AndroidStudioのテンプレートを改造したい｡(NavigationDrawerActivity)
AndroidStudioのテンプレートにあるNavigationDrawerActivityのNavigationDrawerにこちらのサイトを参考にして改良して見たのですが､以下のエラーがでてしまいました｡
エラー:
02-01 18:14:39.571 23825-23825/com.hoge.zousan.poyo E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.hoge.zousan.piyo, PID: 23825
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hoge.zousan.piyo/com.hoge.zousan.piyo.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.hoge.zousan.piyo.NavigationDrawerFragment.setUp(int, android.support.v4.widget.DrawerLayout)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.hoge.zousan.piyo.NavigationDrawerFragment.setUp(int, android.support.v4.widget.DrawerLayout)' on a null object reference
at com.hoge.zousan.piyo.MainActivity.onCreate(MainActivity.java:42)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
以下にMainActivityとNavigationDrawerFragmentと各Layout.xmlを示します｡
MainActivity.java:
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks, PopularVideoFragment.OnFragmentInteractionListener, VideoSearchFragment.OnFragmentInteractionListener,
SkillPracticeFragment.OnFragmentInteractionListener{
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {@link #restoreActionBar()}.
*/
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
//初期画面を表示
/*
android.app.FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.FragmentContainer, VideoSearchFragment.newInstance());
fragmentTransaction.commit();
*/
FragmentManager fm = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fm.beginTransaction();
fragmentTransaction.replace(R.id.FragmentContainer, PopularVideoFragment.newInstance());
fragmentTransaction.commit();
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
switch (position){
case 0:
fragmentTransaction.replace(R.id.FragmentContainer, PopularVideoFragment.newInstance());
break;
case 1:
fragmentTransaction.replace(R.id.FragmentContainer, SkillPracticeFragment.newInstance());
break;
case 2:
//fragmentTransaction.replace(R.id.FragmentContainer, ChannelFragment.newInstance());
break;
case 3:
//fragmentTransaction.replace(R.id.FragmentContainer, PlaylistFragment.newInstance());
break;
}
fragmentTransaction.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_popular);
break;
case 2:
mTitle = getString(R.string.title_skill);
break;
case 3:
mTitle = getString(R.string.title_channel);
break;
case 4:
mTitle = getString(R.string.title_playlist);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
@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.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onFragmentInteraction(Uri uri) {
}
@Override
public void onFragmentInteraction(String id){
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
NavigationDrawerFragment.java
public class NavigationDrawerFragment extends Fragment {
/**
* Remember the position of the selected item.
*/
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
/**
* Per the design guidelines, you should show the drawer on launch until the user manually
* expands it. This shared preference tracks this.
*/
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
/**
* A pointer to the current callbacks instance (the Activity).
*/
private NavigationDrawerCallbacks mCallbacks;
/**
* Helper component that ties the action bar to the navigation drawer.
*/
private android.support.v7.app.ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
//追加したやつ
private AnimatedExpandableListView mExListView;
private ExAdapter adapter;
private View mFragmentContainerView;
private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;
private DrawerArrowDrawable drawerArrowDrawable;
public NavigationDrawerFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Read in the flag indicating whether or not the user has demonstrated awareness of the
// drawer. See PREF_USER_LEARNED_DRAWER for details.
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
drawerArrowDrawable = new DrawerArrowDrawable(getResources());
drawerArrowDrawable.setStrokeColor(Color.WHITE);
if (savedInstanceState != null) {
mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
mFromSavedInstanceState = true;
drawerArrowDrawable.restoreState(savedInstanceState);
}
// Select either the default item (0) or the last selected item.
selectItem(mCurrentSelectedPosition);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Indicate that this fragment would like to influence the set of actions in the action bar.
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDrawerListView = (ListView) inflater.inflate(
R.layout.fragment_navigation_drawer, container, false);
/*
mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
mDrawerListView.setAdapter(new ArrayAdapter<String>(
getActionBar().getThemedContext(),
android.R.layout.simple_list_item_activated_1,
android.R.id.text1,
new String[]{
getString(R.string.title_popular),
getString(R.string.title_skill),
getString(R.string.title_channel),
getString(R.string.title_playlist)
}));
mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
return mDrawerListView;
*/
/*ここからオリジナル*/
List<GroupItem> items = new ArrayList<GroupItem>();
String[] groupNameList = {getString(R.string.title_popular), getString(R.string.title_skill),
getString(R.string.title_channel), getString(R.string.title_playlist)};
String[] childNameList = {getString(R.string.title_today), getString(R.string.title_last_week),
getString(R.string.title_last_month), getString(R.string.title_latest), getString(R.string.title_skill_all)};
String[] childHintList = {getString(R.string.hint_today), getString(R.string.hint_last_week),
getString(R.string.hint_last_month), getString(R.string.hint_latest), getString(R.string.hint_all)};
for(int i=0; i<4; i++){
GroupItem item = new GroupItem();
item.title = groupNameList[i];
switch (i){
case 0:
for(int j=0; j<3; j++) {
ChildItem child = new ChildItem();
child.title = childNameList[j];
child.hint = childHintList[j];
item.items.add(child);
}
break;
case 1:
for(int j=3; j<5; j++){
ChildItem child = new ChildItem();
child.title = childNameList[j];
child.hint = childHintList[j];
item.items.add(child);
}
break;
}
items.add(item);
}
adapter = new ExAdapter(getActivity());
adapter.setData(items);
mExListView = (AnimatedExpandableListView)mDrawerListView.findViewById(R.id.ex_list_view);
mExListView.setAdapter(adapter);
mExListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if (mExListView.isGroupExpanded(groupPosition)) {
mExListView.collapseGroupWithAnimation(groupPosition);
} else {
mExListView.expandGroupWithAnimation(groupPosition);
}
return true;
}
});
mExListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
switch (groupPosition){
case 0:
switch (childPosition){
case 0:
FragmentManager fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.FragmentContainer, VideoSearchFragment.newInstance(0, 0));
}
}
return true;
}
});
/*ここまでオリジナル*/
return mDrawerListView;
}
public boolean isDrawerOpen() {
return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* @param fragmentId The android:id of this fragment in its activity's layout.
* @param drawerLayout The DrawerLayout containing this fragment's UI.
*/
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the navigation drawer and the action bar app icon.
mDrawerToggle = new MaterialActionDrawerToggle(drawerArrowDrawable,
getActivity(), /* host Activity */
mDrawerLayout, /* DrawerLayout object */ /* nav drawer image to replace 'Up' caret */
R.string.navigation_drawer_open, /* "open drawer" description for accessibility */
R.string.navigation_drawer_close /* "close drawer" description for accessibility */
) {
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void selectItem(int position) {
mCurrentSelectedPosition = position;
if (mDrawerListView != null) {
mDrawerListView.setItemChecked(position, true);
}
if (mDrawerLayout != null) {
mDrawerLayout.closeDrawer(mFragmentContainerView);
}
if (mCallbacks != null) {
mCallbacks.onNavigationDrawerItemSelected(position);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallbacks = (NavigationDrawerCallbacks) activity;
} catch (ClassCastException e) {
throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
}
}
@Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
drawerArrowDrawable.onSaveInstanceState(outState);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Forward the new configuration the drawer toggle component.
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// If the drawer is open, show the global app actions in the action bar. See also
// showGlobalContextActionBar, which controls the top-left area of the action bar.
if (mDrawerLayout != null && isDrawerOpen()) {
inflater.inflate(R.menu.global, menu);
showGlobalContextActionBar();
}
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (item.getItemId() == R.id.action_example) {
Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Per the navigation drawer design guidelines, updates the action bar to show the global app
* 'context', rather than just what's in the current screen.
*/
private void showGlobalContextActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setTitle(R.string.app_name);
}
private ActionBar getActionBar() {
return ((ActionBarActivity) getActivity()).getSupportActionBar();
}
/**
* Callbacks interface that all activities using this fragment must implement.
*/
public static interface NavigationDrawerCallbacks {
/**
* Called when an item in the navigation drawer is selected.
*/
void onNavigationDrawerItemSelected(int position);
}
/*追加内部クラス*/
private static class GroupItem{
String title;
List<ChildItem> items = new ArrayList<ChildItem>();
}
private static class ChildItem{
String title;
String hint;
}
private static class ChildHolder{
TextView title;
TextView hint;
}
private static class GroupHolder{
TextView title;
}
private class ExAdapter extends AnimatedExpandableListView.AnimatedExpandableListAdapter{
private LayoutInflater inflater;
private List<GroupItem> items;
public ExAdapter(Context context){
inflater = LayoutInflater.from(context);
}
public void setData(List<GroupItem> items){
this.items=items;
}
@Override
public ChildItem getChild(int groupPosition, int childPosition){
return items.get(groupPosition).items.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition){
return childPosition;
}
@Override
public View getRealChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent){
ChildHolder holder;
ChildItem item = getChild(groupPosition, childPosition);
if(convertView == null){
holder = new ChildHolder();
convertView = inflater.inflate(R.layout.drawer_item, parent, false);
holder.title = (TextView)convertView.findViewById(R.id.text_title);
holder.hint = (TextView)convertView.findViewById(R.id.text_hint);
convertView.setTag(holder);
}else{
holder = (ChildHolder)convertView.getTag();
}
holder.title.setText(item.title);
holder.hint.setText(item.hint);
return convertView;
}
@Override
public int getRealChildrenCount(int groupPosition){
return items.get(groupPosition).items.size();
}
@Override
public GroupItem getGroup(int groupPosition){
return items.get(groupPosition);
}
@Override
public int getGroupCount(){
return items.size();
}
@Override
public long getGroupId(int groupPosition){
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent){
GroupHolder holder;
GroupItem item = getGroup(groupPosition);
if(convertView == null){
holder = new GroupHolder();
convertView = inflater.inflate(R.layout.drawer_item_group, parent, false);
holder.title = (TextView)convertView.findViewById(R.id.text_title);
convertView.setTag(holder);
}else{
holder = (GroupHolder)convertView.getTag();
}
holder.title.setText(item.title);
return convertView;
}
@Override
public boolean hasStableIds(){
return true;
}
@Override
public boolean isChildSelectable(int arg0, int arg1){
return true;
}
}
}
fragment_navigation_drawer.xml
<AnimateListView.AnimatedExpandableListView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:choiceMode="singleChoice"
android:divider="@android:color/transparent" android:dividerHeight="0dp"
android:background="#cccc" tools:context=".NavigationDrawerFragment"
android:id="@+id/ex_list_view"/>
activity_main.xml:
<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
android:layout_width="match_parent" android:layout_height="match_parent"
tools:context=".MainActivity">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<FrameLayout
android:id="@+id/FragmentContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"></FrameLayout>
<!-- android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
If you're not building against API 17 or higher, use
android:layout_gravity="left" instead. -->
<!-- The drawer is given a fixed width in dp and extends the full height of
the container. -->
<FrameLayout android:id="@+id/navigation_drawer"
android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent"
android:layout_gravity="start"
android:name="com.hoge.zousan.piyo.NavigationDrawerFragment"
tools:layout="@layout/fragment_navigation_drawer">
</FrameLayout>
おそらく､AndroidStudioのテンプレートのどこかに原因があるのたと考えたのですが､それがどこなのか私の力不足ゆえ発見できませんでした｡
NavigationDrawerを表示させて､アイテムを選択するところまでに必要なことを教えて下さい｡ よろしくお願いします｡