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// Menifest
<uses-feature android:name="android.hardware.Sensor.proximity"
        android:required="true"/>
        
        //java
        
        
        public class MainActivity extends AppCompatActivity {

    Sensor proximitySensor;

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//Json
Download from firebase and link

//Java.................

MyFirebaseInstanceIdService.java

public class MyFirebaseInstanceIdService extends FirebaseInstanceIdService {

    @Override

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// XML................

<?xml version="1.0" encoding="utf-8"?>


<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    xmlns:ads="http://schemas.android.com/apk/res-auto">

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public class Web extends AppCompatActivity {
    private WebView webview;
    private ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.web_view);

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private void sendMail() {
        String recipientList = "admin@sikhismknowledge.com";
        String[] recipients = recipientList.split(",");


        String subject = mEditTextSubject.getText().toString();
        String message = mEditTextMessage.getText().toString();

        Intent sendIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
                "mailto","admin@sikhismknowledge.com", null));

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public class welcomeScreen extends AppCompatActivity {
    private static int SPLASH_TIME_OUT = 1500;
    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.welcome_screen);


        new Handler().postDelayed(new Runnable(){
            @Override