Merge pull request #9 from underscopeio/master

Add custom filename support (Android only)

README.md

     - `"file"` (default): save to a temporary file *(that will only exist for as long as the app is running)*.
     - `"base64"`: encode as base64 and returns the raw string. Use only with small images as this may result of lags (the string is sent over the bridge). *N.B. This is not a data uri, use `data-uri` instead*.
     - `"data-uri"`: same as `base64` but also includes the [Data URI scheme](https://en.wikipedia.org/wiki/Data_URI_scheme) header.
+ - **`filename`** *(string)*: the name of the generated file if any (Android only). Defaults to `ReactNative_snapshot_image_${timestamp}`.
 
 ## Notes
 

android/src/main/java/fr/greweb/reactnativeviewshot/RNViewShotModule.java

         Integer height = options.hasKey("height") ? (int)(displayMetrics.density * options.getDouble("height")) : null;
         String result = options.hasKey("result") ? options.getString("result") : "file";
         try {
-            File tmpFile = "file".equals(result) ? createTempFile(getReactApplicationContext(), format) : null;
+            String name = options.hasKey("filename") ? options.getString("filename") : null;
+            File tmpFile = "file".equals(result) ? createTempFile(getReactApplicationContext(), format, name) : null;
             UIManagerModule uiManager = this.reactContext.getNativeModule(UIManagerModule.class);
             uiManager.addUIBlock(new ViewShot(tag, format, compressFormat, quality, width, height, tmpFile, result, promise));
         }
      * Create a temporary file in the cache directory on either internal or external storage,
      * whichever is available and has more free space.
      */
-    private File createTempFile(Context context, String ext)
+    private File createTempFile(Context context, String ext, String name)
             throws IOException {
         File externalCacheDir = context.getExternalCacheDir();
         File internalCacheDir = context.getCacheDir();
                     externalCacheDir : internalCacheDir;
         }
         String suffix = "." + ext;
-        return File.createTempFile(TEMP_FILE_PREFIX, suffix, cacheDir);
+        File tmpFile = File.createTempFile(TEMP_FILE_PREFIX, suffix, cacheDir);
+        if (name != null) {
+            File renamed = new File(cacheDir, name + suffix);
+            tmpFile.renameTo(renamed);
+            return renamed;
+        }
+
+        return tmpFile;
     }
 
 }

index.js

     format ?: "png" | "jpg" | "jpeg" | "webm";
     quality ?: number;
     base64 ?: bool;
+    filename ?: string;
   }
 ): Promise<string> {
   if (typeof view !== "number") {