要实现Android相机的光学稳定化,可以使用Camera2 API来控制相机的参数和功能。下面是一个简单的代码示例,展示如何启用相机的光学稳定化功能。
首先,你需要在Manifest文件中添加相机的权限:
然后,在Activity或Fragment中,你需要初始化相机的相关组件和回调:
private CameraManager cameraManager;
private String cameraId;
private CameraDevice cameraDevice;
private CaptureRequest.Builder captureRequestBuilder;
private CameraCaptureSession cameraCaptureSession;
private ImageReader imageReader;
// 初始化相机
private void initCamera() {
cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String[] cameraIds = cameraManager.getCameraIdList();
// 获取后置相机ID
for (String id : cameraIds) {
CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(id);
if (characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK) {
cameraId = id;
break;
}
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
// 打开相机
private void openCamera() {
try {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice camera) {
cameraDevice = camera;
createCaptureSession();
}
@Override
public void onDisconnected(@NonNull CameraDevice camera) {
cameraDevice.close();
cameraDevice = null;
}
@Override
public void onError(@NonNull CameraDevice camera, int error) {
cameraDevice.close();
cameraDevice = null;
}
}, null);
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
// 创建相机捕获会话
private void createCaptureSession() {
try {
Surface surface = imageReader.getSurface();
captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureRequestBuilder.addTarget(surface);
cameraDevice.createCaptureSession(Collections.singletonList(surface), new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
cameraCaptureSession = session;
updatePreview();
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession session) {
// 配置失败处理
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
// 更新预览
private void updatePreview() {
try {
// 开启光学稳定化
captureRequestBuilder.set(CaptureRequest.CONTROL_VIDEO_STABILIZATION_MODE, CaptureRequest.CONTROL_VIDEO_STABILIZATION_MODE_ON);
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
// 关闭相机
private void closeCamera() {
if (cameraCaptureSession != null) {
cameraCaptureSession.close();
cameraCaptureSession = null;
}
if (cameraDevice != null) {
cameraDevice.close();
cameraDevice = null;
}
if (imageReader != null) {
imageReader.close();
imageReader = null;
}
}
在这个示例中,我们首先使用CameraManager获取后置相机的ID。然后,在打开相机时,我们使用CameraDevice.StateCallback来处理相机的打开、断开和错误事件。
在创建相机捕获会话时,我们创建了一个ImageReader来接收相机捕获的图像。在更新预览时,通过设置CaptureRequest的CONTROL_VIDEO_STABILIZATION_MODE参数来启用光学稳定化。
最后,在关闭相机时,我们需要释放相机的相关资源。
请注意,这只是一个简单的示例代码,仅展示了如何启用相机的光学稳定化功能。实际的实现可能会因设备和需求的不同而有所不同。
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