Add android action view intent API for #75

src/android.js

+// Copyright 2016 wkh237@github. All rights reserved.
+// Use of this source code is governed by a MIT-style license that can be
+// found in the LICENSE file.
+// @flow
+
+import {
+  NativeModules,
+  DeviceEventEmitter,
+  Platform,
+  NativeAppEventEmitter,
+} from 'react-native'
+
+const RNFetchBlob:RNFetchBlobNative = NativeModules.RNFetchBlob
+
+/**
+ * Send an intent to open the file.
+ * @param  {string]} path Path of the file to be open.
+ * @param  {string} mime MIME type string
+ * @return {Promise}
+ */
+function actionViewIntent(path:string, mime = 'text/plain':string) {
+  if(Platform.OS === 'android')
+    return RNFetchBlob.actionViewIntent(path, mime)
+  else
+    return Promise.reject('RNFetchBlob.actionViewIntent only supports Android.')
+}
+
+
+export default {
+  actionViewIntent
+}

src/android/src/main/java/com/RNFetchBlob/RNFetchBlob.java

 package com.RNFetchBlob;
 
+import android.content.Intent;
+import android.net.Uri;
+
 import com.facebook.react.bridge.Callback;
 import com.facebook.react.bridge.Promise;
 import com.facebook.react.bridge.ReactApplicationContext;
 
     }
 
+    @ReactMethod
+    public void actionViewIntent(String path, String mime, Promise promise) {
+        try {
+            Intent intent= new Intent(Intent.ACTION_VIEW)
+                    .setDataAndType(Uri.parse("file://" + path), mime);
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            this.getReactApplicationContext().startActivity(intent);
+            promise.resolve(null);
+        } catch(Exception ex) {
+            promise.reject(ex.getLocalizedMessage());
+        }
+    }
+
     @ReactMethod
     public void createFileASCII(final String path, final ReadableArray dataArray, final Callback callback) {
         threadPool.execute(new Runnable() {

src/android/src/main/java/com/RNFetchBlob/RNFetchBlobReq.java

                         cursor.moveToFirst();
                         String filePath = cursor.getString(0);
                         cursor.close();
-                        this.callback.invoke(null, null, filePath);
+                        this.callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_PATH, filePath);
                     }
                     else
                         this.callback.invoke(null, null, null);

src/index.js

 import getUUID from './utils/uuid'
 import base64 from 'base-64'
 import polyfill from './polyfill'
+import android from './android'
 const {
   RNFetchBlobSession,
   readStream,
   cp
 } = fs
 
+
 const Blob = polyfill.Blob
 const emitter = DeviceEventEmitter
 const RNFetchBlob:RNFetchBlobNative = NativeModules.RNFetchBlob
 export default {
   fetch,
   base64,
+  android,
   config,
   session,
   fs,