public class Preview extends SurfaceView implements
SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Preview(Context context) {
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
Camera.Parameters parameters=mCamera.getParameters();
parameters.setPictureFormat(PixelFormat.JPEG);
parameters.setPictureSize(420, 320);
mCamera.setParameters(parameters);
mCamera.setPreviewCallback(previewCallback);
mCamera.takePicture(shutterCallback, pictureCallback,
jpegPictureCallback);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
private PreviewCallback previewCallback = new PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
Log.i("Preview", "onPreviewFrame");
}
};
int i = 0;
private ShutterCallback shutterCallback = new ShutterCallback() {
@Override
public void onShutter() {
Log.i("Preview", "onShutter");
if (++i > 1) {
mCamera.stopPreview();
}
}
};
private PictureCallback pictureCallback = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.i("Preview", "onPictureTaken");
}
};
private byte[] picData;
private PictureCallback jpegPictureCallback = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
picData = data;
Log.i("Preview", "onPictureTaken jpeg");
}
};
public String getPicture() throws IOException {
//mCamera.takePicture(shutterCallback,pictureCallback,
jpegPictureCallback);
mCamera.takePicture(shutterCallback, pictureCallback,
jpegPictureCallback);
if (picData == null) {
return null;
}
int bytelength=picData.length;
int length=1024;
String dataString = new SimpleDateFormat("yyyy-mm-dd
HH:mm:ss").format(Calendar.getInstance().getTime());
dataString=dataString.replaceAll("\\s", "");
dataString=dataString.replaceAll(":", "");
String pathString="/sdcard/"+dataString+".jpg";
FileOutputStream fos = null;
try {
fos=new FileOutputStream(pathString);
int offset=0;
while(offset+length<bytelength){
fos.write(picData, offset, length);
offset+=length;
}
fos.write(picData, offset, bytelength-offset);
} catch (Exception e) {
Log.e("ww",e.toString());
}finally{
fos.close();
}
return pathString;
}
public void cancel() {
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the
// preview.
// Because the CameraDevice object is not a shared resource,
// it's very
// important to release it when the activity is paused.
if (mCamera != null) {
mCamera.stopPreview();
mCamera = null;
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int w,
int h) {
// Now that the size is known, set up the camera parameters
// and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(w, h);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
And when toggle a breakpoint in the private ShutterCallback
shutterCallback = new ShutterCallback(),it hasn't been implemented.
So when I invoke the getPicture outside ,the picture is black and the
pisdata is null.
Why this happen?Where did i do wrong?
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