我正在将导航抽屉菜单与Google Map fragement集成。我有一个mapactivity它显示了从我开始的方向路径＆amp; screen1中给出的目标值。我的mapactivity正在显示方向，但在切换到导航菜单中的另一个项目时，我的应用程序没有显示下一个片段。请给我关于地图My MapActivity文件的建议，如下所示
public class MapActivity extends ActionBarActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private SlidingUpPanelLayout slidingUpPanelLayout;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
private int historyPosition;
SharedPreferences sharedpreferences;
//Map Items
LocationManager locManager;
Drawable drawable;
Document document;
GMapV2GetRouteDirection v2GetRouteDirection;
MarkerOptions markerOptions;
Location location ;
private SupportMapFragment fragment;
//Map Items
List<Overlay> mapOverlays;
// Google Map
private GoogleMap mGoogleMap;
String value;
public static LatLng SOURCE = new LatLng(0,0);
public static LatLng DESTINATION= new LatLng(0,0);
double longitude;
double latitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
value = getIntent().getStringExtra("KEY");
setContentView(R.layout.activity_map);
//Textview intialization
distancetextView=(TextView)findViewById(R.id.name11);
currentSpeedTextView=(TextView)findViewById(R.id.textView2);
estimatedDistance=(TextView)findViewById(R.id.textView1);
estimatedTime=(TextView)findViewById(R.id.textView3);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
slidingUpPanelLayout=(SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
@Override
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
supportInvalidateOptionsMenu();
}
@Override
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
supportInvalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
//Geo Coder
Geocoder coder = new Geocoder(this);
try {
ArrayList<Address> adresses = (ArrayList<Address>) coder.getFromLocationName(value, 50);
for(Address add : adresses){
if (adresses.size()>0) {//Controls to ensure it is right address such as country etc.
longitude = add.getLongitude();
latitude = add.getLatitude();
}
}
} catch (IOException e) {
e.printStackTrace();
}
DESTINATION=new LatLng(latitude,longitude);
// check if GPS enabled
GPSTracker gpsTracker = new GPSTracker(this);
if (gpsTracker.canGetLocation())
{
double Curr_Latitude = gpsTracker.latitude;
double Curr_Longitude =gpsTracker.longitude;
SOURCE=new LatLng(Curr_Latitude,Curr_Longitude);
}
v2GetRouteDirection = new GMapV2GetRouteDirection();
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mGoogleMap = supportMapFragment.getMap();
// Enabling MyLocation in Google Map
mGoogleMap.setMyLocationEnabled(true);
mGoogleMap.getUiSettings().setZoomControlsEnabled(true);
mGoogleMap.getUiSettings().setCompassEnabled(true);
mGoogleMap.getUiSettings().setMyLocationButtonEnabled(true);
mGoogleMap.getUiSettings().setAllGesturesEnabled(true);
mGoogleMap.setTrafficEnabled(true);
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(12));
markerOptions = new MarkerOptions();
GetRouteTask getRoute = new GetRouteTask();
getRoute.execute();
try {
// Loading map
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.drawer_layout, new PlaceholderFragment()).commit();
}
}
}
*/
@Override
protected void onResume() {
super.onResume();
initilizeMap();
}
/**
*
* @author VIJAYAKUMAR M
* This class Get Route on the map
*
*/
private class GetRouteTask extends AsyncTask<String, Void, String> {
private ProgressDialog Dialog;
String response = "";
@Override
protected void onPreExecute() {
Dialog = new ProgressDialog(MapActivity.this);
Dialog.setMessage("Loading route...");
Dialog.show();
}
@Override
protected String doInBackground(String... urls) {
//Get All Route values
document = v2GetRouteDirection.getDocument(SOURCE, DESTINATION, GMapV2GetRouteDirection.MODE_DRIVING);
response = "Success";
return response;
}
@Override
protected void onPostExecute(String result) {
mGoogleMap.clear();
if(response.equalsIgnoreCase("Success")){
ArrayList<LatLng> directionPoint = v2GetRouteDirection.getDirection(document);
PolylineOptions rectLine = new PolylineOptions().width(5).color(
Color.BLUE);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
// Adding route on the map
mGoogleMap.addPolyline(rectLine);
markerOptions.position(DESTINATION);
markerOptions.draggable(true);
mGoogleMap.addMarker(markerOptions);
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(SOURCE,
7));
String text=v2GetRouteDirection.getTotalDistance(document);
distancetextView.setText(text);
MapActivity.estimatedDistance.setText("DISTANCE TRAVELLED "+"0 KM");
String text1=v2GetRouteDirection.getTotalDuration(document);
estimatedTime.setText("ESTIMATED TIME "+text1);
}
Dialog.dismiss();
}
}
@Override
protected void onStop() {
super.onStop();
finish();
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
System.out.println("--ON SLIDE CLICKED----");
sharedpreferences = getSharedPreferences("MyPREFERENCES", Context.MODE_PRIVATE);
historyPosition=sharedpreferences.getInt("historyposition", 0);
Editor editor = sharedpreferences.edit();
editor.putInt("historyposition", position);
editor.commit();
System.out.println("----The Position at which the pointer Picked--"+position);
System.out.println("----The Position at which the Prev pointer Picked--"+historyPosition);
if(historyPosition!=position){
displayView(position);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.map, 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.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment =new HomeFragment();
break;
case 1:
fragment = new FindPeopleFragment();
break;
case 2:
fragment = new PhotosFragment();
break;
case 3:
fragment = new CommunityFragment();
break;
case 4:
fragment = new PagesFragment();
break;
case 5:
fragment = new WhatsHotFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getSupportActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_map, container,
false);
return rootView;
}
}
}
我的map_layout文件
<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 to display Fragments -->
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.vysystems.travelgo.slidinguppanel.SlidingUpPanelLayout
android:id="@+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/map"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#eeeeee"
android:orientation="vertical"
android:clickable="true"
android:focusable="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="68dp"
android:orientation="horizontal">
<TextView
android:id="@+id/name"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="14sp"
android:gravity="center_vertical"
android:text="TOTAL DISTANCE "
android:paddingLeft="10dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/name11"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="14sp"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="24dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="24dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView2"
android:layout_marginTop="23dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
</LinearLayout>
</com.vysystems.travelgo.slidinguppanel.SlidingUpPanelLayout>
<!-- Listview to display slider menu -->
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@color/list_divider"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector"
android:background="@color/list_background"/>
</android.support.v4.widget.DrawerLayout>
答案 0 :(得分：-1)
标签应放在应用程序的顶部，位于操作栏下方 - 如Android设计指南中所述。
请花些时间查看标签here（以及其他指南）的这些指南，它们对于开发Android应用程序至关重要！