[Android] add enableCamera method app examples (PaddlePaddle#751)

* Remove redundant code for segmentation.

* Classification Documentation and example improvement.

* Ocr Documentation and example improvement.

* 1.detection、face、seg module add "svPreview.enableCamera();".
2.java/android add fastdepolyUi module.

* examples/vision/ to add OCRv3.

* Modify UI directory name.

* Refresh examples\vision,change OCR README.md

* Update ui module

* Update ui module

* [Android] add enableCamera method.

Co-authored-by: DefTruth <[email protected]>

Author: WinterGeng

examples/vision/detection/paddledetection/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/detection/DetectionMainActivity.java

@@ -305,6 +305,8 @@ protected void onResume() {
         // Open camera until the permissions have been granted
         if (!checkAllPermissions()) {
             svPreview.disableCamera();
+        } else {
+            svPreview.enableCamera();
         }
         svPreview.onResume();
     }

examples/vision/detection/paddledetection/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/ui/view/CameraSurfaceView.java

@@ -278,6 +278,10 @@ public void disableCamera() {
         disableCamera = true;
     }
 
+    public void enableCamera() {
+        disableCamera = false;
+    }
+
     public void switchCamera() {
         releaseCamera();
         selectedCameraId = (selectedCameraId + 1) % numberOfCameras;

examples/vision/facedet/scrfd/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/facedet/FaceDetMainActivity.java

@@ -300,6 +300,8 @@ protected void onResume() {
         // Open camera until the permissions have been granted
         if (!checkAllPermissions()) {
             svPreview.disableCamera();
+        } else {
+            svPreview.enableCamera();
         }
         svPreview.onResume();
     }

examples/vision/facedet/scrfd/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/ui/view/CameraSurfaceView.java

@@ -278,6 +278,10 @@ public void disableCamera() {
         disableCamera = true;
     }
 
+    public void enableCamera() {
+        disableCamera = false;
+    }
+
     public void switchCamera() {
         releaseCamera();
         selectedCameraId = (selectedCameraId + 1) % numberOfCameras;

examples/vision/segmentation/paddleseg/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/examples/segmentation/SegmentationMainActivity.java

@@ -287,6 +287,8 @@ protected void onResume() {
         // Open camera until the permissions have been granted
         if (!checkAllPermissions()) {
             svPreview.disableCamera();
+        } else {
+            svPreview.enableCamera();
         }
         svPreview.onResume();
     }

examples/vision/segmentation/paddleseg/android/app/src/main/java/com/baidu/paddle/fastdeploy/app/ui/view/CameraSurfaceView.java

@@ -278,6 +278,10 @@ public void disableCamera() {
         disableCamera = true;
     }
 
+    public void enableCamera() {
+        disableCamera = false;
+    }
+
     public void switchCamera() {
         releaseCamera();
         selectedCameraId = (selectedCameraId + 1) % numberOfCameras;