Update Android functionality to provide the "captureScreenshot". This will capture the entire screen and all the views currently displayed. This performs a native screen capture so a ref tag is not required.

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

               file = createTempFile(getReactApplicationContext(), format);
             }
             UIManagerModule uiManager = this.reactContext.getNativeModule(UIManagerModule.class);
-            uiManager.addUIBlock(new ViewShot(tag, format, compressFormat, quality, width, height, file, result, snapshotContentContainer,reactContext, promise));
+            uiManager.addUIBlock(new ViewShot(tag, format, compressFormat, quality, width, height, file, result, snapshotContentContainer,reactContext, getCurrentActivity(), promise));
         }
         catch (Exception e) {
             promise.reject(ViewShot.ERROR_UNABLE_TO_SNAPSHOT, "Failed to snapshot view tag "+tag);
         }
     }
 
+    @ReactMethod
+    public void captureScreenshot(ReadableMap options, Promise promise) {
+        captureRef(-1, options, promise);
+    }
+
     private static final String TEMP_FILE_PREFIX = "ReactNative-snapshot-image";
 
     /**

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

     private Promise promise;
     private Boolean snapshotContentContainer;
     private  ReactApplicationContext reactContext;
+    private Activity currentActivity;
 
     public ViewShot(
             int tag,
             String result,
             Boolean snapshotContentContainer,
             ReactApplicationContext reactContext,
+            Activity currentActivity,
             Promise promise) {
         this.tag = tag;
         this.extension = extension;
         this.result = result;
         this.snapshotContentContainer = snapshotContentContainer;
         this.reactContext = reactContext;
+        this.currentActivity = currentActivity;
         this.promise = promise;
     }
 
     @Override
     public void execute(NativeViewHierarchyManager nativeViewHierarchyManager) {
         OutputStream os = null;
-        View view = nativeViewHierarchyManager.resolveView(tag);
+        View view = null;
+
+        if (tag == -1) {
+            view = currentActivity.getWindow().getDecorView().findViewById(android.R.id.content);
+        } else {
+            view = nativeViewHierarchyManager.resolveView(tag);
+        }
+
         if (view == null) {
             promise.reject(ERROR_UNABLE_TO_SNAPSHOT, "No view found with reactTag: "+tag);
             return;

src/index.js

   }
 }
 
+export function captureScreenshot(
+  optionsObject?: Options
+): Promise<string> {
+  const { options, errors } = validateOptions(optionsObject);
+  if (__DEV__ && errors.length > 0) {
+    console.warn(
+      "react-native-view-shot: bad options:\n" +
+        errors.map(e => `- ${e}`).join("\n")
+    );
+  }
+  return RNViewShot.captureScreenshot(options);
+}
+
 type Props = {
   options?: Object,
   captureMode?: "mount" | "continuous" | "update",