Android Call State

The info about the telephony services, including the subscriber id, sim serial number, phone network type, phone state, etc., are facilitated by the android.telephony.TelephonyManager class. The TelephonyManager class of Android can also be used to get the information of the call state. The listen method of the TelephonyManager class is used to serve this purpose, by passing the PhonStateListener instance, which is necessary to implement to get the Call State, and facilitates a method onCallStateChanged().

Android Call State Example 1:

In the below example, we are demonstrating the usage of the Android TelephonyManager class to check if the phone is ringing or the phone is in a call or phone is neither ringing nor in a call.

Activity_main.xml:

In the activity_main.xml file, no new components will be added, and the code can remain as it is, except deleting the text.

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
</androidx.constraintlayout.widget.ConstraintLayout>

Activity class:(File: MainActivity.java)

In the MainActivity.java file, we will write the code to know the call state.

package com.example.appexampleapp;
 
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.Toast;
 
 
public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        TelephonyManager telephonyManager =
                (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
 
        PhoneStateListener callStateListener = new PhoneStateListener() {
            public void onCallStateChanged(int state, String incomingNumber)
            {
                if(state==TelephonyManager.CALL_STATE_RINGING){
                    Toast.makeText(getApplicationContext(),"Ringing",
                            Toast.LENGTH_LONG).show();
                }
                if(state==TelephonyManager.CALL_STATE_OFFHOOK){
                    Toast.makeText(getApplicationContext(),"Busy::Currently in another Call",
                            Toast.LENGTH_LONG).show();
                }
 
                if(state==TelephonyManager.CALL_STATE_IDLE){
                    Toast.makeText(getApplicationContext(),"Not Available:: Neither Ringing nor in a Call",
                            Toast.LENGTH_LONG).show();
                }
            }
        };
        telephonyManager.listen(callStateListener,PhoneStateListener.LISTEN_CALL_STATE);
 
    }
 
 
}

AndroidManifest.xml:

In the AndroidManifest.xml file, we will add the code to provide the READ_PHONE_STATE permission.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.appexampleapp"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk android:minSdkVersion="8"
        android:targetSdkVersion="15" />
 
    <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"
        tools:ignore="ProtectedPermissions" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
 
    <application
 
        android:label="@string/app_name" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
 
    </application>
</manifest>

Output:

Android Call State BroadCastReceiver Example

activity_main.xml:

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
 
</RelativeLayout>

Activity class:(File: MainActivity.java)

package com.example.radioapp;
 
import android.os.Bundle;
import android.app.Activity;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
 
 
}

IncomingCallReceiver:(File: IncomingCallReceiver.java)

package com.example.radioapp;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.widget.Toast;
 
 
public class IncomingCallReceiver extends BroadcastReceiver{
 
    @Override
    public void onReceive(Context context, Intent intent){
        try{
            String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
 
            if(state.equals(TelephonyManager.EXTRA_STATE_RINGING)){
                Toast.makeText(context, "Ringing", Toast.LENGTH_LONG).show();
            }
 
            if(state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)){
                Toast.makeText(context, "Call Received", Toast.LENGTH_LONG).show();
            }
 
            if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)){
                Toast.makeText(context, "Idle State", Toast.LENGTH_LONG).show();
            }
        }
        catch(Exception e){e.printStackTrace();}
    }
 
}

Android Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.radioapp">
 
    <uses-permission android:name="android.permission.READ_PHONE_NUMBERS" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <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>
        <receiver android:name=".IncomingCallReceiver">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>
    </application>
</manifest>
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