Hi Guys I am new to android development. I made 5 activities with geo processing in them. when running individualy its fine. but when i used one activity as menu for all 5 GP Activities and navigating to them via intents, for the very first time the graphics layer is visible but for putting a point, but as soon as i press back button and again navigate to any of the Activities, on compilation side every thing is going fine, no exceptions but no graphics are visible on graphics layer....
I am pasting code for one GP activity.... please help me i dont kno what i am doing wrong...
public class DriveTimes extends Activity{ protected static final int CLOSE_LOADING_WINDOW = 0; protected static final int CANCEL_LOADING_WINDOW = 1; private MapView map = null; private ArrayList<GPParameter> params; private Geoprocessor gp; private GraphicsLayer gLayer; private ProgressDialog dialog = null; private Timer cancelDriveTimes = new Timer(); private ImageButton delete, go; private Point mappoint; private Handler uiHandler = new Handler(new Callback() { public boolean handleMessage(Message msg) { switch (msg.what) { case CLOSE_LOADING_WINDOW: if (dialog != null) { dialog.dismiss(); } cancelDriveTimes.cancel(); break; case CANCEL_LOADING_WINDOW: if (dialog != null) { dialog.dismiss(); } Toast toast = Toast.makeText(DriveTimes.this, "Taking too long to execute, canceled", Toast.LENGTH_SHORT); toast.show(); break; } return false; }
}); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.drive_times); map = (MapView)findViewById(R.id.map); // Add dynamic layer to MapView map.addLayer(new ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer")); gLayer = new GraphicsLayer(); map.addLayer(gLayer); delete = (ImageButton)findViewById(R.id.deletebutton); go = (ImageButton)findViewById(R.id.gobutton); Toast.makeText(this, "Single tap on the map", Toast.LENGTH_SHORT).show();
/** * Clear all graphics from the graphics layer. The method is called when * the trash can button is clicked by the user. */ delete.setOnClickListener(new OnClickListener() { public void onClick(View v) { gLayer.removeAll(); } }); delete.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { gLayer.removeAll(); } }); /** * In response to the clicking of the arrow button */ go.setOnClickListener(new OnClickListener() { public void onClick(View v) { start(mappoint); } }); go.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { start(mappoint); } });
map.setOnSingleTapListener(new OnSingleTapListener() { private static final long serialVersionUID = 1L;
public void onSingleTap(float x, float y) { mappoint = map.toMapPoint(x, y); Graphic g = new Graphic(mappoint,new SimpleMarkerSymbol(Color.RED, 10, STYLE.CIRCLE)); gLayer.addGraphic(g); } }); //Retrieve the non-configuration instance data that was previously returned. Object init = getLastNonConfigurationInstance(); if (init != null) { map.restoreState((String) init); } } class DriveTimesQuery extends AsyncTask<ArrayList<GPParameter>, Void, GPParameter[]> {
GPParameter[] outParams = null;
@Override protected void onPostExecute(GPParameter[] result) { if (outParams == null) return; for (int i = 0; i < outParams.length; i++) { if (outParams instanceof GPFeatureRecordSetLayer) {
/** * 1) Create the GP object by passing it the url. 2) Create the input * parameters and add to the GPParameter object. 3) Pass these params to the * execute method. * * @param mappoint * - point selected on the map by the user */ public void start(Point mappoint) { // First input parameter GPFeatureRecordSetLayer gpf = new GPFeatureRecordSetLayer("Input_Location"); gpf.setSpatialReference(map.getSpatialReference()); gpf.setGeometryType(Geometry.Type.Point); // Add the point selected by the user Graphic f = new Graphic(mappoint,new SimpleMarkerSymbol(Color.RED,25,STYLE.DIAMOND)); gpf.addGraphic(f);
// Second input parameter GPString gps=new GPString("Drive_Times"); gps.setValue("2 5 7"); //GPLinearUnit gpl = new GPLinearUnit("Days"); //gpl.setUnits("esriDouble"); //gpl.setDistance(365);
// Add params params = new ArrayList<GPParameter>(); params.add(gpf); params.add(gps);
try { dialog = ProgressDialog.show(DriveTimes.this, "", "Loading. Please wait...", true, true); new DriveTimesQuery().execute(params); cancelDriveTimes = new Timer(); cancelDriveTimes.schedule(new TimerTask() {
I've had the same problem. You are not doing anything wrong. It was a bug in the sdk.
I solved this by forcing the activity proces to close in onDestroy(). When you start a fresh activity this problem doesn't happen.
However this problem is solved in the newer api releases (v1.1 and V1.1.1). There are some other lifecycle issues, but these may not be problematic in your application.
