Assorted error handling and messaging.

res/values-es/strings.xml

@@ -45,5 +45,6 @@
     <string name="serv_wait">Por favor espere, buscando dispositivo de control</string>
     <string name="serv_connected">Conectado con el dispositivo de control</string>
     <string name="serv_fail">Falló la conexión con el dispositivo de control</string>
+    <string name="cam_fail">La cámara es null!</string>
 
 </resources>

res/values/strings.xml

@@ -45,5 +45,6 @@
     <string name="serv_wait">Please wait, looking for control device</string>
     <string name="serv_connected">Connected with the control device</string>
     <string name="serv_fail">Could no connect with the control device</string>
+    <string name="cam_fail">Camera is null!</string>
 
 </resources>

src/ve/ucv/ciens/ccg/nxtcam/CamActivity.java

@@ -19,6 +19,7 @@ import ve.ucv.ciens.ccg.nxtcam.camera.CameraPreview;
 import ve.ucv.ciens.ccg.nxtcam.network.ImageTransferThread;
 import ve.ucv.ciens.ccg.nxtcam.network.LCPThread;
 import ve.ucv.ciens.ccg.nxtcam.utils.Logger;
+import ve.ucv.ciens.ccg.nxtcam.utils.ProjectConstants;
 import android.app.Activity;
 import android.content.Intent;
 import android.hardware.Camera;
@@ -110,6 +111,13 @@ public class CamActivity extends Activity{
 		imThread = null;
 	}
 	
+	@Override
+	public void onBackPressed(){
+		Intent result = new Intent();
+		setResult(Activity.RESULT_OK, result);
+		finish();
+	}
+
 	/******************
 	 * My own methods *
 	 ******************/	
@@ -122,7 +130,9 @@ public class CamActivity extends Activity{
 			Logger.log_d(TAG, CLASS_NAME + ".startCameraPreview() :: Camera and content view set.");
 		}else{
 			Logger.log_wtf(TAG, CLASS_NAME + ".startCameraPreview() :: CAMERA IS NULL!");
-			System.exit(1);
+			Intent result = new Intent();
+			setResult(ProjectConstants.RESULT_CAMERA_FAILURE, result);
+			finish();
 		}
 	}
 

src/ve/ucv/ciens/ccg/nxtcam/MainActivity.java

@@ -60,6 +60,7 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 	private final String TAG = "NXTCAM_MAIN";
 	private final String CLASS_NAME = MainActivity.class.getSimpleName();
 	private static final int REQUEST_ENABLE_BT = 1;
+	private static final int REQUEST_CAM_ACTIVITY = 2;
 
 	// Gui components
 	private Button startButton;
@@ -73,6 +74,7 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 	// Variables.
 	private boolean wifiOnByMe;
 	private boolean btOnByMe;
+	private boolean changingActivity;
 
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
@@ -82,6 +84,7 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 		// Set up fields.
 		wifiOnByMe = false;
 		btOnByMe = false;
+		changingActivity = false;
 
 		// Set up gui components.
 		startButton = (Button)findViewById(R.id.startButton);
@@ -115,12 +118,13 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 	public void onPause(){
 		super.onPause();
 
+		if(!changingActivity){
 			if(btManager.isBTEnabled() && btOnByMe)
 				btManager.disableBT();
-
 			if(wifiManager.isWifiEnabled() && wifiOnByMe)
 				setWifi(false);
 		}
+	}
 
 	@Override
 	public void onDestroy(){
@@ -142,11 +146,18 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 	}
 
 	protected void onActivityResult(int request, int result, Intent data){
-		if(request == REQUEST_ENABLE_BT && result == RESULT_OK){
+		if(request == REQUEST_ENABLE_BT){
+			if(result == RESULT_OK){
 				if(!wifiManager.isWifiEnabled())
 					enableWifi();
 			}else{
-			Toast.makeText(this, R.string.bt_on_fail, Toast.LENGTH_LONG).show();
+				Toast.makeText(this, R.string.bt_on_fail, Toast.LENGTH_SHORT).show();
+			}
+		}else if(request == REQUEST_CAM_ACTIVITY){
+			changingActivity = false;
+			if(result == ProjectConstants.RESULT_CAMERA_FAILURE){
+				Toast.makeText(this, R.string.cam_fail, Toast.LENGTH_SHORT).show();
+			}
 		}
 	}
 
@@ -160,8 +171,9 @@ public class MainActivity extends Activity implements WifiOnDialogListener, Conn
 		if(serverFound){
 			Logger.log_d(TAG, CLASS_NAME + ".startCamActivity() :: Launching camera activity.");
 			Intent intent = new Intent(this, CamActivity.class);
+			changingActivity = true;
 			intent.putExtra("address", ipAddress);
-			startActivity(intent);
+			startActivityForResult(intent, REQUEST_CAM_ACTIVITY);
 		}else{
 			Logger.log_d(TAG, CLASS_NAME + ".startCamActivity() :: Cannot launch camera activity.");
 			Toast.makeText(this, R.string.badIpToast, Toast.LENGTH_SHORT).show();

src/ve/ucv/ciens/ccg/nxtcam/utils/ProjectConstants.java

@@ -17,7 +17,10 @@ package ve.ucv.ciens.ccg.nxtcam.utils;
 
 import java.util.UUID;
 
+import android.app.Activity;
+
 public abstract class ProjectConstants {
+	// Network related constants.
 	public static final int SERVER_UDP_PORT = 8889;
 	public static final int SERVER_TCP_PORT_1 = 9989;
 	public static final int SERVER_TCP_PORT_2 = 9990;
@@ -25,5 +28,8 @@ public abstract class ProjectConstants {
 	public static final String OUI_LEGO = "00:16:53";
 	public static final String MULTICAST_ADDRESS = "230.0.0.1";
 
+	// Activity results.
+	public static final int RESULT_CAMERA_FAILURE = Activity.RESULT_FIRST_USER + 1;
+
 	public static final boolean DEBUG = true;
 }