add custom file name props for android

README.md

@@ -41,7 +41,7 @@ class ExampleCaptureOnMountManually extends Component {
   }
   render() {
     return (
-      <ViewShot ref="viewShot" options={{ format: "jpg", quality: 0.9 }}>
+      <ViewShot ref="viewShot" options={{ fileName: "Your-File-Name" format: "jpg", quality: 0.9 }}>
         <Text>...Something to rasterize...</Text>
       </ViewShot>
     );
@@ -126,6 +126,7 @@ Returns a Promise of the image URI.
 
 - **`view`** is a reference to a React Native component.
 - **`options`** may include:
+  - **`fileName`** _(string)_: the file name of the file.
   - **`width`** / **`height`** _(number)_: the width and height of the final image (resized from the View bound. don't provide it if you want the original pixel size).
   - **`format`** _(string)_: either `png` or `jpg` or `webm` (Android). Defaults to `png`.
   - **`quality`** _(number)_: the quality. 0.0 - 1.0 (default). (only available on lossy formats like jpg)

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

@@ -84,12 +84,13 @@ public void captureRef(int tag, ReadableMap options, Promise promise) {
         final Integer scaleWidth = options.hasKey("width") ? (int) (dm.density * options.getDouble("width")) : null;
         final Integer scaleHeight = options.hasKey("height") ? (int) (dm.density * options.getDouble("height")) : null;
         final String resultStreamFormat = options.getString("result");
+        final String fileName = options.hasKey("fileName") ? options.getString("fileName") : null;
         final Boolean snapshotContentContainer = options.getBoolean("snapshotContentContainer");
 
         try {
             File outputFile = null;
             if (Results.TEMP_FILE.equals(resultStreamFormat)) {
-                outputFile = createTempFile(getReactApplicationContext(), extension);
+                outputFile = createTempFile(getReactApplicationContext(), extension, fileName);
             }
 
             final Activity activity = getCurrentActivity();
@@ -163,7 +164,7 @@ private void cleanDirectory(@NonNull final File directory) {
      * whichever is available and has more free space.
      */
     @NonNull
-    private File createTempFile(@NonNull final Context context, @NonNull final String ext) throws IOException {
+    private File createTempFile(@NonNull final Context context, @NonNull final String ext, String fileName) throws IOException {
         final File externalCacheDir = context.getExternalCacheDir();
         final File internalCacheDir = context.getCacheDir();
         final File cacheDir;
@@ -182,6 +183,9 @@ private File createTempFile(@NonNull final Context context, @NonNull final Strin
         }
 
         final String suffix = "." + ext;
+        if (fileName != null) {
+            return File.createTempFile(fileName, suffix, cacheDir);
+        }
         return File.createTempFile(TEMP_FILE_PREFIX, suffix, cacheDir);
     }
 }