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Activity2.java

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package com.mycaptain.fun;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;

import android.view.View;

import android.net.Uri;

import android.widget.ImageButton;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import android.os.Bundle;

public class Activity2 extends AppCompatActivity {

EditText call_et;

ImageButton call_bt;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main2);

call_et = findViewById(R.id.call_func);

call_bt = findViewById(R.id.call_bt);

call_bt.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String phone = call_et.getText().toString();

if(phone.isEmpty()) {

Toast.makeText(getApplicationContext(), "Please Enter Number !"

, Toast.LENGTH_SHORT).show();

}

else {

String s = "tel:" + phone;

Intent intent = new Intent(Intent.ACTION_CALL);

intent.setData(Uri.parse(s));

startActivity(intent);

}

}

});

}

}