feat: add property pauseAfterCapture to takePictureAsync (#1641)

Author: eqyiel

android/src/main/java/com/google/android/cameraview/Camera1.java

@@ -25,6 +25,8 @@
 import android.support.v4.util.SparseArrayCompat;
 import android.view.SurfaceHolder;
 
+import com.facebook.react.bridge.ReadableMap;
+
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
@@ -377,7 +379,7 @@ boolean getScanning() {
     }
 
     @Override
-    void takePicture() {
+    void takePicture(final ReadableMap options) {
         if (!isCameraOpened()) {
             throw new IllegalStateException(
                     "Camera is not ready. Call start() before takePicture().");
@@ -390,23 +392,25 @@ void takePicture() {
             mCamera.autoFocus(new Camera.AutoFocusCallback() {
                 @Override
                 public void onAutoFocus(boolean success, Camera camera) {
-                    takePictureInternal();
+                    takePictureInternal(options);
                 }
             });
         } else {
-            takePictureInternal();
+            takePictureInternal(options);
         }
     }
 
-    void takePictureInternal() {
+    void takePictureInternal(final ReadableMap options) {
         if (!isPictureCaptureInProgress.getAndSet(true)) {
             mCamera.takePicture(null, null, null, new Camera.PictureCallback() {
                 @Override
                 public void onPictureTaken(byte[] data, Camera camera) {
                     isPictureCaptureInProgress.set(false);
                     camera.cancelAutoFocus();
-                    camera.startPreview();
-                    mIsPreviewActive = true;
+                    if (options.hasKey("pauseAfterCapture") && !options.getBoolean("pauseAfterCapture")) {
+                        camera.startPreview();
+                        mIsPreviewActive = true;
+                    }
                     if (mIsScanning) {
                         camera.setPreviewCallback(Camera1.this);
                     }

android/src/main/java/com/google/android/cameraview/Camera2.java

@@ -41,6 +41,8 @@
 import android.os.Handler;
 import android.os.Looper;
 
+import com.facebook.react.bridge.ReadableMap;
+
 import java.io.File;
 import java.io.IOException;
 import java.nio.ByteBuffer;
@@ -460,7 +462,9 @@ int getFlash() {
     }
 
     @Override
-    void takePicture() {
+    void takePicture(ReadableMap options) {
+        mCaptureCallback.setOptions(options);
+
         if (mAutoFocus) {
             lockFocus();
         } else {
@@ -770,7 +774,7 @@ void startCaptureSession() {
 
     @Override
     public void resumePreview() {
-        startCaptureSession();
+        unlockFocus();
     }
 
     @Override
@@ -1049,7 +1053,10 @@ void captureStillPicture() {
                         public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                 @NonNull CaptureRequest request,
                                 @NonNull TotalCaptureResult result) {
-                            unlockFocus();
+                            if (mCaptureCallback.getOptions().hasKey("stopPreviewAfterCapture")
+                              && !mCaptureCallback.getOptions().getBoolean("stopPreviewAfterCapture")) {
+                                unlockFocus();
+                            }
                         }
                     }, null);
         } catch (CameraAccessException e) {
@@ -1187,6 +1194,7 @@ private static abstract class PictureCaptureCallback
         static final int STATE_CAPTURING = 5;
 
         private int mState;
+        private ReadableMap mOptions = null;
 
         PictureCaptureCallback() {
         }
@@ -1195,6 +1203,10 @@ void setState(int state) {
             mState = state;
         }
 
+        void setOptions(ReadableMap options) { mOptions = options; }
+
+        ReadableMap getOptions() { return mOptions; }
+
         @Override
         public void onCaptureProgressed(@NonNull CameraCaptureSession session,
                 @NonNull CaptureRequest request, @NonNull CaptureResult partialResult) {

android/src/main/java/com/google/android/cameraview/CameraView.java

@@ -33,6 +33,8 @@
 import android.widget.FrameLayout;
 import android.graphics.SurfaceTexture;
 
+import com.facebook.react.bridge.ReadableMap;
+
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
@@ -503,8 +505,8 @@ public int getWhiteBalance() {
      * Take a picture. The result will be returned to
      * {@link Callback#onPictureTaken(CameraView, byte[])}.
      */
-    public void takePicture() {
-        mImpl.takePicture();
+    public void takePicture(ReadableMap options) {
+        mImpl.takePicture(options);
     }
 
     /**

android/src/main/java/com/google/android/cameraview/CameraViewImpl.java

@@ -20,6 +20,8 @@
 import android.view.View;
 import android.graphics.SurfaceTexture;
 
+import com.facebook.react.bridge.ReadableMap;
+
 import java.util.Set;
 import java.util.SortedSet;
 
@@ -74,7 +76,7 @@ View getView() {
 
     abstract int getFlash();
 
-    abstract void takePicture();
+    abstract void takePicture(ReadableMap options);
 
     abstract boolean record(String path, int maxDuration, int maxFileSize,
                             boolean recordAudio, CamcorderProfile profile);

android/src/main/java/org/reactnative/camera/RNCameraView.java

@@ -239,7 +239,7 @@ public void takePicture(ReadableMap options, final Promise promise, File cacheDi
       sound.play(MediaActionSound.SHUTTER_CLICK);
     }
     try {
-      super.takePicture();
+      super.takePicture(options);
     } catch (Exception e) {
       mPictureTakenPromises.remove(promise);
       mPictureTakenOptions.remove(promise);

docs/RNCamera.md

@@ -426,6 +426,8 @@ Supported options:
 - `doNotSave` (boolean true or false). Use this with `true` if you do not want the picture to be saved as a file to cache. If no value is specified `doNotSave:false` is used. If you only need the base64 for the image, you can use this with `base64:true` and avoid having to save the file.
 
 
+ - `pauseAfterCapture` (boolean true or false).  If true, pause the preview layer immediately after capturing the image.  You will need to call `cameraRef.resumePreview()` before using the camera again. If no value is specified `pauseAfterCapture:false` is used.
+
 The promise will be fulfilled with an object with some of the following properties:
 
  - `width`: returns the image's width (taking image orientation into account)

ios/RN/RNCamera.m

@@ -391,6 +391,10 @@ - (void)takePicture:(NSDictionary *)options resolve:(RCTPromiseResolveBlock)reso
     [connection setVideoOrientation:orientation];
     [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:connection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
         if (imageSampleBuffer && !error) {
+            if ([options[@"pauseAfterCapture"] boolValue]) {
+                [[self.previewLayer connection] setEnabled:NO];
+            }
+
             BOOL useFastMode = options[@"fastMode"] && [options[@"fastMode"] boolValue];
             if (useFastMode) {
                 resolve(nil);

src/RNCamera.js

@@ -41,6 +41,7 @@ type PictureOptions = {
   width?: number,
   fixOrientation?: boolean,
   forceUpOrientation?: boolean,
+  pauseAfterCapture?: boolean,
 };
 
 type TrackedFaceFeature = FaceFeature & {
@@ -276,6 +277,11 @@ export default class Camera extends React.Component<PropsType, StateType> {
     if (options.orientation) {
       options.orientation = CameraManager.Orientation[options.orientation];
     }
+
+    if (options.pauseAfterCapture === undefined) {
+      options.pauseAfterCapture = false;
+    }
+
     return await CameraManager.takePicture(options, this._cameraHandle);
   }