首页 用 android camera2 实现拍照录像视频和开启闪光灯

用 android camera2 实现拍照录像视频和开启闪光灯

上传者： ddffjjyy | 上传时间： 2024-07-12 14:31:39 | 文件大小： 11.34MB | 文件类型： RAR
在Android平台上，开发一款能够拍照、录像以及控制闪光灯的应用是一项常见的需求。`camera2` API是Android系统提供的一种高级相机接口，它为开发者提供了更精细的控制权，以实现复杂的相机功能。在这个名为"TestCamera"的Android Studio工程中，我们将深入探讨如何使用`camera2` API来实现这些功能。 我们需要在AndroidManifest.xml文件中添加必要的权限，以允许应用访问相机和录制视频： ```xml ``` 接下来，我们创建一个`CameraActivity`，在这个活动中初始化相机，并设置预览界面。这通常涉及到设置SurfaceView或TextureView作为相机的预览展示区： ```java private CameraManager cameraManager; private SurfaceView surfaceView; private TextureView textureView; // 可选，根据需求选择 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); surfaceView = findViewById(R.id.surface_view); textureView = findViewById(R.id.texture_view); // 如果使用TextureView cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { String cameraId = cameraManager.getCameraIdList()[0]; // 获取第一个摄像头 cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {/*...*/}, null); } catch (CameraAccessException e) { e.printStackTrace(); } } ``` 在`StateCallback`中，我们需要实现打开、关闭相机的逻辑，以及设置预览会话和捕获器： ```java public class CameraStateCallback extends CameraDevice.StateCallback { @Override public void onOpened(@NonNull CameraDevice camera) { camera.createPreviewSession(setupPreviewSession(camera)); } private CameraCaptureSession.Callback setupPreviewSession(CameraDevice camera) {/*...*/} } ``` 对于拍照功能，我们需要创建一个`CaptureRequest.Builder`，设置适当的参数，然后提交请求到预览会话： ```java private void takePicture() { final CaptureRequest.Builder captureBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); captureBuilder.addTarget(imageReader.getSurface()); // imageReader用于保存图片 CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() {/*...*/}; camera.createCaptureSession(Arrays.asList(captureBuilder.addTarget(surfaceView.getHolder().getSurface())), captureCallback, null); captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH); // 开启闪光灯 camera.capture(captureBuilder.build(), captureCallback, null); } ``` 录像功能则需要用到`MediaRecorder`，配置并启动它来记录视频： ```java private void startRecording() { MediaRecorder mediaRecorder = new MediaRecorder(); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString()); mediaRecorder.setVideoSize(width, height); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC); mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface()); try { mediaRecorder.prepare(); mediaRecorder.start(); } catch (IOException e) { e.printStackTrace(); } } private File getOutputMediaFile(int type) {/*...*/} // 创建保存视频的文件 ``` 控制闪光灯的状态可以通过调用`CameraCharacteristics`的`FLASH_MODE`来实现： ```java CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { String cameraId = cameraManager.getCameraIdList()[0]; CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId); StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP); Integer flashMode = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE); if (flashMode != null && flashMode == 1) { // 检查相机是否支持闪光灯 if (isFlashOn) { cameraManager.setTorchMode(cameraId, false); // 关闭闪光灯 } else { cameraManager.setTorchMode(cameraId, true); // 打开闪光灯 } } } catch (CameraAccessException e) { e.printStackTrace(); } ``` 在实际应用中，还需要处理各种异常情况，比如权限问题、设备不支持等问题。此外，为了提供良好的用户体验，需要实现UI交互，如按钮点击事件，以触发拍照、录像和切换闪光灯操作。通过以上步骤，我们可以使用Android的`camera2` API创建一个功能完善的拍照、录像和控制闪光灯的应用。

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