我有三个片段，即AudioRecorderFragment，Fragment，UploadFragment是DialogFragment，另一个DialogFragment称为UploadPhotoDialog
用户应该记录来自AudioRecorderFragment的音频，然后点击上传按钮，UploadFragment显示。在UploadFragment中，用户将输入录制的音频剪辑的详细信息，并可能包含图像。选择图像时，会显示UploadPhotoDialog片段，用户可以选择是使用相机拍摄照片还是从图库中选择一张照片。我的问题是如何从UploadPhotoDialog选择回UploadFragment。我没有得到结果。此外，当我尝试从UploadFragment调用相机意图时，我在
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// get the file url
fileUri = savedInstanceState.getParcelable("file_uri");
}
。我怎么解决这个问题？
这是我的UploadFragment代码：
public class UploadFragment extends DialogFragment implements AdapterView.OnItemSelectedListener, View.OnClickListener {
Spinner genres;
ImageView photo;
TextView submit;
String fileName="";
private static final String KEY="choice";
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.fragment_upload, null);
builder.setView(v);
submit = (TextView)v.findViewById(R.id.upload_textView_submit);
genres = (Spinner) v.findViewById(R.id.upload_spinner_genre);
photo = (ImageView) v.findViewById(R.id.upload_imageView_photo);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getActivity(),
R.layout.ngoma_spinner, getResources().getStringArray(R.array.genres));
dataAdapter
.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
genres.setAdapter(dataAdapter);
Bundle bundle = this.getArguments();
if(bundle != null){
fileName = bundle.getString("arg_fileName");
}
genres.setOnItemSelectedListener(this);
submit.setOnClickListener(this);
photo.setOnClickListener(this);
return builder.create();
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
private static final int INT_CODE=1;
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.upload_textView_submit:
getDialog().dismiss();
break;
case R.id.upload_imageView_photo:
UploadPhotoDialog uploadDialog = new UploadPhotoDialog();
uploadDialog.setTargetFragment(this, INT_CODE);
uploadDialog.show(getActivity().getSupportFragmentManager(), "uploadPhoto");
break;
}
}
/******************************************************************************************************/
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
public static final int MEDIA_TYPE_IMAGE = 1;
private static int RESULT_LOAD_IMAGE = 1;
/**
* Select image from gallery
*/
private void selectFromGallery() {
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
/**
* Capturing Camera Image will lauch camera app requrest image capture
*/
private void captureImage() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
// start the image capture Intent
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}
/**
* Here we store the file url as it will be null after returning from camera
* app
*/
// directory name to store captured images and videos
private static final String IMAGE_DIRECTORY_NAME = "ngoma";
private Uri fileUri; // file url to store image/video
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// save file url in bundle as it will be null on screen orientation
// changes
outState.putParcelable("file_uri", fileUri);
}
/*
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// get the file url
fileUri = savedInstanceState.getParcelable("file_uri");
}*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// get the file url
// fileUri = savedInstanceState.getParcelable("file_uri");
}
/**
* Receiving activity result method will be called after closing the camera
* */
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode,resultCode, data);
// if the result is capturing Image
if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK) {
// successfully captured the image
// display it in image view
previewCapturedImage();
} else if (resultCode == Activity.RESULT_CANCELED) {
// user cancelled Image capture
Toast.makeText(getActivity().getApplicationContext(),
"User cancelled image capture", Toast.LENGTH_SHORT)
.show();
} else {
// failed to capture image
Toast.makeText(getActivity().getApplicationContext(),
"Sorry! Failed to capture image", Toast.LENGTH_SHORT)
.show();
}
} else if (requestCode == RESULT_LOAD_IMAGE && resultCode == Activity.RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getActivity().getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
// String picturePath contains the path of selected Image
previewFromGallery(picturePath);
}
if (requestCode == INT_CODE) { //make sure fragment codes match up {
String choice = data.getStringExtra(KEY);
if(choice.equalsIgnoreCase("camera")){
captureImage();
}
else if(choice.equalsIgnoreCase("gallery")){
selectFromGallery();
}
}
}
/**
* Display image from a path to ImageView
*/
private void previewCapturedImage() {
try {
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// downsizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
options);
photo.setImageBitmap(bitmap);
} catch (NullPointerException e) {
e.printStackTrace();
}
}
private void previewFromGallery(String picturePath) {
photo.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
/**
* ------------ Helper Methods ----------------------
* */
/**
* Creating file uri to store image/video
*/
public Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(type));
}
/**
* returning image / video
*/
private static File getOutputMediaFile(int type) {
// External sdcard location
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
IMAGE_DIRECTORY_NAME);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(IMAGE_DIRECTORY_NAME, "Oops! Error creating "
+ IMAGE_DIRECTORY_NAME + " directory.");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_" + timeStamp + ".jpg");
} else {
return null;
}
return mediaFile;
}
}
和UploadPhotoDialog片段代码
public class UploadPhotoDialog extends DialogFragment implements View.OnClickListener {
LinearLayout fromgallery, fromcamera;
String choice;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// Get the layout inflater
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.fragment_uploadphoto_dialog, null);
// Inflate and set the layout for the dialog
// Pass null as the parent view because its going in the dialog layout
choice = "";
builder.setView(v);
fromgallery = (LinearLayout) v
.findViewById(R.id.uploadphoto_gallery_layout);
fromcamera = (LinearLayout) v
.findViewById(R.id.uploadphoto_camera_layout);
fromcamera.setOnClickListener(this);
fromgallery.setOnClickListener(this);
return builder.create();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.uploadphoto_gallery_layout:
// Intent intent = new Intent(getActivity(), AudioRecorder.class);
//startActivity(intent);
//AudioRecorderFragment audioRecorder= new AudioRecorderFragment();
//getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.content_frame,audioRecorder).commit();
choice ="gallery";
getDialog().dismiss();
break;
case R.id.uploadphoto_camera_layout:
//Intent intentVideo = new Intent(getActivity(), VideoRecorderActivity.class);
//startActivity(intentVideo);
choice ="camera";
getDialog().dismiss();
break;
}
}
private static final String KEY="choice";
private static final int INT_CODE=1;
private void sendResult(int INT_CODE) {
Intent i = new Intent();
i.putExtra(KEY, choice);
getTargetFragment().onActivityResult(getTargetRequestCode(), INT_CODE, i);
}
}
抱歉，我知道很多代码，但这是我表达问题的最佳方式。 帮助将受到高度赞赏。
提前致谢。
答案 0 :(得分：0)
当您展示片段时，您还可以通过片段的setArguments函数传递数据，或者通过在两个片段之间建立接口来实现这一点：
public Interface IReceiveChoice {
void Selected(int choice);
}
然后在课程中你要选择实施IReceiveChoice;
public class UploadPhotoDialog extends DialogFragment implements View.OnClickListener, IReceiveChoice {
@Override
public void Selected(int choice) {
//do stuff
}
....
当您在第一个活动中选择另一个活动时，将其转换为IReceiveChoice并根据您的选择调用选择的方法。
Fragment f = getTargetFragment();
if(f != null && f instanceof IReceiveChoice) {
f.Selected(choice);
}
在那里你必须确保片段存在，但如果你的数据很小而且很简单，它可以替代在任何地方发送大量的包。