Android Lab Test : Managing the telephone calls (english) Video of tutorial on : https://www.youtube.com/playlist?list=PLL2Z3bzdO25yHwIV3XdMzKs61At0Ldh6L Visit http://www.AndroidLabTest.com

1. Develop on Android
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Lesson : Telephony, calls

2. Telephony, the calls
• In this lesson, you will learn to intercept incoming calls.
• For this, you will learn to use the telephony manager
TelephonyManager.

3. Telephony, the calls
• You have to use the telephony manager with getSystemService.
TelephonyManager telephonyManager =
(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
• Register a listener PhoneStateListener.
MyPhoneStateListener myPhoneStateListener = new MyPhoneStateListener();
telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);

4. Telephony, the calls
• Manage the events (ringing, hang up, …) in the method
onCallStateChanged().
public class MyPhoneStateListener extends PhoneStateListener {
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch(state) {
case TelephonyManager.CALL_STATE_IDLE: break;
case TelephonyManager.CALL_STATE_RINGING: break;
case TelephonyManager.CALL_STATE_OFFHOOK: break;
}
}
}

5. Telephony, the calls
• When the application is interrupted (onPause() called), unregister the listening with
the event LISTEN_NONE.
public void onPause() {
telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_NONE);
}
• When the application is resumed (onResume() called), re-register the listening with
the event LISTEN_CALL_STATE.
public void onResume() {
telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}

6. Layout main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/btnCall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="doClick"
android:text="Call" />
<TextView
android:id="@+id/tv_log"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>

7. File Main.java
public class Main extends Activity {
TextView tv_log = null;
TelephonyManager telephonyManager = null;
MyPhoneStateListener myPhoneStateListener = null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv_log = (TextView)findViewById(R.id.tv_log);
Button btnCall = (Button)findViewById (R.id.btnCall);
btnCall.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("tel:010101"));
startActivity(intent);
}
});

8. File Main.java
telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
myPhoneStateListener = new MyPhoneStateListener();
}
public void onResume() {
super.onResume();
telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}
public void onPause() {
super.onPause();
telephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_NONE);
}

9. File Main.java
public class MyPhoneStateListener extends PhoneStateListener {
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch(state) {
case TelephonyManager.CALL_STATE_IDLE:
tv_log.setText("Call state idle : " + incomingNumber); break;
case TelephonyManager.CALL_STATE_RINGING:
tv_log.setText("Call state ringing : " + incomingNumber); break;
case TelephonyManager.CALL_STATE_OFFHOOK:
tv_log.setText("Call state Offhook : " + incomingNumber); break;
default:
tv_log.setText("Call state other : " + incomingNumber); break;
}
}
}
}

10. Project AndroidManifest.xml
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

11. Test on your mobile
Telephony_Calls

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Author of the first french book of development of Java mobile application (2002),
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