Java – Hang up and reject incoming calls via custom activities [button] Android

I

just started learning Android and I stumbled upon this issue.

I want to do a “custom call screen”. My current solution is a class extended from BroadcastReceiver (IncomingCallInterceptor). In the IncomingCallInterceptor class, I override onReceive and start my activity (MainActivity) with layout when the phone rings.

In this activity, I have three buttons:
Answer, hang up, reject calls

These buttons should do what they say, answer, hang up, or decline.

I somehow got answering the call to work, but didn’t hang up and refuse.

Here’s my code:

list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.uppgift.six.one.incoming61.sixone" >

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

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

<receiver android:name="IncomingCallInterceptor">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE"/>
            </intent-filter>
        </receiver>
        <activity
            android:name=". MainActivity"
            android:label="@string/app_name" >
        </activity>
    </application>
</manifest>

IncomingCallInterceptor: extended from BroadcastReceiver

public class IncomingCallInterceptor extends BroadcastReceiver {

@Override
    public void onReceive(Context context, Intent intent) {
        Context appContext = context.getApplicationContext();
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        String msg = "Phone state changed to " + state;

if (TelephonyManager.EXTRA_STATE_RINGING.equals(state)) {
            String incomingNumber = intent.getStringExtra
                    (TelephonyManager.EXTRA_INCOMING_NUMBER);
            msg += ". Incoming number is this " + incomingNumber;

START MY ACTIVITY!
            Intent i = new Intent(appContext, MainActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            appContext.startActivity(i);
        }
        Toast.makeText(context, msg, Toast.LENGTH_LONG).show();

}

}

Here’s my Activity (there’s nothing to post in Layout, it’s basically three buttons).

public class MainActivity extends ActionBarActivity {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

Button btnAnswer = (Button)findViewById(R.id.btnAnswer);
        Button btnDecline= (Button)findViewById(R.id.btnDecline);
        Button btnHangUp= (Button)findViewById(R.id.btnHangUp);

btnAnswer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(Intent.ACTION_MEDIA_BUTTON);
                i.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_UP,
                        KeyEvent.KEYCODE_HEADSETHOOK));
                sendOrderedBroadcast(i, null);
            }
        });

btnDecline.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Decline Call (I need help here)
            }
        });

btnHangUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Hang Up Call (I need help here)
            }
        });
    }

In the MainActivity class, it’s marked with comments where I need help.
I also saw some information about the Interfacey solution, but I didn’t understand how it worked when I tested it.

Reject an incoming call:

 try {

TelephonyManager tm = (TelephonyManager)
                        getSystemService(Context.TELEPHONY_SERVICE);
                try {
                    Class c = Class.forName(tm.getClass().getName());
                    Method m = c.getDeclaredMethod("getITelephony");
                    m.setAccessible(true);
                    Object telephonyService = m.invoke(tm);  Get the internal ITelephony object
                    c = Class.forName(telephonyService.getClass().getName());  Get its class
                    m = c.getDeclaredMethod("endCall");  Get the "endCall()" method
                    m.setAccessible(true);  Make it accessible
                    m.invoke(telephonyService);  invoke endCall()

} catch (Exception e) {
                    e.printStackTrace();
                }

} catch (Exception e) {

}
        }