在另一个片段的视图页面中显示片段

Question

您好，我正在使用 3 个片段（片段 A、B、C）在 viewpager 和选项卡中开发一个 Android 应用程序，viewpager 工作正常。片段 A 包含一个列表视图，当用户单击一个项目时，应用程序会打开一个片段对话框，其中包含有关所选项目的信息。此对话框有一个名为“添加到收藏夹”的按钮。现在我想在用户按下按钮时这样做：

1. 关闭片段对话框
2. 在视图分页器中显示片段 B
3. 将信息从对话片段发送到片段 B

我该怎么做？

这是我的代码的一部分：

* MainFragmentActivity *（这工作正常）

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

    // Set up the action bar.
    final ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // 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.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    // When swiping between different sections, select the corresponding
    // tab. We can also use ActionBar.Tab#select() to do this if we have
    // a reference to the Tab.
    mViewPager
            .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                @Override
                public void onPageSelected(int position) {
                    actionBar.setSelectedNavigationItem(position);
                }
            });


    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {

        actionBar.addTab(actionBar.newTab()
                .setText(mSectionsPagerAdapter.getPageTitle(i))
                .setTabListener(this));
    }
}

@Override
public void onTabSelected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
    // When the given tab is selected, switch to the corresponding page in
    // the ViewPager.
    mViewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
}

@Override
public void onTabReselected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
}


public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        switch (position) {
        case 0:
            FragmentA a = new FragmentA();
            Bundle args1 = new Bundle();
            args1.putInt(FragmentA.ARG_SECTION_NAME , position + 1);
            a.setArguments(args1);
            return a;

        case 1:
            FragmentB b= new FragmentB();
            Bundle args2 = new Bundle();
            args2.putInt(FragmentB.ARG_SECTION_NAME , position + 2);
            b.setArguments(args2);
            return b;

        case 2:
            FragmentC c= new FragmentC();
            Bundle args3 = new Bundle();
            args3.putInt(FragmentC.ARG_SECTION_NAME , position + 3);
            c.setArguments(args3);
            return c;

          default:
              return null;
        }
    }

这是片段对话框

* FragmentDialogView *

public class FragmentDialogView extends DialogFragment implements OnClickListener {

private static final int REAUTH_ACTIVITY_CODE = 0;
private String videoId;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

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

    Bundle mArgs = getArguments();

    View view = (View) inflater.inflate(R.layout.fragment_dialog_view, container, false);

    //Buttons
    Button button = (Button) view.findViewById(R.id.button_one);
    button.setOnClickListener(this);
    buttonDownload.setOnClickListener(this);

    return view;
}

@Override
public void onSaveInstanceState(Bundle bundle) {
    super.onSaveInstanceState(bundle);
}

@Override
public void onResume() {
    super.onResume();
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REAUTH_ACTIVITY_CODE) {

    }
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.button_one:

            //Here it should show the fragment B inside the viewpager

        break;
    default:                
        break;
   }

}
}

Answer 1

要关闭 Dialog，请在您的 DialogFragment 类中包含以下内容

private Dialog dialog;

@Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        dialog = new Dialog(getActivity());
        return dialog;
    }

    @Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.button_one:

            dismiss();

        break;
    default:                
        break;
   }

}

并创建一个界面

创建以下Communicator.java

public interface Communicator {
    public void respond(int i);
}

在你的 MainAcitvity

中实现这个 Communicator

然后像这样在你的fragment中创建这个Communicator的instance

public class FragmentDialogView extends DialogFragment implements OnClickListener {

    private Communicator com;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        com = (Communicator) getActivity();
        btn.setOnClickListener(this);
        }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.btn:
            com.respond(1);
            break;
        }
    }

每当你单击那个按钮 它会将int发送到驻留在 MainActivity

如下所示

@Override
public void respond(int i) {


        // Receive a bundle here
        // and pass the corresponding information to the FragmentB
        // here i'm receving an int and pass it to the FragmentB as a String

        FragmentManager fm = getFragmentManager();
        FragmentB fragment = (FragmentB) fm.findFragmentByTag("FragmentB");
        fragment.fromMainActivity(""+i);

        // If the above the one doesn't work keep the instance as Static and then try

        viewPager.invalidate();
        pagerAdapter.notifyDataSetChanged();
        viewPager.setCurrentItem(1, true);

    // Inside the setCuttentItem() method 0 first tab
    // 1 second tab
    // 2 third tab and so on
    } 

我在这里收到一个 int 。您可以使用捆绑包来传递相应的信息。这将更改 viewPager 以显示下一个选项卡

并在 FragmentB 中保留任何简单的方法，如下所示

public void fromMainActivity(String sample) {
    Toast.makeText(getActivity(), sample, duration).show();
}

我希望这会有所帮助 :) 编码愉快

Answer 2

1.试试这个：getDialog().dismiss();

2.正如我理解的正确，在你的片段中创建一个这样的方法，

public static FirstFragment newInstance(String text){
    FirstFragment f= new FirstFragment();
    return f;
}

在您的按钮中调用它onClick()，例如FirstFragment.newInstance("Fragment, Instance 1");

3.使用 DialogFragment 中的方法创建 Interface 可以调用以将您想要的任何数据传递回创建所述 DialogFragment 的 Fragment。还将您的片段设置为目标，例如myFragmentDialog.setTargetFragment(this, 0)。然后在对话框中，使用 getTargetFragment() 获取目标片段对象并转换为您创建的接口。现在您可以使用((MyInterface)getTargetFragment()).methodToPassData(data) 传递数据。 欲了解更多信息：link