android zoom

spoonconsulting · Mar 12, 2024 · 4e55608 · 4e55608
1 parent 30bbf55
commit 4e55608
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diff --git a/src/android/CameraPreviewFragment.java b/src/android/CameraPreviewFragment.java
@@ -55,6 +55,10 @@ interface HasFlashCallback {
     void onResult(boolean result);
 }
 
+interface ZoomCallback {
+    void onZoom(Exception err);
+}
+
 public class CameraPreviewFragment extends Fragment {
 
     private PreviewView viewFinder;
@@ -69,6 +73,8 @@ public class CameraPreviewFragment extends Fragment {
 
     private static float ratio = (4 / (float) 3);
     private static final String TAG = "SimpleCameraPreview";
+    private float minZoomRatio;
+    private float maxZoomRatio;
 
     public CameraPreviewFragment() {
 
@@ -148,6 +154,9 @@ public void startCamera() {
                     preview,
                     imageCapture
             );
+        } finally {
+            minZoomRatio = camera.getCameraInfo().getZoomState().getValue().getMinZoomRatio();
+            maxZoomRatio = camera.getCameraInfo().getZoomState().getValue().getMaxZoomRatio();
         }
 
         preview.setSurfaceProvider(viewFinder.getSurfaceProvider());
@@ -309,4 +318,20 @@ public void setLocation(Location loc) {
             this.location = loc;
         }
     }
+
+    public float getMinZoomRatio() {
+        return minZoomRatio;
+    }
+
+    public void setZoomRatio(float zoomRatio, ZoomCallback zoomCallback) {
+        if ((zoomRatio < minZoomRatio) || (zoomRatio > maxZoomRatio)) {
+            zoomCallback.onZoom(new Exception("Unsupported zoom ratio"));
+            return;
+        }
+        try {
+            camera.getCameraControl().setZoomRatio(zoomRatio);
+        } catch (Exception e) {
+            zoomCallback.onZoom(new Exception("Failed to set zoom ratio to " + zoomRatio, e));
+        }
+    }
 }
diff --git a/src/android/SimpleCameraPreview.java b/src/android/SimpleCameraPreview.java
@@ -74,6 +74,12 @@ public boolean execute(String action, JSONArray args, CallbackContext callbackCo
 
                 case "deviceHasFlash":
                     return deviceHasFlash(callbackContext);
+
+                case "getMinZoomRatio":
+                    return getMinZoomRatio(callbackContext);
+
+                case "setZoomRatio":
+                    return setZoomRatio(Double.valueOf(args.getDouble(0)).floatValue(), callbackContext);
                 default:
                     break;
             }
@@ -323,6 +329,39 @@ public void run() {
         }
     }
 
+    private boolean getMinZoomRatio(CallbackContext callbackContext) {
+        if (fragment == null) {
+            callbackContext.error("Camera is closed, cannot get minimum zoom ratio.");
+            return true;
+        }
+        try {
+            float minZoomRatio = fragment.getMinZoomRatio();
+            PluginResult pluginResult = new PluginResult(PluginResult.Status.OK, minZoomRatio);
+            callbackContext.sendPluginResult(pluginResult);
+            return true;
+        } catch (Exception e) {
+            e.printStackTrace();
+            callbackContext.error(e.getMessage());
+            return false;
+        }
+    }
+
+    private boolean setZoomRatio(float zoomRatio, CallbackContext callbackContext) {
+        if (fragment == null) {
+            callbackContext.error("Camera is closed, cannot set zoom ratio");
+            return true;
+        }
+
+        fragment.setZoom(zoomRatio, (Exception err) -> {
+            if (err == null) {
+                callbackContext.success();
+            } else {
+                callbackContext.error(err.getMessage());
+            }
+        });
+        return true;
+    }
+
     public boolean hasAllPermissions() {
         for(String p : REQUIRED_PERMISSIONS) {
             if(!PermissionHelper.hasPermission(this, p)) {
@@ -395,6 +434,7 @@ public void onRequestPermissionResult(int requestCode, String[] permissions, int
             }
         }
     }
+
 
     @Override
     public void onDestroy() {

diff --git a/www/SimpleCameraPreview.js b/www/SimpleCameraPreview.js
@@ -36,4 +36,14 @@ SimpleCameraPreview.deviceHasFlash = function (onSuccess, onError) {
   exec(onSuccess, onError, PLUGIN_NAME, "deviceHasFlash", []);
 };
 
+SimpleCameraPreview.getMinZoomRatio = function (onSuccess, onError) {
+  exec(onSuccess, onError, PLUGIN_NAME, "getMinZoomRatio", []);
+};
+
+SimpleCameraPreview.setZoomRatio = function (options, onSuccess, onError) {
+  options = options || {};
+  options.zoomRatio = options.zoomRatio || 1;
+  exec(onSuccess, onError, PLUGIN_NAME, "setZoomRatio", [options.zoomRatio]);
+};
+
 module.exports = SimpleCameraPreview;