我有这个活动（MakePhotoActivity）类，可以在您打开应用程序时拍照。我已将其设置为使用前置摄像头。
然后我有另一个类，它是一个已经在工作的 SMS 广播接收器。
现在，我想让它在收到短信时，使用我当前的班级拍照。但是我怎样才能将它们整合在一起呢？
当我尝试将方法（surfaceChanged 等）复制到我的广播接收器类时，在接收短信时，我将代码放在 onCreate 内（在 MakePhotoActivity 中）。它不工作。
public class MakePhotoActivity 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;
private int cameraId = 0;
//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);
}
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
Log.d("A", "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
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()
{
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);
FileOutputStream outStream = null;
try{
outStream = new FileOutputStream("/sdcard/Image"+System.currentTimeMillis()+".jpg");
outStream.write(data);
outStream.close();
} catch (FileNotFoundException e){
Log.d("CAMERA", e.getMessage());
} catch (IOException e){
Log.d("CAMERA", e.getMessage());
}
}
};
mCamera.takePicture(null, null, mCall);
}
public void surfaceCreated(SurfaceHolder holder)
{
// The Surface has been created, acquire the camera and tell it where
// to draw the preview.
if (mCamera == null) {
cameraId = findFrontFacingCamera();
mCamera = Camera.open(cameraId);
try {
mCamera.setPreviewDisplay(holder);
// TODO test how much setPreviewCallbackWithBuffer is faster
// mCamera.setPreviewCallback((PreviewCallback) this);
} catch (IOException e) {
mCamera.release();
mCamera = null;
}
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
if (mCamera != null) {
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if (mCamera!=null)
{
mCamera.stopPreview();
mCamera.release();
mCamera=null;
}
}
}
更新：这就是我所做的。投入服务，但我得到一个错误，说应用程序通过了 NULL 表面，相机服务器死了！，ICamera 死了，错误 100。
我引用了http://easyandroidtutorials.blogspot.in/2012/09/capture-image-without-preview-as.html中的代码并做了一些小改动，仍然无法工作。
public class CameraService extends Service
{
//Camera variables
//a surface holder
private SurfaceHolder sHolder;
//a variable to control the camera
private Camera mCamera;
//the camera parameters
private Parameters parameters;
SurfaceView sv;
private int cameraId = 0;
/** Called when the activity is first created. */
@Override
public void onCreate()
{
super.onCreate();
Log.i("Service", "Service started");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
try {
if (mCamera == null) {
cameraId = findFrontFacingCamera();
mCamera = Camera.open(cameraId);
try {
// Thread.sleep(3000);
sv = new SurfaceView(getApplicationContext());
mCamera.setPreviewDisplay(sv.getHolder());
parameters = mCamera.getParameters();
//set camera parameters
mCamera.setParameters(parameters);
mCamera.startPreview();
mCamera.takePicture(null, null, mCall);
} catch (IOException e) {
// TODO Auto-generated catch block
mCamera.release();
mCamera = null;
e.printStackTrace();
}
//Get a surface
//sHolder = sv.getHolder();
//tells Android that this surface will have its data constantly replaced
// sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
} catch (Exception e) {
e.printStackTrace();
}
return Service.START_STICKY;
}
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
Log.d("A", "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
Camera.PictureCallback mCall = new Camera.PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
//decode the data obtained by the camera into a Bitmap
FileOutputStream outStream = null;
try{
outStream = new FileOutputStream("/sdcard/Image.jpg");
outStream.write(data);
outStream.close();
} catch (FileNotFoundException e){
Log.d("CAMERA", e.getMessage());
} catch (IOException e){
Log.d("CAMERA", e.getMessage());
}
}
};
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
有人对此有任何帮助吗？谢谢。