Here is my solution:
CrimeListFragment.java
package com.bignerdranch.android.criminalintent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.List;
public class CrimeListFragment extends Fragment {
private int clickedCrimePosition;
private static final String CLICKED_CRIME_POSITION_ID = "clicked_crime_position_id";
private static final int REQUEST_CRIME = 1;
private RecyclerView mCrimeRecyclerView;
private CrimeAdapter mAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_crime_list, container, false);
mCrimeRecyclerView = (RecyclerView) view.findViewById(R.id.crime_recycler_view);
mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
if (savedInstanceState != null) {
clickedCrimePosition = savedInstanceState.getInt(CLICKED_CRIME_POSITION_ID);
}
return view;
}
@Override
public void onResume() {
super.onResume();
updateUI();
}
private void updateUI() {
CrimeLab crimeLab = CrimeLab.get(getActivity());
List<Crime> crimes = crimeLab.getCrimes();
if (mAdapter == null) {
mAdapter = new CrimeAdapter(crimes);
mCrimeRecyclerView.setAdapter(mAdapter);
} else {
mAdapter.notifyItemChanged(clickedCrimePosition);
}
}
private class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView mTitleTextView;
private TextView mDateTextView;
private ImageView mSolvedImageView;
private Crime mCrime;
public CrimeHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.list_item_crime, parent, false));
itemView.setOnClickListener(this);
mTitleTextView = (TextView) itemView.findViewById(R.id.crime_title);
mDateTextView = (TextView) itemView.findViewById(R.id.crime_date);
mSolvedImageView = (ImageView) itemView.findViewById(R.id.crime_solved);
}
public void bind(Crime crime) {
mCrime = crime;
mTitleTextView.setText(mCrime.getTitle());
DateFormat dateFormat = new SimpleDateFormat(CrimeFragment.DATE_FORMAT);
DateFormat timeFormat = new SimpleDateFormat(CrimeFragment.TIME_FORMAT);
mDateTextView.setText(dateFormat.format(mCrime.getDate()) + " " + timeFormat.format(mCrime.getTime()));
mSolvedImageView.setVisibility(crime.isSolved() ? View.VISIBLE : View.GONE);
}
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
@Override
public void onClick(View v) {
clickedCrimePosition = getAdapterPosition();
Intent intent = CrimePagerActivity.newIntent(getActivity(), mCrime.getID());
startActivityForResult(intent, REQUEST_CRIME);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CRIME) {
// Handle result
}
}
private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> {
private List<Crime> mCrimes;
public CrimeAdapter(List<Crime> crimes) {
mCrimes = crimes;
}
/**
* Called when RecyclerView needs a new {@link CrimeHolder} of the given type to represent
* an item.
* <p>
* This new ViewHolder should be constructed with a new View that can represent the items
* of the given type. You can either create a new View manually or inflate it from an XML
* layout file.
* <p>
* The new ViewHolder will be used to display items of the adapter using
* {@link #onBindViewHolder(CrimeHolder, int)}. Since it will be re-used to display
* different items in the data set, it is a good idea to cache references to sub views of
* the View to avoid unnecessary {@link View#findViewById(int)} calls.
*
* @param parent The ViewGroup into which the new View will be added after it is bound to
* an adapter position.
* @param viewType The view type of the new View.
* @return A new ViewHolder that holds a View of the given view type.
* @see #getItemViewType(int)
* @see #onBindViewHolder(CrimeHolder, int)
*/
@Override
public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
return new CrimeHolder(layoutInflater, parent);
}
/**
* Called by RecyclerView to display the data at the specified position. This method should
* update the contents of the {@link CrimeHolder#itemView} to reflect the item at the given
* position.
* <p>
* Note that unlike {@link ListView}, RecyclerView will not call this method
* again if the position of the item changes in the data set unless the item itself is
* invalidated or the new position cannot be determined. For this reason, you should only
* use the <code>position</code> parameter while acquiring the related data item inside
* this method and should not keep a copy of it. If you need the position of an item later
* on (e.g. in a click listener), use {@link CrimeHolder#getAdapterPosition()} which will
* have the updated adapter position.
* <p>
* Override {@link #onBindViewHolder(CrimeHolder, int)} instead if Adapter can
* handle efficient partial bind.
*
* @param holder The ViewHolder which should be updated to represent the contents of the
* item at the given position in the data set.
* @param position The position of the item within the adapter's data set.
*/
@Override
public void onBindViewHolder(CrimeHolder holder, int position) {
Crime crime = mCrimes.get(position);
holder.bind(crime);
}
/**
* Returns the total number of items in the data set held by the adapter.
*
* @return The total number of items in this adapter.
*/
@Override
public int getItemCount() {
return mCrimes.size();
}
}
@Override
public void onSaveInstanceState(Bundle onSavedInstanceState) {
super.onSaveInstanceState(onSavedInstanceState);
onSavedInstanceState.putSerializable(CLICKED_CRIME_POSITION_ID, clickedCrimePosition);
}
}
CrimeFragment.java
package com.bignerdranch.android.criminalintent;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
import static android.widget.CompoundButton.*;
public class CrimeFragment extends Fragment {
public static final String DATE_FORMAT = "EEE MMM dd yyyy";
public static final String TIME_FORMAT = "hh:mm a z";
private static final String ARG_CRIME_ID = "crime_id";
private static final String DIALOG_DATE = "DialogDate";
private static final String DIALOG_TIME = "DialogTime";
private static final int REQUEST_DATE = 0;
private static final int REQUEST_TIME = 1;
private Crime mCrime;
private EditText mTitleField;
private Button mDateButton;
private Button mTimeButton;
private CheckBox mSolvedCheckBox;
public static CrimeFragment newInstace(UUID crimeId) {
Bundle args = new Bundle();
args.putSerializable(ARG_CRIME_ID, crimeId);
CrimeFragment fragment = new CrimeFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UUID crimeId = (UUID) getArguments().getSerializable(ARG_CRIME_ID);
mCrime = CrimeLab.get(getActivity()).getCrime(crimeId);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_crime, container, false);
mTitleField = (EditText) v.findViewById(R.id.crime_title);
mTitleField.setText(mCrime.getTitle());
mTitleField.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// This space intentionally left blank
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
mCrime.setTitle(s.toString());
}
@Override
public void afterTextChanged(Editable s) {
// This one too
}
});
mDateButton = (Button) v.findViewById(R.id.crime_date);
updateDate();
mDateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager manager = getFragmentManager();
DatePickerFragment dialog = DatePickerFragment.newInstance(mCrime.getDate());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_DATE);
dialog.show(manager, DIALOG_DATE);
}
});
mTimeButton = (Button) v.findViewById(R.id.crime_time);
updateTime();
mTimeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager manager = getFragmentManager();
TimePickerFragment dialog = TimePickerFragment.newInstance(mCrime.getTime());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_TIME);
dialog.show(manager, DIALOG_TIME);
}
});
mSolvedCheckBox = (CheckBox) v.findViewById(R.id.crime_solved);
mSolvedCheckBox.setChecked(mCrime.isSolved());
mSolvedCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mCrime.setSolved(isChecked);
}
});
return v;
}
@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);
updateDate();
}
if (requestCode == REQUEST_TIME) {
Date time = (Date) data.getSerializableExtra(TimePickerFragment.EXTRA_TIME);
mCrime.setTime(time);
updateTime();
}
}
private void updateDate() {
DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
mDateButton.setText(dateFormat.format(mCrime.getDate()));
}
private void updateTime() {
DateFormat timeFormat = new SimpleDateFormat(TIME_FORMAT);
mTimeButton.setText(timeFormat.format(mCrime.getTime()));
}
}
Crime.java
package com.bignerdranch.android.criminalintent;
import java.util.Date;
import java.util.UUID;
public class Crime {
private UUID mID;
private String mTitle;
private Date mDate;
private Date mTime;
private boolean mSolved;
public Crime() {
mID = UUID.randomUUID();
mDate = new Date();
mTime = new Date();
}
public UUID getID() {
return mID;
}
public String getTitle() {
return mTitle;
}
public void setTitle(String title) {
mTitle = title;
}
public Date getDate() {
return mDate;
}
public void setDate(Date date) {
mDate = date;
}
public Date getTime() {
return mTime;
}
public void setTime(Date time) {
mTime = time;
}
public boolean isSolved() {
return mSolved;
}
public void setSolved(boolean solved) {
mSolved = solved;
}
}
TimePickerFragment.java
package com.bignerdranch.android.criminalintent;
import android.app.Activity;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.AlertDialog;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TimePicker;
import java.util.Calendar;
import java.util.Date;
public class TimePickerFragment extends DialogFragment {
public static final String EXTRA_TIME = "com.bignerdranch.android.criminalintent.time";
private static final String ARG_TIME = "time";
private TimePicker mTimePicker;
public static TimePickerFragment newInstance(Date time) {
Bundle args = new Bundle();
args.putSerializable(ARG_TIME, time);
TimePickerFragment fragment = new TimePickerFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Date time = (Date) getArguments().getSerializable(ARG_TIME);
Calendar calendar = Calendar.getInstance();
calendar.setTime(time);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
View v = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_time, null);
mTimePicker = (TimePicker) v.findViewById(R.id.dialog_time_picker);
mTimePicker.setCurrentHour(hour);
mTimePicker.setCurrentMinute(minute);
return new AlertDialog.Builder(getActivity())
.setView(v)
.setTitle(R.string.time_picker_title)
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
int hour = mTimePicker.getCurrentHour();
int minute = mTimePicker.getCurrentMinute();
Calendar calendar = Calendar.getInstance();
calendar.setTime(time);
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
Date time = calendar.getTime();
sendResult(Activity.RESULT_OK, time);
}
})
.create();
}
private void sendResult(int resultCode, Date time) {
if (getTargetFragment() == null) {
return;
}
Intent intent = new Intent();
intent.putExtra(EXTRA_TIME, time);
getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, intent);
}
}
fragment_crime.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
style="?android:listSeparatorTextViewStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="@string/crime_title_label"/>
<EditText
android:id="@+id/crime_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:hint="@string/crime_title_hint"/>
<TextView
style="?android:listSeparatorTextViewStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="@string/crime_details_label"/>
<Button
android:id="@+id/crime_date"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"/>
<Button
android:id="@+id/crime_time"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"/>
<CheckBox
android:id="@+id/crime_solved"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="@string/crime_solved_label"/>
</LinearLayout>
dialog_time.xml
<?xml version="1.0" encoding="utf-8"?>
<TimePicker
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dialog_time_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:timePickerMode="clock">
</TimePicker>
