Android replace the current fragment with another fragment

问题

I just started with fragment design for HoneyComb. I created two fragments. When i click a button in the left side fragment, a new fragment is created in right side. Meanwhile when i click a button in the right fragment(ie. DetialsFragment in my code below should be replaced by another fragment. main.xml

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\"
android:layout_width=\"match_parent\"
android:layout_height=\"match_parent\"
android:orientation=\"horizontal\" >
    <fragment class=\"com.fragment.example.Titles\"
        android:id=\"@+id/titles\" android:layout_weight=\"1\"
        android:layout_width=\"0px\"
        android:layout_height=\"match_parent\" />
    <FrameLayout android:id=\"@+id/details\" android:layout_weight=\"1\"
        android:layout_width=\"0px\"
        android:layout_height=\"match_parent\" />

</LinearLayout>

FragmentExample.java

public class FragmentExample extends Activity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

Titles.java

public class Titles extends Fragment {
    public FragmentTransaction ft;
    @Override
    public View onCreateView(LayoutInflater inflater,
        ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.main1, null);
        Button button1 = (Button)v.findViewById(R.id.button1);
        button1.setText(\"santhosh\");
        button1.setOnClickListener(new OnClickListener() {



            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                 DetailsFragment details = (DetailsFragment)
                            getFragmentManager().findFragmentById(R.id.details);
                    if (details == null || details.getShownIndex() != 1) {
                        // Make new fragment to show this selection.
                        details = DetailsFragment.newInstance(1);

                        // Execute a transaction, replacing any existing
                        // fragment with this one inside the frame.
                        ft
                                = getFragmentManager().beginTransaction();
                        ft.add(R.id.details, details, \"detail\");
                        ft.setTransition(
                                FragmentTransaction.TRANSIT_FRAGMENT_FADE);
                        ft.commit();
                    }
            }

        });
        return v;
    }
}

DetailsFragment.java

public class DetailsFragment extends Fragment {
    /**
     * Create a new instance of DetailsFragment, initialized to
     * show the text at \'index\'.
     */
    Titles title = new Titles();
    String[] titles = {\"Title1\", \"Title2\", \"Title3\", \"Title4\"};
    public static DetailsFragment newInstance(int index) {
        DetailsFragment f = new DetailsFragment();

        // Supply index input as an argument.
        Bundle args = new Bundle();
        args.putInt(\"index\", index);
        f.setArguments(args);

        return f;
    }

    public int getShownIndex() {
        return getArguments().getInt(\"index\", 0);
    }

    @Override
    public View onCreateView(LayoutInflater inflater,
        ViewGroup container, Bundle savedInstanceState) {
        if (container == null) {
            // Currently in a layout without a container, so no
            // reason to create our view.
            return null;
        }
        Button button = new Button(getActivity());
        button.setText(\"Next\");
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
            }
        });
        return button;
    }
}

回答1:

Then provided your button is showing and the click event is being fired you can call the following in your click event:

final FragmentTransaction ft = getFragmentManager().beginTransaction(); 
ft.replace(R.id.details, new NewFragmentToReplace(), "NewFragmentTag"); 
ft.commit(); 

and if you want to go back to the DetailsFragment on clicking back ensure you add the above transaction to the back stack, i.e.

ft.addToBackStack(null);

Or am I missing something? Alternatively some people suggest that your activity gets the click event for the button and it has responsibility for replacing the fragments in your details pane.

回答2:

You can try below code. it’s very easy method for push new fragment from old fragment.

private int mContainerId;
private FragmentTransaction fragmentTransaction;
private FragmentManager fragmentManager;
private final static String TAG = "DashBoardActivity";

public void replaceFragment(Fragment fragment, String TAG) {

    try {
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(mContainerId, fragment, tag);
        fragmentTransaction.addToBackStack(tag);
        fragmentTransaction.commitAllowingStateLoss();

    } catch (Exception e) {
        // TODO: handle exception
    }

}

回答3:

Use android.support.v4.app for FragmentManager & FragmentTransaction in your code, it has worked for me.

DetailsFragment detailsFragment = new DetailsFragment();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.details,detailsFragment);
fragmentTransaction.commit();

回答4:

If you have a handle to an existing fragment you can just replace it with the fragment's ID.

Example in Kotlin:

fun aTestFuction() {
   val existingFragment = MyExistingFragment() //Get it from somewhere, this is a dirty example
   val newFragment = MyNewFragment()
   replaceFragment(existingFragment, newFragment, "myTag")
}

fun replaceFragment(existing: Fragment, new: Fragment, tag: String? = null) {
    supportFragmentManager.beginTransaction().replace(existing.id, new, tag).commit()
}

回答5:

it's very simple how to replace with Fragment.

DataFromDb changeActivity = new DataFromDb();
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.changeFrg, changeActivity);
    transaction.commit();

来源：https://stackoverflow.com/questions/8163104/android-replace-the-current-fragment-with-another-fragment