Android >> Stages of a fragment
public class CrimeFragment extends Fragment {
public static final String EXTRA_CRIME_ID = "criminalintent.CRIME_ID";
private static final String DIALOG_DATE = "date";
private static final String DIALOG_IMAGE = "image";
private static final int REQUEST_DATE = 0;
private static final int REQUEST_PHOTO = 1;
private static final int REQUEST_CONTACT = 2;
Crime mCrime;
EditText mTitleField;
Button mDateButton;
CheckBox mSolvedCheckBox;
ImageButton mPhotoButton;
ImageView mPhotoView;
Button mSuspectButton;
Callbacks mCallbacks;
public static CrimeFragment newInstance(UUID crimeId) {
Bundle args = new Bundle();
args.putSerializable(EXTRA_CRIME_ID, crimeId);
CrimeFragment fragment = new CrimeFragment();
fragment.setArguments(args);
return fragment;
}
//onAttach and onDetach are where we initialize/nullify callback variable to call back the boss activity
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mCallbacks = (Callbacks)activity;
}
//onCreate is where fragment's variables are initialized from the savedInstanceState
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UUID crimeId = (UUID)getArguments().getSerializable(EXTRA_CRIME_ID);
mCrime = CrimeLab.get(getActivity()).getCrime(crimeId);
setHasOptionsMenu(true);
}
@Override
@TargetApi(11)
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_crime, parent, false);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
}
mTitleField = (EditText)v.findViewById(R.id.crime_title);
mTitleField.setText(mCrime.getTitle());
mTitleField.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence c, int start, int before, int count) {
mCrime.setTitle(c.toString());
mCallbacks.onCrimeUpdated(mCrime);
}
public void beforeTextChanged(CharSequence c, int start, int count, int after) {
// this space intentionally left blank
}
public void afterTextChanged(Editable c) {
// this one too
}
});
mSolvedCheckBox = (CheckBox)v.findViewById(R.id.crime_solved);
mSolvedCheckBox.setChecked(mCrime.isSolved());
mSolvedCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set the crime's solved property
mCrime.setSolved(isChecked);
mCallbacks.onCrimeUpdated(mCrime);
}
});
mDateButton = (Button)v.findViewById(R.id.crime_date);
updateDate();
mDateButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
FragmentManager fm = getActivity()
.getSupportFragmentManager();
DatePickerFragment dialog = DatePickerFragment
.newInstance(mCrime.getDate());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_DATE);
dialog.show(fm, DIALOG_DATE);
}
});
mPhotoButton = (ImageButton)v.findViewById(R.id.crime_imageButton);
mPhotoButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// launch the camera activity
Intent i = new Intent(getActivity(), CrimeCameraActivity.class);
startActivityForResult(i, REQUEST_PHOTO);
}
});
// if camera is not available, disable camera functionality
PackageManager pm = getActivity().getPackageManager();
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA) &&
!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
mPhotoButton.setEnabled(false);
}
mPhotoView = (ImageView)v.findViewById(R.id.crime_imageView);
mPhotoView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Photo p = mCrime.getPhoto();
if (p == null)
return;
FragmentManager fm = getActivity()
.getSupportFragmentManager();
String path = getActivity()
.getFileStreamPath(p.getFilename()).getAbsolutePath();
ImageFragment.createInstance(path)
.show(fm, DIALOG_IMAGE);
}
});
mSuspectButton = (Button)v.findViewById(R.id.crime_suspectButton);
mSuspectButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
startActivityForResult(i, REQUEST_CONTACT);
}
});
if (mCrime.getSuspect() != null) {
mSuspectButton.setText(mCrime.getSuspect());
}
Button reportButton = (Button)v.findViewById(R.id.crime_reportButton);
reportButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_TEXT, getCrimeReport());
i.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.crime_report_subject));
i = Intent.createChooser(i, getString(R.string.send_report));
startActivity(i);
}
});
return v;
}
//Show/hide photos is taken care of in onStart and on onStop because they mark the point when the activity can be
//seen by user
@Override
public void onStart() {
super.onStart();
showPhoto();
}
//onPause is the safest stage to save objects because paused activity may be destroyed by the OS to reclaim memory
@Override
public void onPause() {
super.onPause();
CrimeLab.get(getActivity()).saveCrimes();
}
@Override
public void onStop() {
super.onStop();
PictureUtils.cleanImageView(mPhotoView);
}
@Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != Activity.RESULT_OK) return;
if (requestCode == REQUEST_DATE) {
Date date = (Date)data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);
mCrime.setDate(date);
mCallbacks.onCrimeUpdated(mCrime);
updateDate();
} else if (requestCode == REQUEST_PHOTO) {
// create a new Photo object and attach it to the crime
String filename = data
.getStringExtra(CrimeCameraFragment.EXTRA_PHOTO_FILENAME);
if (filename != null) {
Photo p = new Photo(filename);
mCrime.setPhoto(p);
mCallbacks.onCrimeUpdated(mCrime);
showPhoto();
}
} else if (requestCode == REQUEST_CONTACT) {
Uri contactUri = data.getData();
String[] queryFields = new String[] { ContactsContract.Contacts.DISPLAY_NAME_PRIMARY };
Cursor c = getActivity().getContentResolver()
.query(contactUri, queryFields, null, null, null);
if (c.getCount() == 0) {
c.close();
return;
}
c.moveToFirst();
String suspect = c.getString(0);
mCrime.setSuspect(suspect);
mCallbacks.onCrimeUpdated(mCrime);
mSuspectButton.setText(suspect);
c.close();
}
}
public void updateDate() {
mDateButton.setText(mCrime.getDate().toString());
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(getActivity());
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void showPhoto() {
// (re)set the image button's image based on our photo
Photo p = mCrime.getPhoto();
BitmapDrawable b = null;
if (p != null) {
String path = getActivity()
.getFileStreamPath(p.getFilename()).getAbsolutePath();
b = PictureUtils.getScaledDrawable(getActivity(), path);
}
mPhotoView.setImageDrawable(b);
}
private String getCrimeReport() {
String solvedString = null;
if (mCrime.isSolved()) {
solvedString = getString(R.string.crime_report_solved);
} else {
solvedString = getString(R.string.crime_report_unsolved);
}
String dateFormat = "EEE, MMM dd";
String dateString = DateFormat.format(dateFormat, mCrime.getDate()).toString();
String suspect = mCrime.getSuspect();
if (suspect == null) {
suspect = getString(R.string.crime_report_no_suspect);
} else {
suspect = getString(R.string.crime_report_suspect, suspect);
}
String report = getString(R.string.crime_report, mCrime.getTitle(), dateString, solvedString, suspect);
return report;
}
}