私のアプリケーションでは、SherlockNavigationDrawer を使用しました。デフォルトでは、navigationDrawer には 3 つのフラグメントを開くための 3 つのメニューがあります。次のフラグメントの 1 つを変更しました。しかし、フラグメントのメニューをもう一度クリックすると、画面に何も表示されません! 初めてでも問題ありません。しかし、2 回目は空白のページが表示されます。
この場合、NavigationDrawer のデフォルトのフラグメント メニューをクリックしてから画面上のフラグメントをクリックすると、画面が再び表示されますが、再度フラグメント メニューをクリックすると、画面に空白のページが表示されます。
また、フラグメントにアイテムのリストを表示しました。各アイテムをクリックすると、特定のアイテムの詳細を示す新しいフラグメントが置き換えられます。しかし、詳細フラグメントは空の表示です!!!
友達！問題はどこだ？
MainActivity コード:
public class ActivityMain extends SherlockFragmentActivity {
// Declare Variables
DrawerLayout mDrawerLayout;
ListView mDrawerList;
ActionBarDrawerToggle mDrawerToggle;
MenuListAdapter mMenuAdapter;
String[] title;
String[] subtitle;
int[] icon;
Fragment fragment1 = new Fragment1();
Fragment fragment2 = new Fragment2();
Fragment fragment_categorylist = new Fragment_CategoryList();
private CharSequence mDrawerTitle;
private CharSequence mTitle;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from drawer_main.xml
setContentView(R.layout.drawer_main);
// Get the Title
mTitle = mDrawerTitle = getTitle();
// Generate title
title = new String[] { getString(R.string.TitleFragment1),
getString(R.string.TitleFragment2),
getString(R.string.TitleFragment3) };
// Generate subtitle
subtitle = new String[] { getString(R.string.SubtitleFragment1),
getString(R.string.SubtitleFragment2),
getString(R.string.SubtitleFragment3) };
// Generate icon
icon = new int[] { R.drawable.action_about, R.drawable.action_settings,
R.drawable.collections_cloud };
// Locate DrawerLayout in drawer_main.xml
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
// Locate ListView in drawer_main.xml
mDrawerList = (ListView) findViewById(R.id.listview_drawer);
// Set a custom shadow that overlays the main content when the drawer
// opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
GravityCompat.START);
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
ActivitySwipeDetector swipe = new ActivitySwipeDetector(this);
DrawerLayout swipe_layout = (DrawerLayout) findViewById(R.id.drawer_layout);
swipe_layout.setOnTouchListener(swipe);
//LinearLayout swipe_layout2 = (LinearLayout) findViewById(R.id.fragment_pager_layout);
//swipe_layout2.setOnTouchListener(swipe);
// Pass string arrays to MenuListAdapter
mMenuAdapter = new MenuListAdapter(ActivityMain.this, title, subtitle,
icon);
// Set the MenuListAdapter to the ListView
mDrawerList.setAdapter(mMenuAdapter);
// Capture listview menu item click
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// Enable ActionBar app icon to behave as action to toggle nav drawer
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
// TODO Auto-generated method stub
super.onDrawerClosed(view);
}
public void onDrawerOpened(View drawerView) {
// TODO Auto-generated method stub
// Set the title on the action when drawer open
getSupportActionBar().setTitle(mDrawerTitle);
super.onDrawerOpened(drawerView);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
if (mDrawerLayout.isDrawerOpen(mDrawerList)) {
mDrawerLayout.closeDrawer(mDrawerList);
} else {
mDrawerLayout.openDrawer(mDrawerList);
}
}
return super.onOptionsItemSelected(item);
}
// ListView click listener in the navigation drawer
private class DrawerItemClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
selectItem(position);
}
}
private void selectItem(int position) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
// Locate Position
switch (position) {
case 0:
ft.replace(R.id.content_frame, fragment1);
break;
case 1:
ft.replace(R.id.content_frame, fragment2);
break;
case 2:
ft.replace(R.id.content_frame, fragment_categorylist);
break;
}
ft.commit();
mDrawerList.setItemChecked(position, true);
// Get the title followed by the position
setTitle(title[position]);
// Close drawer
mDrawerLayout.closeDrawer(mDrawerList);
}
デフォルトのフラグメント コード:
public class Fragment3 extends SherlockFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment3, container, false);
return rootView;
}
}
私のフラグメント (変更されたフラグメント) :
public class Fragment_CategoryList extends SherlockFragment {
static final int NUM_ITEMS = 1;
MyAdapter mAdapter;
ViewPager mPager;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_pager, container,
false);
mAdapter = new MyAdapter(getSherlockActivity().getSupportFragmentManager());
mPager = (ViewPager) rootView.findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
// Watch for button clicks.
Button button = (Button) rootView.findViewById(R.id.goto_first);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(0);
}
});
button = (Button) rootView.findViewById(R.id.goto_last);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mPager.setCurrentItem(NUM_ITEMS - 1);
}
});
return rootView;
}
// ////////////////////////////////////////////////////////////////////////
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return NUM_ITEMS;
}
@Override
public Fragment getItem(int position) {
return ArrayListFragment.newInstance(position);
}
}
public static class ArrayListFragment extends SherlockListFragment {
int mNum;
/**
* Create a new instance of CountingFragment, providing "num" as an
* argument.
*/
static ArrayListFragment newInstance(int num) {
ArrayListFragment f = new ArrayListFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
/**
* The Fragment's UI is just a simple text view showing its instance
* number.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container,
false);
View tv = v.findViewById(R.id.text);
((TextView) tv).setText("Fragment #" + mNum);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// setListAdapter(new ArrayAdapter<String>(getActivity(),
// android.R.layout.simple_list_item_1, Cheeses.sCheeseStrings));
DBAdapter db = new DBAdapter(getActivity());
// Create an array to specify the fields we want to display in the
// list (only TITLE)
String[] from = new String[] { "title", "_id" };
// and an array of the fields we want to bind those fields to (in
// this case just text1)
int[] to = new int[] { R.id.entry1, R.id.entry2 };
ArrayList<HashMap<String, String>> categoryList = db.getAll();
if (categoryList.size() != 0) {
ListAdapter adapter = new SimpleAdapter(getActivity(),
categoryList,
R.layout.fragment_pager_list_entry, from, to);
setListAdapter(adapter);
}
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
final FragmentTransaction ft = getSherlockActivity().getSupportFragmentManager().beginTransaction();
Fragment myFragment = new Fragment_QA();
int idplus = (int)id + 1;
Bundle args = new Bundle();
args.putLong("cid", idplus);
//myFragment.setArguments(args);
ft.replace(((ViewGroup)(getView().getParent())).getId(), myFragment);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();
}
}
}
メイン アクティビティ UI:
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ListView
android:id="@+id/listview_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#111"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp" />
私のフラグメント UI (Fragment_CategoryList):
<LinearLayout
android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">
</android.support.v4.view.ViewPager>
<LinearLayout android:orientation="horizontal"
android:gravity="center" android:measureWithLargestChild="true"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_weight="0">
<Button android:id="@+id/goto_first"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="FIRST">
</Button>
<Button android:id="@+id/goto_last"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="LAST">
</Button>
</LinearLayout>