在Camera2 API片段中捕获并预览显示到图像视图的步骤如下:
<uses-permission android:name="android.permission.CAMERA" />
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String[] cameraIds = cameraManager.getCameraIdList();
cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice camera) {
// 相机设备打开成功,可以进行后续操作
// 创建CameraCaptureSession并进行相机预览操作
}
@Override
public void onDisconnected(@NonNull CameraDevice camera) {
// 相机设备断开连接,释放资源
}
@Override
public void onError(@NonNull CameraDevice camera, int error) {
// 相机设备打开失败,释放资源
}
}, null);
// 创建SurfaceTexture对象,并与图像视图关联
SurfaceTexture surfaceTexture = imageView.getSurfaceTexture();
Surface previewSurface = new Surface(surfaceTexture);
// 创建CaptureRequest.Builder对象,并设置预览目标Surface
CaptureRequest.Builder previewRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
previewRequestBuilder.addTarget(previewSurface);
// 创建CameraCaptureSession并发送预览请求
cameraDevice.createCaptureSession(Arrays.asList(previewSurface), new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
// CameraCaptureSession创建成功,可以发送预览请求
session.setRepeatingRequest(previewRequestBuilder.build(), null, null);
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession session) {
// CameraCaptureSession创建失败,释放资源
}
}, null);
通过以上步骤,你可以在Camera2 API片段中成功捕获相机预览数据,并将其显示到图像视图上。
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