Question

我有一个包含2个片段的活动，一个用于列表，一个用于细节。我想要做的是，每当单击列表项时，相关参数将被发送到详细信息片段。但我无法实现它。

这是活动：

public class ActivityMain extends ActionBarActivity{

/**
 * The {@link android.support.v4.view.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 android.support.v4.app.FragmentStatePagerAdapter}.
 */
SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */

List<String> naviList = new ArrayList<String>();
ViewPager mViewPager;
private ActionBarDrawerToggle drawerToggle;
private DrawerLayout drawer;
ListView navList;
DrawerAdapter naviAdapter;
private static final int GRAVITY = Gravity.LEFT;
private static final String jsonURL = "";
List<String> categories = new ArrayList<String>();
int check = -1, listCheck = 0;
Dialog d;

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

    // 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);

    //some methods (e.g. navi-drawer etc.)


}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    drawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    drawerToggle.onConfigurationChanged(newConfig);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.medicalendar_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    switch (item.getItemId()) {
        case R.id.action_settings:
            return true;
    }
    if (drawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}



/**
 * 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:
                return ListFragment.newInstance("FirstFragment, Default");
            case 1:
                return DetailFragment.newInstance("DetailFragment, Detail");

            default:
                return ListFragment.newInstance("FirstFragment, Default");
        }
    }

    @Override
    public int getCount() {
        return 2;
    }
}

private boolean version() {
    if (Build.VERSION.SDK_INT > 11) {
        return true;
    } else {
        return false;
    }
}

我的列表片段：

public class ListFragment extends Fragment {

ListView list;
LazyAdapter adapter;
List<String> naviList = new ArrayList<String>();
RelativeLayout loading;
EventsParser parser;
List<Event> events = new ArrayList<Event>();

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    final View v = inflater.inflate(R.layout.fragment_list, container, false);

    parser = new EventsParser("");
    events = parser.getITEMS();
    list = (ListView) v.findViewById(R.id.list);
    adapter = new LazyAdapter(getActivity(), events);
    list.setAdapter(adapter);
    return v;
}

public static ListFragment newInstance(String text) {

    ListFragment f = new ListFragment();
    Bundle b = new Bundle();
    b.putString("msg", text);
    f.setArguments(b);

    return f;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            ViewPager vp = (ViewPager) getActivity().findViewById(R.id.pager);
            //clicked item's data to pass next page.
            vp.setCurrentItem(1);
        }
    });
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}

我的细节片段：

public class DetailFragment extends Fragment {

View v;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    v = inflater.inflate(R.layout.fragment_detail, container, false);



    ImageButton imageButton = (ImageButton) v.findViewById(R.id.d_map);
    imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getActivity().getApplicationContext(), "Navigating...", Toast.LENGTH_LONG).show();
        }
    });

    return v;
}

public static DetailFragment newInstance(String text) {

    DetailFragment f = new DetailFragment();
    Bundle b = new Bundle();
    b.putString("msg", text);
    f.setArguments(b);
    return f;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {

}

如果你能帮助我，我会非常感激。

最佳，

Answer 1

基本上，您不需要ViewPager从一个片段导航到另一个片段。这应该通过使用FragmentTransaction类替换片段来实现，这将允许您在事务中传递参数。 http://developer.android.com/reference/android/app/FragmentTransaction.html

如果您仍然需要ViewPager，则应为每个片段设置标记 fragment.setTag("detail_fragment"); 而且你的onListItemClick方法应如下所示：

   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //get detail fragment instance by it's tag
            DetailFragment detail = (DetailFragment) getActivity().getFragmentManager().findFragmentByTag("detail_fragment");
            detail.setParam("data"); //you should define this method in your detail fragment
            ViewPager vp = (ViewPager) getActivity().findViewById(R.id.pager);
            //clicked item's data to pass next page.
            vp.setCurrentItem(1);
        }

在viewpager片段之间传递参数

1 个答案: