Нанесение нескольких маркеров на google map v2 android

Question

Я хочу отображать несколько маркеров на карте google v2, а также на маркере анимации с анимацией перехода.

/** 
* This shows how to place markers on a map. 
*/ 
public class Map extends FragmentActivity implements 
          OnMarkerClickListener, 
          OnInfoWindowClickListener, 
          OnMarkerDragListener { 

    static LatLng[] GEOPOINTS; 
    Map con; 
    ArrayList<Article> mArticles; 

    DBHelper helper; 
    Drawable marker; 

    Button search, cancel; 
    EditText search_value; 
    Button clear_search; 
    int activity_flag=0; 

    double slat, vlong; 

    /** 
    * Demonstrates customizing the info window and/or its contents. 
    */ 
    class CustomInfoWindowAdapter implements InfoWindowAdapter { 
     private final RadioGroup mOptions; 

     // These a both viewgroups containing an ImageView with id "badge" and two TextViews with id 
     // "title" and "snippet". 
     private final View mWindow; 
     private final View mContents; 

     CustomInfoWindowAdapter() { 
      mWindow = getLayoutInflater().inflate(R.layout.custom_info_window, null); 
      mContents = getLayoutInflater().inflate(R.layout.custom_info_contents, null); 
      mOptions = (RadioGroup) findViewById(R.id.custom_info_window_options); 

     } 

     @Override 
     public View getInfoWindow(Marker marker) { 
      if (mOptions.getCheckedRadioButtonId() != R.id.custom_info_window) { 
       // This means that getInfoContents will be called. 
       return null; 
      } 
      render(marker, mWindow); 
      return mWindow; 
     } 

     @Override 
     public View getInfoContents(Marker marker) { 
      if (mOptions.getCheckedRadioButtonId() != R.id.custom_info_contents) { 
       // This means that the default info contents will be used. 
       return null; 
      } 
      render(marker, mContents); 
      return mContents; 
     } 

     private void render(Marker marker, View view) { 
      int badge; 
      badge = R.drawable.badge_qld; 
      ((ImageView) view.findViewById(R.id.badge)).setImageResource(badge); 

      String title = marker.getTitle(); 
      TextView titleUi = ((TextView) view.findViewById(R.id.title)); 
      if (title != null) { 
       // Spannable string allows us to edit the formatting of the text. 
       SpannableString titleText = new SpannableString(title); 
       titleText.setSpan(new ForegroundColorSpan(Color.RED), 0, titleText.length(), 0); 
       titleUi.setText(titleText); 
      } else { 
       titleUi.setText(""); 
      } 

      String snippet = marker.getSnippet(); 
      TextView snippetUi = ((TextView) view.findViewById(R.id.snippet)); 
      if (snippet != null && snippet.length() > 12) { 
       SpannableString snippetText = new SpannableString(snippet); 
       snippetText.setSpan(new ForegroundColorSpan(Color.MAGENTA), 0, 10, 0); 
       snippetText.setSpan(new ForegroundColorSpan(Color.BLUE), 12, snippet.length(), 0); 
       snippetUi.setText(snippetText); 
      } else { 
       snippetUi.setText(""); 
      } 
     } 
    } 

    private GoogleMap mMap; 
    private Marker[] marks; 
    private TextView mTopText; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.marker_demo); 
     con=this; 
     mTopText = (TextView) findViewById(R.id.top_text); 
     new loadingTask().execute(); 

    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     setUpMapIfNeeded(); 
    } 

    private void setUpMapIfNeeded() { 
     // Do a null check to confirm that we have not already instantiated the map. 
     if (mMap == null) { 
      // Try to obtain the map wrap the SupportMapFragment. 
      mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getPolarisMap(); 
      // Check if we were successful in obtaining the map. 
      if (mMap != null) { 
       setUpMap(); 
      } 
     } 
    } 

    private void setUpMap() { 
     // Hide the zoom controls as the button panel will cover it. 
     mMap.getUiSettings().setZoomControlsEnabled(false); 

     // Add lots of markers to the map. 
     addMarkersToMap(); 

     // Setting an info window adapter allows us to change the both the contents and look of the 
     // info window. 
     mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter()); 

     // Set listeners for marker events. See the bottom of this class for their behavior. 
     mMap.setOnMarkerClickListener(this); 
     mMap.setOnInfoWindowClickListener(this); 
     mMap.setOnMarkerDragListener(this); 

     // Pan to see all markers in view. 
     // Cannot zoom to bounds until the map has a size. 
     final View mapView = getSupportFragmentManager().findFragmentById(R.id.map).getView(); 
     if (mapView.getViewTreeObserver().isAlive()) { 
      mapView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
       @SuppressWarnings("deprecation") // We use the new method when supported 
       @SuppressLint("NewApi") // We check which build version we are using. 
       @Override 
       public void onGlobalLayout() { 
        LatLngBounds bounds = new LatLngBounds.Builder().include(GEOPOINTS[0]).build(); 
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) { 
         mapView.getViewTreeObserver().removeGlobalOnLayoutListener(this); 
        } else { 
         mapView.getViewTreeObserver().removeOnGlobalLayoutListener(this); 
        } 
        mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50)); 
       } 
      }); 
     } 
    } 

    private void addMarkersToMap() { 
     // Uses a colored icon. 

     for (int i=0;i<mArticles.size();i++){ 
      String latt=mArticles.get(i).latitude.trim().replace(",",""); 
      String lonn=mArticles.get(i).longitude.trim(); 

      //set latitude and longitude 
      GEOPOINTS[i] = new LatLng(Double.valueOf(latt), Double.valueOf(lonn)); 

      marks[i] = mMap.addMarker(new MarkerOptions() 
         .position(GEOPOINTS[i]) 
         .title(mArticles.get(i).enseigne) 
         .snippet(mArticles.get(i).type) 
         .icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow))); 
     } 

    } 

    private boolean checkReady() { 
     if (mMap == null) { 
      Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show(); 
      return false; 
     } 
     return true; 
    } 

    /** 
    * Called when the Clear button is clicked. 
    */ 
    public void onClearMap(View view) { 
     if (!checkReady()) { 
      return; 
     } 
     mMap.clear(); 
    } 

    /** 
    * Called when the Reset button is clicked. 
    */ 
    public void onResetMap(View view) { 
     if (!checkReady()) { 
      return; 
     } 
     // Clear the map because we don't want duplicates of the markers. 
     mMap.clear(); 
     addMarkersToMap(); 
    } 

    // 
    // Marker related listeners. 
    // 

    @Override 
    public boolean onMarkerClick(final Marker marker) { 
     // This causes the marker at Perth to bounce into position when it is clicked. 

      final Handler handler = new Handler(); 
      final long start = SystemClock.uptimeMillis(); 
      Projection proj = mMap.getProjection(); 
      Point startPoint = proj.toScreenLocation(GEOPOINTS[0]); 
      startPoint.offset(0, -100); 
      final LatLng startLatLng = proj.fromScreenLocation(startPoint); 
      final long duration = 1500; 

      final Interpolator interpolator = new BounceInterpolator(); 

      handler.post(new Runnable() { 
       @Override 
       public void run() { 
        long elapsed = SystemClock.uptimeMillis() - start; 
        float t = interpolator.getInterpolation((float) elapsed/duration); 
        double lng = t * GEOPOINTS[0].longitude + (1 - t) * startLatLng.longitude; 
        double lat = t * GEOPOINTS[0].latitude + (1 - t) * startLatLng.latitude; 
        marker.setPosition(new LatLng(lat, lng)); 

        if (t < 1.0) { 
         // Post again 16ms later. 
         handler.postDelayed(this, 16); 
        } 
       } 
      }); 

     // We return false to indicate that we have not consumed the event and that we wish 
     // for the default behavior to occur (which is for the camera to move such that the 
     // marker is centered and for the marker's info window to open, if it has one). 
     return false; 
    } 

    @Override 
    public void onInfoWindowClick(Marker marker) { 
     Toast.makeText(getBaseContext(), "Click Info Window", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onMarkerDragStart(Marker marker) { 
     mTopText.setText("onMarkerDragStart"); 
    } 

    @Override 
    public void onMarkerDragEnd(Marker marker) { 
     mTopText.setText("onMarkerDragEnd"); 
    } 

    @Override 
    public void onMarkerDrag(Marker marker) { 
     mTopText.setText("onMarkerDrag. Current Position: " + marker.getPosition()); 
    } 

    class loadingTask extends AsyncTask<Void, Void,Void> { 

      @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 
      setUpMapIfNeeded(); 
     } 

     @Override 
     protected Void doInBackground(Void... params) { 
      helper = DBHelper.getInstance(con); 
      mArticles = helper.getArticlesList(); 
      System.out.println(mArticles.toString()); 
      return null; 
     } 
    } 

} 

Но мой журнал показывает следующую ошибку.

java.lang.RuntimeException: Unable to resume activity 
     {com.example.test/com.example.test.Map}: java.lang.NullPointerException 
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2698) 
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2726) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2212) 
    at android.app.ActivityThread.access$600(ActivityThread.java:139) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:137) 
    at android.app.ActivityThread.main(ActivityThread.java:4899) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:511) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 
    at dalvik.system.NativeStart.main(Native Method) 
Caused by: java.lang.NullPointerException 
    at com.example.test.Map.addMarkersToMap(Map.java:233) 
    at com.example.test.Map.setUpMap(Map.java:197) 
    at com.example.test.Map.setUpMapIfNeeded(Map.java:187) 
    at com.example.test.Map.onResume(Map.java:177) 
    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1184) 
    at android.app.Activity.performResume(Activity.java:5082) 
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2688) 
    ... 12 more 

У меня есть две проблемы, первая из них является для отображения нескольких geopoints и второй, чтобы сделать каждый маркер, чтобы перейти на кране. Может кто-нибудь мне помочь.

Update: Новые журналы после изменения onResume()

java.lang.NullPointerException 
    at com.example.test.Map$1.onGlobalLayout(Map.java:217) 
    at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:646) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1726) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
    at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
    at android.view.Choreographer.doFrame(Choreographer.java:525) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
    at android.os.Handler.handleCallback(Handler.java:615) 
    at android.os.Handler.dispatchMessage(Handler.java:92) 
    at android.os.Looper.loop(Looper.java:137) 
    at android.app.ActivityThread.main(ActivityThread.java:4899) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:511) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 
    at dalvik.system.NativeStart.main(Native Method) 

Где линия 217

LatLngBounds bounds = new LatLngBounds.Builder().include(GEOPOINTS[0]).build(); 

Answer 1

вы получаете NullPointerException, потому что mArticles является нуль при вызове setUpMapIfNeeded(); в onResume()

Так Изменение

@Override 
    protected void onResume() { 
     super.onResume(); 
     setUpMapIfNeeded(); 
    } 

в

@Override 
    protected void onResume() { 
     super.onResume(); 
     new loadingTask().execute(); 
    } 

---

Edit:

ваш GEOPOINTS[0] является null в строке нет 217

LatLngBounds bounds = new LatLngBounds.Builder().include(GEOPOINTS[0]).build(); 

Reason

у вас есть проблемы внутри private void addMarkersToMap(), вы не инициализируетесь GEOPOINTS, поэтому инициализировать GEOPOINTперед циклом, для такого использования: GEOPOINTS=new LatLng[mArticles.size()];

Так оно должно выглядеть так:

GEOPOINTS=new LatLng[mArticles.size()]; 

for (int i=0;i<mArticles.size();i++){ 

     String latt=mArticles.get(i).latitude.trim().replace(",",""); 
     String lonn=mArticles.get(i).longitude.trim(); 

     //set latitude and longitude 
     GEOPOINTS[i] = new LatLng(Double.valueOf(latt), Double.valueOf(lonn));