public class CameraFragment extends Fragment implements SurfaceHolder.Callback,View.OnClickListener {
// Defined All Field
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;
private Camera camera;
private ImageView ImgThumbnail;
private Button btnFlash, btnFrontCamera, btnCapture;
private int cameraId;
private boolean flashmode = false;
private int rotation;
private String SavedImagePath;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_camera, container,false);
// Camera surface view created
cameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
btnFlash = (Button) container.findViewById(R.id.btnFlash);
btnFrontCamera = (Button) container.findViewById(R.id.btnFrontCamera);
btnCapture = (Button) container.findViewById(R.id.btnCapture);
surfaceView = (SurfaceView) container.findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
ImgThumbnail = (ImageView) container.findViewById(R.id.ImgThumbnail);
btnFrontCamera.setOnClickListener(this);
btnCapture.setOnClickListener(this);
btnFlash.setOnClickListener(this); getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
if (Camera.getNumberOfCameras() > 1) {
btnFrontCamera.setVisibility(View.VISIBLE);
}
if (!getActivity().getBaseContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
btnFlash.setVisibility(View.GONE);
}
return view;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (!openCamera(Camera.CameraInfo.CAMERA_FACING_BACK)) {
alertCameraDialog();
}
}
private boolean openCamera(int id) {
boolean result = false;
cameraId = id;
releaseCamera();
try {
camera = Camera.open(cameraId);
} catch (Exception e) {
e.printStackTrace();
}
if (camera != null) {
try {
setUpCamera(camera);
camera.setErrorCallback(new Camera.ErrorCallback() {
@Override
public void onError(int error, Camera camera) {
}
});
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
result = true;
} catch (IOException e) {
e.printStackTrace();
result = false;
releaseCamera();
}
}
return result;
}
private void setUpCamera(Camera c) {
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, cameraInfo);
rotation = getActivity().getWindowManager().getDefaultDisplay().getRotation();
int degree = 0;
switch (rotation) {
case Surface.ROTATION_0:
degree = 0;
break;
case Surface.ROTATION_90:
degree = 90;
break;
case Surface.ROTATION_180:
degree = 180;
break;
case Surface.ROTATION_270:
degree = 270;
break;
default:
break;
}
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
// Front Facing
rotation = (cameraInfo.orientation + degree) % 330;
rotation = (360 - rotation) % 360;
} else {
// Back Facing
rotation = (cameraInfo.orientation - degree + 360) % 360;
}
c.setDisplayOrientation(rotation);
Camera.Parameters params = c.getParameters();
showFlashButton(params);
List<String> focusModes = params.getSupportedFlashModes();
if (focusModes != null) { if (focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) { params.setFlashMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
}
}
params.setRotation(rotation);
}
private void showFlashButton(Camera.Parameters params) {
boolean showFlash = (getActivity().getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA_FLASH) && params.getFlashMode() != null)
&& params.getSupportedFlashModes() != null
&& params.getSupportedFocusModes().size() > 1;
btnFlash.setVisibility(showFlash ? View.VISIBLE : View.INVISIBLE);
}
private void releaseCamera() {
try {
if (camera != null) {
camera.setPreviewCallback(null);
camera.setErrorCallback(null);
camera.stopPreview();
camera.release();
camera = null;
}
} catch (Exception e) {
e.printStackTrace();
Log.e("error", e.toString());
camera = null;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnFlash:
flashOnButton();
break;
case R.id.btnFrontCamera:
flipCamera();
break;
case R.id.btnCapture:
takeImage();
break;
default:
break;
}
}
private void flashOnButton() {
if (camera != null) {
try {
Camera.Parameters param = camera.getParameters();
param.setFlashMode(!flashmode ? Camera.Parameters.FLASH_MODE_TORCH : Camera.Parameters.FLASH_MODE_OFF);
camera.setParameters(param);
flashmode = !flashmode;
Toast.makeText(getActivity(), "Flash Touch", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
// TODO: handle exception
}
}
}
private void takeImage() {
camera.takePicture(null, null, new Camera.PictureCallback() {
private File imageFile;
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
// Convert byte array into bitmap
Bitmap loadedImage = BitmapFactory.decodeByteArray(data, 0, data.length);
// rotate Image
Matrix rotateMatrix = new Matrix();
rotateMatrix.postRotate(rotation);
Bitmap rotatedBitmap = Bitmap.createBitmap(loadedImage, 0, 0, loadedImage.getWidth(), loadedImage.getHeight(), rotateMatrix, false);
final File folder;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
folder = new File(Environment.getExternalStorageDirectory() + "/CameraApp");
} else {
folder = new File(Environment.getExternalStorageDirectory() + "/CameraApp");
}
boolean success = true;
if (!folder.exists()) {
success = folder.mkdirs();
}
if (success) {
java.util.Date date = new java.util.Date();
imageFile = new File(folder.getAbsolutePath() + File.separator + new Timestamp(date.getTime()).toString() + " " + "Image.jpg");
SavedImagePath = new Timestamp(date.getTime()).toString() + " " + "Image.jpg";
imageFile.createNewFile();
} else {
Toast.makeText(getActivity().getBaseContext(), "Image Not saved", Toast.LENGTH_SHORT).show();
return;
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
// Save image into gallery
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
FileOutputStream file_out = new FileOutputStream(imageFile);
file_out.write(outputStream.toByteArray());
file_out.close();
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.MediaColumns.DATA, imageFile.getAbsolutePath()); getActivity().getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Toast.makeText(getActivity(), "Photo Captured", Toast.LENGTH_SHORT).show();
// Code For Captured Image Save in a ImageView.
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
String imagePath = folder.getAbsolutePath() + File.separator + SavedImagePath;
Uri myURI = Uri.parse(imagePath);
ImgThumbnail.setImageURI(myURI);
Toast.makeText(getActivity(), "Photo Saved on ImageView", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
private void flipCamera() {
int id = (cameraId == Camera.CameraInfo.CAMERA_FACING_BACK ? Camera.CameraInfo.CAMERA_FACING_FRONT : Camera.CameraInfo.CAMERA_FACING_BACK);
Toast.makeText(getActivity(), "Camera Mode Changing", Toast.LENGTH_SHORT).show();
if (!openCamera(id)) {
alertCameraDialog();
}
}
private void alertCameraDialog() {
AlertDialog.Builder dialog = createAlert(getActivity(), "Camera info", "Error to open camera");
dialog.setNegativeButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
dialog.show();
}
private AlertDialog.Builder createAlert(Context context, String Title, String Message) {
AlertDialog.Builder dialog = new AlertDialog.Builder(new ContextThemeWrapper(context, android.R.style.Theme_Holo_Light_Dialog));
dialog.setIcon(R.drawable.info_for_camera);
if (Title != null)
dialog.setTitle(Title);
else
dialog.setTitle("Information");
dialog.setMessage(Message);
dialog.setCancelable(false);
return dialog;
}
最佳答案
每当您发现与我的问题相同时，请执行以下操作。只需将您的 OnCreateView() 代码替换为 onViewCreated()，因为 OnCreateView() 方法仅对填充 View 有用。
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_camera, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Camera surface view created
mCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
btnFlash = (Button) view.findViewById(R.id.btnFlash);
btnFrontCamera = (Button) view.findViewById(R.id.btnFrontCamera);
btnCapture = (Button) view.findViewById(R.id.btnCapture);
surfaceView = (SurfaceView) view.findViewById(R.id.surfaceView);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
ImgThumbnail = (ImageView) view.findViewById(R.id.ImgThumbnail);
btnFrontCamera.setOnClickListener(this);
btnCapture.setOnClickListener(this);
btnFlash.setOnClickListener(this);
getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
if (Camera.getNumberOfCameras() > 1) {
btnFrontCamera.setVisibility(View.VISIBLE);
}
if (!getActivity().getBaseContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
btnFlash.setVisibility(View.GONE);
}
}
关于android - 如何解决空对象引用上的 "android.view.SurfaceView.getHolder()'”？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40926238/
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