Question

我需要一些帮助帮助我正在使用一个应用程序可以自动拍照使用主摄像头的活动但我想使用前置摄像头而不是主摄像头你能告诉我如何使用前置摄像头

这是我的代码

public class TakePicture extends Activity implements SurfaceHolder.Callback
{
    //a variable to store a reference to the Image View at the main.xml file
    private ImageView iv_image;
    //a variable to store a reference to the Surface View at the main.xml file
    private SurfaceView sv;

    //a bitmap to display the captured image
    private Bitmap bmp;

    //Camera variables
    //a surface holder
    private SurfaceHolder sHolder;  
    //a variable to control the camera
    private Camera mCamera;
    //the camera parameters
    private Parameters parameters;


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //get the Image View at the main.xml file
        iv_image = (ImageView) findViewById(R.id.imageView);

        //get the Surface View at the main.xml file
        sv = (SurfaceView) findViewById(R.id.surfaceView);

        //Get a surface
        sHolder = sv.getHolder();

        //add the callback interface methods defined below as the Surface View callbacks
        sHolder.addCallback(this);

        //tells Android that this surface will have its data constantly replaced
        sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    @Override
    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) 
    {
         //get camera parameters
         parameters = mCamera.getParameters();

         //set camera parameters
         mCamera.setParameters(parameters);
         mCamera.startPreview();

         //sets what code should be executed after the picture is taken
         Camera.PictureCallback mCall = new Camera.PictureCallback() 
         {
             @Override
             public void onPictureTaken(byte[] data, Camera camera) 
             {
                 //decode the data obtained by the camera into a Bitmap
                 bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
                 //set the iv_image

                 iv_image.setImageBitmap(bmp);
                 TakePicture t=new TakePicture();
                 t.SaveBitmap(bmp);
                // SendEmail(bmp);
             }


         };

         mCamera.takePicture(null, null, mCall);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) 
    {
        // The Surface has been created, acquire the camera and tell it where
        // to draw the preview.
        mCamera = Camera.open();
        try {
           mCamera.setPreviewDisplay(holder);

        } catch (IOException exception) {
            mCamera.release();
            mCamera = null;
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) 
    {
        //stop the preview
        mCamera.stopPreview();
        //release the camera
        mCamera.release();
        //unbind the camera from this object
        mCamera = null;
    }

Answer 1

public void openFrontFacingCamera() {
        numberOfCamera = Camera.getNumberOfCameras();
        if(camId == Camera.CameraInfo.CAMERA_FACING_BACK){
            camId = Camera.CameraInfo.CAMERA_FACING_FRONT;
            Toast.makeText(getApplicationContext(), "BACK TO FRONT" ,
1000).show();
                try {
                    camera.release();
                    camera = Camera.open(camId);
                    camera.setPreviewDisplay(surfaceHolder);
                    camera.startPreview();
                    previewing = true;
                } catch (RuntimeException e) {

            } catch (IOException e) {}
        }else if(camId == Camera.CameraInfo.CAMERA_FACING_FRONT){
            camId = Camera.CameraInfo.CAMERA_FACING_BACK;
            Toast.makeText(getApplicationContext(), "FRONT TO BACK" , 



 1000).show();
                    try {
                        camera.release();
                        camera = Camera.open(camId);
                        camera.setPreviewDisplay(surfaceHolder);
                        camera.startPreview();
                    } catch (RuntimeException e) {

            } catch (IOException e) {}
        }
    }

希望这个功能能帮助你

Answer 2

变化

mCamera = Camera.open();

到

mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);

如何在Android中使用前置摄像头

2 个答案: