如何将活动 1 /片段 A 中包含的数据传递到活动 1 / 片段 B，然后将其传递给活动 2

Question

我正在开发一个包含2个活动的应用程序。在我的活动1中，我有一个导航拖曳器，其中包含碎片。我在2个片段中有微调器。我想将片段1的数据和片段2的数据传递给片段3（仍然在同一活动中），然后编写一个按钮，将片段3中收集的数据发送到活动2。我可以将数据从活动 1 传递到活动 2，没有 Pb，但我不知道如何从片段检索数据，然后将其传递给活动 2。我是片段中的新手....我的一个片段的代码，包括旋转器：public static TypeInterventionFragment newInstance() {return (new TypeInterventionFragment()); }    @Override    public View  onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        // Inflate the layout for this fragment        View view= inflater.inflate(R.layout.fragment_type_intervention, container, false);        mSpinner1 = (Spinner) view.findViewById(R.id.spinner1);        mSpinner2 = (Spinner) view.findViewById(R.id.spinner2);        mSpinner3 = (Spinner) view.findViewById(R.id.spinner3);}我想从这些微调器中获取选定的项目，显示在包含Textview的片段中，然后通过按按钮将这些数据传递给另一个活动。如果你知道如何做，你可能会救我的生命，哈哈，我从2个月开始就在工作感谢很多和我的法国朋友： Merci les amis si vous pouvez m'aider !!!

Answer 1

每当您在活动上实例化片段时，都可以保留指向它们的链接。假设您的 ActivityA 和片段创建块如下所示：

public class ActivityA extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        FragmentTransaction fragmentTransactionA = getSupportFragmentManager().beginTransaction();

        fragmentTransactionA.replace(R.id.yourFragmentAContainerID, new FragmentA(), "fragmentA");

        fragmentTransactionA.commit();

        FragmentTransaction fragmentTransactionB = getSupportFragmentManager().beginTransaction();

        fragmentTransactionB.replace(R.id.yourFragmentBContainerID, new FragmentB(), "fragmentB");

        fragmentTransactionB.commit();

    }

}

您可以为活动创建属性并为其分配新片段的值，而不是仅使用 或 ，从而有效地在 ActivityA 和片段之间创建链接。new FragmentA()new FragmentB()

public class ActivityA extends AppCompatActivity {

    private FragmentA fragmentA;

    private FragmentB fragmentB;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        FragmentTransaction fragmentTransactionA = getSupportFragmentManager().beginTransaction();

        fragmentA = new FragmentA();

        fragmentTransactionA.replace(R.id.yourFragmentAContainerID, fragmentA, "fragmentA");

        fragmentTransactionA.commit();

        FragmentTransaction fragmentTransactionB = getSupportFragmentManager().beginTransaction();

        fragmentB = new FragmentB();

        fragmentTransactionB.replace(R.id.yourFragmentBContainerID, fragmentB, "fragmentB");

        fragmentTransactionB.commit();

    }

}

也就是说，现在您可以随时在活动时从片段中获取变量。假设您想要获取片段 A 的“propertyX”和片段 B 的“属性Y”，您现在可以在更改为 ActivityB 之前调用 和 您的活动，只要您已经拥有这些方法，并且它们是公共的。这只是一个示例，因为我们没有关于您的问题的所有代码，因此我冒昧地创建了一个示例类。fragmentA.getPropertyX()fragmentB.getPropertyY()

如果您仍然需要帮助，请进来。

Answer 2

在片段之间进行通信的推荐方法是创建一个共享的视图模型对象。

这是来自 Developer.android.com 的链接：

与其他片段|通信安卓开发者

您应该寻找的是使用活动作为片段之间的桥梁。使用接口是常见的做法。

Answer 3

非常感谢，这是我的主要活动的代码：

//FOR DESIGN

private Toolbar toolbar;

private DrawerLayout drawerLayout;

private NavigationView navigationView;

//FOR FRAGMENTS

private Fragment fragmentIntro;

private Fragment fragmentPhoto;

private Fragment fragmentProfile;

private Fragment fragmentDossier;

private Fragment fragmentDate;

private Fragment fragmentZone;

private Fragment fragmentTypeIntervention;

//FOR DATAS

private static final int FRAGMENT_INTRO = 0;

private static final int FRAGMENT_PHOTO = 1;

private static final int FRAGMENT_PROFILE = 2;

private static final int FRAGMENT_DOSSIER = 3;

private static final int FRAGMENT_DATE = 4;

private static final int FRAGMENT_ZONE = 5;

private static final int FRAGMENT_TYPE_INTERVENTION = 6;

// FOR STRINGS

private static TextView mFragmentPageNewsTitle;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    // Configure all views

    this.configureToolBar();

    this.configureDrawerLayout();

    this.configureNavigationView();

    // Show First Fragment

    this.showFirstFragment();

}

@Override

public void onBackPressed() {

    // Handle back click to close menu

    if (this.drawerLayout.isDrawerOpen(GravityCompat.START)) {

        this.drawerLayout.closeDrawer(GravityCompat.START);

    } else {

        super.onBackPressed();

    }

}

@Override

public boolean onNavigationItemSelected(MenuItem item) {

    int id = item.getItemId();

    // Show fragment after user clicked on a menu item

    switch (id){

        case R.id.activity_main_drawer_intro :

            this.showFragment(FRAGMENT_INTRO);

            break;

        case R.id.activity_main_drawer_photo :

            this.showFragment(FRAGMENT_PHOTO);

            break;

        case R.id.activity_main_drawer_profile:

            this.showFragment(FRAGMENT_PROFILE);

            break;

        case R.id.activity_main_drawer_dossier:

            this.showFragment(FRAGMENT_DOSSIER);

            break;

        case R.id.activity_main_drawer_date:

            this.showFragment(FRAGMENT_DATE);

            break;

        case R.id.activity_main_drawer_zone:

            this.showFragment(FRAGMENT_ZONE);

            break;

        case R.id.activity_main_drawer_typeintervention:

            this.showFragment(FRAGMENT_TYPE_INTERVENTION);

            break;

        default:

            break;

    }

    this.drawerLayout.closeDrawer(GravityCompat.START);

    return true;

}

// ---------------------

// CONFIGURATION

// ---------------------

// Configure Toolbar

private void configureToolBar(){

    this.toolbar = (Toolbar) findViewById(R.id.activity_main_toolbar);

    setSupportActionBar(toolbar);

}

// Configure Drawer Layout

private void configureDrawerLayout(){

    this.drawerLayout = (DrawerLayout) findViewById(R.id.activity_main_drawer_layout);

    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);

    drawerLayout.addDrawerListener(toggle);

    toggle.syncState();

}

// Configure NavigationView

private void configureNavigationView(){

    this.navigationView = (NavigationView) findViewById(R.id.activity_main_nav_view);

    navigationView.setNavigationItemSelectedListener(this);

}

// ---------------------

// FRAGMENTS

// ---------------------

// Show first fragment when activity is created

private void showFirstFragment(){

    Fragment visibleFragment = getSupportFragmentManager().findFragmentById(R.id.activity_main_frame_layout);

    if (visibleFragment == null){

        // Show Photo Fragment

        this.showFragment(FRAGMENT_INTRO);

        // Mark as selected the menu item corresponding to PhotoFragment

        this.navigationView.getMenu().getItem(0).setChecked(true);

    }

}

// Show fragment according an Identifier

private void showFragment(int fragmentIdentifier){

    switch (fragmentIdentifier){

        case FRAGMENT_INTRO :

            this.showIntroFragment();

            break;

        case FRAGMENT_PHOTO :

            this.showPhotoFragment();

            break;

        case FRAGMENT_PROFILE:

            this.showProfileFragment();

            break;

        case FRAGMENT_DOSSIER:

            this.showClientsFragment();

            break;

        case FRAGMENT_DATE:

            this.showDateFragment();

            break;

        case FRAGMENT_ZONE:

            this.showZoneFragment();

            break;

        case FRAGMENT_TYPE_INTERVENTION:

            this.showTypeInterventionFragment();

            break;

        default:

            break;

    }

}

// ---

// Create each fragment page and show it

private void showIntroFragment() {

    if (this.fragmentIntro == null) this.fragmentIntro = IntroFragment.newInstance();

    this.startTransactionFragment(this.fragmentIntro);

}

private void showPhotoFragment(){

    if (this.fragmentPhoto == null) this.fragmentPhoto = PhotoFragment.newInstance();

    this.startTransactionFragment(this.fragmentPhoto);

}

private void showClientsFragment(){

    if (this.fragmentDossier == null) this.fragmentDossier = DossierFragment.newInstance();

    this.startTransactionFragment(this.fragmentDossier);

}

private void showProfileFragment(){

    if (this.fragmentProfile == null) this.fragmentProfile = ProfileFragment.newInstance();

    this.startTransactionFragment(this.fragmentProfile);

}

private void showDateFragment(){

    if (this.fragmentDate == null) this.fragmentDate = DateFragment.newInstance();

    this.startTransactionFragment(this.fragmentDate);

}

private void showZoneFragment(){

    if (this.fragmentZone == null) this.fragmentZone = ZoneFragment.newInstance();

    this.startTransactionFragment(this.fragmentZone);

}

private void showTypeInterventionFragment(){

    if (this.fragmentTypeIntervention == null) this.fragmentTypeIntervention = TypeInterventionFragment.newInstance();

    this.startTransactionFragment(this.fragmentTypeIntervention);

}

// ---

// Generic method that will replace and show a fragment inside the MainActivity Frame Layout

private void startTransactionFragment(Fragment fragment){

    if (!fragment.isVisible()){

        getSupportFragmentManager().beginTransaction()

                .replace(R.id.activity_main_frame_layout, fragment).commit();

    }

}

}