getSupportActionBar（）在Android中返回null

我试图将地图视图附加到选项卡中的片段。getSupportActionBar（）在Android中返回null

这是我MapFragment：

import android.app.LocalActivityManager; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.Window; 

import com.actionbarsherlock.app.SherlockFragment; 

public class MapFragment extends SherlockFragment { 
    private static final String KEY_STATE_BUNDLE = "localActivityManagerState"; 

    private LocalActivityManager mLocalActivityManager; 

    protected LocalActivityManager getLocalActivityManager() { 
     return mLocalActivityManager; 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     Bundle state = null; 
     if (savedInstanceState != null) { 
      state = savedInstanceState.getBundle(KEY_STATE_BUNDLE); 
     } 

     mLocalActivityManager = new LocalActivityManager(getActivity(), true); 
     mLocalActivityManager.dispatchCreate(state); 
    } 

    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
      //This is where you specify you activity class 
     Intent i = new Intent(getActivity(), LocationActivity.class); 
     Window w = mLocalActivityManager.startActivity("tag", i); 
     View currentView=w.getDecorView(); 
     currentView.setVisibility(View.VISIBLE); 
     currentView.setFocusableInTouchMode(true); 
     ((ViewGroup) currentView).setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS); 
     return currentView; 
    } 

    @Override 
    public void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     outState.putBundle(KEY_STATE_BUNDLE, 
       mLocalActivityManager.saveInstanceState()); 
    } 

    @Override 
    public void onResume() { 
     super.onResume(); 
     mLocalActivityManager.dispatchResume(); 
    } 

    @Override 
    public void onPause() { 
     super.onPause(); 
     mLocalActivityManager.dispatchPause(getActivity().isFinishing()); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 
     mLocalActivityManager.dispatchStop(); 
    } 

    @Override 
    public void onDestroy() { 
     super.onDestroy(); 
     mLocalActivityManager.dispatchDestroy(getActivity().isFinishing()); 
    } 
}

这是我LocationActivity：

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Locale; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import org.json.JSONTokener; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Point; 
import android.graphics.drawable.Drawable; 
import android.location.Address; 
import android.location.Geocoder; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.View.OnTouchListener; 
import android.view.inputmethod.InputMethodManager; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ImageButton; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.actionbarsherlock.view.MenuItem; 

import com.google.android.maps.GeoPoint; 
import com.google.android.maps.ItemizedOverlay; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import com.google.android.maps.MyLocationOverlay; 
import com.google.android.maps.Overlay; 
import com.google.android.maps.OverlayItem; 



/* 
* A location activity that defers location and map functionality to the app. This activity can be used directly but an activity have to send lon/lat when they do the intent call. 
* (non-Javadoc) 
* @see android.widget.AdapterView.OnItemClickListener#onItemClick(android.widget.AdapterView, android.view.View, int, long) 
*/ 
public class LocationActivity extends com.actionbarsherlock.app.SherlockMapActivity { 


/*t 
* Variables for this activity. 
*/ 
    private MapView mapView; 
    private GeoPoint newP, mapOverlayP, myLocationP,p,markedP; 
    private boolean pointset = false, markset = false, point = false, markerpoint = false; 
    private ArrayList<String> address = new ArrayList<String>(); 
    private ArrayList<Double> lon = new ArrayList<Double>(); 
    private ArrayList<Double> lat = new ArrayList<Double>(); 
    private String markedAddr = null,setAddr = null; 

    private MapController mc; 
    private double latitude, longitude, Lon, Lat; 
    private ArrayList<LocationDb> locations = new ArrayList<LocationDb>(); 
    LocationDb locationDb = new LocationDb(); 
    private Bundle bundle = new Bundle(); 
    LocationManager locationManager; 
    Location location,lastLocation,myLocation; 

    long minTime = 3; 
    float bestAccuracy =1; 
    Location bestResult; 
    long bestTime = 0; 
    private LocationListener locationListener; 
    public ArrayList<Place> places = new ArrayList<Place>(); 
    ListView placesListView; 
    Button expandListButton; 
    public static EditText searchText; 
    @Override 
    public void onStart(){ 

     final View customNav = LayoutInflater.from(this).inflate(R.layout.actionbar_title, null); 
     final TextView customNavHeader = (TextView) customNav.findViewById(R.id.actionbarHeader); 
     customNavHeader.setText("Done"); 
     customNavHeader.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       onClick_addLocation(); 
      } 
     }); //e 

     getSupportActionBar().setDisplayShowCustomEnabled(true); 
     getSupportActionBar().setDisplayShowHomeEnabled(false); 
     getSupportActionBar().setDisplayShowTitleEnabled(false); 
     getSupportActionBar().setCustomView(customNav); 
    } 
    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.map); 

     mapView =(MapView)findViewById(R.id.mapView1); 

     expandListButton = (Button)findViewById(R.id.expandListButton); 
     new MyLocationOverlay(this, mapView); 


     placesListView = (ListView)findViewById(R.id.explorePlacesListView); 
     // Define a listener that responds to location updates 
     locationListener = new LocationListener() { 
     @Override 
     public void onLocationChanged(Location location) { 
      // Called when a new location is found by the network location 
      // provider. 
      // makeUseOfNewLocation(location); 
      getLonLat(location); 


     } 

     @Override 
     public void onStatusChanged(String provider, int status, Bundle extras) { 
     } 

     @Override 
     public void onProviderEnabled(String provider) { 
     } 

     @Override 
     public void onProviderDisabled(String provider) { 
     } 
     }; 

     getLocation(); 

     //handler = new Handler(); 

    // bundle = (Bundle) getIntent().getExtras().getBundle("bundle"); 

     bundle = null; 
     if (bundle != null) 
     { 
     getLocation(); 

     } 
     checkLocation(); 
     if(myLocationP != null) 
     { 
     addMyLocationMarker(myLocationP); 
     } 

     if(markset) 
     { 
     addLocationMarker(newP); 
     } 

     new GeoPoint((int) (latitude * 1E6), (int) (longitude * 1E6)); 

    //Menu 

     placesListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { 


       latitude = Double.valueOf(places.get(position).latitude); 
       longitude = Double.valueOf(places.get(position).longitude); 
       newP = new GeoPoint((int) (latitude * 1E6), (int) (longitude * 1E6)); 
       markedP = new GeoPoint((int) (latitude * 1E6), (int) (longitude * 1E6)); 
       markedAddr = places.get(position).name; 
       setAddr = places.get(position).name; 
       Toast.makeText(getApplicationContext(), markedAddr, Toast.LENGTH_LONG).show(); 
       addLocationMarker(newP); 
       pointset = false; 

      } 
     }); 



     expandListButton.setText("Searching.."); 
    }

只是不能将它连接到片段。我哪里错了？

此外，这是最好的方式去呢？我不能只将它附加在片段本身中，而不是调用另一个活动？如果是这样，怎么样？

来源

2012-12-04 Hick

您可以将LocationActivity的整个代码放在哪？包括导入和全局变量声明。 – Gix

已编辑。但我怀疑它会对你有多大帮助。我只想要一个基本的地图视图。其他的东西（映射位置）和所有那些只是函数调用。我认为我不需要为此调用单独的活动。那么，有没有可能做到这一点？ – Hick

你的问题说支持操作栏返回null，你抛出的'null'在哪里？ – Gix

我相信SherlockMapActivity延伸MapActivity不具有ActionBar

无论你正在做的，我强烈建议你看看地图version 2 Android和使用，来代替。

我也认为SherlockMapActivity已从ABS中删除。（source）

来源

2012-12-05 05:53:36 dnkoutso

getSupportActionBar（）在Android中返回null

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