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[camera_android] Reset AE and AF triggers to idle after capture #11330

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[camera_android] Reset AE and AF triggers to idle after capture #11330

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61b2ecd
[camera_android] Reset AE and AF triggers to idle after capture
q2a3z Mar 23, 2026
07abc0f
[camera_android] Implement trigger reset callback for AE and AF captu…
q2a3z Mar 27, 2026
daa1d07
Revert "[camera_android] Reset AE and AF triggers to idle after capture"
q2a3z Mar 27, 2026
24517fc
Merge branch 'main' into fix/Camera2-ae-af-reset
q2a3z Mar 27, 2026
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35 changes: 33 additions & 2 deletions packages/camera/camera_android/android/src/main/java/io/flutter/plugins/camera/Camera.java
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CaptureFailure;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
Expand Down Expand Up @@ -675,13 +676,39 @@ private void runPrecaptureSequence() {

// Trigger one capture to start AE sequence.
captureSession.capture(
previewRequestBuilder.build(), cameraCaptureCallback, backgroundHandler);
previewRequestBuilder.build(),
createTriggerResetCallback(
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_IDLE),
backgroundHandler);

} catch (CameraAccessException e) {
e.printStackTrace();
}
}

@VisibleForTesting
CameraCaptureSession.CaptureCallback createTriggerResetCallback(
final CaptureRequest.Key<Integer> triggerKey, final int triggerIdleValue) {
return new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
previewRequestBuilder.set(triggerKey, triggerIdleValue);
}

@Override
public void onCaptureFailed(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureFailure failure) {
previewRequestBuilder.set(triggerKey, triggerIdleValue);
}
};
}

/**
* Capture a still picture. This method should be called when a response is received {@link
* #cameraCaptureCallback} from both lockFocus().
Expand Down Expand Up @@ -788,7 +815,11 @@ private void lockAutoFocus() {
CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_START);

try {
captureSession.capture(previewRequestBuilder.build(), null, backgroundHandler);
captureSession.capture(
previewRequestBuilder.build(),
createTriggerResetCallback(
CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_IDLE),
backgroundHandler);
} catch (CameraAccessException e) {
String message =
(e.getMessage() == null)
Expand Down
56 changes: 56 additions & 0 deletions ...ges/camera/camera_android/android/src/test/java/io/flutter/plugins/camera/CameraTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -976,6 +976,62 @@ public void setFocusMode_shouldSendErrorEventOnLockAutoFocusCameraAccessExceptio
verify(mockDartMessenger, times(1)).sendCameraErrorEvent(any());
}

@Test
public void createTriggerResetCallback_shouldResetTriggerOnCaptureCompleted() {
CaptureRequest.Key<Integer> triggerKey = CaptureRequest.CONTROL_AF_TRIGGER;
int idleValue = CameraMetadata.CONTROL_AF_TRIGGER_IDLE;

CameraCaptureSession.CaptureCallback callback =
camera.createTriggerResetCallback(triggerKey, idleValue);

callback.onCaptureCompleted(
mock(CameraCaptureSession.class), mock(CaptureRequest.class), mock(TotalCaptureResult.class));

verify(mockPreviewRequestBuilder, times(1)).set(triggerKey, idleValue);
}

@Test
public void createTriggerResetCallback_shouldResetTriggerOnCaptureFailed() {
CaptureRequest.Key<Integer> triggerKey = CaptureRequest.CONTROL_AF_TRIGGER;
int idleValue = CameraMetadata.CONTROL_AF_TRIGGER_IDLE;

CameraCaptureSession.CaptureCallback callback =
camera.createTriggerResetCallback(triggerKey, idleValue);

callback.onCaptureFailed(
mock(CameraCaptureSession.class), mock(CaptureRequest.class), mock(CaptureFailure.class));

verify(mockPreviewRequestBuilder, times(1)).set(triggerKey, idleValue);
}

@Test
public void createTriggerResetCallback_shouldResetAEPrecaptureTriggerOnCaptureCompleted() {
CaptureRequest.Key<Integer> triggerKey = CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER;
int idleValue = CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_IDLE;

CameraCaptureSession.CaptureCallback callback =
camera.createTriggerResetCallback(triggerKey, idleValue);

callback.onCaptureCompleted(
mock(CameraCaptureSession.class), mock(CaptureRequest.class), mock(TotalCaptureResult.class));

verify(mockPreviewRequestBuilder, times(1)).set(triggerKey, idleValue);
}

@Test
public void createTriggerResetCallback_shouldResetAEPrecaptureTriggerOnCaptureFailed() {
CaptureRequest.Key<Integer> triggerKey = CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER;
int idleValue = CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_IDLE;

CameraCaptureSession.CaptureCallback callback =
camera.createTriggerResetCallback(triggerKey, idleValue);

callback.onCaptureFailed(
mock(CameraCaptureSession.class), mock(CaptureRequest.class), mock(CaptureFailure.class));

verify(mockPreviewRequestBuilder, times(1)).set(triggerKey, idleValue);
}

@Test
public void setFocusMode_shouldCallErrorOnResultOnCameraAccessException()
throws CameraAccessException {
Expand Down