Develop Reference

cannot fetch values from firebase database

Main activity.java
public class activity_3 extends AppCompatActivity {
TextView question,option_1,option_2,option_3,description,winnner;
NumberProgressBar option_progress1, option_progress2,option_progress3;
int val_1;
int val_2;
int val_3;
DatabaseReference Polldata_3;
String optionOne;
String optionTwo;
String optionThree;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_3);
final String que = getIntent().getExtras().getString("que");
final String des = getIntent().getExtras().getString("des");
optionOne = getIntent().getExtras().getString("option1");
optionTwo = getIntent().getExtras().getString("option2");
optionThree = getIntent().getExtras().getString("option3");
final String id_user = getIntent().getExtras().getString("id");
val_1 = getIntent().getExtras().getInt("val1");
val_2 = getIntent().getExtras().getInt("val2");
val_2 = getIntent().getExtras().getInt("val3");
option_progress1 = (NumberProgressBar) findViewById(R.id.option1_progressbar);
option_progress2 = (NumberProgressBar) findViewById(R.id.option2_progressbar);
option_progress3 = (NumberProgressBar) findViewById(R.id.option3_progressbar);
Polldata_3 = FirebaseDatabase.getInstance().getReference("POll").child("poll_3");
final DatabaseReference answsersave = Polldata_3.child(id_user);
question = (TextView) findViewById(R.id.question_showpoll);
option_1 = (TextView) findViewById(R.id.option_1);
option_2 = (TextView) findViewById(R.id.option_2);
option_3 = (TextView) findViewById(R.id.option_3);
description = (TextView) findViewById(R.id.description_user_3);
winnner = (TextView) findViewById(R.id.winner);
option_1.setText(optionOne);
option_2.setText(optionTwo);
option_3.setText(optionThree);
question.setText(que);
description.setText(des);
option_progress1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress1.setProgress(val_1+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_1++;
answsersave.child("option_1_value").setValue(val_1);
//winnerdeclare();
}
});
option_progress2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress2.setProgress(val_2+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_2++;
answsersave.child("option_2_value").setValue(val_2);
// winnerdeclare();
}
});
option_progress3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
option_progress3.setProgress(val_3+1);
option_progress1.setEnabled(false);
option_progress2.setEnabled(false);
option_progress3.setEnabled(false);
val_3++;
// winnerdeclare();
answsersave.child("option_3_value").setValue(val_3);
}
});
}
}
ADAPTER CLASS
public class listview_3 extends AppCompatActivity {
ListView listviewpoll3;
private DatabaseReference Poll_data_3;
List<addpoll_3> addpoll_3List;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview_3);
listviewpoll3 = (ListView) findViewById(R.id.poll_listview_3);
Poll_data_3 = FirebaseDatabase.getInstance().getReference("POll").child("poll_3");
addpoll_3List = new ArrayList<>();
listviewpoll3.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View v, int position, long id) {
Intent intent = new Intent(listview_3.this, activity_3.class);
addpoll_3 poll = addpoll_3List.get(position);
final String optionone = poll.getOption_1();
final String optiontwo = poll.getOption_2();
final String optionthree = poll.getOption_3();
final String id_user = poll.getId();
final int value_1 = poll.getOption_1_value();
final int value_2 = poll.getOption_2_value();
final int value_3 = poll.getOption_3_value();
final String question = poll.getQuestion();
final String desp = poll.getDescription();
intent.putExtra("option1",optionone);
intent.putExtra("option2",optiontwo);
intent.putExtra("option3",optionthree);
intent.putExtra("id",id_user);
intent.putExtra("val1",value_1);
intent.putExtra("val2",value_2);
intent.putExtra("val3",value_3);
intent.putExtra("que",question);
intent.putExtra("descp",desp);
startActivity(intent);
}
});
}
#Override
protected void onStart() {
super.onStart();
Poll_data_3.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
addpoll_3List.clear();
for(DataSnapshot pollSnapshot: dataSnapshot.getChildren())
{
addpoll_3 poll = pollSnapshot.getValue(addpoll_3.class);
addpoll_3List.add(poll);
}
poll_list_3 adapter = new poll_list_3(listview_3.this,addpoll_3List);
listviewpoll3.setAdapter(adapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
list class
public class poll_list_3 extends ArrayAdapter<addpoll_3> {
private Activity context;
private List<addpoll_3> addpoll_3List;
public poll_list_3(Activity context, List<addpoll_3> addpoll_3List) {
super(context, R.layout.list_layout, addpoll_3List);
this.context = context;
this.addpoll_3List = addpoll_3List;
}
#NonNull
#Override
public View getView(int position, #Nullable View convertView, #NonNull ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View viewitem = inflater.inflate(R.layout.list_layout,null);
TextView textViewName = (TextView) viewitem.findViewById(R.id.tv);
TextView textViewDesp = (TextView) viewitem.findViewById(R.id.tv1);
final addpoll_3 poll1 = addpoll_3List.get(position);
textViewName.setText(poll1.getQuestion());
textViewDesp.setText(poll1.getDescription());
return viewitem;
}
}
I am making a polling app where user can create a poll which is then stored in the firebase database and retrieved into listview of the app
when the user clicks on the list view he is directed to the the activity where there are number of progressbars
i have added a ON-click listener o the progress bar, So when user clicks on the progressbar the val of that option gets incremented in the database. so when a different user vote on the same poll the value from the database is fetched and value of the current user is added displaying the winner,but problem is the value of the progressbar1 gets the value from the database but the other two keep progress bar values start from 0 every time user clicks on the other two progress bar (ie 2 and 3).
please help
addpoll_3.java
public class addpoll_3 {
String id;
String question;
String description;
String option_1;
String option_2;
String option_3;
int option_1_value;
int option_2_value;
int option_3_value;
public addpoll_3(){}
public addpoll_3(String id, String question, String description, String option_1, String option_2, String option_3, int option_1_value, int option_2_value, int option_3_value) {
this.id = id;
this.question = question;
this.description = description;
this.option_1 = option_1;
this.option_2 = option_2;
this.option_3 = option_3;
this.option_1_value = option_1_value;
this.option_2_value = option_2_value;
this.option_3_value = option_3_value;
}
public String getId() {
return id;
}
public String getQuestion() {
return question;
}
public String getDescription() {
return description;
}
public String getOption_1() {
return option_1;
}
public String getOption_2() {
return option_2;
}
public String getOption_3() {
return option_3;
}
public int getOption_1_value() {
return option_1_value;
}
public int getOption_2_value() {
return option_2_value;
}
public int getOption_3_value() {
return option_3_value;
}
}

code:
Activity_3.java
val_1 = getIntent().getExtras().getInt("val1");
val_2 = getIntent().getExtras().getInt("val2");
val_3 = getIntent().getExtras().getInt("val3");
These were changes to be made

//Read from the database
myRef.addValueEventListener(new ValueEventListener()
{
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
String value = dataSnapshot.getValue(String.class);
Log.d(TAG, "Value is: " + value);
}
#Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w(TAG, "Failed to read value.", error.toException());
}
});

Pass an object in android mvp?

recently I been reading about the mvp pattern on Internet and to be honest, it has been a little bit confusing.
I'm trying to re-write an app using the mvp pattern but I reached a point using AsyncTask where I can't figure out how to pass the Object in the Interactor back to the View.
Here'e the code:
View:
public class DetailsActivity extends BaseActivity {
private DetailsPresenter presenter;
private Pet pet;
private TextView name, description, breed, lostAt, age;
private int idList;
#Override
protected void onCreate(Bundle savedInstance) {
super.onCreate(savedInstance);
setContentView(R.layout.details_layout);
DetailsPresenter presenter = new DetailsPresenter();
Typeface font0 = Typeface.createFromAsset(getAssets(), "fonts/CaviarDreams.ttf");
Typeface font1 = Typeface.createFromAsset(getAssets(), "fonts/CaviarDreams_Bold.ttf");
TextView txtDescription = findViewById(R.id.textView8);
TextView txt1 = findViewById(R.id.textView6); //Age, Type
TextView txt2 = findViewById(R.id.textView9); //LostAt
Button btnContact = findViewById(R.id.button6);
description = findViewById(R.id.details);
menuRes = R.menu.details_menu;
name = findViewById(R.id.textView10);
breed = findViewById(R.id.breed);
lostAt = findViewById(R.id.lostAt);
age = findViewById(R.id.age);
name.setTypeface(font1);
breed.setTypeface(font0);
description.setTypeface(font0);
lostAt.setTypeface(font0);
txtDescription.setTypeface(font1);
txt2.setTypeface(font1);
txt1.setTypeface(font1);
btnContact.setTypeface(font0);
idList = getIntent().getExtras().getInt("TAG_LIST");
id = getIntent().getExtras().getInt("TAG_ID");
if(idList == 0){
txt1.setText(R.string.type);
txt2.setText(R.string.txt2);
} else{
txt1.setText(R.string.txt0);
txt2.setText(null);
}
btnContact.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), ChatFragment.class);
startActivity(intent);
}
});
// Get pet details from database on background
pet = presenter.getPet(idList, id);
}
#Override
protected void onPostCreate(#Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
if(idList == 0){
name.setText(pet.getName());
breed.setText("(" + pet.getBreed() + ")");
description.setText(pet.getDescription());
lostAt.setText(pet.getLocation());
}else{
name.setText(pet.getBreed());
description.setText(pet.getDescription());
lostAt.setText(pet.getGender());
age.setText(pet.getAge());
}
}
}
Presenter:
public class DetailsPresenter {
private DetailsInteractor interactor;
public Pet getPet(int idList, int id) {
interactor = new DetailsInteractor(idList, id);
interactor.execute();
return interactor.pet;
}
}
Interactor:
public class DetailsInteractor extends AsyncTask<String, String, Pet> {
public Pet pet;
private int idList;
private int id;
private DBAction database;
public DetailsInteractor (int idList, int id) {
this.idList = idList;
this.id = id;
database = new DBAction();
}
#Override
protected Pet doInBackground(String... strings) {
pet = database.requestItem(idList, id);
return pet;
}
I need that after getting the data from the database, it updates the View, using object Pet.
Any answers and suggestions will be welcomed, Thanks!

When You create/initialize a presenter in Activity(This is your view) you should pass the view to the presenter. Something like this.
DetailsPresenter presenter = new DetailsPresenter(View view);
View can be any object with which you can update the UI or can call the methods in the activity.
Moreover, you have to go through few more good site to learn about MVP.
http://valokafor.com/learn-android-mvp-pattern-example/ this is really nice one.

How can I restore parcelable list in android

I have this app that in an activity creates a list of players and displays them in a listview. When I create a player I use the populatePlayerList method and it works fine. But when I save the list in a parcel and try to restore it, it doesn't populate the listview. Can't figure out why this happens. Below is some code:
public class PlayerManager extends AppCompatActivity {
EditText playerName, playerNumber, playerPosition;
ArrayList<Player> players = new ArrayList<Player>();
ListView playerListView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player_manager);
playerName = (EditText) findViewById(R.id.etPlayerName);
playerNumber = (EditText) findViewById(R.id.etPlayerNumber);
playerPosition = (EditText) findViewById(R.id.etPlayerPosition);
playerListView = (ListView) findViewById(R.id.playerList);
if(savedInstanceState!=null){
players = savedInstanceState.getParcelableArrayList("savedList");
populatePlayerList();
}
final Button addPlayerBtn = (Button) findViewById(R.id.bAddPlayer);
addPlayerBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addPlayer(playerName.getText().toString(), playerNumber.getText().toString(), playerPosition.getText().toString());
populatePlayerList();
Toast.makeText(getApplicationContext(), playerName.getText().toString() + " added!", Toast.LENGTH_SHORT).show();
}
});
private void populatePlayerList(){
ArrayAdapter<Player> adapter = new PlayerListAdapter();
playerListView.setAdapter(adapter);
}
private void addPlayer(String name, String number, String position){
players.add(new Player(name, number, position));
}
private class PlayerListAdapter extends ArrayAdapter<Player> {
public PlayerListAdapter(){
super(PlayerManager.this, R.layout.player_list, players);
}
#Override
public View getView(int position, View view, ViewGroup parent){
if (view == null)
view = getLayoutInflater().inflate(R.layout.player_list, parent, false);
Player currentPlayer = players.get(position);
TextView name = (TextView) view.findViewById(R.id.playerName);
name.setText(currentPlayer.get_name());
TextView number = (TextView) view.findViewById(R.id.playerNumber);
number.setText(currentPlayer.get_number());
TextView playerPosition = (TextView) view.findViewById(R.id.playerPosition);
playerPosition.setText(currentPlayer.get_position());
return view;
}
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelableArrayList("savedList", players);
}
Here is my Player Class:
public class Player implements Parcelable{
private String name, position,number;
public Player (String name, String number, String position) {
this.name = name;
this.number = number;
this.position = position;
}
protected Player(Parcel in) {
name = in.readString();
position = in.readString();
number = in.readString();
}
public static final Parcelable.Creator<Player> CREATOR = new Parcelable.Creator<Player>() {
#Override
public Player createFromParcel(Parcel in) {
return new Player(in);
}
#Override
public Player[] newArray(int size) {
return new Player[size];
}
};
public String get_name() {
return name;
}
public String get_position() {
return position;
}
public String get_number(){
return number;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(name);
dest.writeString(position);
dest.writeString(number);
}
}
I checked the players list when i try to restore it and its empty. So i guess its never saved in outState. Any ideas why?

I fixed my problem by adding android:launchMode="singleInstance" in the PlayerManager activity in Android Manifest.xml file. And I override the onBackPressed to sent me back to a previous activity so the onDestroy method isn't called. That way I get to keep the same instance in the PlayerManager activity.

How to refresh rating in adapter using the Cursor Adapter

It's not duplicate. I saw all answers is Stack.
My problem: I have CommentActivity, where I get Cursor. In CommentCursorAdapter I get values from Database.
In adapter I have two images: Like and Dislike. When I click Like - in database rating incremented.
TextView rating should show a new rating after pressing. How to do it correctly?
CommentActivity
public class CommentActivity extends AppCompatActivity {
private String idComment;
private ListView listComments;
private CommentCursorAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_comment);
listComments = (ListView) findViewById(R.id.list_comments);
idComment = getIntent().getStringExtra(MainActivity.ID_KEY);
getCursorData();
}
private void getCursorData() {
adapter = new CommentCursorAdapter(this, new CursorLoader(App.getInstance(), idComment).loadInBackground(), 0);
listComments.setAdapter(adapter);
}
private static class CursorLoader extends SimpleCursorAdapter {
private String idComment;
public CursorLoader(Context context, String idComment) {
super(context);
this.idComment = idComment;
}
#Override
public Cursor loadInBackground() {
return App.getInstance().getDb().rawQuery(
"SELECT comment._id AS _id, comment.text AS text, user.email AS email, comment.rate FROM comment JOIN user ON comment.userId = user._id WHERE comment.postId = ? ORDER BY _id ASC", new String[]{
idComment
});
}
}
}
CommentCursorAdapter
public class CommentCursorAdapter extends CursorAdapter {
private TextView commentEmail;
private TextView commentText;
private TextView ratingText;
private ImageView imageViewLike;
private ImageView imageViewDislike;
private static final String ID = "_id";
private static final String EMAIL = "email";
private static final String TEXT = "text";
private static final String RATE = "rate";
public CommentCursorAdapter(Context context, Cursor c, int flags) {
super(context, c, 0);
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup viewGroup) {
return LayoutInflater.from(context).inflate(R.layout.adapter_comment, viewGroup, false);
}
#Override
public void bindView(View view, Context context, final Cursor cursor) {
commentEmail = (TextView) view.findViewById(R.id.comment_email);
commentText = (TextView) view.findViewById(R.id.comment_text);
ratingText = (TextView) view.findViewById(R.id.rating_text);
imageViewLike = (ImageView) view.findViewById(R.id.image_like);
imageViewDislike = (ImageView) view.findViewById(R.id.image_dislike);
imageViewLike.setTag(cursor.getString(cursor.getColumnIndexOrThrow(ID)));
imageViewDislike.setTag(cursor.getString(cursor.getColumnIndexOrThrow(ID)));
String email = cursor.getString(cursor.getColumnIndexOrThrow(EMAIL));
String text = cursor.getString(cursor.getColumnIndexOrThrow(TEXT));
String rating = cursor.getString(cursor.getColumnIndexOrThrow(RATE));
commentEmail.setText(email);
commentText.setText(text);
ratingText.setText(rating);
imageViewLike.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Log.e("like", "click");
SQLiteStatement statement = App.getInstance().getDb().compileStatement(
"UPDATE comment SET rate = rate + 1 WHERE comment._id = ?"
);
statement.bindString(1, (String) view.getTag());
try {
statement.execute();
} finally {
statement.close();
}
}
});
imageViewDislike.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Log.e("dislike", "click");
SQLiteStatement statement = App.getInstance().getDb().compileStatement(
"UPDATE comment SET rate = rate - 1 WHERE comment._id = ?"
);
statement.bindString(1, (String) view.getTag());
try {
statement.execute();
} finally {
statement.close();
}
//swapCursor(cursor);
//notifyDataSetChanged();
}
});
}
}

There are a some options you can choose from:
After updating the rating in the database, you can just reload all data using your loader.
You can migrate your database logic to using a ContentProvider. If you do it correctly, the provider can notify all loaders that their underlying data has been changed, so they are automatically reloaded.

In your CustomAdapter, you need to put this.notifyDataSetChanged(); where you are performing operation of the LIKE and COMMENT.
It's great that you have used CursorAdapter - that listens for update notifications and reloads the content automatically.
Hope it will help you.

How to get selected index or position of a listview and pass into a new actvity?

I would like to get the clicked index/position of a listview and then pass it over to a new activity. Bellow is my code of what i have done but I keep getting errors when i ran my code. Thank you in advance for the help.
MainAcitivity.Java
public static int hymnIndex;
private void setUpList() {
setListAdapter(new ArrayAdapter<HymnClass>(this, android.R.layout.simple_list_item_1, HymnArrayTitle));
listView = getListView();
//Let’s set a message shown upon tapping an item
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
hymnIndex = position;
Toast.makeText(getApplicationContext(),
((TextView) view).getText().toString(),
Toast.LENGTH_SHORT).show();
Intent selectedItem = new Intent(MainActivity.this, Content.class);
startActivity(selectedItem);
}
});
}
**Content.Java********************************
public class Content extends Activity{
private SQLiteDatabase database;
private static final String DB_NAME = "Akan_DB.db";
private static final String TABLE_NAME = "Hymn";
private static final String HYMN_ID = "_id";
private static final String HYMN_NUMBER = "Hymn_number";
private static final String TITLE = "Title";
private static final String Content = "Content";
private static final String Author = "Author";
private ArrayList<HymnClass> HymnArray;
TextView title_textview;
TextView Content_texview;
TextView author_textview;
TextView text;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.hymn_content);
setHymnTitle();
public class HymnClass {
int hymnId;
String hymnNumber;
String title;
String content;
String Author;
#Override
public String toString(){
return this.hymnNumber + " " + this.title;
}
}
private void setHymnTitle() {
String[] whereClause = {String.valueOf(MainActivity.hymnIndex)}; ///converted the int into a string because the where clause only accepts strings
HymnArray = new ArrayList<HymnClass>();
Cursor ListCursor = database.query(TABLE_NAME,
new String[]{HYMN_ID,HYMN_NUMBER,TITLE,Content,Author},
"HYMN_ID = ?",
whereClause,
null,
null,
TITLE);
ListCursor.moveToFirst();
if(!ListCursor.isAfterLast()) {
do {
HymnClass HymnData = new HymnClass();
HymnData.hymnNumber = ListCursor.getString(1);
HymnData.title = ListCursor.getString(2);
HymnData.content = ListCursor.getString(3);
HymnData.Author = ListCursor.getString(4);
HymnArray.add(HymnData);
// title_textview.setText(TITLE);
} while (ListCursor.moveToNext());
}
ListCursor.close();
}
}

//Let’s set a message shown upon tapping an item
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
Intent selectedItem = new Intent(MainActivity.this, Content.class);
selectedItem.putExtart("MySelectedPOS",position);
startActivity(selectedItem);
}
});
in your second Activity , in the create method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.hymn_content);
Bundel lBundel=getIntent().getExtrat();
if(lBundel!=null){
// get your passed value
int lSelectedPosition=lBundel.getInt("MySelectedPOS");
}
.
.
.
}