StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POAndroid - can't access drawable nullpointer exception
primarykey
Id
8953569
data
AcceptedAnswerId
8953595
AnswerCount
1
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2012-01-21T14:05:02.430
FavoriteCount
0
LastActivityDate
2012-01-21T15:19:11.413
LastEditDate
2012-01-21T15:19:11.413
LastEditorUserId
1162316
OwnerUserId
1162316
ParentId
0
PostTypeId
1
Score
0
ViewCount
1468
LastEditorDisplayName
text
Body
I've tried to mark multiple locations on my mapview. There is, a class extends from ItemizedOverlay. There is a constructor for that which has two paramaters <code>(Drawable defaultMarker, Context c)</code> In the MapActivity where i have the mapview i tried to define a drawable which is necessary to create the itemized overlay object, but i always have <pre><code>java.lang.NullPointerException caused by this line: Drawable marker =this.getResources().getDrawable(R.drawable.pointer); </code></pre> i've checked this variable with a syso and it doesn't seems null to me <pre><code>I/System.out(430): android.graphics.drawable.BitmapDrawable@405ca538 </code></pre> I've tried to look after solutions. What i've found is that initalize the context in the constructor of the MapActivity than i've got the following error: <pre><code>Unable to instantiate activity ComponentInfo: java.lang.InstantiationException MapController mc; GeoPoint p; MapView mapView; Location loc; boolean move = true; LocationManager mlocManager; LocationListener mlocListener = new MyLocationListener(); Context c /* if constructor commented: nullpointer else instantiation exception */ MapActivity(Context cc){ this.c=cc; } Drawable marker =c.getResources().getDrawable(R.drawable.pointer); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println(this.getResources()); mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); setContentView(R.layout.map); tv = (TextView) findViewById(R.id.textView1); mapView = (MapView) findViewById(R.id.mapv); mapView.setBuiltInZoomControls(true); mc = mapView.getController(); p = new GeoPoint((int) (lat1 * 1E6), (int) (lon1 * 1E6)); Button bck = (Button) findViewById(R.id.backBtn); bck.setOnClickListener(new View.OnClickListener() { public void onClick(View vi) { mc.animateTo(p); } }); class MapOverlay extends com.google.android.maps.Overlay { public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); Point screenPts = new Point(); mapView.getProjection().toPixels(p, screenPts); Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pointer); canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 50, null); return true; } } } </code></pre>
Tags
<android><map><nullpointerexception><overlay><drawable>
Title
Android - can't access drawable nullpointer exception
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USuser1162316
UserOwnerUserId
1. USuser1162316
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POAndroid - can't access drawable nullpointer exception
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTApproveEditSuggestion
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.