added get_current_package session (appium#657)

* added get_current_package session

* fixed review

* moved getCurrentPackage to StartActivity Interface

src/main/java/io/appium/java_client/MobileCommand.java

@@ -76,6 +76,7 @@ public class MobileCommand {
     protected static final String REPLACE_VALUE;
     protected static final String GET_SETTINGS;
     protected static final String SET_SETTINGS;
+    protected static final String GET_CURRENT_PACKAGE;
 
     public static final  Map<String, AppiumCommandInfo> commandRepository;
 
@@ -122,6 +123,7 @@ public class MobileCommand {
         REPLACE_VALUE = "replaceValue";
         GET_SETTINGS = "getSettings";
         SET_SETTINGS = "setSettings";
+        GET_CURRENT_PACKAGE = "getCurrentPackage";
 
         commandRepository = new HashMap<>();
         commandRepository.put(RESET, postC("/session/:sessionId/appium/app/reset"));
@@ -176,6 +178,7 @@ public class MobileCommand {
                         postC("/session/:sessionId/appium/device/toggle_location_services"));
         commandRepository.put(UNLOCK, postC("/session/:sessionId/appium/device/unlock"));
         commandRepository. put(REPLACE_VALUE, postC("/session/:sessionId/appium/element/:id/replace_value"));
+        commandRepository.put(GET_CURRENT_PACKAGE,getC("/session/:sessionId/appium/device/current_package"));
     }
 
     /**

src/main/java/io/appium/java_client/android/AndroidDriver.java

@@ -172,4 +172,5 @@ public void openNotifications() {
     public void toggleLocationServices() {
         CommandExecutionHelper.execute(this, toggleLocationServicesCommand());
     }
+
 }

src/main/java/io/appium/java_client/android/AndroidMobileCommandHelper.java

@@ -46,6 +46,18 @@ public class AndroidMobileCommandHelper extends MobileCommand {
                 CURRENT_ACTIVITY, ImmutableMap.<String, Object>of());
     }
 
+    /**
+     * This method forms a {@link java.util.Map} of parameters for the
+     * getting of the current package.
+     *
+     * @return a key-value pair. The key is the command name. The value is a
+     * {@link java.util.Map} command arguments.
+     */
+    public static Map.Entry<String, Map<String, ?>> currentPackageCommand() {
+        return new AbstractMap.SimpleEntry<>(
+                GET_CURRENT_PACKAGE, ImmutableMap.<String, Object>of());
+    }
+
     /**
      * This method forms a {@link java.util.Map} of parameters for the
      * ending of the test coverage.

src/main/java/io/appium/java_client/android/StartsActivity.java

@@ -17,6 +17,7 @@
 package io.appium.java_client.android;
 
 import static io.appium.java_client.android.AndroidMobileCommandHelper.currentActivityCommand;
+import static io.appium.java_client.android.AndroidMobileCommandHelper.currentPackageCommand;
 import static io.appium.java_client.android.AndroidMobileCommandHelper.startActivityCommand;
 
 import io.appium.java_client.CommandExecutionHelper;
@@ -56,4 +57,13 @@ default void startActivity(Activity activity) {
     default String currentActivity() {
         return CommandExecutionHelper.execute(this, currentActivityCommand());
     }
+
+    /**
+     * Get the current package being run on the mobile device.
+     *
+     * @return a current package being run on the mobile device.
+     */
+    default String getCurrentPackage() {
+        return CommandExecutionHelper.execute(this, currentPackageCommand());
+    }
 }

src/test/java/io/appium/java_client/android/AndroidDriverTest.java

@@ -181,4 +181,8 @@ public class AndroidDriverTest extends BaseAndroidTest {
 
     }
 
+    @Test public void getCurrentPackageTest() {
+        assertEquals("io.appium.android.apis",driver.getCurrentPackage());
+    }
+
 }