundle dataBundle);

    }

private FragmentDataListener mFragmentDataListener;


// create fragment object and initialize it in onAttach()

@Override public void onAttach( Context context )
    {
        super.onAttach( context );


        mFragmentDataListener=(FragmentDataListener)getActivity();


    }

// then update your onCreate as:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.details_customer_1, container, false);
    Fragment fragment = new Fragment();
    Bundle bundle = new Bundle();
    bundle.putString("fname",fname);
    //fragment.setArguments(bundle);
    mFragmentDataListener.onFragmentDataUpdated(bundle);
    // this will update dataBundle object in your activity
return view;
}

这将调用onFragmentDataUpdated()课程的Details_customer，该课程将更新其dataBundle对象，现在只要Viewpager更改，您就可以setArguments()使用此Bundle对象，并且该片段的getArguments()中的onCreate最终将能够检索数据。

有用的链接：

Communicating between Fragments.

How To Communicate Between Fragments and Activities in Android.

Answer 2

建议使用

CallBacks（接口）和 Bundles ，但这是一个快速解决方案：

<强> YourActivity：

 public void randomMethod(String val){
 System.out.println(val);
}

<强>片段1：

onClick(){
 ((YourActivity) getActivity()).randomMethod(yourString1);
 }

<强> Fragment2：

onClick(){
 ((YourActivity) getActivity()).randomMethod(yourString2);
 }

您可以从活动的任何片段调用该方法并使用更新的值。

Answer 3

由于所有片段都在视图分页器中，这意味着它们共享相同的活动。因此，只需将值放在intent中，并将其放入该视图分页器的任何片段中，无需在bundle中单独传递数据。

在Cust_Details_basic片段中（将其另存为）

getActivity().getIntent().putExtra("name",fname);

在Cust_Details_address片段中（得到它）

String fname = getActivity().getIntent().getStringExtra("name");

Answer 4

在Cust_Details_address.java中我覆盖了这样的方法

@Override
public void onStart(){
    super.onStart();

    btnsubmit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
        String firstname = ((EditText)getActivity().findViewById(R.id.fname)).getText().toString();
        Toast.makeText(getActivity().getApplicationContext(),"Hi "+firstname ,Toast.LENGTH_SHORT).show();
        }    });

我得到了我接受的结果。非常感谢'Talha'的帮助。

使用Android中的可滑动视图的选项卡布局将数据从片段发送到片段

4 个答案: