我试图让Android中的导航抽屉可以从所有Activity访问时遇到一些问题。我有一个NavigationDrawer.java：
public class NavigationDrawer extends Activity {
static Context context;
private DrawerLayout mDrawerLayout;
private ExpandableListView mDrawerList;
private LinearLayout navDrawerView;
CustomExpandAdapter customAdapter;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mEventSelection;
private String[] mProfileSelection;
private int selectedPosition;
List<SampleTO> listParent;
HashMap<String, List<String>> listDataChild;
ArrayList<Event> newsFeedList = new ArrayList<Event>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = this;
mTitle = mDrawerTitle = getTitle();
navDrawerView = (LinearLayout) findViewById(R.id.navDrawerView);
mEventSelection = getResources().getStringArray(R.array.event_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ExpandableListView) findViewById(R.id.nav_left_drawer);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
GravityCompat.START);
listParent = new ArrayList<SampleTO>();
listDataChild = new HashMap<String, List<String>>();
listParent.add(new SampleTO(getString(R.string.eventDrawer),
R.drawable.event));
listDataChild.put(getString(R.string.eventDrawer),
Arrays.asList(mEventSelection));
customAdapter = new CustomExpandAdapter(this, listParent, listDataChild);
mDrawerList.setAdapter(customAdapter);
mDrawerList.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.drawer_open,
R.string.drawer_close) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
// Navigation drawer with sub menu goes here
public void selectItem(int groupPosition, int position) {
selectedPosition = position;
mDrawerLayout.closeDrawer(navDrawerView);
if (groupPosition == 0) {
switch (selectedPosition) {
case 0:
break;
case 1:
break;
}
// Navigation item for event
else if (groupPosition == 3) {
switch (selectedPosition) {
case 0:
Intent eventMain = new Intent(context, EventMain.class);
context.startActivity(eventMain);
break;
case 1:
Toast.makeText(NavigationDrawer.this, "Analyze Event",
Toast.LENGTH_LONG).show();
break;
}
}
setTitle(mEventSelection[selectedPosition]);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
@Override
public void onResume() {
super.onResume();
mDrawerList.setOnGroupClickListener(new OnGroupClickListener() {
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
int index = parent.getFlatListPosition(ExpandableListView
.getPackedPositionForGroup(groupPosition));
parent.setItemChecked(index, true);
String parentTitle = ((SampleTO) customAdapter
.getGroup(groupPosition)).getTitle();
if (parentTitle.equals(getString(R.string.amenityDrawer))) {
Toast.makeText(NavigationDrawer.this, "Amenity",
Toast.LENGTH_LONG).show();
setTitle(parentTitle);
mDrawerLayout.closeDrawer(navDrawerView);
}
return false;
}
});
mDrawerList.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
int index = parent.getFlatListPosition(ExpandableListView
.getPackedPositionForChild(groupPosition, childPosition));
parent.setItemChecked(index, true);
selectItem(groupPosition, childPosition);
return false;
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
boolean drawerOpen = mDrawerLayout.isDrawerOpen(navDrawerView);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
switch (item.getItemId()) {
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
然后当导航抽屉中的子项被选中时，我导航到我的第二个类EventMain.java：
public class EventMain extends NavigationDrawer {
public static MapView mMapView = null;
ArcGISTiledMapServiceLayer tileLayer;
LocationManager locationManager;
public static GraphicsLayer graphicsLayer = null;
public static Callout callout;
private int mYear, mMonth, mDay, mHour, mMinute;
private Calendar c;
static final int DATE_DIALOG_ID = 1;
static final int TIME_DIALOG_ID = 2;
private LinearLayout legendDiv, llNewsFeed, llSearch;
private ListView listview;
private Button btnNewsFeed, btnSearchAddr, btnLegends;
private EditText searchAddrET;
private ImageView ivEventGuide;
public static LinearLayout directionDiv;
public static TextView tvDirection, tvDirectionTitle, tvSearchTitle;
static EventController eventCtrl = new EventController();
static Event eventModel = new Event();
private ListAdapter mAdapter;
ArrayList<Event> newsFeedList = new ArrayList<Event>();
@Override
public void onCreate(Bundle savedInstanceState) {
ArcGISRuntime.setClientId("UkIVSWzquykoxCMG");
super.onCreate(savedInstanceState);
setContentView(R.layout.event_main);
context = this;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.event_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.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
它确实显示了EventMain.java上的导航抽屉图标。但是，当我尝试扩展它时，它不起作用。有什么想法吗？
提前致谢。
我的EventMain的xml布局：
<LinearLayout 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:orientation="vertical">
<FrameLayout
android:id="@+id/event_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.esri.android.map.MapView
android:id="@+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
initExtent="21801.3, 25801.0, 33218.7, 44830.0" >
</com.esri.android.map.MapView>
//Other linear and relative layouts
</FrameLayout>
</LinearLayout>
答案 0 :(得分：2)
在EventMain的{{1}}方法中，在调用onCreate()方法后调用setContentView()。这导致基类super.onCreate()中的DrawerLayout集被替换，从而有效地删除了抽屉。为防止出现这种情况，我们确保NavigationDrawer包含主要内容的标准容器DrawerLayout，并将FrameLayout的布局扩展到其中。
基本活动的布局EventMain：
main.xml在Activity子类中，<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="@+id/event_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
...
</android.support.v4.widget.DrawerLayout>
：
EventMain