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Android studio onItemClick displaying grey

I have a project, controlling a jetski from a far with a android application using Bluetooth.
I have made 2 files:
Here is the "Peripherique.java" (the Bluetooth thing):
package com.example.btjetski;
import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Set;
public class Peripherique extends AppCompatActivity {
Button btnPaired;
ListView devicelist;
private BluetoothAdapter myBluetooth;
private Set<BluetoothDevice> pairedDevices;
public static String EXTRA_ADDRESS = "device_address";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnPaired = findViewById(R.id.button);
devicelist = findViewById(R.id.listView);
myBluetooth = BluetoothAdapter.getDefaultAdapter();
if (myBluetooth == null) {
Toast.makeText(getApplicationContext(), "Périphérique Bluetooth non disponible", Toast.LENGTH_LONG).show();
finish();
} else if (!myBluetooth.isEnabled()) {
Intent turnBTon = new
Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnBTon, 1);
}
btnPaired.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
list();
}
});
}
private void list() { // écouter les périphériques BT
pairedDevices = myBluetooth.getBondedDevices();
ArrayList list = new ArrayList();
if (pairedDevices.size() > 0) {
for (BluetoothDevice bt : pairedDevices) {
list.add(bt.getName() + "\n" + bt.getAddress());
}
} else {
Toast.makeText(getApplicationContext(), "Aucun des appareils trouvés", Toast.LENGTH_LONG).show();
}
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, list);
devicelist.setAdapter(adapter);
}
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3)
{
String info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17);
Intent i = new Intent(Peripherique.this, jetControl.class);
i.putExtra(EXTRA_ADDRESS, address);
startActivity(i);
}
}
Here is jetControl.java
package com.example.btjetski;
import android.app.ProgressDialog;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import java.io.IOException;
import java.util.UUID;
public class jetControl extends AppCompatActivity {
Button buttonON1, buttonOFF1;
String address = null;
private ProgressDialog progress;
BluetoothAdapter myBluetooth = null;
BluetoothSocket btSocket = null;
private boolean isBtConnected = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent newint = getIntent();
address = newint.getStringExtra(Peripherique.EXTRA_ADDRESS); //recevoir l'adresse du périphérique BT
setContentView(R.layout.activity_jet_control);
//WIDGETS
Button buttonON1 = findViewById(R.id.buttonON1);
Button buttonOFF1 = findViewById(R.id.buttonOFF1);
setOnClickListener();
}
private void setOnClickListener() {
buttonON1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AllumerJetski1();
}
});
buttonOFF1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EteindreJetski1();
}
});
}
private void AllumerJetski1() {
if (btSocket != null) {
try {
btSocket.getOutputStream().write("A".toString().getBytes());
} catch (IOException e) {
}
}
}
private void EteindreJetski1() {
if (btSocket != null) {
try {
btSocket.getOutputStream().write("a".toString().getBytes());
} catch (IOException e) {
}
}
}
}
When the app starts, i can connect to my ESP32 but nothing happens, i should have an overlay that shows up with two buttons "ON/OFF" but nothing seems to work properly.
I thank you so much for your help.

android studio com.android.volley.clienterror

its giving me a error that is called com.android.volley.clienterror
whenever i press the register or login button. I imagine that the
error could be that my android app isnt connected to my database but
idk.................................................................................................................................................................................................................
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
public class register extends AppCompatActivity {
private EditText etName, etEmail, etPassword, etReenterPassword;
private TextView tvStatus;
private Button btnRegister;
private String URL = "http://10.0.2.2/login.register.php";
private String name, email, password, reenterPassword;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
etName = findViewById(R.id.etName);
etEmail = findViewById(R.id.etEmail);
etPassword = findViewById(R.id.etPassword);
etReenterPassword = findViewById(R.id.etReenterPassword);
tvStatus = findViewById(R.id.tvStatus);
btnRegister = findViewById(R.id.btnRegister);
name = email = password = reenterPassword = "";
}
public void save(View view){
name = etName.getText().toString().trim();
email = etEmail.getText().toString().trim();
password = etPassword.getText().toString().trim();
reenterPassword = etReenterPassword.getText().toString().trim();
if(!password.equals(reenterPassword)){
Toast.makeText(this , "Password mismatch", Toast.LENGTH_SHORT).show();
}
else if(!name.equals("")&& !email.equals("") && !password.equals("")){
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if (response.equals("success")) {
tvStatus.setText("Successfully registered");
btnRegister.setClickable(false);
} else if (response.equals("failure")) {
tvStatus.setText("something went wrong!");
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.toString().trim(), Toast.LENGTH_SHORT).show();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> data = new HashMap<>();
data.put("name", name);
data.put("email", email);
data.put("password", password);
return data;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
}
public void login(View view){
Intent intent = new Intent (this, MainActivity.class);
startActivity(intent);
finish();
}
}

How to pass data from one activity to another activity

I'm creating an event app which contains a list of events in recyclerview.
The events recyclerview consists of the event name, image, date and time, heart image (example: heart shape like button on Instagram) which will change its color when the user clicks on the 'interested' button.
After clicking on any event its description appears and there are two buttons: 'interested' and 'going'. If the user clicks on 'interested' that heart color in the recyclerview will become yellow. The event will also get saved in another list where it will remain until that event is removed from the saved list.
So far I've completed saving that event in the saved list on clicking the 'interested' button. But I don't know how to change the heart color simultaneously and how to make it remain until the event is deleted from saved list.
First Activity calling recyclerview adapter
import android.content.Intent;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class EventActivity extends AppCompatActivity {
//this is the JSON Data URL
//make sure you are using the correct ip else it will not work
private static final String URL_PRODUCTS = "https://www.test.magicalballoons.co.in/priyanka/event.php?";
//a list to store all the products
List<Product> productList;
//the recyclerview
RecyclerView recyclerView;
ImageView homemenu;
//SwipeRefreshLayout swiper;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_event);
getSupportActionBar().hide();
homemenu = findViewById(R.id.homemenu);
// swiper = findViewById(R.id.swiper);
//getting the recyclerview from xml
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//initializing the productlist
productList = new ArrayList<>();
homemenu.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(EventActivity.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
});
//this method will fetch and parse json
//to display it in recyclerview
loadProducts();
}
private void loadProducts() {
/*
* Creating a String Request
* The request type is GET defined by first parameter
* The URL is defined in the second parameter
* Then we have a Response Listener and a Error Listener
* In response listener we will get the JSON response as a String
* */
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_PRODUCTS,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
//converting the string to json array object
JSONArray array = new JSONArray(response);
//traversing through all the object
for (int i = 0; i < array.length(); i++) {
//getting product object from json array
JSONObject product = array.getJSONObject(i);
//adding the product to product list
productList.add(new Product(
product.getString("id"),
product.getString("name"),
product.getString("date"),
product.getString("location"),
product.getString("image"),
product.getString("details")
));
}
//creating adapter object and setting it to recyclerview
RecyclerViewAdapter adapter = new RecyclerViewAdapter(EventActivity.this, productList);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(EventActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
//adding our stringrequest to queue
Volley.newRequestQueue(this).add(stringRequest);
}
public void onBackPressed() {
Intent intent = new Intent(EventActivity.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}
Recyclerview Adapter
import android.app.Activity;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.text.BreakIterator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import static com.example.priyankaregistration.URLs.URL_EVENT;
/**
* Created by Aws on 11/03/2018.
*/
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {
private RequestQueue requestQueue;
private JsonArrayRequest request;
private Context mContext;
private List<Product> mData;
RequestOptions option;
TextView total;
ImageView colorheart,heart;
// Dialog myDailog;
private Dialog myDialog;
public RecyclerViewAdapter(Context mContext, List<Product> mData) {
this.mContext = mContext;
this.mData = mData;
//this.swiper = swiper;
option=new RequestOptions().fitCenter().placeholder(R.drawable.background).error(R.drawable.background);
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view;
LayoutInflater inflater = LayoutInflater.from(mContext);
view = inflater.inflate(R.layout.fragment_conferences, parent, false);
final MyViewHolder viewHolder = new MyViewHolder(view);
myDialog = new Dialog(mContext);
colorheart = (ImageView) view.findViewById(R.id.colorheart);
heart = (ImageView) view.findViewById(R.id.heart);
total = (TextView) view.findViewById(R.id.count);
StringRequest stringRequest = new StringRequest(Request.Method.POST, URLs.URL_COUNT,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
//progressDialog.dismiss();
try {
JSONObject jsonObject = new JSONObject(response);
total.setText(jsonObject.getString("countid"));
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
params.put("eventid", mData.get(viewHolder.getAdapterPosition()).getId());
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(mContext);
requestQueue.add(stringRequest);
viewHolder.view_container.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(mContext, Description.class);
intent.putExtra("eventname",mData.get(viewHolder.getAdapterPosition()).getName());
intent.putExtra("eventid",mData.get(viewHolder.getAdapterPosition()).getId());
intent.putExtra("eventdate",mData.get(viewHolder.getAdapterPosition()).getDate());
intent.putExtra("eventloc",mData.get(viewHolder.getAdapterPosition()).getLocation());
intent.putExtra("eventimg",mData.get(viewHolder.getAdapterPosition()).getImage());
intent.putExtra("details",mData.get(viewHolder.getAdapterPosition()).getDetails());
mContext.startActivity(intent);
}
});
return viewHolder;
}
#Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
holder.textViewName.setText(mData.get(position).getName());
holder.textViewDate.setText("Date : " + mData.get(position).getDate());
holder.textViewLocation.setText("Time : " + mData.get(position).getLocation());
Glide.with(mContext).load(mData.get(position).getImage()).apply(option).into(holder.img_thumbnail);
}
#Override
public int getItemCount() {
return mData.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
TextView textViewName,textViewDate, textViewLocation,total;
ImageView img_thumbnail;
//LinearLayout view_container;
CardView view_container;
public MyViewHolder(View itemView) {
super(itemView);
view_container = itemView.findViewById(R.id.container);
textViewName = itemView.findViewById(R.id.textViewName);
textViewDate = itemView.findViewById(R.id.textViewDate);
textViewLocation = itemView.findViewById(R.id.textViewLocation);
total = itemView.findViewById(R.id.count);
img_thumbnail=itemView.findViewById(R.id.imageView);
}
}
}
This is second activity
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.support.design.widget.Snackbar;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class Description extends AppCompatActivity {
TextView textViewName,textViewDate, textViewLocation, details;
ImageView evimg,going,interest;
RequestOptions option;
ImageView homemenu;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details);
getSupportActionBar().hide();
option=new RequestOptions().fitCenter().placeholder(R.drawable.background).error(R.drawable.background);
textViewName = findViewById(R.id.textViewName);
evimg = findViewById(R.id.evimg);
details = findViewById(R.id.details);
going = findViewById(R.id.going);
interest = findViewById(R.id.interest);
homemenu = findViewById(R.id.homemenu);
textViewName.setText(getIntent().getStringExtra("eventname"));
//textViewDate.setText(getIntent().getStringExtra("eventdate"));
//textViewLocation.setText(getIntent().getStringExtra("eventloc"));
details.setText(getIntent().getStringExtra("details"));
details.setMovementMethod(new ScrollingMovementMethod());
Glide.with(this).load(getIntent().getStringExtra("eventimg")).apply(option).into(evimg);
going.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
StringRequest stringRequest = new StringRequest(Request.Method.GET, URLs.URL_EVENT+"?userid=" + SharedPrefManager.getInstance(getApplicationContext()).getUserId() + "&eventid="+ getIntent().getStringExtra("eventid"),
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
String message = jsonObject.getString("name");
Intent intent = new Intent(Description.this,Ticket.class);
intent.putExtra("code",message);
intent.putExtra("eventimg",getIntent().getStringExtra("eventimg"));
intent.putExtra("activity","NO");
// intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
jsonrequest();
startActivity(intent);
finish();
//Toast.makeText(mContext,message,Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
//params.put("userid",SharedPrefManager.getInstance(getApplicationContext()).getUserId());
//params.put("eventid",getIntent().getStringExtra("eventid"));
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
});
interest.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(final View v) {
StringRequest stringRequest = new StringRequest(Request.Method.POST, URLs.URL_EVENTSAVED ,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
//String message = jsonObject.getString("name")
Toast.makeText(getApplicationContext(),jsonObject.getString("message"),Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("userid",SharedPrefManager.getInstance(getApplicationContext()).getUserId());
params.put("eventid",getIntent().getStringExtra("eventid"));
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
});
homemenu.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Description.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
});
}
private void jsonrequest() {
StringRequest stringRequest = new StringRequest(Request.Method.POST, URLs.URL_EVENTDELETED,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
//progressDialog.dismiss();
try {
JSONObject jsonObject = new JSONObject(response);
Toast.makeText(getApplicationContext(),jsonObject.getString("Event removed from saved list"),Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
//progressDialog.dismiss();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("userid",SharedPrefManager.getInstance(getApplicationContext()).getUserId());
params.put("eventid",getIntent().getStringExtra("eventid"));
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
}
I'm having heart image in my recyclerview . And when i click on interest buttton in Description activity the heart image in recyclerview get change.

Assuming you are saving the events in some model class, what you can do is when calling the onBindViewHolder method of your adapter, check if the event is marked as save. If it is, then you either need to change the heart image to another heart image which is yellow, or you can apply a tint on the heart image to make it yellow.
You can change drawable by using this code
heartImageView.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.yellow_heart));
You can apply tint by using this code
heartImageView.setColorFilter(Color.argb(255, 255, 255, 0))
EDIT (Based on comment)
If the heart is in the first activity and the interested button is in the second activity what you need to do is to save the state of the event when you click on the interested button. Once you go back to the the first activity, you can check the state of the event and then update the image by using any of the above two methods.
EDIT 2 (Based on new code shared)
After you get the response from your Volley call, you should save the event id somewhere to keep track of which events you are interested in (this can be in either a model class or some global list). When you go back to your first activity (which contains the recyclerview), you need to check each event id with the stored event id list that you have and change the heart for each event that matches.

You can do this with the help for startActivityforresult
In Activity1, start Activity2 as:
Intent i = new Intent(this, Activity2.class);
startActivityForResult(i, 1);
In Activity2, use setResult for sending data back:
Intent intent = new Intent();
intent.putExtra("updatedArraylist", "arraylist")
setResult(RESULT_OK, intent);
finish();
And in Activity1, receive data with onActivityResult:
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if(resultCode == RESULT_OK) {
String strArrayList =
data.getStringExtra("updatedArraylist");
Gson gson = new Gson();
Type youListType = new TypeToken<List<Model>>() {
}.getType();
List<Model> yourTypeList = gson.fromJson(strArrayList,
yourListType);
ArrayList finalArraylist = new ArrayList<>(yourTypeList);
yourArraylist.addAll(finalArraylist);
youtAdapter.notifyDataSetChanged();
}
}
}

You can apply color onclick event to heart button like following code :
your_image_id.setBackgroundColor(getResources().getColor(R.color.yellow));

In first activity
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
startActivityForResult(intent, 100);
From second activity, you have to execute the below code before the activity getting destroyed by finish() or back press (For this you can override onBackPressed of second activity and remove the super class call and call the below method).
private void exitWithResult(){
Intent returnIntent = new Intent();
returnIntent.putExtra("result", "Id of selected item");
setResult(Activity.RESULT_OK, returnIntent);
finish();
}
Again in first activity you have to handle the result inside onActivityResult method.
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
if (requestCode == 100) {
if(resultCode == Activity.RESULT_OK){
String result=data.getStringExtra("result");
Log.e("DATA", "" + result);
}
if (resultCode == Activity.RESULT_CANCELED) {
//Write your code if there's no result
Log.e("DATA", "No result");
}
}
}
Update
You can use an interface as callback from adapter to activity. startActivityForResult canbe called inside the callback method of interface. You have to pass callback interface to adapter through adapter constructor along with data set.
declare this interface inside adapter
public interface AdapterCallback{
void onAdapterSelected(int pos);
}
And in first activity implement the interface like this.
MyAdapter.AdapterCallback callback = new MyAdapter.AdapterCallback() {
#Override
public void onAdapterSelected(int pos) {
Intent intent = new Intent(getApplicationContext(),
SecondActivity.class);
startActivityForResult(intent, 100);
}
};
Then set adapter like this.
RecyclerView rv = findViewById(R.id.rv_list);
rv.setHasFixedSize(true);
rv.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
MyAdapter adapter = new MyAdapter(callback); //This is the only change
rv.setAdapter(adapter);
Changes in adapter below. (You should pass list data along with call back as you already does)
private AdapterCallback callback;
public MyAdapter(AdapterCallback callback) {
this.callback = callback;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder viewHolder, final int i) {
viewHolder.mBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
callback.onAdapterSelected(i);
}
});
}
Interface also come inside adapter. I am not repeating it here as i already mentioned at first

how do I pass an u_id value to another activity?

Here is my main file where i get u_id and other data but i pass u_id text to other activity
Mainactivity.java
package com.desktop.app;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.desktop.app.Stitle.EXTRA_TITLE;
public class MainActivity extends AppCompatActivity {
Button signup,login,learnmore ;
EditText ed1,ed2,u_id;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
signup = (Button) findViewById(R.id.signupbutton);
learnmore = (Button) findViewById(R.id.learnmore);
login = (Button) findViewById(R.id.loginbutton);
ed1 = (EditText) findViewById(R.id.emailedittext);
u_id = (EditText) findViewById(R.id.uid);
ed2 = (EditText) findViewById(R.id.passwordedittext);
signup.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent in = new Intent(MainActivity.this,Activity2.class);
startActivity(in);
}
});
learnmore.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent in = new Intent(MainActivity.this,Activity1.class);
startActivity(in);
}
});
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String email = ed1.getText().toString().trim();
String password = ed2.getText().toString().trim();
final String log_id = u_id.getText().toString();
if(email.isEmpty()){
ed1.setError("Fill this field");
ed1.requestFocus();
return;
}
if(password.isEmpty()){
ed2.setError("Fill this field");
ed2.requestFocus();
return;
}
if(log_id.isEmpty()){
u_id.setError("Fill this field");
u_id.requestFocus();
return;
}
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
login();
Intent i = new Intent (MainActivity.this,fullview.class);
Bundle b =new Bundle();
b.putString("text", String.valueOf(u_id));
i.putExtras(b);
startActivity(i);
}
});
}
private void login(){
String url= "http://192.168.0.136/fyp/andr_log.php";
final RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if (response.trim().equals("Login Successfull")){
Toast.makeText(getApplicationContext(), "Login Successfull",Toast.LENGTH_LONG).show();
Intent in = new Intent(MainActivity.this,Search.class);
startActivity(in);
}
else {
Toast.makeText(getApplicationContext(), "Login Unsuccessfull",Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "error:" +error.toString() ,Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Email", ed1.getText().toString().trim() );
params.put("uid", u_id.getText().toString().trim() );
params.put("Password", ed2.getText().toString().trim() );
return params;
}
};
requestQueue.add(stringRequest);
}});
}
}
fullview.java
package com.desktop.app;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static android.support.v7.app.AlertDialog.*;
import static com.desktop.app.Stitle.EXTRA_AUTHOR;
import static com.desktop.app.Stitle.EXTRA_HR;
import static com.desktop.app.Stitle.EXTRA_PUBLISHER;
import static com.desktop.app.Stitle.EXTRA_PUBY;
import static com.desktop.app.Stitle.EXTRA_ACC;
import static com.desktop.app.Stitle.EXTRA_RAK;
import static com.desktop.app.Stitle.EXTRA_STATUS;
import static com.desktop.app.Stitle.EXTRA_TITLE;
import static com.desktop.app.Stitle.EXTRA_VR;
public class fullview extends AppCompatActivity {
Button location, avail, request;
TextView textviewtitle, textviewauthors, textviewpublisher, textviewpubyear,textviewacc,u_id;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fullview);
Intent intent = getIntent();
Bundle b = getIntent().getExtras();
String id= b.getString("text");
u_id= findViewById(R.id.uid);
String title = intent.getStringExtra(EXTRA_TITLE);
String author = intent.getStringExtra(EXTRA_AUTHOR);
String publisher = intent.getStringExtra(EXTRA_PUBLISHER);
int puby = intent.getIntExtra(EXTRA_PUBY,0);
int accc = intent.getIntExtra(EXTRA_ACC,0);
final int rak = intent.getIntExtra(EXTRA_RAK,0);
final int hr = intent.getIntExtra(EXTRA_HR,0);
final int vr = intent.getIntExtra(EXTRA_VR,0);
final String status = intent.getStringExtra(EXTRA_STATUS);
textviewtitle = findViewById(R.id.textviewtitle);
textviewauthors = findViewById(R.id.textviewauthors);
textviewpublisher = findViewById(R.id.textviewpublisher);
textviewpubyear = findViewById(R.id.textviewpubyear);
textviewacc = findViewById(R.id.textviewacc);
textviewtitle.setText(title);
textviewauthors.setText(author);
textviewpublisher.setText(publisher);
textviewpubyear.setText(String.valueOf(puby));
textviewacc.setText(String.valueOf(accc));
location = findViewById(R.id.loc);
location.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
{
AlertDialog.Builder builder=new AlertDialog.Builder(fullview.this);
builder.setTitle("Location");
builder.setMessage("Rak-No :: " + rak + "\nColumn :: " + hr +"\nRow :: " + vr);
AlertDialog alertDialog=null;
builder.setPositiveButton("Close", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(fullview.this,"Closed",Toast.LENGTH_SHORT).show();
}
});
alertDialog=builder.create();
alertDialog.show();
}
}
});
avail = findViewById(R.id.avail);
avail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view)
{
AlertDialog.Builder builder=new AlertDialog.Builder(fullview.this);
{
if (status.equals("yes")) {
builder.setTitle("Availablity");
builder.setMessage("Available");
} else {
builder.setTitle("Availablity");
builder.setMessage("Not Available");
}
}
AlertDialog alertDialog=null;
builder.setPositiveButton("Close", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(fullview.this,"Closed",Toast.LENGTH_SHORT).show();
}
});
alertDialog=builder.create();
alertDialog.show();
}
});
request= findViewById(R.id.request);
request.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
request();
}
});
}
private void request(){
String url= "http://192.168.0.136/fyp/bookreq.php";
final RequestQueue requestQueue = Volley.newRequestQueue(fullview.this);
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if (response.trim().equals("successfull")){
Toast.makeText(getApplicationContext(), "Go to Admin For Approval",Toast.LENGTH_LONG).show();
Intent in = new Intent(fullview.this,Search.class);
startActivity(in);
}
else {
Toast.makeText(getApplicationContext(), "Already Requested",Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "error:" +error.toString() ,Toast.LENGTH_LONG).show();
}
}){
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Title", textviewtitle.getText().toString().trim());
params.put("Author", textviewauthors.getText().toString().trim());
params.put("Publisher", textviewpublisher.getText().toString().trim());
params.put("Acc", textviewacc.getText().toString().trim());
params.put("Puby", textviewpubyear.getText().toString().trim());
Log.i("Info",textviewtitle.getText().toString().trim());
return params;
}
};
requestQueue.add(stringRequest);
}
}
Here is my second file above where i want to shoe u_id text but i done with this to pass u_id text to other activity
Intent i = new Intent (MainActivity.this,fullview.class);
Bundle b =new Bundle();
b.putString("text", String.valueOf(u_id));
i.putExtras(b);
startActivity(i);
this code i use to pass u_id text and next activity code i use below code
Bundle b = getIntent().getExtras();
String id= b.getString("text");
u_id= findViewById(R.id.uid);

This is what your problem is.
Intent i = new Intent (MainActivity.this,fullview.class);
Bundle b =new Bundle();
b.putString("text", String.valueOf(u_id));
i.putExtras(b);
startActivity(i);
Change this line
b.putString("text", String.valueOf(u_id));
to
b.putString("text", u_id.getText().toString().trim());
EDIT:
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String email = ed1.getText().toString().trim();
String password = ed2.getText().toString().trim();
final String log_id = u_id.getText().toString();
if(email.isEmpty()){
ed1.setError("Fill this field");
ed1.requestFocus();
}else if(password.isEmpty()){
ed2.setError("Fill this field");
ed2.requestFocus();
} else if(log_id.isEmpty()){
u_id.setError("Fill this field");
u_id.requestFocus();
} else {
login();
Intent i = new Intent(MainActivity.this,fullview.class);
Bundle b =new Bundle();
b.putString("text", u_id.getText().toString().trim());
i.putExtras(b);
startActivity(i);
}
}

Login Module doesn't work

I am developing an android application with help of:
https://www.youtube.com/watch?v=T7Z4GVFaT4A&list=PLe60o7ed8E-TztoF2K3y4VdDgT6APZ0ka&index=4
When I reciprocated the same tutorial, the application worked absolutely fine. Then I modulated the application to fit into my application idea. The Registration was successful and stored data into db as expected.
But facing issue in LoginActivity.
Expected way the app should proceed: When I click blogin button, it should validate the user stored in db and open corresponding AdminViewActivity.
What actually happening is that when i click the button blogin, nothing happens. The table name is "allusers" and already contains values. I type the same values while logging in through my application.
Please help me find where I could have gone wrong. Thanks in advance.
LoginActivity.java
package com.example.android.ablo;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
public class LoginActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
final Button bregister = (Button) findViewById(R.id.bregister);
final Button blogin = (Button) findViewById(R.id.blogin);
final EditText etusername=(EditText)findViewById(R.id.etusername);
final EditText etpassword=(EditText)findViewById(R.id.etpassword);
bregister.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(LoginActivity.this, RegisterActivity.class);
LoginActivity.this.startActivity(i);
}
});
blogin.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
final String username=etusername.getText().toString();
final String password=etpassword.getText().toString();
Response.Listener<String> responseListener= new Response.Listener<String>(){
#Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
boolean success= jsonResponse.getBoolean("success");
if(success){
String name= jsonResponse.getString("name");
Intent i=new Intent(LoginActivity.this,AdminViewActivity.class);
i.putExtra("name",name);
LoginActivity.this.startActivity(i);
}else{
AlertDialog.Builder builder= new AlertDialog.Builder(LoginActivity.this);
builder.setMessage("Login Failed").setNegativeButton("Retry",null).create().show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
LoginRequest loginRequest=new LoginRequest(username,password,responseListener );
RequestQueue queue= Volley.newRequestQueue(LoginActivity.this);
queue.add(loginRequest);
}
});
}
}
LoginRequest.java
package com.example.android.ablo;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import java.util.HashMap;
import java.util.Map;
/**
* Created by User on 21-01-2018.
*/
public class LoginRequest extends StringRequest {
private static final String LOGIN_REQUEST_URL = "http://ablo.000webhostapp.com/AbloLogin.php";
private Map<String,String> params;
public LoginRequest( String username, String password, Response.Listener<String> listener){
super(Request.Method.POST, LOGIN_REQUEST_URL, listener, null );
params= new HashMap<>();
params.put("username",username);
params.put("password",password);
}
#Override
public Map<String, String> getParams() {
return params;
}
}
AbloLogin.php
<?php
$con = mysqli_connect("localhost", "id4335430_ablo_users", "wontreveal", "id4335430_ablo_users");
$username = $_POST["username"];
$password = $_POST["password"];
$statement = mysqli_prepare($con, "SELECT * FROM allusers WHERE username = ? AND password = ?");
mysqli_stmt_bind_param($statement, "ss", $username, $password);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result($statement);
mysqli_stmt_bind_result($statement, $allusersID, $name, $username, $password);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
$response["success"] = true;
$response["name"] = $name;
$response["username"] = $username;
$response["password"] = $password;
}
echo json_encode($response);
?>
AdminViewActivity.java
package com.example.android.ablo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import org.w3c.dom.Text;
public class AdminViewActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_view);
final Button badduser = (Button) findViewById(R.id.badduser);
final Button bmanageusers = (Button) findViewById(R.id.bmanageusers);
final TextView tvadmin =(TextView) findViewById(R.id.tvadmin);
Intent i= getIntent();
String name= i.getStringExtra("name");
String message= name+ "'s Admin View";
tvadmin.setText(message);
badduser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(AdminViewActivity.this, CreateUserActivity.class);
AdminViewActivity.this.startActivity(i);
}
});
bmanageusers.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(AdminViewActivity.this, ManageUsersActivity.class);
AdminViewActivity.this.startActivity(i);
}
});
}
}