IT Blog Collection: How To Make A Phone Call In Android

In this tutorial, we show you how to make a phone call in Android,and monitor the phone call states viaPhoneStateListener.

P.S This project is developed in Eclipse 3.7, and tested with Android 2.3.3.

1 Android Layout Files

Simpel layout file, to display a button.

File : res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Button
        android:id="@+id/buttonCall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="call 0377778888" />
 
</LinearLayout>

2. Activity

Use below code snippet to make a phone call in Android.

 Intent callIntent = new Intent(Intent.ACTION_CALL);
 callIntent.setData(Uri.parse("tel:0377778888"));
 startActivity(callIntent);

File : MainActivity.java – When the button is call, make a phone to 0377778888.

package com.mkyong.android;
 
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class MainActivity extends Activity {
 
 private Button button;
 
 public void onCreate(Bundle savedInstanceState) {
 
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 
  button = (Button) findViewById(R.id.buttonCall);
 
  // add button listener
  button.setOnClickListener(new OnClickListener() {
 
   @Override
   public void onClick(View arg0) {
 
    Intent callIntent = new Intent(Intent.ACTION_CALL);
    callIntent.setData(Uri.parse("tel:0377778888"));
    startActivity(callIntent);
 
   }
 
  });
 
 }
 
}

3 Android Manifest

To make a phone call, Android need CALL_PHONE permission.

<uses-permission android:name="android.permission.CALL_PHONE" />

File : AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk android:minSdkVersion="10" />
 
 <uses-permission android:name="android.permission.CALL_PHONE" />
 
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
 
        <activity
            android:label="@string/app_name"
            android:name=".MainActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

4. PhoneStateListener example

Ok, now we update the above activity, to monitor the phone call states, when a phone call is ended, come back to the original activity (actually, it just restart the activity). Read comment, it should be self-explanatory.

Note
Run it and refer to the logcat console to understand how PhoneStateListener works.

File : MainActivity.java

package com.mkyong.android;
 
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class MainActivity extends Activity {
 
 final Context context = this;
 private Button button;
 
 public void onCreate(Bundle savedInstanceState) {
 
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 
  button = (Button) findViewById(R.id.buttonCall);
 
  // add PhoneStateListener
  PhoneCallListener phoneListener = new PhoneCallListener();
  TelephonyManager telephonyManager = (TelephonyManager) this
   .getSystemService(Context.TELEPHONY_SERVICE);
  telephonyManager.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
 
  // add button listener
  button.setOnClickListener(new OnClickListener() {
 
   @Override
   public void onClick(View arg0) {
 
    Intent callIntent = new Intent(Intent.ACTION_CALL);
    callIntent.setData(Uri.parse("tel:0377778888"));
    startActivity(callIntent);
 
   }
 
  });
 
 }
 
 //monitor phone call activities
 private class PhoneCallListener extends PhoneStateListener {
 
  private boolean isPhoneCalling = false;
 
  String LOG_TAG = "LOGGING 123";
 
  @Override
  public void onCallStateChanged(int state, String incomingNumber) {
 
   if (TelephonyManager.CALL_STATE_RINGING == state) {
    // phone ringing
    Log.i(LOG_TAG, "RINGING, number: " + incomingNumber);
   }
 
   if (TelephonyManager.CALL_STATE_OFFHOOK == state) {
    // active
    Log.i(LOG_TAG, "OFFHOOK");
 
    isPhoneCalling = true;
   }
 
   if (TelephonyManager.CALL_STATE_IDLE == state) {
    // run when class initial and phone call ended, 
    // need detect flag from CALL_STATE_OFFHOOK
    Log.i(LOG_TAG, "IDLE");
 
    if (isPhoneCalling) {
 
     Log.i(LOG_TAG, "restart app");
 
     // restart app
     Intent i = getBaseContext().getPackageManager()
      .getLaunchIntentForPackage(
       getBaseContext().getPackageName());
     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
     startActivity(i);
 
     isPhoneCalling = false;
    }
 
   }
  }
 }
 
}

Update Android Manifest file again, PhoneStateListener need READ_PHONE_STATE permission.

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

File : AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk android:minSdkVersion="10" />
 
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
 
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
 
        <activity
            android:label="@string/app_name"
            android:name=".MainActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>