[android] added +- button to MapView with placeholder icons.

android/jni/com/mapswithme/maps/Framework.cpp

@@ -475,4 +475,9 @@ namespace android
   {
     m_work.AddString(name, value);
   }
+
+  void Framework::Scale(double k)
+  {
+    m_work.Scale(k);
+  }
 }

android/jni/com/mapswithme/maps/Framework.hpp

@@ -101,6 +101,8 @@ namespace android
     string const GetCountryName(double x, double y) const;
 
     void AddString(string const & name, string const & value);
+
+    void Scale(double k);
   };
 }
 

android/jni/com/mapswithme/maps/MWMActivity.cpp

@@ -218,4 +218,10 @@ extern "C"
       env->SetObjectArrayElement(ret, i, env->NewStringUTF(v[i].c_str()));
     return ret;
   }
+
+  JNIEXPORT void JNICALL
+  Java_com_mapswithme_maps_MWMActivity_nativeScale(JNIEnv * env, jobject thiz, jdouble k)
+  {
+    g_framework->Scale(static_cast<double>(k));
+  }
 } // extern "C"

android/res/drawable/minus_button.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_pressed="true"
+          android:drawable="@drawable/ic_minus_highlighted" />
+    <item android:drawable="@drawable/ic_minus" />
+</selector>

android/res/drawable/plus_button.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_pressed="true"
+          android:drawable="@drawable/ic_plus_highlighted" />
+    <item android:drawable="@drawable/ic_plus" />
+</selector>

android/res/layout/map.xml

@@ -4,7 +4,39 @@
     <android.view.SurfaceView android:id="@+id/map_surfaceview"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"/>
+    
+    <LinearLayout
+        android:id="@+id/navigation_buttons_container"
+        android:layout_width="wrap_content"
+        android:layout_height="fill_parent"
+        android:gravity="bottom"
+        android:layout_gravity="right"
+        android:orientation="vertical">
 
+        <Button
+            android:id="@+id/map_button_plus"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="@drawable/plus_button"
+            android:onClick="onPlusClicked"
+            android:layout_marginTop="10dip"
+            android:layout_marginBottom="5dip"
+            android:layout_marginLeft="5dip"
+            android:layout_marginRight="5dip"/>
+
+        <Button
+            android:id="@+id/map_button_minus"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="@drawable/minus_button"
+            android:onClick="onMinusClicked"
+            android:layout_marginTop="5dip"
+            android:layout_marginLeft="5dip"
+            android:layout_marginRight="5dip"
+            android:layout_marginBottom="58dip"/>
+
+    </LinearLayout>
+    
     <LinearLayout
         android:id="@+id/map_butons_container"
         android:layout_width="fill_parent"

android/src/com/mapswithme/maps/MWMActivity.java

@@ -160,9 +160,19 @@ public class MWMActivity extends NvEventQueueActivity implements LocationService
 
   private native int nativeGetMS();
   private native void nativeSetMS(int u);
+  private native void nativeScale(double k);
 
   private static final String PREFERENCES_MYPOSITION = "isMyPositionEnabled";
 
+  public void onPlusClicked(View v)
+  {
+    nativeScale(3.0 / 2);
+  }
+
+  public void onMinusClicked(View v)
+  {
+    nativeScale(2.0 / 3);
+  }
 
   public void onMyPositionClicked(View v)
   {