Android

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_UPDATES"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.example.work.try1;

import android.widget.Button;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.net.Uri;
import android.content.Intent;
import android.view.View;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Launch extends AppCompatActivity {

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

        final View buttonS = findViewById(R.id.button);
        buttonS.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Uri uri = Uri.parse("https://www.navanithiastrolife.com");
                Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                startActivity(intent);
            }
        });

        Button b = (Button) findViewById(R.id.button2);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                EditText e1 = (EditText) findViewById(R.id.editText);
                String username = e1.getText().toString();
                EditText e2 = (EditText) findViewById(R.id.editText3);
                String password = e2.getText().toString();

                OutputStream out = null;
                try {

                    URL url = new URL("http://iconinfo.tech/mob_app/");

                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

                    urlConnection.connect();

                    urlConnection.setRequestMethod("POST");
                    urlConnection.setRequestProperty("username",username);
                    urlConnection.setRequestProperty("password",password);
                    urlConnection.setDoOutput(true);

                    urlConnection.disconnect();

                } catch (Exception e) {
                    System.out.println(e.getMessage());
                }
            }
        });
    }
}

btn_contact_save.Click += (sender, e) =>
            {
                var progressDialog = new ProgressDialog(Context);
                progressDialog.SetTitle("Saving...");
                progressDialog.Indeterminate = true;
                progressDialog.Show();
                progressDialog.SetCancelable(false);

<pre>
             btn_details_save_Click(view);

            progressDialog.Dismiss();

        };</pre>

<pre>Intent homemap = new Intent(this, typeof(HomeMap));
    var  fintent = new Intent(this, homemap.Class);
    StartActivity(fintent);</pre>

<pre><activity
        android:name=".Toletsa.HomeMap"
        android:label="@string/title_activity_maps" /></pre> 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_privacy_policy"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    tools:context="com.vimalsoft.toletsa.Toletsa.HomeMap">
  <fragment
      android:id="@+id/map"
      android:layout_width="200dp"
      android:layout_height="200dp"
      class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>