Develop Reference

how to restore RecyclerView?

I have the following situation:
I have two activities (Main Activity and ProductCard Activity)
Main Activity has a RecyclerView with items in it.
( User can add items manually. For example he add 3 items)
User click on some item and go to the ProductCard Activity
In the ProductCard Activity user click on the button (moneyOk_readylist) and go to the Main Activity
But when User do last step, RecyclerView become blank (empty).
I know that it is connected with states, but doesn't understand how.
Can anyone help me?
MainActivity
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.CardView;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private List<Person> persons;
private RecyclerView rv;
final String LOG_TAG = "myLogs";
RVAdapter adapter;
Person person;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
rv = (RecyclerView)findViewById(R.id.rv);
rv.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(this);
rv.setLayoutManager(llm);
persons = new ArrayList<>();
adapter = new RVAdapter(persons);
rv.setAdapter(adapter);
if ((savedInstanceState != null) && (savedInstanceState.getSerializable("card") != null)) {
persons.clear();
persons.addAll((List<Person>) savedInstanceState.getSerializable("card"));
adapter.notifyDataSetChanged();
Log.d(LOG_TAG, "restore card with persons" + persons);
}
adapter.setOnItemClickListener(new RVAdapter.MyClickListener() {
#Override
public void onItemClick(int position, View v) {
Toast.makeText(MainActivity.this, "push on item" + position, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(MainActivity.this, ProductCard.class);
startActivity(intent);
Log.d(LOG_TAG, "go to ProductCard class" + persons);
}
});
adapter.setOnItemLongClickListener(new RVAdapter.MyLongClickListener() {
#Override
public void onItemLongClick(int position, View v) {
Toast.makeText(MainActivity.this, "push on item long" + position, Toast.LENGTH_SHORT).show();
Log.d(LOG_TAG, "Removed " + position);
persons.remove(position);
adapter.notifyDataSetChanged();
}
});
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
person= new Person("Emma Wilson", "23 years old", R.drawable.im_beach);
persons.add(person);
Log.d(LOG_TAG, "push add" + persons);
adapter.notifyDataSetChanged();
}
});
}
#Override
protected void onResume() {
super.onResume();
adapter = new RVAdapter(persons);
rv.setAdapter(adapter);
Log.d(LOG_TAG, "onresume" + persons);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable("card", (Serializable) persons);
Log.d(LOG_TAG, "save cards" + persons);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
ProductCard Activity
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
/**
* Created by Dmitry on 01.11.2015.
*/
public class ProductCard extends AppCompatActivity implements AdapterView.OnItemClickListener {
final String LOG_TAG = "myLogs";
Button moneyOk_readylist;
ImageButton addPhoto;
ImageView imageView;
private static int LOAD_IMAGE_RESULTS = 1;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_card);
moneyOk_readylist=(Button)findViewById(R.id.moneyOk_readylist);
addPhoto=(ImageButton)findViewById(R.id.add_photo);
imageView=(ImageView)findViewById(R.id.imageView);
addPhoto.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
return false;
}
});
addPhoto.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
i.setType("image/*");
//i.setAction(Intent.ACTION_PICK);
startActivityForResult(Intent.createChooser(i,"Select picture"),1);
}
});
moneyOk_readylist.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent=new Intent(ProductCard.this,MainActivity.class);
startActivity(intent);
}
});
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Here we need to check if the activity that was triggers was the Image Gallery.
// If it is the requestCode will match the LOAD_IMAGE_RESULTS value.
// If the resultCode is RESULT_OK and there is some data we know that an image was picked.
if (requestCode == 1 && resultCode == RESULT_OK && data != null) {
// Let's read picked image data - its URI
imageView.setImageURI(data.getData());
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case R.id.action_save_card:
Toast.makeText(ProductCard.this, "Карточка сохранена", Toast.LENGTH_SHORT).show();
Intent intent=new Intent(ProductCard.this,MainActivity.class);
startActivity(intent);
Log.d(LOG_TAG, "go to Main class" );
break;
case R.id.action_delete_card:
Toast.makeText(ProductCard.this, "Карточка удалена", Toast.LENGTH_SHORT).show();
break;
}
return true;
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
}

Two activities sending data to each other

Two activities are sending data to each other.
The first activity has a custom list view. The second has one text view and three buttons to increase and decrease a value.
When I click on the first activity, the second activity opens. The second activity increases the text view value and clicked the button. Data goes to the first activity. Same process again.
My problem is that the total value is not displayed in the first activity.
How can i show all increase and decrease values from the second activity in the first activity?
First activity's code:
package com.firstchoicefood.phpexpertgroup.firstchoicefoodin;
import android.app.ActionBar;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import com.firstchoicefood.phpexpertgroup.firstchoicefoodin.bean.ListModel;
import com.firstchoicefood.phpexpertgroup.firstchoicefoodin.json.JSONfunctions;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
public class DetaisRESTActivity extends Activity {
String messagevaluename,valueid,valueid1,valuename,pos;
public String countString=null;
String nameofsubmenu;
public int count=0;
public String message=null;
public String message1=null;
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ArrayList aa;
public SharedPreferences.Editor edit;
public TextView mTitleTextView;
public ImageButton imageButton;
ListAdapterAddItems adapter;
public TextView restaurantname = null;
public TextView ruppees = null;
ProgressDialog mProgressDialog;
ArrayList<ListModel> arraylist;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detais_rest);
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#ff0000")));
SharedPreferences preferences=getSharedPreferences("temp1", 1);
// SharedPreferences.Editor editor = preferences.edit();
int na=preferences.getInt("COUNTSTRING1",0);
Log.i("asasassas",""+na);
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.titlebar, null);
mTitleTextView = (TextView) mCustomView.findViewById(R.id.textView123456789);
imageButton = (ImageButton) mCustomView
.findViewById(R.id.imageButton2);
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), "Refresh Clicked!",
Toast.LENGTH_LONG).show();
Intent i=new Intent(DetaisRESTActivity.this,TotalPriceActivity.class);
startActivity(i);
}
});
actionBar.setCustomView(mCustomView);
actionBar.setDisplayShowCustomEnabled(true);
// SqliteControllerSqliteController db = new SqliteControllerSqliteController(QuentityActivity.this);
// Reading all contacts
/*
Log.d("Reading: ", "Reading all contacts..");
List<Contact> contacts = db.getAllContacts();
for (Contact cn : contacts) {
String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() + " ,Phone: " +
cn.getPhoneNumber();
// Writing Contacts to log
Log.d("Name: ", log);
}
*/
Intent intent = getIntent();
// get the extra value
valuename = intent.getStringExtra("restaurantmenuname");
valueid = intent.getStringExtra("restaurantmenunameid");
valueid1 = intent.getStringExtra("idsrestaurantMenuId5");
//totalamount = intent.getStringExtra("ruppees");
Log.i("valueid",valueid);
Log.i("valuename",valuename);
Log.i("valueid1",valueid1);
// Log.i("totalamount",totalamount);
new DownloadJSON().execute();
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void,Void,Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(DetaisRESTActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("Android JSON Parse Tutorial");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
Toast.makeText(DetaisRESTActivity.this, "Successs", Toast.LENGTH_LONG).show();
}
#Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<ListModel>();
// Retrieve JSON Objects from the given URL address
// Log.i("123",value1);
jsonobject = JSONfunctions.getJSONfromURL("http://firstchoicefood.in/fcfapiphpexpert/phpexpert_restaurantMenuItem.php?r=" + URLEncoder.encode(valuename) + "&resid=" + URLEncoder.encode(valueid1) + "&RestaurantCategoryID=" + URLEncoder.encode(valueid) + "");
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("RestaurantMenItems");
Log.i("1234",""+jsonarray);
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
ListModel sched = new ListModel();
sched.setId(jsonobject.getString("id"));
sched.setProductName(jsonobject.getString("RestaurantPizzaItemName"));
sched.setPrice(jsonobject.getString("RestaurantPizzaItemPrice"));
arraylist.add(sched);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listViewdetails);
adapter = new ListAdapterAddItems();
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
adapter.notifyDataSetChanged();
listview.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3)
{
// Get Person "behind" the clicked item
ListModel p =(ListModel)listview.getItemAtPosition(position);
// Log the fields to check if we got the info we want
Log.i("SomeTag",""+p.getId());
//String itemvalue=(String)listview.getItemAtPosition(position);
Log.i("SomeTag", "Persons name: " + p.getProductName());
Log.i("SomeTag", "Ruppees: " + p.getPrice());
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
Log.i("postititi",""+position);
Intent intent=new Intent(DetaisRESTActivity.this,QuentityActivity.class);
intent.putExtra("quentity",countString);
intent.putExtra("valueid",valueid);
intent.putExtra("valuename",valuename);
intent.putExtra("valueid1",valueid1);
intent.putExtra("id",p.getId());
intent.putExtra("name",p.getProductName());
intent.putExtra("price",p.getPrice());
startActivityForResult(intent,2);
// startActivity(intent);
}
});
}
}
// Call Back method to get the Message form other Activity
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// check if the request code is same as what is passed here it is 2
if(requestCode==2)
{
pos=data.getStringExtra("POSITION");
message=data.getStringExtra("MESSAGE");
message1=data.getStringExtra("COUNTSTRING");
messagevaluename=data.getStringExtra("VALUENAME");
nameofsubmenu=data.getStringExtra("name");
Log.i("xxxxxxxxxxx",message);
Log.i("xxxxxxxxxxx1234",pos);
Log.i("xxxxxxxxxxx5678count",message1);
Log.i("messagevaluename",messagevaluename);
Log.i("submenu",nameofsubmenu);
//ruppees.setText(message);
//editor.putInt("count",na);
//editor.commit();
//Log.i("asasassasasdsasdasd",""+na);
// mTitleTextView.setText(Arrays.toString(message1));
mTitleTextView.setText(message1);
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(getApplicationContext(), message,
Toast.LENGTH_LONG).show();
Intent i=new Intent(DetaisRESTActivity.this,TotalPriceActivity.class);
i.putExtra("count",message1);
i.putExtra("submenu",nameofsubmenu);
i.putExtra("ruppees",message);
i.putExtra("id",pos);
i.putExtra("messagevaluename",messagevaluename);
startActivity(i);
}
});
}
}
//==========================
class ListAdapterAddItems extends ArrayAdapter<ListModel>
{
ListAdapterAddItems(){
super(DetaisRESTActivity.this,android.R.layout.simple_list_item_1,arraylist);
//imageLoader = new ImageLoader(MainActivity.this);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if(convertView == null){
LayoutInflater inflater = getLayoutInflater();
convertView = inflater.inflate(R.layout.cartlistitem, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
holder.populateFrom(arraylist.get(position));
// arraylist.get(position).getPrice();
return convertView;
}
}
class ViewHolder {
ViewHolder(View row) {
restaurantname = (TextView) row.findViewById(R.id.rastaurantnamedetailsrestaurant);
ruppees = (TextView) row.findViewById(R.id.rastaurantcuisinedetalsrestaurant);
}
// Notice we have to change our populateFrom() to take an argument of type "Person"
void populateFrom(ListModel r) {
restaurantname.setText(r.getProductName());
ruppees.setText(r.getPrice());
}
}
//=============================================================
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_detais_rest, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
return super.onOptionsItemSelected(item);
}
public void OnPause(){
super.onPause();
}
}
Second activity's code:
package com.firstchoicefood.phpexpertgroup.firstchoicefoodin;
import android.app.ActionBar;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.firstchoicefood.phpexpertgroup.firstchoicefoodin.bean.CARTBean;
import com.firstchoicefood.phpexpertgroup.firstchoicefoodin.bean.ListModel;
import com.firstchoicefood.phpexpertgroup.firstchoicefoodin.database.SqliteController;
public class QuentityActivity extends Activity {
String value=null;
public String TotAmt=null;
String[] cccc;
ImageButton positive,negative;
String position;
static int count = 1;
int tot_amt = 0;
public String countString=null;
String name,price;
String valueid,valueid1,valuename;
public TextView ruppees,submenuname,totalruppees,quantity,addtocart;
SharedPreferences preferences;
SharedPreferences.Editor editor;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quentity);
ActionBar actionBar = getActionBar();
// Enabling Up / Back navigation
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#ff0000")));
preferences = getSharedPreferences("temp1",1);
editor = preferences.edit();
Intent intent = getIntent();
// get the extra value
value = intent.getStringExtra("quentity");
valuename = intent.getStringExtra("valuename");
valueid = intent.getStringExtra("valueid");
valueid1 = intent.getStringExtra("valueid1");
name=intent.getStringExtra("name");
price=intent.getStringExtra("price");
position=intent.getStringExtra("id");
quantity=(TextView)findViewById(R.id.rastaurantcuisinedetalsrestaurantquantity);
totalruppees=(TextView)findViewById(R.id.rastaurantnamequentitytotal1);
submenuname=(TextView)findViewById(R.id.rastaurantnamesubmenuquentity);
ruppees=(TextView)findViewById(R.id.rastaurantnamequentity1);
positive=(ImageButton)findViewById(R.id.imageButtonpositive);
negative=(ImageButton)findViewById(R.id.imageButtonnegative);
addtocart=(TextView)findViewById(R.id.textViewaddtocart);
buttonclick();
addtocart();
submenuname.setText(name);
ruppees.setText(price);
totalruppees.setText(price);
// new DownloadJSON().execute();
}
public void buttonclick(){
positive.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String totalAmtString = ruppees.getText().toString();
int totAmount = Integer.parseInt(totalAmtString);
//count = Integer.parseInt(getString);
count++;
editor.putInt("COUNTSTRING1", count);
editor.commit();
editor.clear();
Log.i("sunder sharma",""+count);
countString= String.valueOf(count);
tot_amt = totAmount * count;
TotAmt = String.valueOf(tot_amt);
totalruppees.setText(TotAmt);
quantity.setText(countString);
}
});
negative.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String totalAmtString = ruppees.getText().toString();
int totAmount = Integer.parseInt(totalAmtString);
if (count > 1)
count--;
editor.putInt("COUNTSTRING1", count);
editor.commit();
countString = String.valueOf(count);
tot_amt = totAmount * count;
TotAmt = String.valueOf(tot_amt);
totalruppees.setText(TotAmt);
quantity.setText(countString);
}
});
}
public void addtocart(){
addtocart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/* Log.i("valueid",valueid);
Log.i("valuename",valuename);
Log.i("valueid1",valueid1);
Log.i("name",name);
Log.i("price",price);
Log.i("id1",position);
SqliteController db = new SqliteController(QuentityActivity.this);
db.insertStudent(new CARTBean(position,name,price,countString,TotAmt));
*/
Intent intent=new Intent();
intent.putExtra("MESSAGE",TotAmt);
intent.putExtra("POSITION",position);
intent.putExtra("COUNTSTRING",countString);
intent.putExtra("VALUENAME",valuename);
intent.putExtra("name",name);
setResult(2,intent);
finish();//finishing activity
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_quentity, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Collect the data from second activity and put into below intent .Then you will receive first activity.
Intent myIntent = new Intent(secondActivity.this, firstActivity.class);
myIntent.putExtra("COUNTSTRING", CountString); //add data
startActivity(myIntent);

Get variables from one activity to another

I work simple android app for sending sms. I have 2 activities. One is main for sending 2 different messages with 2 different content but messages send to same number. On secund activity i have 3 fields: one is for input number to send messages, and other two are for message content. When I click save button app save user input and go back to main activity. And here start my problem. How can i send users input for number to send messages and messages content to main activity to send sms with saved user input? I am totally beginner with android developing so please help! Here is my MainActivity.java:
package com.example.davor.light;
import android.content.Intent; import
android.support.v7.app.ActionBarActivity; import android.os.Bundle;
import android.telephony.SmsManager; import
android.telephony.SmsMessage; import android.view.Menu; import
android.view.MenuItem; import android.view.View; import
android.widget.Button; import android.widget.ImageView; import
android.widget.TextView; import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// GUMBI INFORMACIJE
Button ukljuci = (Button) findViewById(R.id.ukljuci);
Button iskljuci = (Button) findViewById(R.id.iskljuci);
Button postavke = (Button) findViewById(R.id.postavke);
final ImageView slika = (ImageView) findViewById(R.id.slika);
// INFORMACIJA O PORUCI
final String broj = "097";
final String ukljuciPoruka = "Uključi";
final String iskljuciPoruka = "Isključi";
// KLIK NA GUMB ISKLJUČI
iskljuci.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(broj, null, iskljuciPoruka, null, null);
Toast.makeText(getApplicationContext(), "Isključeno! poslano na broj " + broj, Toast.LENGTH_LONG).show();
slika.setImageResource(R.drawable.off);
} catch (Exception e) {
Toast.makeText(getApplicationContext(),"Nemoguće isključiti!",Toast.LENGTH_LONG).show();
}
}
});
postavke.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent PostavkeActivity = new Intent(MainActivity.this,
Postavke.class);
startActivity(PostavkeActivity);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
} }
And here is code for my second activity from witch I want to pull users input to MainActivity:
package com.example.davor.light;
import android.app.Activity; import android.content.Intent; import
android.content.SharedPreferences; import
android.preference.PreferenceManager; import
android.support.v7.app.ActionBarActivity; import android.os.Bundle;
import android.view.Menu; import android.view.MenuItem; import
android.view.View; import android.widget.Button; import
android.widget.EditText; import android.widget.TextView; import
android.widget.Toast;
public class Postavke extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_postavke);
gumbZaPovratak();
SharedPreferences loadSettings = PreferenceManager.getDefaultSharedPreferences(this);
String ucitajBroj = loadSettings.getString("spremiBroj", "");
String ucitajUkljuci = loadSettings.getString("spremiUkljuci", "");
String ucitajIskljuci = loadSettings.getString("spremiIskljuci", "");
final EditText postavkeBroj = (EditText) findViewById(R.id.postavkeBroj);
postavkeBroj.setText(ucitajBroj);
final EditText postavkeUkljuci = (EditText) findViewById(R.id.postavkeUkljuci);
postavkeUkljuci.setText(ucitajUkljuci);
final EditText postavkeIskljuci = (EditText) findViewById(R.id.postavkeIskljuci);
postavkeIskljuci.setText(ucitajIskljuci);
Button spremi = (Button) findViewById(R.id.postavkeSpremi);
spremi.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v){
spremiPostavke("spremiBroj", postavkeBroj.getText().toString());
spremiPostavke("spremiUkljuci", postavkeUkljuci.getText().toString());
spremiPostavke("spremiIskljuci", postavkeIskljuci.getText().toString());
Toast.makeText(getApplicationContext(), "Spremljeno", Toast.LENGTH_LONG).show();
finish();
}
});
}
private void postavkeBroj() {
EditText postavkeBroj = (EditText) findViewById(R.id.postavkeBroj);
}
private void spremiPostavke (String ključ, String vrijednost) {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(ključ, vrijednost);
editor.commit();
}
private void gumbZaPovratak(){
Button nazad = (Button) findViewById(R.id.nazad);
nazad.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_postavke, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
} }

You can use startActivityForResult()
You can refer this link:
http://hmkcode.com/android-startactivityforresult/

In Activity1
Intent myIntent = new Intent(this,Activity2.class);
myIntent.putExtra("var", variable_to_pass);
startActivity(myIntent);
In Activity2
Bundle extras = getIntent().getExtras();
if (extras != null) {
intentExtra = extras.getString("var"); // retrieving variable
}

You can add data to an intent like this :
String messageContent = (EditText) findViewById(yourMessageContentId).getText().toString();
String messageNumber = (EditText) findViewById(yourMessageNumberId).getText().toString();
intent.putExtra("com.example.davor.light.MESSAGE_CONTENT", messageContent);
intent.putExtra("com.example.davor.light.MESSAGE_NUMBER", messageNumber);
And then get it on the MainActivity :
Intent intent = getIntent();
String messageNumber = intent.getStringExtra("com.example.davor.light.MESSAGE_NUMBER");
String messageContent = intent.getStringExtra("com.example.davor.light.MESSAGE_CONTENT");

you can send information from one activity to other activity like bellow
Intent postavkeActivity = new Intent(MainActivity.this,
Postavke.class);
Bundle bundle=new Bundle();
bundle.putString(|"messageKey1", "message content1");
bundle.putString(|"messageKey2", "message content2");
postavkeActivity.putExtras(bundle);
startActivity(PostavkeActivity);
in main activity get bundle data like bellow
Bundle b=getIntent.getExtras();
String smsContent=b.getString("messageKey1");

I can't make a button appear (possibly issue with static referencing)

I want to make a button appear in the MenuActivity layout but the deciding if statement is in the CapitalReceiver class. I've tried adding 'static' to various variables but it didn't work. Please help!
import android.support.v4.app.Fragment;
import android.support.v4.content.LocalBroadcastManager;
import android.text.format.DateFormat;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;
public class MenuActivity extends Activity {
String status;
Boolean verified = false;
String textColour = "#000000";
TextView mTvCapital;
ArrayAdapter<String> mAdapter;
Intent mServiceIntent;
CapitalReceiver mReceiver;
IntentFilter mFilter;
String country = "7ec47294ff3d8b74";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu_layout);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
Button IDButton = (Button) findViewById(R.id.getIt);
Button RefreshButton = (Button) findViewById(R.id.refresh);
long updateTimeMillis = System.currentTimeMillis();
String updateTime = (String) DateFormat.format("hh:mm", updateTimeMillis);
//If application has been submitted//
if(preferences.contains("first_middle_store") & !(verified)) {
status = "Status: Application pending. Last updated: " + updateTime;
IDButton.setVisibility(View.GONE);
RefreshButton.setVisibility(View.VISIBLE);
textColour = "#000000";
}
//If application has not been submitted
else {
status = "Status: Application not yet submitted";
IDButton.setVisibility(View.GONE);
RefreshButton.setVisibility(View.GONE);
textColour = "#000000";
}
TextView text=(TextView)findViewById(R.id.application_status);
text.setTextColor(Color.parseColor(textColour));
text.setText(status);
Button btnNextScreen = (Button) findViewById(R.id.verify);
//Listening to verify event
btnNextScreen.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent nextScreen = new Intent(getApplicationContext(), VerifyActivity.class);
startActivity(nextScreen);
}
});
Button btnNextScreen2 = (Button) findViewById(R.id.how);
//Listening to HowItWorks event
btnNextScreen2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent nextScreen2 = new Intent(getApplicationContext(), HowItWorksActivity.class);
startActivity(nextScreen2);
}
});
//Listening to IDbutton event
IDButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent nextScreen3 = new Intent(getApplicationContext(), IDActivity.class);
startActivity(nextScreen3);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.menu_layout, container, false);
return rootView;
}
}
public void refresh(View view) {
// Getting reference to TextView
mTvCapital = (TextView) findViewById(R.id.tv_capital);
mTvCapital.setText("hello");
// Creating an intent service
mServiceIntent = new Intent(getApplicationContext(), CapitalService.class);
mServiceIntent.putExtra(Constants.EXTRA_ANDROID_ID, country);
// Starting the CapitalService to fetch the capital of the country
startService(mServiceIntent);
// Instantiating BroadcastReceiver
mReceiver = new CapitalReceiver();
// Creating an IntentFilter with action
mFilter = new IntentFilter(Constants.BROADCAST_ACTION);
// Registering BroadcastReceiver with this activity for the intent filter
LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(mReceiver, mFilter);
}
// Defining a BroadcastReceiver
private static class CapitalReceiver extends BroadcastReceiver{
#Override
public void onReceive(Context context, Intent intent) {
String capital = intent.getStringExtra(Constants.EXTRA_APPROVAL);
if(capital == "YES") {
//status = "Status: Application Approved";//
//IDButton.setVisibility(View.VISIBLE);//
}
else if(capital == "NO"){
//status = "Status: Application Denied";//
}
}
}
}

Just glancing over your code, a possible solution (and perhaps not the best) would be to make the ID Button variable global. You would then instantiate it in the onCreate whilst still allowing it to be manipulated in other classes in this MenuActivity.
I hope this helps.

parse object not receiving

I get the Id for a parse object from a previous activity and store it in "obj"
I know the Id is being passed by checking but am getting null pointer exceptions because my four strings restName,restAddress,restCuisine and restLocation are empty even after i try assigning the corresponding values by my parse query.
package com.example.gastronomaapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.parse.GetCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
public class SingleRestraunt extends ActionBarActivity {
private GoogleMap map;
TextView resteName, resteCuisine, resteLocation, resteAddress;
String restName = "nothing", obj, restCuisine = "nothing",
restLocation = "nothing", restAddress = "nothing";
Double Lang, Long;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_restraunt);
Intent i = getIntent();
obj = i.getStringExtra("restName");
getDetails(obj);
}
private void getDetails(String obj) {
ParseQuery<ParseObject> query = ParseQuery.getQuery("Restraunt");
query.getInBackground(obj, new GetCallback<ParseObject>() {
#Override
public void done(ParseObject object, ParseException e) {
if (e == null) {
restName = object.getString("Name");
restCuisine = object.getString("Cuisine");
restLocation = object.getString("Location");
restAddress = object.getString("Address");
Lang = object.getDouble("Lat");
Long = object.getDouble("Long");
} else {
e.printStackTrace();
}
}
});
// prepareMap(Lang, Long);
addData();
}
public void addData() {
resteName = (TextView) findViewById(R.id.restrauntName);
resteCuisine = (TextView) findViewById(R.id.restrauntCuisine);
resteLocation = (TextView) findViewById(R.id.restrauntLocation);
resteAddress = (TextView) findViewById(R.id.restrauntAddress);
resteName.setText(restName);
resteCuisine.setText(restCuisine);
resteLocation.setText(restLocation);
resteAddress.setText(restAddress);
}
public void prepareMap(Double Lang, Double Long) {
final LatLng REST = new LatLng(Lang, Long);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
#SuppressWarnings("unused")
Marker hamburg = map.addMarker(new MarkerOptions().position(REST)
.title("Here"));
map.moveCamera(CameraUpdateFactory.newLatLngZoom(REST, 15));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.single_restraunt, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void Submit(View v) {
final EditText edit = (EditText) findViewById(R.id.review);
final EditText edit1 = (EditText) findViewById(R.id.rName);
String rName = edit1.getText().toString();
String review = edit.getText().toString();
ParseObject newReview = new ParseObject("Reviews");
newReview.put("Name", rName);
newReview.put("review", review);
newReview.saveInBackground();
}
}
I added the nothing value to all my strings initially to debug. And when running promptly the nothing is printed indicating that the query is not making any change to my strings.Any suggestions?