Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.1k views
in Technique[技术] by (71.8m points)

android - How can I implement FragmentManager and FragmentTransaction to replace just a single fragment?

I have an activity with 3 fragments; a header; a body; a footer (same point as in HTML). The bodyfragment contains three buttons which each should replace the middle fragment (body; itself) with another one, but I can't figure out how to work FragmentManager and FragmentTransition in here. I can't seem to find any coherency in other peoples questions on here with regards to the way others implement their fragments. It seems everyone has their own methods, or just doesn't include the full code in their threads.

MainActivity.java

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.test_frag);
}


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

}

TestFragment.java

public class TestFragment extends Fragment {

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

    return inflater.inflate(R.layout.test_frag, container, false);
}

}

BodyFragment.java

public class BodyFragment extends Fragment {

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

    return inflater.inflate(R.layout.body_frag, container, false);
}

}

Fragment in XML

<fragment
    android:id="@+id/bodyfragment"
    android:name="com.example.test.BodyFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1"
    tools:layout="@layout/body_frag" />

BodyFragment layout in XML (button x3)

    <Button
    android:id="@+id/bsettings"
    android:layout_width="130dp"
    android:layout_height="40dp"
    android:layout_alignBaseline="@+id/bgames"
    android:layout_alignBottom="@+id/bgames"
    android:layout_toRightOf="@+id/bgames"
    android:text="SETTINGS" />
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You use the FragmentManager like this:

FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.bodyfragment, AnotherFragment.newInstance()); // newInstance() is a static factory method.
transaction.commit();

This code would replace the Fragment which sits in the View with the id R.id.bodyfragment with a new Instance of another Fragment.

EDIT:

To create a new instance of another Fragment a static factory method is supposed to be used. You would implement them in your Fragment like this:

public class AnotherFragment extends Fragment {

    public static AnotherFragment newInstance() {
        AnotherFragment fragment = new AnotherFragment();
        ...
        // do some initial setup if needed, for example Listener etc
        ...
        return fragment;
    }
    ...
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...