我想做什么 :: 我想要一个接一个的一组行的标题
我使用的是什么 :: Sticky Header（我正在运行this示例）
发生了什么 :: 项目运行良好，但是当我滚动标题时，它将位于顶部，直到下一个标题出现
问题 :(禁用固定标题并启用标题滚动和网格）
ItemDetailFragment.java
public class ItemDetailFragment extends Fragment {
/**
* The fragment argument representing the item ID that this fragment
* represents.
*/
public static final String ARG_ITEM_ID = "item_id";
/**
* The dummy content this fragment is presenting.
*/
private int mItem;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public ItemDetailFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments().containsKey(ARG_ITEM_ID)) {
// Load the dummy content specified by the fragment
// arguments. In a real-world scenario, use a Loader
// to load content from a content provider.
mItem = getArguments().getInt(ARG_ITEM_ID);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_item_detail, container, false);
((TextView) rootView.findViewById(R.id.item_detail)).setText(getResources().getStringArray(R.array.countries)[mItem]);
return rootView;
}
}
ItemListActivity.java
public class ItemListActivity extends ActionBarActivity implements ItemListFragment.Callbacks {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
/**
* Callback method from {@link ItemListFragment.Callbacks} indicating that
* the item with the given ID was selected.
*/
@Override
public void onItemSelected(int id) {
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
arguments.putInt(ItemDetailFragment.ARG_ITEM_ID, id);
ItemDetailFragment fragment = new ItemDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.item_detail_container, fragment)
.commit();
} else {
// In single-pane mode, simply start the detail activity
// for the selected item ID.
Intent detailIntent = new Intent(this, ItemDetailActivity.class);
detailIntent.putExtra(ItemDetailFragment.ARG_ITEM_ID, id);
startActivity(detailIntent);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_list);
if (findViewById(R.id.item_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-large and
// res/values-sw600dp). If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
// In two-pane mode, list items should be given the
// 'activated' state when touched.
((ItemListFragment) getSupportFragmentManager().findFragmentById(R.id.item_list)).setActivateOnItemClick(true);
}
// TODO: If exposing deep links into your app, handle intents here.
}
}
ItemListFragment.java
public class ItemListFragment extends Fragment implements OnItemClickListener,
OnHeaderClickListener, OnHeaderLongClickListener {
private static final String KEY_LIST_POSITION = "key_list_position";
/**
* A dummy implementation of the {@link Callbacks} interface that does
* nothing. Used only when this fragment is not attached to an activity.
*/
private static Callbacks sDummyCallbacks = new Callbacks() {
@Override
public void onItemSelected(int id) {
}
};
/**
* The serialization (saved instance state) Bundle key representing the
* activated item position. Only used on tablets.
*/
private static final String STATE_ACTIVATED_POSITION = "activated_position";
/**
* The current activated item position. Only used on tablets.
*/
private int mActivatedPosition = ListView.INVALID_POSITION;
/**
* The fragment's current callback object, which is notified of list item
* clicks.
*/
private Callbacks mCallbacks = sDummyCallbacks;
private int mFirstVisible;
private GridView mGridView;
private Menu mMenu;
private Toast mToast;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public ItemListFragment() {
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// Activities containing this fragment must implement its callbacks.
if (!(activity instanceof Callbacks)) {
throw new IllegalStateException("Activity must implement fragment's callbacks.");
}
mCallbacks = (Callbacks)activity;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.fragment_item_list, menu);
mMenu = menu;
menu.findItem(R.id.menu_toggle_sticky).setChecked(
((StickyGridHeadersGridView)mGridView).areHeadersSticky());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_item_grid, container, false);
}
@Override
public void onDetach() {
super.onDetach();
// Reset the active callbacks interface to the dummy implementation.
mCallbacks = sDummyCallbacks;
}
@Override
public void onHeaderClick(AdapterView<?> parent, View view, long id) {
String text = "Header " + ((TextView)view.findViewById(android.R.id.text1)).getText() + " was tapped.";
if (mToast == null) {
mToast = Toast.makeText(getActivity(), text, Toast.LENGTH_SHORT);
} else {
mToast.setText(text);
}
mToast.show();
}
@Override
public boolean onHeaderLongClick(AdapterView<?> parent, View view, long id) {
String text = "Header " + ((TextView)view.findViewById(android.R.id.text1)).getText() + " was long pressed.";
if (mToast == null) {
mToast = Toast.makeText(getActivity(), text, Toast.LENGTH_SHORT);
} else {
mToast.setText(text);
}
mToast.show();
return true;
}
@Override
public void onItemClick(AdapterView<?> gridView, View view, int position, long id) {
// Notify the active callbacks interface (the activity, if the
// fragment is attached to one) that an item has been selected.
mCallbacks.onItemSelected(position);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_toggle_sticky:
item.setChecked(!item.isChecked());
((StickyGridHeadersGridView)mGridView)
.setAreHeadersSticky(!((StickyGridHeadersGridView)mGridView)
.areHeadersSticky());
return true;
case R.id.menu_use_list_adapter:
mGridView.setAdapter(new ArrayAdapter<String>(getActivity(), R.layout.item,
getResources().getStringArray(R.array.countries)));
mMenu.findItem(R.id.menu_use_list_adapter).setVisible(false);
mMenu.findItem(R.id.menu_use_sticky_adapter).setVisible(true);
mMenu.findItem(R.id.menu_toggle_sticky).setVisible(false);
return true;
case R.id.menu_use_sticky_adapter:
mGridView.setAdapter(new StickyGridHeadersSimpleArrayAdapter<String>(getActivity()
.getApplicationContext(), getResources().getStringArray(R.array.countries),
R.layout.header, R.layout.item));
mMenu.findItem(R.id.menu_use_list_adapter).setVisible(true);
mMenu.findItem(R.id.menu_toggle_sticky).setVisible(true);
mMenu.findItem(R.id.menu_use_sticky_adapter).setVisible(false);
return true;
default:
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mActivatedPosition != ListView.INVALID_POSITION) {
// Serialize and persist the activated item position.
outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
}
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mGridView = (GridView)view.findViewById(R.id.asset_grid);
mGridView.setOnItemClickListener(this);
/*
* Currently set in the XML layout, but this is how you would do it in
* your code.
*/
// mGridView.setColumnWidth((int) calculatePixelsFromDips(100));
// mGridView.setNumColumns(StickyGridHeadersGridView.AUTO_FIT);
mGridView.setAdapter(new StickyGridHeadersSimpleArrayAdapter<String>(getActivity()
.getApplicationContext(), getResources().getStringArray(R.array.countries),
R.layout.header, R.layout.item));
if (savedInstanceState != null) {
mFirstVisible = savedInstanceState.getInt(KEY_LIST_POSITION);
}
mGridView.setSelection(mFirstVisible);
// Restore the previously serialized activated item position.
if (savedInstanceState != null && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
}
((StickyGridHeadersGridView)mGridView).setOnHeaderClickListener(this);
((StickyGridHeadersGridView)mGridView).setOnHeaderLongClickListener(this);
setHasOptionsMenu(true);
}
/**
* Turns on activate-on-click mode. When this mode is on, list items will be
* given the 'activated' state when touched.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void setActivateOnItemClick(boolean activateOnItemClick) {
// When setting CHOICE_MODE_SINGLE, ListView will automatically
// give items the 'activated' state when touched.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mGridView.setChoiceMode(activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
: ListView.CHOICE_MODE_NONE);
}
}
@SuppressLint("NewApi")
private void setActivatedPosition(int position) {
if (position == ListView.INVALID_POSITION) {
mGridView.setItemChecked(mActivatedPosition, false);
} else {
mGridView.setItemChecked(position, true);
}
mActivatedPosition = position;
}
/**
* A callback interface that all activities containing this fragment must
* implement. This mechanism allows activities to be notified of item
* selections.
*/
public interface Callbacks {
/**
* Callback for when an item has been selected.
*/
public void onItemSelected(int position);
}
}
ItemDetailActivity.java
public class ItemDetailActivity extends ActionBarActivity {
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpTo(this, new Intent(this, ItemListActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_detail);
// Show the Up button in the action bar.
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// savedInstanceState is non-null when there is fragment state
// saved from previous configurations of this activity
// (e.g. when rotating the screen from portrait to landscape).
// In this case, the fragment will automatically be re-added
// to its container so we don't need to manually add it.
// For more information, see the Fragments API guide at:
//
// http://developer.android.com/guide/components/fragments.html
//
if (savedInstanceState == null) {
// Create the detail fragment and add it to the activity
// using a fragment transaction.
Bundle arguments = new Bundle();
arguments.putInt(ItemDetailFragment.ARG_ITEM_ID,
getIntent().getIntExtra(ItemDetailFragment.ARG_ITEM_ID, 0));
ItemDetailFragment fragment = new ItemDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.add(R.id.item_detail_container, fragment).commit();
}
}
}
答案 0 :(得分：2)
您可以通过在代码中添加以下内容来使标题随视图滚动：
mGridView.setAreHeadersSticky(false);
希望这有帮助。