Add simple sharing facilities for Android

- react code should be cross platform but support needs to be added
    for ios
  - only shares plain text notes for now

ReactNativeClient/android/app/build.gradle

@@ -137,7 +137,7 @@ android {
 }
 
 dependencies {
-    compile project(':react-native-file-viewer')
+	compile project(':react-native-file-viewer')
 	compile project(':react-native-securerandom')
 	compile project(':react-native-push-notification')
 	compile project(':react-native-fs')
@@ -151,6 +151,8 @@ dependencies {
 	compile project(':react-native-fetch-blob')
 	compile project(':react-native-document-picker')
 	compile project(':react-native-image-resizer')
+	compile project(':react-native-share-extension')
+	compile "com.facebook.react:react-native:+"
 }
 
 // Run this once to be able to run the application with BUCK

ReactNativeClient/android/app/src/main/AndroidManifest.xml

@@ -63,5 +63,19 @@
 			</intent-filter>
 		</activity>
 		<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
+		<activity
+			android:noHistory="true"
+			android:name=".share.ShareActivity"
+			android:configChanges="orientation"
+			android:label="@string/app_name"
+			android:screenOrientation="portrait"
+			android:theme="@style/AppTheme" >
+			<intent-filter>
+				<action android:name="android.intent.action.SEND" />
+				<category android:name="android.intent.category.DEFAULT" />
+				<data android:mimeType="text/plain" />
+			</intent-filter>
+		</activity>
 	</application>
+
 </manifest>

ReactNativeClient/android/app/src/main/java/net/cozic/joplin/MainApplication.java

@@ -7,6 +7,7 @@ import com.vinzscam.reactnativefileviewer.RNFileViewerPackage;
 import net.rhogan.rnsecurerandom.RNSecureRandomPackage;
 import com.dieam.reactnativepushnotification.ReactNativePushNotificationPackage;
 import com.imagepicker.ImagePickerPackage;
+import com.facebook.react.ReactInstanceManager;
 import com.facebook.react.ReactNativeHost;
 import com.facebook.react.ReactPackage;
 import com.facebook.react.shell.MainReactPackage;
@@ -18,6 +19,8 @@ import com.rnfs.RNFSPackage;
 import fr.bamlab.rnimageresizer.ImageResizerPackage;
 import org.pgsqlite.SQLitePluginPackage;
 
+import com.alinz.parkerdan.shareextension.SharePackage;
+
 import java.util.Arrays;
 import java.util.List;
 
@@ -42,7 +45,8 @@ public class MainApplication extends Application implements ReactApplication {
 				new RNFetchBlobPackage(),
 				new RNFSPackage(),
 				new SQLitePluginPackage(),
-				new VectorIconsPackage()
+				new VectorIconsPackage(),
+				new SharePackage()
 			);
 		}
 	};

ReactNativeClient/android/app/src/main/java/net/cozic/joplin/share/ShareActivity.java

@@ -0,0 +1,15 @@
+package net.cozic.joplin.share;
+
+
+// import ReactActivity
+import com.facebook.react.ReactActivity;
+
+
+public class ShareActivity extends ReactActivity {
+		@Override
+		protected String getMainComponentName() {
+			// this is the name AppRegistry will use to launch the Share View
+			return "Joplin";
+		}
+}
+

ReactNativeClient/android/app/src/main/java/net/cozic/joplin/share/ShareApplication.java

@@ -0,0 +1,38 @@
+package net.cozic.joplin.share;
+// import build config
+import net.cozic.joplin.BuildConfig;
+
+import com.alinz.parkerdan.shareextension.SharePackage;
+
+import android.app.Application;
+
+import com.facebook.react.shell.MainReactPackage;
+import com.facebook.react.ReactNativeHost;
+import com.facebook.react.ReactApplication;
+import com.facebook.react.ReactPackage;
+
+import java.util.Arrays;
+import java.util.List;
+
+
+public class ShareApplication extends Application implements ReactApplication {
+	private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
+		@Override
+		public boolean getUseDeveloperSupport() {
+			return BuildConfig.DEBUG;
+		}
+
+		@Override
+		protected List<ReactPackage> getPackages() {
+			return Arrays.<ReactPackage>asList(
+				new MainReactPackage(),
+				new SharePackage()
+			);
+		}
+	};
+
+	@Override
+	public ReactNativeHost getReactNativeHost() {
+		return mReactNativeHost;
+	}
+}