Hang up and reject an incoming call on user activity [button] Android

Question

Hang up and reject an incoming call on user activity [button] Android

I'm just in the process of learning Android a bit and I came across this problem.

I want to make a "custom incoming call screen". My current solution is the class (IncomingCallInterceptor), which is distributed from BroadcastReceiver. In the IncomingCallInterceptor class, I override onReceive and begin my activity (MainActivity) using the layout when the phone rings.

In this activity (MainActivity) I have three buttons: Accept a call, pause, reject a call

These buttons should do what they say, answer the phone, hang up or reject a call.

I somehow got Accept Accept to work, but not Hang Up and Decline.

Here is my code below:

manifest:

<?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, 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();

    }

}

(Layout - -, , )

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)
            }
        });
    }