Added hardware-check to verify availability of gyroscope. If unavailable, a message will be displayed when the app is launched.

AndroidManifest.xml

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.hitlabnz.sensor_fusion_demo"
-    android:versionCode="1"
+    android:versionCode="3"
-    android:versionName="1.0" >
+    android:versionName="1.2" >
 
     <uses-sdk
         android:minSdkVersion="11"
-        android:targetSdkVersion="18" />
+        android:targetSdkVersion="19" />
 
     <application
         android:allowBackup="false"

project.properties

@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=android-18
+target=android-19

res/values-de/strings.xml

@@ -12,5 +12,8 @@
     <string name="title_section6">Akzelerometer und Kompass</string>
     <string name="title_activity_sensor_selection">Sensorfusions Demo</string>
     <string name="title_activity_about">Über</string>
+    <string name="gyroscope_missing">Fehlendes Gyroskop</string>
+    <string name="gyroscope_missing_message">Dieses Gerät hat keinen Gyroskop-Sensor der aber notwendig ist, damit diese App richtig funktioniert. Bitte verwende ein aktuelleres Gerät, das ein Gyroskop hat.</string>
+    <string name="OK">OK</string>
     
 </resources>

res/values/strings.xml

@@ -12,5 +12,8 @@
     <string name="title_section6">Accelerometer and Compass</string>
     <string name="title_activity_sensor_selection">Sensor fusion demo</string>
     <string name="title_activity_about">About</string>
+    <string name="gyroscope_missing">Gyroscope Missing</string>
+    <string name="gyroscope_missing_message">Your device has no hardware gyroscope sensor, which would be necessary for this app to work properly. Please run it on a newer device that has a gyroscope.</string>
+    <string name="OK">OK</string>
 
 </resources>

src/org/hitlabnz/sensor_fusion_demo/HardwareChecker.java

@@ -0,0 +1,27 @@
+package org.hitlabnz.sensor_fusion_demo;
+
+import android.hardware.Sensor;
+import android.hardware.SensorManager;
+
+/**
+ * Class that tests availability of hardware sensors.
+ * 
+ * @author Alex
+ *
+ */
+public class HardwareChecker implements SensorChecker {
+
+	boolean gyroscopeIsAvailable = false;
+	
+	public HardwareChecker (SensorManager sensorManager) {
+		if(sensorManager.getSensorList(Sensor.TYPE_GYROSCOPE).size() > 0) {
+			gyroscopeIsAvailable = true;
+		}
+	}
+	
+	@Override
+	public boolean IsGyroscopeAvailable() {
+		return gyroscopeIsAvailable;
+	}
+
+}

src/org/hitlabnz/sensor_fusion_demo/SensorChecker.java

@@ -0,0 +1,11 @@
+package org.hitlabnz.sensor_fusion_demo;
+
+public interface SensorChecker {
+
+	/**
+	 * Checks if the device that is currently running the application has a hardware gyroscope built into it.
+	 * 
+	 * @return True, if a gyroscope is available. False otherwise.
+	 */
+	public boolean IsGyroscopeAvailable ();
+}

src/org/hitlabnz/sensor_fusion_demo/SensorSelectionActivity.java

@@ -10,6 +10,8 @@ import org.hitlabnz.sensor_fusion_demo.orientationProvider.ImprovedOrientationSe
 import org.hitlabnz.sensor_fusion_demo.orientationProvider.OrientationProvider;
 import org.hitlabnz.sensor_fusion_demo.orientationProvider.RotationVectorProvider;
 
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.hardware.SensorManager;
 import android.opengl.GLSurfaceView;
@@ -61,6 +63,26 @@ public class SensorSelectionActivity extends FragmentActivity {
         mViewPager = (ViewPager) findViewById(R.id.pager);
         mViewPager.setAdapter(mSectionsPagerAdapter);
 
+        // Check if device has a hardware gyroscope
+        SensorChecker checker = new HardwareChecker((SensorManager) getSystemService(SENSOR_SERVICE));
+        if(!checker.IsGyroscopeAvailable()) {
+        	// If a gyroscope is unavailable, display a warning.
+        	displayHardwareMissingWarning();
+        }
+    }
+
+    private void displayHardwareMissingWarning() {
+    	AlertDialog ad = new AlertDialog.Builder(this).create();  
+    	ad.setCancelable(false); // This blocks the 'BACK' button    
+    	ad.setTitle(getResources().getString(R.string.gyroscope_missing)); 
+    	ad.setMessage(getResources().getString(R.string.gyroscope_missing_message));
+    	ad.setButton(DialogInterface.BUTTON_NEUTRAL, getResources().getString(R.string.OK), new DialogInterface.OnClickListener() {  
+    	    @Override  
+    	    public void onClick(DialogInterface dialog, int which) {  
+    	        dialog.dismiss();                      
+    	    }  
+    	});  
+    	ad.show();  
 	}
 
 	@Override