@Database(entities = {Note.class}, version = 1, exportSchema = true)
public abstract class AppDatabase extends RoomDatabase {
private static AppDatabase appDatabase;
public abstract NoteDao noteDao();
public static AppDatabase getInstance(Context context){
if (appDatabase==null){
appDatabase= Room.databaseBuilder(context,AppDatabase.class,"db_7learn").allowMainThreadQueries().build();
}
return appDatabase;
}
}
public class AppSetting {
private SharedPreferences sharedPreferences;
private static final String KEY_FIRST_NAME = "first_name";
private static final String KEY_LAST_NAME = "last_name";
private static final String KEY_AGE = "age";
private static final String KEY_RATE = "rate";
public AppSetting(Context context) {
sharedPreferences = context.getSharedPreferences("setting", Context.MODE_PRIVATE);
}
public void saveUserInfo(String firstName, String lastName, int age, float rate) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(KEY_FIRST_NAME, firstName);
editor.putString(KEY_LAST_NAME, lastName);
editor.putInt(KEY_AGE, age);
editor.putFloat(KEY_RATE, rate);
editor.apply();
}
public String getFirstName() {
return sharedPreferences.getString(KEY_FIRST_NAME, "");
}
public String getLastName() {
return sharedPreferences.getString(KEY_LAST_NAME, "");
}
public int getAge() {
return sharedPreferences.getInt(KEY_AGE, 0);
}
public float getRate() {
return sharedPreferences.getFloat(KEY_RATE, 0);
}
}
public class EditNoteDialog extends DialogFragment {
private OnNoteEdit onNoteEdit;
private Note note;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null)
note = getArguments().getParcelable("note");
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnNoteEdit) {
onNoteEdit = (OnNoteEdit) context;
}
}
@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_edit_note, null);
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setView(view);
final EditText titleEt = view.findViewById(R.id.et_editNote_title);
final EditText descEt = view.findViewById(R.id.et_editNote_desc);
if (note != null) {
titleEt.setText(note.getTitle());
descEt.setText(note.getDescripion());
}
Button saveNoteBtn = view.findViewById(R.id.btn_editNote_save);
saveNoteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (titleEt.length() > 0 && descEt.length() > 0) {
if (note != null) {
note.setTitle(titleEt.getText().toString());
note.setDescripion(descEt.getText().toString());
onNoteEdit.onEdit(note);
} else {
Note note = new Note();
note.setTitle(titleEt.getText().toString());
note.setDescripion(descEt.getText().toString());
onNoteEdit.onEdit(note);
}
dismiss();
}
}
});
return builder.create();
}
public static EditNoteDialog newInstance(Note note) {
Bundle args = new Bundle();
args.putParcelable("note", note);
EditNoteDialog fragment = new EditNoteDialog();
fragment.setArguments(args);
return fragment;
}
public interface OnNoteEdit {
void onEdit(Note note);
}
}
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_main_sharedPref:
startActivity(new Intent(MainActivity.this, PersonalInfoActivity.class));
break;
case R.id.btn_main_room:
startActivity(new Intent(MainActivity.this, NotesActivity.class));
break;
}
}
}
public class NoteAdapter extends RecyclerView.Adapter<NoteAdapter.NoteViewHolder> {
private NoteUiCallback noteUiCallback;
private List<Note> notes = new ArrayList<>();
public NoteAdapter(NoteUiCallback noteUiCallback) {
this.noteUiCallback = noteUiCallback;
}
public void addNotes(List<Note> notes) {
this.notes.addAll(notes);
notifyDataSetChanged();
}
public void addNote(Note note) {
this.notes.add(0, note);
notifyItemInserted(0);
}
public void clear(){
this.notes.clear();
notifyDataSetChanged();
}
public void updateNote(Note note) {
for (int i = 0; i < notes.size(); i++) {
if (notes.get(i).getId() == note.getId()) {
notes.set(i, note);
notifyItemChanged(i);
return;
}
}
}
@NonNull
@Override
public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
return new NoteViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_note, viewGroup, false));
}
@Override
public void onBindViewHolder(@NonNull NoteViewHolder noteViewHolder, int i) {
noteViewHolder.bindNote(notes.get(i));
}
@Override
public int getItemCount() {
return notes.size();
}
public class NoteViewHolder extends RecyclerView.ViewHolder {
private TextView titleTv;
private TextView descTv;
private Button deleteButton;
private Button editButton;
public NoteViewHolder(@NonNull View itemView) {
super(itemView);
titleTv = itemView.findViewById(R.id.tv_note_title);
descTv = itemView.findViewById(R.id.tv_note_desc);
deleteButton = itemView.findViewById(R.id.btn_note_delete);
editButton = itemView.findViewById(R.id.btn_note_edit);
}
public void bindNote(final Note note) {
titleTv.setText(note.getTitle());
descTv.setText(note.getDescripion());
deleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
noteUiCallback.onDeleteBtnClick(note, getAdapterPosition());
}
});
editButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
noteUiCallback.onEditBtnClick(note, getAdapterPosition());
}
});
}
}
public void deleteNote(int position) {
notes.remove(position);
notifyItemRemoved(position);
}
public interface NoteUiCallback {
void onDeleteBtnClick(Note note, int position);
void onEditBtnClick(Note note, int position);
}
}
public class NotesActivity extends AppCompatActivity implements EditNoteDialog.OnNoteEdit, NoteAdapter.NoteUiCallback {
private NoteDao noteDao;
private NoteAdapter noteAdapter;
private boolean isInEditMode = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notes);
AppDatabase appDatabase = AppDatabase.getInstance(this);
noteDao = appDatabase.noteDao();
List<Note> notes = noteDao.getAll();
RecyclerView recyclerView = findViewById(R.id.rv_notes);
recyclerView.setLayoutManager(new LinearLayoutManager(
this, LinearLayoutManager.VERTICAL, false
));
noteAdapter = new NoteAdapter(this);
recyclerView.setAdapter(noteAdapter);
noteAdapter.addNotes(notes);
Button addNoteBtn = findViewById(R.id.btn_notes_addNewNote);
addNoteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isInEditMode = false;
EditNoteDialog dialog = new EditNoteDialog();
dialog.show(getSupportFragmentManager(), null);
}
});
Button deleteBtn = findViewById(R.id.btn_notes_deleteAll);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
noteDao.deleteAll();
noteAdapter.clear();
}
});
}
@Override
public void onEdit(Note note) {
if (isInEditMode) {
noteDao.update(note);
noteAdapter.updateNote(note);
} else {
noteDao.save(note);
noteAdapter.addNote(note);
}
}
@Override
public void onDeleteBtnClick(Note note, int position) {
noteDao.delete(note);
noteAdapter.deleteNote(position);
}
@Override
public void onEditBtnClick(Note note, int position) {
isInEditMode = true;
EditNoteDialog editNoteDialog = EditNoteDialog.newInstance(note);
editNoteDialog.show(getSupportFragmentManager(), null);
}
}
public class PersonalInfoActivity extends AppCompatActivity {
private AppSetting setting;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_personal_info);
setting = new AppSetting(this);
final EditText firstNameEt = findViewById(R.id.et_main_firstName);
final EditText lastNameEt = findViewById(R.id.et_main_lastName);
final EditText ageEt = findViewById(R.id.et_main_age);
final EditText rateEt = findViewById(R.id.et_main_rate);
Button saveBtn = findViewById(R.id.btn_main_save);
saveBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setting.saveUserInfo(firstNameEt.getText().toString(),
lastNameEt.getText().toString(),
Integer.parseInt(ageEt.getText().toString()),
Float.parseFloat(rateEt.getText().toString()));
}
});
firstNameEt.setText(setting.getFirstName());
lastNameEt.setText(setting.getLastName());
ageEt.setText(String.valueOf(setting.getAge()));
rateEt.setText(String.valueOf(setting.getRate()));
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/btn_main_sharedPref"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Shared Pref"
android:onClick="onClick" />
<Button
android:id="@+id/btn_main_room"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Room"
android:onClick="onClick" />
<Button
android:id="@+id/btn_main_broadcastReceiver"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Broadcast Receiver"
android:onClick="onClick" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".notes.NotesActivity">
<Button
android:id="@+id/btn_notes_addNewNote"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Add new note" />
<Button
android:id="@+id/btn_notes_deleteAll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@id/btn_notes_addNewNote"
android:text="Delete All" />
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_notes"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/btn_notes_deleteAll">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".sharedpref.PersonalInfoActivity">
<EditText
android:id="@+id/et_main_firstName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="First Name" />
<EditText
android:id="@+id/et_main_lastName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Last Name" />
<EditText
android:id="@+id/et_main_age"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Age" />
<EditText
android:id="@+id/et_main_rate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Rate" />
<Button
android:id="@+id/btn_main_save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Save" />
</LinearLayout>
def room_version = "1.1.1"
implementation "android.arch.persistence.room:runtime:$room_version"
annotationProcessor "android.arch.persistence.room:compiler:$room_version"
implementation 'com.android.support:recyclerview-v7:28.0.0'
<?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">
<EditText
android:id="@+id/et_editNote_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter title"/>
<EditText
android:id="@+id/et_editNote_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter description"/>
<Button
android:id="@+id/btn_editNote_save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Save"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_note_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black" />
<TextView
android:id="@+id/tv_note_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btn_note_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Edit"/>
<Button
android:id="@+id/btn_note_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete"/>
</LinearLayout>
</LinearLayout>