安卓texture拍照实现存储

在安卓上使用TextureView进行相机预览和拍照，可以通过设置相机回调函数来实现照片存储。以下是实现步骤：

1. 获取相机服务和相机ID

CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String cameraId = cameraManager.getCameraIdList()[0]; //获取第一个相机ID

2. 打开相机并设置TextureView作为预览显示

cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
    @Override
    public void onOpened(CameraDevice camera) {
        try {
            cameraDevice = camera;
            SurfaceTexture texture = textureView.getSurfaceTexture();
            texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
            Surface surface = new Surface(texture);
            captureRequestBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            captureRequestBuilder.addTarget(surface);
            camera.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(CameraCaptureSession session) {
                    try {
                        captureSession = session;
                        captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
                        captureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                ...
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    ...
}, null);

3. 设置拍照回调函数，拍照后保存照片

captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureRequestBuilder.addTarget(imageReader.getSurface());
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
captureRequestBuilder.set(CaptureRequest.JPEG_ORIENTATION, getJpegOrientation(cameraCharacteristics, deviceOrientation));

CaptureRequest captureRequest = captureRequestBuilder.build();
captureSession.capture(captureRequest, new CameraCaptureSession.CaptureCallback() {
    @Override
    public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
        super.onCaptureCompleted(session, request, result);
        Toast.makeText(MainActivity.this, "照片已保存", Toast.LENGTH_SHORT).show();
    }
}, null);

其中，ImageReader是用来读取拍照结果的类，可以通过以下代码创建：

ImageReader imageReader = ImageReader.newInstance(imageWidth, imageHeight, ImageFormat.JPEG, 1);
imageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
    @Override
    public void onImageAvailable(ImageReader reader) {
        Image image = reader.acquireNextImage();
        ByteBuffer buffer = image.getPlanes()[0].getBuffer();
        byte[] bytes = new byte[buffer.remaining()];
        buffer.get(bytes);
        save(bytes);
        image.close();
    }
}, null);

save()函数用来保存照片到文件中，你可以自行实现该函数。注意，需要在AndroidManifest.xml文件中添加相机和存储权限。