Fixing ProGuard support by removing usage of reflection and ignoring a few unused classes.

MyTracks/proguard.cfg

@@ -12,6 +12,8 @@
 -dontwarn com.google.android.googleapps.**
 -dontwarn com.android.common.**
 -dontwarn com.google.android.gsf.**
+-dontwarn org.codehaus.**
+-dontwarn com.google.appengine.**
 
 # Keep everything android references from XMLs
 -keep public class * extends android.app.Activity
@@ -20,6 +22,7 @@
 -keep public class * extends android.app,backup.BackupAgent
 -keep public class * extends android.content.BroadcastReceiver
 -keep public class * extends android.content.ContentProvider
+-keep public class * extends android.preference.Preference
 -keep public class com.android.vending.licensing.ILicensingService
 
 -keepclasseswithmembernames class * {

MyTracks/src/com/google/android/apps/mytracks/io/SendToFusionTables.java

@@ -30,13 +30,14 @@ import com.google.android.apps.mytracks.util.StringUtils;
 import com.google.android.apps.mytracks.util.UnitConversions;
 import com.google.android.maps.mytracks.R;
 import com.google.api.client.googleapis.GoogleHeaders;
-import com.google.api.client.googleapis.GoogleTransport;
+import com.google.api.client.googleapis.MethodOverrideIntercepter;
 import com.google.api.client.http.GenericUrl;
 import com.google.api.client.http.HttpRequest;
 import com.google.api.client.http.HttpResponse;
 import com.google.api.client.http.HttpResponseException;
 import com.google.api.client.http.HttpTransport;
 import com.google.api.client.http.InputStreamContent;
+import com.google.api.client.javanet.NetHttpTransport;
 import com.google.api.client.util.Strings;
 
 import android.app.Activity;
@@ -106,6 +107,12 @@ public class SendToFusionTables implements Runnable {
   private static String MARKER_TYPE_END = "large_red";
   private static String MARKER_TYPE_WAYPOINT = "large_yellow";
 
+  static {
+    // We manually assign the transport to avoid having HttpTransport try to
+    // load it via reflection (which breaks due to ProGuard).
+    HttpTransport.setLowLevelHttpTransport(new NetHttpTransport());
+  }
+
   public SendToFusionTables(Activity context, AuthManager auth,
       long trackId, ProgressIndicator progressIndicator,
       OnSendCompletedListener onCompletion) {
@@ -116,10 +123,14 @@ public class SendToFusionTables implements Runnable {
     this.onCompletion = onCompletion;
     this.stringUtils = new StringUtils(context);
     this.providerUtils = MyTracksProviderUtils.Factory.get(context);
-    transport = GoogleTransport.create();
-    GoogleHeaders headers = (GoogleHeaders) transport.defaultHeaders;
+
+    GoogleHeaders headers = new GoogleHeaders();
     headers.setApplicationName("Google-MyTracks-" + MyTracksUtils.getMyTracksVersion(context));
     headers.gdataVersion = GDATA_VERSION;
+
+    transport = new HttpTransport();
+    MethodOverrideIntercepter.setAsFirstFor(transport);
+    transport.defaultHeaders = headers;
   }
 
   @Override

MyTracks/src/com/google/android/apps/mytracks/util/ApiFeatures.java

@@ -33,12 +33,7 @@ public class ApiFeatures {
    */
   public static final int ANDROID_API_LEVEL = Integer.parseInt(
       Build.VERSION.SDK);
-  
-  private static final String PLATFORM_ADAPTER_GINGERBREAD =
-    "com.google.android.apps.mytracks.util.GingerbreadPlatformAdapter";
-  private static final String PLATFORM_ADAPTER_ECLAIR =
-    "com.google.android.apps.mytracks.util.EclairPlatformAdapter";
-  
+
   private static ApiFeatures instance;
   
   /**
@@ -67,30 +62,18 @@ public class ApiFeatures {
    * Allow subclasses for mocking, but no direct instantiation.
    */
   protected ApiFeatures() {
+    // It is safe to import unsupported classes as long as we only actually
+    // load the class when supported.
     if (getApiLevel() >= 9) {
-      apiPlatformAdapter = createPlatformAdapter(PLATFORM_ADAPTER_GINGERBREAD);
+      apiPlatformAdapter = new GingerbreadPlatformAdapter();
     } else if (getApiLevel() >= 5) {
-      apiPlatformAdapter = createPlatformAdapter(PLATFORM_ADAPTER_ECLAIR);
+      apiPlatformAdapter = new EclairPlatformAdapter();
     } else {
-      // Cupcake adapter is always supported, so it's safe to do static linkage.
       apiPlatformAdapter = new CupcakePlatformAdapter();
     }
-    
+
     Log.i(MyTracksConstants.TAG, "Using platform adapter " + apiPlatformAdapter.getClass());
   }
-  
-  private static ApiPlatformAdapter createPlatformAdapter(String className) {
-    try {
-      Class<?> clazz = Class.forName(className);
-      return (ApiPlatformAdapter) clazz.newInstance();
-    } catch (ClassNotFoundException e) {
-      throw new RuntimeException("ApiFeatures: Unable to find " + className, e);
-    } catch (InstantiationException e) {
-      throw new RuntimeException("ApiFeatures: Unable to instantiate " + className, e);
-    } catch (IllegalAccessException e) {
-      throw new RuntimeException("ApiFeatures: Unable to access " + className, e);
-    }
-  }
 
   public ApiPlatformAdapter getApiPlatformAdapter() {
     return apiPlatformAdapter;