The phone dialer is an activity available with the Android operating system to call a number. Usually, such activity may or may not have an EditText, for taking the number as input, and a Call button. When the user presses the Call button, it invokes the dialer app activity. Use of ‘tel:’ prefix is recommended, else java.lang.IllegalStateException will be thrown. Action_Dial doesn’t require any permission. Below is the code for MainActivity file in both Java and Kotlin.
Java
package com.neveropen.gfg.dial; // importing packagesimport android.content.Intent;import android.net.Uri;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.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Binding MainActivity.java with // activity_main.xml file setContentView(R.layout.activity_main); } // This function is called when button is clicked. public void Call(View v) { // Find the EditText by its unique ID EditText e = (EditText)findViewById(R.id.editText); // show() method display the toast with message // "clicked" Toast.makeText(this, "clicked", Toast.LENGTH_LONG) .show(); // Use format with "tel:" and phoneNumber created is // stored in u. Uri u = Uri.parse("tel:" + e.getText().toString()); // Create the intent and set the data for the // intent as the phone number. Intent i = new Intent(Intent.ACTION_DIAL, u); try { // Launch the Phone app's dialer with a phone // number to dial a call. startActivity(i); } catch (SecurityException s) { // show() method display the toast with // exception message. Toast.makeText(this, "An error occurred", Toast.LENGTH_LONG) .show(); } }} |
Kotlin
package com.neveropen.gfg.dial import android.content.Intentimport android.net.Uriimport android.os.Bundleimport android.view.Viewimport android.widget.EditTextimport android.widget.Toastimport androidx.appcompat.app.AppCompatActivityimport com.example.gfgreviewinjava.R class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) // Binding MainActivity.java with // activity_main.xml file setContentView(R.layout.activity_main) } // This function is called when button is clicked. fun Call(v: View?) { // Find the EditText by its unique ID val e = findViewById<View>(R.id.editText) as EditText // show() method display the toast with message // "clicked" Toast.makeText(this, "clicked", Toast.LENGTH_LONG) .show() // Use format with "tel:" and phoneNumber created is // stored in u. val u = Uri.parse("tel:" + e.text.toString()) // Create the intent and set the data for the // intent as the phone number. val i = Intent(Intent.ACTION_DIAL, u) try { // Launch the Phone app's dialer with a phone // number to dial a call. startActivity(i) } catch (s: SecurityException) { // show() method display the toast with // exception message. Toast.makeText(this, "An error occurred", Toast.LENGTH_LONG) .show() } }} |
In order to make a direct call without switching into dialer activity, you need to add Intent.ACTION_CALL in place of Intent.ACTION_DIAL.
activity_main.xml
XML
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout <!-- covers entire width of the screen --> android:layout_width="match_parent" <!-- covers entire height of the screen --> android:layout_height="match_parent" tools:context="com.example.hp.dial.MainActivity"> <EditText android:id="@+id/editText" <!-- covers as much width as required. --> android:layout_width="wrap_content" <!-- covers as much height as required. --> android:layout_height="wrap_content" <!-- left spacing from the parent layout--> android:layout_marginLeft="8dp" <!-- right spacing from the parent layout--> android:layout_marginRight="8dp" <!-- top spacing from the parent layout--> android:layout_marginTop="65dp" <!-- hint works as a place holder --> android:hint="Phone No." <!-- Expressing the given input should be phone no --> android:inputType="phone" app:layout_constraintHorizontal_bias="0.503" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> <Button android:id="@+id/button" <!-- covers as much width as required. --> android:layout_width="wrap_content" <!-- covers as much height as required. --> android:layout_height="wrap_content" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginTop="67dp" <!-- name of function is Call, and it is --> <!-- invoked when the button is clicked.--> android:onClick="Call" android:text="DIAL" <!-- below are the positions of the button --> <!-- with respect to editText and parent layout. --> app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/editText" /></android.support.constraint.ConstraintLayout> |
In AndroidManifest.xml, include the below permission to directly call without opening in a dialer. To make a call through open in a dialer, below permission is not needed.
uses-permission android:name="android.permission.CALL_PHONE"
Figure 1. Enter Phone no.
Figure 2. Open the dialer activity.