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POWhy this thread doesn't work?
 

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  1. POWhy this thread doesn't work?
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    <p>i have an android app, with a actitity, that shows a map, with a position. This possition is updated on sharedPreferences with a service... ok, that works fine.</p> <p>I need that my activity implements runnable to be a thread that read's the position of sharedPreferences each 1000ms and then update the item position on the map... but it doesn't works.</p> <p>As i saw in debug mode, my thread doesn't work fine, ONLY ENTER ONE TIME on RUN() method... i mean that never enters into RUN() method again, only one time, cause this, the positions doesn't be updated on the map</p> <p>What is wrong? why this thread doesn't work fine?</p> <p>public class Locate extends MapActivity{ </p> <pre><code>private TextView userText = null; private TextView permissionText = null; private TextView lastUpdateText = null; private Button locateButton = null; private Button traceButton = null; private MapView mapView = null; List&lt;Overlay&gt; mapOverlays = null; double lat; double lng; GeoPoint p; MapController mc; Drawable drawable; Drawable drawable2; MyItemizedOverlay itemizedoverlay; MyItemizedOverlay itemizedoverlay2; //para almacenar la config local de mi app, mostrarme o no en el mapa... static SharedPreferences settings; static SharedPreferences.Editor configEditor; private MyLooper mLooper; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.locate); userText = (TextView) findViewById(R.id.User); permissionText= (TextView) findViewById(R.id.Permission); lastUpdateText= (TextView) findViewById(R.id.LastUpdate); locateButton = (Button) findViewById(R.id.locate); traceButton = (Button) findViewById(R.id.trace); mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); mapOverlays = mapView.getOverlays(); mc = mapView.getController(); settings=PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext()); configEditor = settings.edit(); drawable = this.getResources().getDrawable(R.drawable.minifriend); // Icono de la cara, para posiciones de mis amigos drawable2 = this.getResources().getDrawable(R.drawable.miniicon2); // Icono del programa, para mi posicion GPS itemizedoverlay = new MyItemizedOverlay(drawable, this); // Aqui almaceno otras posiciones gps itemizedoverlay2 = new MyItemizedOverlay(drawable2, this); // Aqui almaceno mi posicion gps if (this.getIntent().getExtras() != null) /// si he recibido datos del friend en el Bundle { updateFriendPosition(); } if (settings.getBoolean("showMeCheckBox", true)) { updateMyPosition(); } locateButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Perform action on clicks //itemizedoverlay2.getItem(0). itemizedoverlay.clear(); updateFriendPosition(); itemizedoverlay2.clear(); updateMyPosition(); } }); traceButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Perform action on clicks } }); /////////////////////////////////////////////////////////////////////////////////////////// /// CODIGO PARA QUITAR EL FOCO DEL PRIMER TEXTEDIT Y QUE NO SALGA EL TECLADO DE ANDROID /// getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); /////////////////////////////////////////////////////////////////////////////////////////// //Thread thread = new Thread(this); //thread.start(); mLooper = new MyLooper(); mLooper.start(); } private void updateFriendPosition() { Bundle bundle = this.getIntent().getExtras();//get the intent &amp; bundle passed by X userText.setText(bundle.getString("user")); permissionText.setText(bundle.getString("permission")); lastUpdateText.setText(bundle.getString("lastupdate")); String coordinates[] = {bundle.getString("lat"), bundle.getString("lon")}; lat = Double.parseDouble(coordinates[0]); lng = Double.parseDouble(coordinates[1]); p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6)); OverlayItem overlayitem1 = new OverlayItem(p, bundle.getString("user"), "Hi Friend!"); itemizedoverlay.addOverlay(overlayitem1); mapOverlays.add(itemizedoverlay);// dibujo la estrella con la posicion actual del friend mc.animateTo(p); ///nos centra el mapa en la posicion donde esta nuestro amigo mc.setZoom(10); /// ajusta el zoom a 10 } public void updateMyPosition() { String coordinates[] = {settings.getString("mylatitude", null),settings.getString("mylongitude", null)}; lat = Double.parseDouble(coordinates[0]); lng = Double.parseDouble(coordinates[1]); p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6)); OverlayItem overlayitem1 = new OverlayItem(p, "Me", "My Position"); itemizedoverlay2.addOverlay(overlayitem1); mapOverlays.add(itemizedoverlay2);//dibujo mi icono para mostrarme a mi } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } /////metodos del hilo /* private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { Boolean fallo=false; itemizedoverlay2.clear(); updateMyPosition(); try{ Thread.sleep(1000);} catch (Exception e) { fallo=true; } } }; public void run() { Looper.prepare(); handler.sendEmptyMessage(0); Looper.loop(); } */ private class MyLooper extends Thread { public void run() { while (mLooper==Thread.currentThread()) { // Your code here Boolean fallo=false; itemizedoverlay2.clear(); updateMyPosition(); try{ Thread.sleep(5000);} catch (Exception e) { fallo=true; } } } } </code></pre> <p>}</p> <p>EXCEPTION WHEN I TRY TO SOLVE MY PROBLEM THE METHOD'S OF TOMS AND MARVINLABS ANSWERS:</p> <pre><code> 11-18 17:37:43.489: ERROR/AndroidRuntime(729): Uncaught handler: thread main exiting due to uncaught exception 11-18 17:37:43.528: ERROR/AndroidRuntime(729): java.util.ConcurrentModificationException 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at java.util.AbstractList$SimpleListIterator.next(AbstractList.java:66) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:41) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at com.google.android.maps.MapView.onDraw(MapView.java:471) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.View.draw(View.java:5838) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.drawChild(ViewGroup.java:1486) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1228) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.drawChild(ViewGroup.java:1484) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1228) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.View.draw(View.java:5944) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.widget.FrameLayout.draw(FrameLayout.java:352) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.drawChild(ViewGroup.java:1486) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1228) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.View.draw(View.java:5841) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.widget.FrameLayout.draw(FrameLayout.java:352) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.drawChild(ViewGroup.java:1486) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1228) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.drawChild(ViewGroup.java:1484) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1228) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.View.draw(View.java:5841) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.widget.FrameLayout.draw(FrameLayout.java:352) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1847) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewRoot.draw(ViewRoot.java:1217) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewRoot.performTraversals(ViewRoot.java:1030) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.view.ViewRoot.handleMessage(ViewRoot.java:1482) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.os.Handler.dispatchMessage(Handler.java:99) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.os.Looper.loop(Looper.java:123) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at android.app.ActivityThread.main(ActivityThread.java:3948) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at java.lang.reflect.Method.invokeNative(Native Method) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at java.lang.reflect.Method.invoke(Method.java:521) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 11-18 17:37:43.528: ERROR/AndroidRuntime(729): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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