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JAVA having trouble retrieving volley result variable value in another class

I have two classes in my android Java Project:
one is API which is inside a local android Module Library that has this code
package com.example.validationchecklib;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.widget.Toast;
import android.app.Application;
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.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class API extends Application{
public static int result;
public static int resultInApi;
public int checkSubscription(String packageName, String purchaseCode, RequestQueue q) {
String apiUrl = "https://package.evisions.tech/check_validation.php?package_name=" + packageName;
// creating a new variable for our request queue
//RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
// in this case the data we are getting is in the form
// of array so we are making a json array request.
// below is the line where we are making an json array
// request and then extracting data from each json object.
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, apiUrl, null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
//creating a new Json object and getting each
//object from our json array.
try {
// we are getting each json object.
JSONObject responseObj = response.getJSONObject(i);
// now we get our response from API in json object format.
// in below line we are extracting a string with
// its key value from our json object.
// similarly we are extracting all the strings from our json object.
String apiPackage = responseObj.getString("package_name");
String apiPurchaseCode = responseObj.getString("purchase_code");
int apiStatus = responseObj.getInt("status");
if (apiStatus == 1) {
if (apiPackage.equalsIgnoreCase(packageName) && apiPurchaseCode.equalsIgnoreCase(purchaseCode)) {
//subcription status is valid and user inputed data matches with api data
result = 1;
System.out.println("Result in Api = "+result);
break;
}
} else if (apiStatus == 0) {
result = 0;
System.out.println("Result in Api = "+result);
break;
} else {
result = 2;
System.out.println("Result in Api = "+result);
break;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
result = 3;
System.out.println("Result in Api = Failed to get the data...");
}
});
q.add(jsonArrayRequest);
return result;
}
}
The second class is MainActivity where I want to retrieve the value from the checkSubsccription() method that is on API class but I am getting 0 even when the request from volley has value 1.
You can test the request using this URL: https://package.evisions.tech/check_validation.php?package_name=aaaa
this is the code for MainActivity
package com.example.aaaa;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
import com.example.validationchecklib.Subscription;
import com.example.validationchecklib.API;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
//Sample implementation of the Purchase validation android Library
public String packageName, purchaseCode;
public TextView txtPackageName, txtPurchaseCode;
public Button btnResult;
int serverResponse;
public String r;
private ArrayList<Subscription> subscriptionModalArrayList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
subscriptionModalArrayList = new ArrayList<>();
txtPackageName = findViewById(R.id.edtPackageName);
txtPurchaseCode = findViewById(R.id.edtPurchaseCode);
btnResult = findViewById(R.id.btnVerify);
RequestQueue queue = Volley.newRequestQueue(this);
API api = new API();
btnResult.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
packageName = txtPackageName.getText().toString().trim();
purchaseCode = txtPurchaseCode.getText().toString().trim();
serverResponse = api.checkSubscription(packageName,purchaseCode, queue);
System.out.println("Result = "+serverResponse);
if(api.result == 1){
subscriptionModalArrayList.add(new Subscription(packageName,purchaseCode));
Intent intent = new Intent(MainActivity.this, ValidationResult.class);
startActivity(intent);
}
if(api.result == 0){
Toast.makeText(MainActivity.this, "Inactive Subscription", Toast.LENGTH_LONG).show();
System.exit(1);
}
if(serverResponse == 2 || serverResponse == 3){
Toast.makeText(MainActivity.this, "Failed to fetch data from API or other Error...", Toast.LENGTH_LONG).show();
System.exit(1);
}
txtPackageName.setText("");
txtPurchaseCode.setText("");
}
});
}
}

The request you are making is asynchronous and you must wait to get the response from it.
The behavior you are seeing (always returning zero) because the result variable has not been initialized and defaults to zero.
public static int result;
You can pass a callback to your checkSubscription method which will be called when you have a result from the request (either failure or success).
You can do this by defining an interface like so:
public interface Callback {
public void onSuccess(int result);
public void onFailure(String error);
}
And making your activity implement this method:
public class MainActivity extends AppCompatActivity implements Callback {
...
public void onSuccess(int result) {
//Your logic here
}
public void onFailure(String error) {
//Your logic here
}
}
And make sure to pass the activity to your API:
public int checkSubscription(String packageName, String purchaseCode, RequestQueue q, Callback callback) {
.....
callback.onSuccess(result)
public void onErrorResponse(VolleyError error) {
result = 3;
System.out.println("Result in Api = Failed to get the data...");
callback.onError("YOUR_ERROR_MESSAGE");
}
}
Disclaimer : the above code is just a rough outline and should be
tested

Socket Python-Server and Java - Client in android studio where java is not able to connect to the python server

I have successfully built a python server which even works but when java from android studio tries to connect to it fails with whole bunch of errors. I have understood that it fails while creating a new socket object but why that I don't know.
This is Java client, see at the end of the code particularly for the issue where I have created new Socket object:
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Application;
import android.content.ActivityNotFoundException;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.media.Image;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.provider.Settings;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridLayout;
import android.widget.TextView;
import com.chaquo.python.PyObject;
import com.chaquo.python.Python;
import com.chaquo.python.android.AndroidPlatform;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.ml.vision.FirebaseVision;
import com.google.firebase.ml.vision.common.FirebaseVisionImage;
import com.google.firebase.ml.vision.text.FirebaseVisionText;
import com.google.firebase.ml.vision.text.FirebaseVisionTextDetector;
import org.w3c.dom.Text;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Random;
import java.net.*;
import java.io.*;
import static android.Manifest.permission.ACCESS_FINE_LOCATION;
import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private Button btnRecognize;
private SpeechRecognizer speechRecognizer;
static EditText ET_ShowRecognized;
String locality;
private Intent intent;
private String ET_ShowRecognizedText;
private String ProcessingText;
//private FusedLocationProviderClient fusedLocationProviderClient;
//Geocoder geocoder;
Python py;
PyObject pyobj;
PyObject obj;
String currentDate;
String currentTime;
static TextToSpeech tts;
Uri imageURI;
ContentValues contentValues;
Intent cameraIntent;
static final int REQUEST_IMAGE_CAPTURE = 1;
Image mediaImage;
FirebaseVisionImage firebaseVisionImage;
static Bitmap imageBitmap;
FirebaseVisionTextDetector textDetector;
String imgText;
Intent CameraIntent;
static Thread sent;
static Thread receive;
static Socket socket;
InputStreamReader in;
BufferedReader bf;
String ServerOutput;
PrintWriter writer;
String ServerInput;
#SuppressLint({"SetTextI18n", "ClickableViewAccessibility", "MissingPermission"})
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions(this, new String[]{RECORD_AUDIO, WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE, ACCESS_FINE_LOCATION, CAMERA}, PackageManager.PERMISSION_GRANTED);
ET_ShowRecognized = findViewById(R.id.ET_ShowRecognized);
btnRecognize = findViewById(R.id.btnRecognize);
/*fusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
#Override
public void onComplete(#NonNull Task<Location> task) {
Location location = task.getResult();
if(location != null){
geocoder = new Geocoder(MainActivity.this, Locale.getDefault());
try {
List<Address> address = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
locality = address.get(0).getLocality();
} catch (IOException e) {
;
}
}
}
});
if(!Python.isStarted()){
Python.start(new AndroidPlatform(this));
}
py = Python.getInstance();
pyobj = py.getModule("WolframAlpha");
obj = pyobj.callAttr("main", locality);*/
tts = new TextToSpeech(MainActivity.this, new TextToSpeech.OnInitListener() {
#Override
public void onInit(int i) {
if (i == TextToSpeech.SUCCESS) {
tts.setLanguage(Locale.ENGLISH);
}
tts.speak("Hi you successfully ran me.", TextToSpeech.QUEUE_FLUSH, null, null);
tts.speak("Seems good to meet you.", TextToSpeech.QUEUE_FLUSH, null, null);
}
});
//currentDate = new SimpleDateFormat("dd-MM-yyyy", Locale.getDefault()).format(new Date());
//currentTime = new SimpleDateFormat("HH:mm:ss", Locale.getDefault()).format(new Date());
//textToSpeech.speak("Hi! I am your personal assistant. Today date is something something ", TextToSpeech.QUEUE_FLUSH, null, null);
//Speak("Today's weather forecast for the current location is " + obj.toString());
intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
speechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
speechRecognizer.setRecognitionListener(new RecognitionListener() {
#Override
public void onReadyForSpeech(Bundle bundle) {
}
#Override
public void onBeginningOfSpeech() {
}
#Override
public void onRmsChanged(float v) {
}
#Override
public void onBufferReceived(byte[] bytes) {
}
#Override
public void onEndOfSpeech() {
}
#Override
public void onError(int i) {
}
#Override
public void onResults(Bundle bundle) {
ArrayList<String> mathches = bundle.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
if (mathches != null) {
ET_ShowRecognized.setText(mathches.get(0));
process();
}
}
#Override
public void onPartialResults(Bundle bundle) {
}
#Override
public void onEvent(int i, Bundle bundle) {
}
});
btnRecognize.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_UP:
speechRecognizer.stopListening();
break;
case MotionEvent.ACTION_DOWN:
ET_ShowRecognized.setText(null);
ET_ShowRecognized.setText("Listening...");
speechRecognizer.startListening(intent);
break;
default:
break;
}
return false;
}
});
}
public void process() {
ProcessingText = ET_ShowRecognized.getText().toString().toLowerCase();
if(ProcessingText.contains("hello")) {
tts.speak("Hi! I hope all is well.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("hi")){
tts.speak("Hello! Nice to meet you.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("your name")){
tts.speak("My name is assistant.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("recognise text")){
tts.speak("Opening Camera.", TextToSpeech.QUEUE_FLUSH, null, null);
dispatchTakePictureIntent();
}
else if(ProcessingText.contains("bye")){
finish();
System.exit(0);
}
else if(ProcessingText.contains("current temperature")){
/*try {
socket = new Socket("192.168.43.203",12345);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
sent = new Thread(new Runnable(){
#Override
public void run() {
try {
bf = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true){
ServerOutput = bf.readLine().toString();
MainActivity.tts.speak(ServerOutput, TextToSpeech.QUEUE_FLUSH, null, null);
MainActivity.ET_ShowRecognized.setText(ServerOutput);
}
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
sent.start();
try {
sent.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
recieve_data();
}else {
tts.speak(ProcessingText, TextToSpeech.QUEUE_FLUSH, null, null);
}
}
private void dispatchTakePictureIntent() {
CameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
startActivityForResult(CameraIntent, REQUEST_IMAGE_CAPTURE);
} catch (ActivityNotFoundException e) {
// display error state to the user
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
imageBitmap = (Bitmap) extras.get("data");
//imageView.setImageBitmap(imageBitmap);
detectTextFromImage();
}
}
private void detectTextFromImage() {
firebaseVisionImage = FirebaseVisionImage.fromBitmap(imageBitmap);
textDetector = FirebaseVision.getInstance().getVisionTextDetector();
textDetector.detectInImage(firebaseVisionImage).addOnSuccessListener(new OnSuccessListener<FirebaseVisionText>() {
#Override
public void onSuccess(FirebaseVisionText firebaseVisionText) {
//speakTextFromImage(firebaseVisionText);
getImgText(firebaseVisionText);
}
}).addOnFailureListener(new OnFailureListener() {
#SuppressLint("SetTextI18n")
#Override
public void onFailure(#NonNull Exception e) {
tts.speak("Something went wrong. Please try again later or try with another image.", TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("Something went wrong. Please try again later or try with another image.");
}
});
}
#SuppressLint("SetTextI18n")
private void getImgText(FirebaseVisionText firebaseVisionText){
List<FirebaseVisionText.Block> blockList = firebaseVisionText.getBlocks();
if(blockList.size() == 0) {
tts.speak("I think this image contains no text.", TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("I think this image contains no text.");
}else{
for(FirebaseVisionText.Block block : firebaseVisionText.getBlocks()){
imgText = block.getText().toString();
tts.speak("The text in the image is as follows : " + imgText, TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("The text in the image is as follows : " + imgText);
}
}
}
public void recieve_data(){
ServerInput = "Java client is successfully connected with the server ";
BackgroundTask bt = new BackgroundTask();
bt.execute(ServerInput);
}
class BackgroundTask extends AsyncTask<String, Void, Void>{
#Override
protected Void doInBackground(String... voids) {
try{
String message = voids[0];
socket = new Socket("myIP", 24224);
writer = new PrintWriter(socket.getOutputStream());
writer.write(message);
writer.flush();
writer.close();
socket.close();
}catch (IOException e){
e.printStackTrace();
}
return null;
}
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onResume() {
super.onResume();
}
}
This is my python server code:
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("Socket successfully created")
try:
port = 24224
s.bind(("", port))
print("socket binded to %s" %(port))
except socket.error as err:
print('Bind failed. Error Code : ' .format(err))
s.listen(10)
while True:
conn, addr = s.accept()
print('Got connection from', addr)
message = conn.recv(1024)
print("Client : " + message)
conn.close()
Now the run view in the android studio:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.maitreyastudio.ai, PID: 17690
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.maitreyastudio.ai/com.maitreyastudio.ai.MainActivity}: android.os.NetworkOnMainThreadException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2789)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1318)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:340)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
at java.net.Socket.connect(Socket.java:616)
at java.net.Socket.connect(Socket.java:548)
at java.net.Socket.<init>(Socket.java:440)
at java.net.Socket.<init>(Socket.java:223)
at com.maitreyastudio.ai.MainActivity.onCreate(MainActivity.java:127)
at android.app.Activity.performCreate(Activity.java:6712)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2677)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2789) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527) 
at android.os.Handler.dispatchMessage(Handler.java:110) 
at android.os.Looper.loop(Looper.java:203) 
at android.app.ActivityThread.main(ActivityThread.java:6251) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924) 

Looking at the stack trace I see that you are trying to connect on the ui thread which
is causing the crash. You need to move the connection logic in to its own thread
Here is a link to the documentation that will help you
https://developer.android.com/guide/components/processes-and-threads#Threads
try this for main activity
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Application;
import android.content.ActivityNotFoundException;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.media.Image;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.provider.Settings;
import android.speech.RecognitionListener;
import android.speech.RecognizerIntent;
import android.speech.SpeechRecognizer;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridLayout;
import android.widget.TextView;
import com.chaquo.python.PyObject;
import com.chaquo.python.Python;
import com.chaquo.python.android.AndroidPlatform;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.ml.vision.FirebaseVision;
import com.google.firebase.ml.vision.common.FirebaseVisionImage;
import com.google.firebase.ml.vision.text.FirebaseVisionText;
import com.google.firebase.ml.vision.text.FirebaseVisionTextDetector;
import org.w3c.dom.Text;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Random;
import java.net.*;
import java.io.*;
import static android.Manifest.permission.ACCESS_FINE_LOCATION;
import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private Button btnRecognize;
private SpeechRecognizer speechRecognizer;
static EditText ET_ShowRecognized;
String locality;
private Intent intent;
private String ET_ShowRecognizedText;
private String ProcessingText;
//private FusedLocationProviderClient fusedLocationProviderClient;
//Geocoder geocoder;
Python py;
PyObject pyobj;
PyObject obj;
String currentDate;
String currentTime;
static TextToSpeech tts;
Uri imageURI;
ContentValues contentValues;
Intent cameraIntent;
static final int REQUEST_IMAGE_CAPTURE = 1;
Image mediaImage;
FirebaseVisionImage firebaseVisionImage;
static Bitmap imageBitmap;
FirebaseVisionTextDetector textDetector;
String imgText;
Intent CameraIntent;
static Thread sent;
static Thread receive;
static Socket socket;
InputStreamReader in;
BufferedReader bf;
String ServerOutput;
PrintWriter writer;
String ServerInput;
#SuppressLint({"SetTextI18n", "ClickableViewAccessibility", "MissingPermission"})
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions(this, new String[]{RECORD_AUDIO, WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE, ACCESS_FINE_LOCATION, CAMERA}, PackageManager.PERMISSION_GRANTED);
ET_ShowRecognized = findViewById(R.id.ET_ShowRecognized);
btnRecognize = findViewById(R.id.btnRecognize);
/*fusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
#Override
public void onComplete(#NonNull Task<Location> task) {
Location location = task.getResult();
if(location != null){
geocoder = new Geocoder(MainActivity.this, Locale.getDefault());
try {
List<Address> address = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
locality = address.get(0).getLocality();
} catch (IOException e) {
;
}
}
}
});
if(!Python.isStarted()){
Python.start(new AndroidPlatform(this));
}
py = Python.getInstance();
pyobj = py.getModule("WolframAlpha");
obj = pyobj.callAttr("main", locality);*/
tts = new TextToSpeech(MainActivity.this, new TextToSpeech.OnInitListener() {
#Override
public void onInit(int i) {
if (i == TextToSpeech.SUCCESS) {
tts.setLanguage(Locale.ENGLISH);
}
tts.speak("Hi you successfully ran me.", TextToSpeech.QUEUE_FLUSH, null, null);
tts.speak("Seems good to meet you.", TextToSpeech.QUEUE_FLUSH, null, null);
}
});
//currentDate = new SimpleDateFormat("dd-MM-yyyy", Locale.getDefault()).format(new Date());
//currentTime = new SimpleDateFormat("HH:mm:ss", Locale.getDefault()).format(new Date());
//textToSpeech.speak("Hi! I am your personal assistant. Today date is something something ", TextToSpeech.QUEUE_FLUSH, null, null);
//Speak("Today's weather forecast for the current location is " + obj.toString());
intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
speechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
speechRecognizer.setRecognitionListener(new RecognitionListener() {
#Override
public void onReadyForSpeech(Bundle bundle) {
}
#Override
public void onBeginningOfSpeech() {
}
#Override
public void onRmsChanged(float v) {
}
#Override
public void onBufferReceived(byte[] bytes) {
}
#Override
public void onEndOfSpeech() {
}
#Override
public void onError(int i) {
}
#Override
public void onResults(Bundle bundle) {
ArrayList<String> mathches = bundle.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
if (mathches != null) {
ET_ShowRecognized.setText(mathches.get(0));
process();
}
}
#Override
public void onPartialResults(Bundle bundle) {
}
#Override
public void onEvent(int i, Bundle bundle) {
}
});
btnRecognize.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_UP:
speechRecognizer.stopListening();
break;
case MotionEvent.ACTION_DOWN:
ET_ShowRecognized.setText(null);
ET_ShowRecognized.setText("Listening...");
speechRecognizer.startListening(intent);
break;
default:
break;
}
return false;
}
});
}
public void process() {
ProcessingText = ET_ShowRecognized.getText().toString().toLowerCase();
if(ProcessingText.contains("hello")) {
tts.speak("Hi! I hope all is well.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("hi")){
tts.speak("Hello! Nice to meet you.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("your name")){
tts.speak("My name is assistant.", TextToSpeech.QUEUE_FLUSH, null, null);
}
else if(ProcessingText.contains("recognise text")){
tts.speak("Opening Camera.", TextToSpeech.QUEUE_FLUSH, null, null);
dispatchTakePictureIntent();
}
else if(ProcessingText.contains("bye")){
finish();
System.exit(0);
}
else if(ProcessingText.contains("current temperature")){
sendTemp();
recieve_data();
}else {
tts.speak(ProcessingText, TextToSpeech.QUEUE_FLUSH, null, null);
}
}
private void dispatchTakePictureIntent() {
CameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
startActivityForResult(CameraIntent, REQUEST_IMAGE_CAPTURE);
} catch (ActivityNotFoundException e) {
// display error state to the user
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
imageBitmap = (Bitmap) extras.get("data");
//imageView.setImageBitmap(imageBitmap);
detectTextFromImage();
}
}
private void detectTextFromImage() {
firebaseVisionImage = FirebaseVisionImage.fromBitmap(imageBitmap);
textDetector = FirebaseVision.getInstance().getVisionTextDetector();
textDetector.detectInImage(firebaseVisionImage).addOnSuccessListener(new OnSuccessListener<FirebaseVisionText>() {
#Override
public void onSuccess(FirebaseVisionText firebaseVisionText) {
//speakTextFromImage(firebaseVisionText);
getImgText(firebaseVisionText);
}
}).addOnFailureListener(new OnFailureListener() {
#SuppressLint("SetTextI18n")
#Override
public void onFailure(#NonNull Exception e) {
tts.speak("Something went wrong. Please try again later or try with another image.", TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("Something went wrong. Please try again later or try with another image.");
}
});
}
#SuppressLint("SetTextI18n")
private void getImgText(FirebaseVisionText firebaseVisionText){
List<FirebaseVisionText.Block> blockList = firebaseVisionText.getBlocks();
if(blockList.size() == 0) {
tts.speak("I think this image contains no text.", TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("I think this image contains no text.");
}else{
for(FirebaseVisionText.Block block : firebaseVisionText.getBlocks()){
imgText = block.getText().toString();
tts.speak("The text in the image is as follows : " + imgText, TextToSpeech.QUEUE_FLUSH, null, null);
ET_ShowRecognized.setText("The text in the image is as follows : " + imgText);
}
}
}
public void recieve_data(){
ServerInput = "Java client is successfully connected with the server ";
BackgroundTask bt = new BackgroundTask();
bt.execute(ServerInput);
}
public void sendTemp(){
new TempBackgroundTask().execute();
}
class TempBackgroundTask extends AsyncTask<Void, String, Void>{
#Override
protected Void doInBackground(String... voids) {
try {
socket = new Socket("myIP",12345);
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
sent = new Thread(new Runnable(){
#Override
public void run() {
try {
bf = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true){
ServerOutput = bf.readLine().toString();
publishProgress(ServerOutput);
}
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
sent.start();
try {
sent.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#SuppressWarnings("unchecked")
#Override
protected void onProgressUpdate(String... text) {
MainActivity.tts.speak(text[0], TextToSpeech.QUEUE_FLUSH, null, null);
MainActivity.ET_ShowRecognized.setText(text[0]);
}
}
class BackgroundTask extends AsyncTask<String, Void, Void>{
#Override
protected Void doInBackground(String... voids) {
try{
String message = voids[0];
socket = new Socket("192.168.43.203", 24224);
writer = new PrintWriter(socket.getOutputStream());
writer.write(message);
writer.flush();
writer.close();
socket.close();
}catch (IOException e){
e.printStackTrace();
}
return null;
}
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onResume() {
super.onResume();
}
}

Create PDF File From Android Native Views

In our android application we have photo album capabilities. Which users are able to create their albums from their photos and after that we want users to be able to create a pdf file from that albums.(We are doing the same thing in IOS)
For achiving this, I've implemented the below solution. But when I executed the createPrintableFile method it creates and empty pdf file and I couldnt find why?
Does anyone have any idea about it
package com.kidokit.kidokit.helper;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.graphics.pdf.PdfDocument;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.print.PrintAttributes;
import android.print.pdf.PrintedPdfDocument;
import android.support.annotation.RequiresApi;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.Toast;
import com.kidokit.kidokit.R;
import com.kidokit.kidokit.network.NetworkModels;
import com.kidokit.kidokit.ui.StorybookView;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class MAPdfCreator
{
private FileOutputStream pdfFile = null;
private String filePath = null;
private Activity act;
private LayoutInflater inflater;
public MAPdfCreator(Activity act) throws FileNotFoundException
{
filePath = act.getFilesDir()+"/KidoKitAlbum.pdf";
pdfFile = new FileOutputStream(filePath);
this.act = act;
inflater = LayoutInflater.from(this.act);
}
public void createPrintableFile(List<NetworkModels.GetPhotosInAlbumRes.Photo> photos) throws IOException {
ArrayList<View> result = new ArrayList<View>();
int index = 0;
for (NetworkModels.GetPhotosInAlbumRes.Photo photo : photos) {
View myImageLayout = inflater.inflate(R.layout.view_storybook, null, false);
final StorybookView sbv = (StorybookView) myImageLayout.findViewById(R.id.sbv);
sbv.measure(480,853);
sbv.layout(0,0,480,853);
if (index == 0) {
/*
sbv.setTemplateLayout(R.layout.view_sb_cover);
sbv.setImage(photo.photoFile);
sbv.setLabel(photo.photoTitle);
sbv.setDate(photo.photoDate);
sbv.closeEditMode();
*/
} else {
sbv.setTemplateLayout(photo.getLayoutResource());
if (photo.photoFile != null && !photo.photoFile.equals("")) {
sbv.setImage(photo.photoFile);
}
if (photo.photoTitle != null) {
sbv.setLabel(photo.photoTitle);
}
if (photo.photoDate != null) {
sbv.setDate(photo.photoDate);
}
sbv.closeEditMode();
}
result.add(sbv);
index++;
}
convertViewsToPdf(result);
}
public void convertViewsToPdf(ArrayList<View> views) throws IOException {
if (Build.VERSION.SDK_INT >= 19) {
PrintAttributes printAttrs = new PrintAttributes.Builder().
setColorMode(PrintAttributes.COLOR_MODE_COLOR).
setMediaSize(PrintAttributes.MediaSize.NA_LETTER).
setResolution(new PrintAttributes.Resolution("KDK_LBL", "PRINT_SERVICE", 480, 853)).
setMinMargins(PrintAttributes.Margins.NO_MARGINS).
build();
PdfDocument document = new PdfDocument();
int index = 0;
for (View view : views) {
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(480,853,index).create();
PdfDocument.Page page = document.startPage(pageInfo);
view.draw(page.getCanvas());
document.finishPage(page);
index++;
}
document.writeTo(pdfFile);
document.close();
pdfFile.close();
File file = new File(filePath);
if(!file.exists()) {
System.out.println("FILE DOES NOT EXIST");
return;
}
this.openPdfFile();
}
}
public void openPdfFile()
{
Uri path = Uri.parse("content://"+act.getPackageName()+"/"+filePath);
Intent fileViewIntent = new Intent(Intent.ACTION_VIEW);
fileViewIntent.setDataAndType(path, "application/pdf");
String packageName = "com.adobe.reader";
fileViewIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
fileViewIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try {
act.startActivity(fileViewIntent);
} catch(ActivityNotFoundException e){
try {
act.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id="+packageName)));
} catch (android.content.ActivityNotFoundException anfe) {
act.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id="+packageName)));
}
} catch(Exception e){
Toast.makeText(act, "Can not open file: (" + filePath +")", Toast.LENGTH_SHORT).show();
}
}
}
This is the code which calls the abow createPrintableFile method
private void printAlbum(final int albumId)
{
NetworkManager.getPhotosInAlbum(albumId,new TokenCallback<NetworkModels.GetPhotosInAlbumRes>() {
#Override
public void onResponse(Call<NetworkModels.GetPhotosInAlbumRes> call, Response<NetworkModels.GetPhotosInAlbumRes> response) {
super.onResponse(call, response);
if (response.code() == 200) {
if (response.body().success) {
NetworkModels.GetPhotosInAlbumRes result = response.body();
try {
MAPdfCreator creator = new MAPdfCreator(currrentContext);
creator.createPrintableFile(result.photos);
} catch (java.io.IOException e) {
e.printStackTrace();
}
} else {
activity.progressDialog.dismiss();
activity.showSnackbar(activity.getText(R.string.unknown_error).toString());
}
} else {
activity.showSnackbar(activity.getText(R.string.server_error).toString());
}
}
#Override
public void onFailure(Call<NetworkModels.GetPhotosInAlbumRes> call, Throwable t) {
super.onFailure(call, t);
activity.showSnackbar(activity.getText(R.string.connection_error).toString());
activity.progressDialog.dismiss();
}
});
}

return data from method (JSON Array)

I have one method with this url:
String url = "http://brunos.000webhostapp.com/teste/obter_id.php?descricao=" + value;
And i want to return the result of this method.
i have tried the VolleyCallback callback but i cant send the value to the method
package com.example.fabio.domoticaa;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.EditText;
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.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class Divi_Dispo extends AppCompatActivity {
String x;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_divi__dispo);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
final String[] count = new String[1];
final String[] id = new String[1];
Intent intent = getIntent();
String value = intent.getStringExtra("divisao");
final EditText nomediv = (EditText) findViewById(R.id.editText4);
Count(value);
nomediv.setText(x);//want set th result of Count(value)
}
public void Count(String value) {
final String[] count = new String[1];
// Send data
try {
RequestQueue queue = Volley.newRequestQueue(Divi_Dispo.this);
String url = "http://brunos.000webhostapp.com/teste/obter_id.php?descricao=" + value ;
JsonArrayRequest jsonRequest = new JsonArrayRequest
(Request.Method.GET, url, null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
try {
JSONObject jObj = new JSONObject(String.valueOf(response.get(0)));
count[0] = jObj.getString("COUNT(id)");//want return this valor
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
queue.add(jsonRequest);
} catch (Exception ex) {
} finally {
}
}
public interface VolleyCallback {
void onSuccess(String result);
}
}

Implementing Endless scrolling in Recycler View

I have a Recycler View which uses AsyncTask to populate UI.
Currently it retrieves all the data from the DB and displays it in one shot, but
I want to retrieve only 15 records in one go and after the scroll ends I want to load more 15 records and so on...can anybody please help. I have pasted the code below:
FeedActivity.java
package com.bbau.ankit.test_splash;
import android.app.Activity;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.Window;
import com.yqritc.recyclerviewflexibledivider.HorizontalDividerItemDecoration;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;import java.net.URL;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Ankit on 8/14/2015.
*/
public class FeedListActivity extends Activity {
private static final String TAG = "RecyclerViewExample";
private List<FeedItem> feedItemList = new ArrayList<FeedItem>();
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* Allow activity to show indeterminate progressbar */
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.news);
/* Initialize recyclerview */
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.addItemDecoration(new HorizontalDividerItemDecoration.Builder(this).color(Color.BLACK).build());
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
/*Downloading data from below url*/
final String url = "http://192.168.170.72/bbau_news.php?before=1&after=5";
new AsyncHttpTask().execute(url);
}
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
#Override
protected void onPreExecute() {
setProgressBarIndeterminateVisibility(true);
}
#Override
protected Integer doInBackground(String... params) {
InputStream inputStream = null;
Integer result = 0;
HttpURLConnection urlConnection = null;
try {
/* forming th java.net.URL object */
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
/* for Get request */
urlConnection.setRequestMethod("GET");
int statusCode = urlConnection.getResponseCode();
/* 200 represents HTTP OK */
if (statusCode == 200) {
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
}else{
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result; //"Failed to fetch data!";
}
#Override
protected void onPostExecute(Integer result) {
setProgressBarIndeterminateVisibility(false);
/* Download complete. Lets update UI */
if (result == 1) {
adapter = new MyRecyclerAdapter(FeedListActivity.this, feedItemList);
mRecyclerView.setAdapter(adapter);
} else {
Log.e(TAG, "Failed to fetch data!");
}
}
}
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("NEWS");
/*Initialize array if null*/
if (null == feedItemList) {
feedItemList = new ArrayList<FeedItem>();
}
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("news_desc"));
item.setDescription(post.optString("Date"));
item.setUrl(post.optString("News"));
feedItemList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
MyRecyclerAdapter.java
package com.bbau.ankit.test_splash;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.text.Html;
import android.text.style.AlignmentSpan;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
/**
* Created by Ankit on 8/14/2015.
*/
public class MyRecyclerAdapter extends RecyclerView.Adapter<FeedListRowHolder> {
private List<FeedItem> feedItemList;
private Context mContext;
public MyRecyclerAdapter(Context context, List<FeedItem> feedItemList) {
this.feedItemList = feedItemList;
this.mContext = context;
}
#Override
public FeedListRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, null);
FeedListRowHolder mh = new FeedListRowHolder(v);
mh.relativeLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("List Size", Integer.toString(getItemCount()));
TextView redditUrl = (TextView) v.findViewById(R.id.url);
String postUrl = redditUrl.getText().toString();
Log.d("The URL:", postUrl);
Intent intent = new Intent(mContext, WebViewActivity.class);
intent.putExtra("url", postUrl);
mContext.startActivity(intent);
}
});
return mh;
}
#Override
public void onBindViewHolder(FeedListRowHolder feedListRowHolder, int i) {
final FeedItem feedItem = feedItemList.get(i);
feedListRowHolder.title.setText(Html.fromHtml(feedItem.getTitle()));
feedListRowHolder.description.setText(feedItem.getDescription());
feedListRowHolder.url.setText(feedItem.getUrl());
}
#Override
public int getItemCount() {
return (null != feedItemList ? feedItemList.size() : 0);
}
}

Of course you can use Recycler view and EndlessScrool as a combination like this..
Here is a sample
private boolean loading = true;
int pastVisiblesItems, visibleItemCount, totalItemCount;
mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
visibleItemCount = mLayoutManager.getChildCount();
totalItemCount = mLayoutManager.getItemCount();
pastVisiblesItems = mLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ( (visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
Log.v("...", "Last Item Wow !");
}
}
}
});
Don't forget to add
LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
Here is a Github example: EndlessRecyclerOnScrollListener