How can I answer a phone call and hang it up?
<p>I have code which is supposed to answer the phone and hang up right away when someone calls the phone. I get no errors and no force close when the call comes in from a different phone. The problem is that it doesn't do what it is supposed to do.</p>

<p>This is the broadcaster:</p>

<pre><code>package com.QuickCallBlocking;

import java.lang.reflect.Method;


import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.TelephonyManager;

import com.android.internal.telephony.ITelephony;

public abstract class CallBlock extends BroadcastReceiver {
    private Context context;
    private ITelephony telephonyService;

    /** Called when the activity is first created. */
    public void getTeleService() {
        TelephonyManager tm = (TelephonyManager) context
        getSystemService(Context.TELEPHONY_SERVICE);

        try {
            // Java reflection to gain access to TelephonyManager's
            // ITelephony getter

            Class c = Class.forName(tm.getClass().getName());
            Method m = c.getDeclaredMethod("getITelephony");
            m.setAccessible(true);
            com.android.internal.telephony.ITelephony telephonyService = (ITelephony) m.invoke(tm);
        } catch (Exception e) {
            e.printStackTrace();
        }

        telephonyService.endCall();
    }

    String[] blockedNumbers = {"+911234567")};
    String incommingNumber;

    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle b = intent.getExtras();
        incommingNumber = b.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
        // Additional Step
        // Check whether this number matches with your defined Block List
        // If yes, Reject the Call
    }    
}
</code></pre>

<p>This is the <code>com.android.internal.telephony.ITelephony</code></p>

<pre><code>/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.telephony;

import android.os.Bundle;
import java.util.List;
//import android.telephony.NeighboringCellInfo;

/**
 * Interface used to interact with the phone.  Mostly this is used by the
 * TelephonyManager class.  A few places are still using this directly.
 * Please clean them up if possible and use TelephonyManager insteadl.
 *
 * {@hide}
 */
public interface ITelephony {

    /**
     * Dial a number. This doesn't place the call. It displays
     * the Dialer screen.
     * @param number the number to be dialed. If null, this
     * would display the Dialer screen with no number pre-filled.
     */
    void dial(String number);

    /**
     * Place a call to the specified number.
     * @param number the number to be called.
     */
    void call(String number);

    /**
     * If there is currently a call in progress, show the call screen.
     * The DTMF dialpad may or may not be visible initially, depending on
     * whether it was up when the user last exited the InCallScreen.
     *
     * @return true if the call screen was shown.
     */
    boolean showCallScreen();

    /**
     * Variation of showCallScreen() that also specifies whether the
     * DTMF dialpad should be initially visible when the InCallScreen
     * comes up.
     *
     * @param showDialpad if true, make the dialpad visible initially,
     *                    otherwise hide the dialpad initially.
     * @return true if the call screen was shown.
     *
     * @see showCallScreen
     */
    boolean showCallScreenWithDialpad(boolean showDialpad);

    /**
     * End call or go to the Home screen
     *
     * @return whether it hung up
     */
    boolean endCall();

    /**
     * Answer the currently-ringing call.
     *
     * If there's already a current active call, that call will be
     * automatically put on hold.  If both lines are currently in use, the
     * current active call will be ended.
     *
     * TODO: provide a flag to let the caller specify what policy to use
     * if both lines are in use.  (The current behavior is hardwired to
     * "answer incoming, end ongoing", which is how the CALL button
     * is specced to behave.)
     *
     * TODO: this should be a oneway call (especially since it's called
     * directly from the key queue thread).
     */
    void answerRingingCall();

    /**
     * Silence the ringer if an incoming call is currently ringing.
     * (If vibrating, stop the vibrator also.)
     *
     * It's safe to call this if the ringer has already been silenced, or
     * even if there's no incoming call.  (If so, this method will do nothing.)
     *
     * TODO: this should be a oneway call too (see above).
     *       (Actually *all* the methods here that return void can
     *       probably be oneway.)
     */
    void silenceRinger();

    /**
     * Check if we are in either an active or holding call
     * @return true if the phone state is OFFHOOK.
     */
    boolean isOffhook();

    /**
     * Check if an incoming phone call is ringing or call waiting.
     * @return true if the phone state is RINGING.
     */
    boolean isRinging();

    /**
     * Check if the phone is idle.
     * @return true if the phone state is IDLE.
     */
    boolean isIdle();

    /**
     * Check to see if the radio is on or not.
     * @return returns true if the radio is on.
     */
    boolean isRadioOn();

    /**
     * Check if the SIM pin lock is enabled.
     * @return true if the SIM pin lock is enabled.
     */
    boolean isSimPinEnabled();

    /**
     * Check if the SIM FDN lock is enabled.
     * @return true if the SIM FDN lock is enabled.
     */
    boolean isSimFDNEnabled();

    /**
     * Cancels the missed calls notification.
     */
    void cancelMissedCallsNotification();

    /**
     * Supply a pin to unlock the SIM.  Blocks until a result is determined.
     * @param pin The pin to check.
     * @return whether the operation was a success.
     */
    boolean supplyPin(String pin);

    /**
     * Supply a pin to unlock the SIM.  Blocks until a result is determined.
     * @param pin The pin to check.
     * @return whether the operation was a success.
     */
    boolean supplyPuk(String pin, String newPin);

    /**
     * Supply a pin2 to unlock the SIM.  Blocks until a result is determined.
     * @param pin The pin2 to check.
     * @return whether the operation was a success.
     */
    boolean supplyPin2(String pin2);

    /**
     * Check MS-ISDN field in SIM.
     * @param 
     * @return whether there is MS-ISDN field in SIM.
     */

    boolean getMsisdnavailable();
    /**
     * Handles PIN MMI commands (PIN/PIN2/PUK/PUK2), which are initiated
     * without SEND (so &lt;code&gt;dial&lt;/code&gt; is not appropriate).
     *
     * @param dialString the MMI command to be executed.
     * @return true if MMI command is executed.
     */
    boolean handlePinMmi(String dialString);

    /**
     * Toggles the radio on or off.
     */
    void toggleRadioOnOff();

    /**
     * Set the radio to on or off
     */
    boolean setRadio(boolean turnOn);

    /**
     * Request to update location information in service state
     */
    void updateServiceLocation();

    /**
     * Enable location update notifications.
     */
    void enableLocationUpdates();

    /**
     * Disable location update notifications.
     */
    void disableLocationUpdates();

    /**
     * Enable a specific APN type.
     */
    int enableApnType(String type);

    /**
     * Disable a specific APN type.
     */
    int disableApnType(String type);

    /**
     * Allow mobile data connections.
     */
    boolean enableDataConnectivity();

    /**
     * Disallow mobile data connections.
     */
    boolean disableDataConnectivity();

    /**
     * Report whether data connectivity is possible.
     */
    boolean isDataConnectivityPossible();

    Bundle getCellLocation();

    /**
     * Returns the neighboring cell information of the device.
     */
    //List&lt;NeighboringCellInfo&gt; getNeighboringCellInfo();

     int getCallState();
     int getDataActivity();
     int getDataState();

    /**
     * Returns the current active phone type as integer.
     * Returns TelephonyManager.PHONE_TYPE_CDMA if RILConstants.CDMA_PHONE
     * and TelephonyManager.PHONE_TYPE_GSM if RILConstants.GSM_PHONE
     */
    int getActivePhoneType();

    /**
     * Returns the CDMA ERI icon index to display
     */
    int getCdmaEriIconIndex();

    /**
     * Returns the CDMA ERI icon mode,
     * 0 - ON
     * 1 - FLASHING
     */
    int getCdmaEriIconMode();

    /**
     * Returns the CDMA ERI text,
     */
    String getCdmaEriText();

    /**
     * Returns true if CDMA provisioning needs to run.
     */
    boolean getCdmaNeedsProvisioning();

    /**
      * Returns the unread count of voicemails
      */
    int getVoiceMessageCount();

    /**
      * Returns the network type
      */
    int getNetworkType();

    /**
     * Return true if an ICC card is present
     */
    boolean hasIccCard();

    //[ TelephonyFeature.CONFIG_FAKECALL_FEATURE
    void initiateFakecall();
    //]

    /**
     * Returns the Value of PIN remain retry number.
     */
    int getSimPinRetry();

    /**
     * Returns the Value of PUK remain retry number.
     */
    int getSimPukRetry();

    /**
     * Switch Holding and Active
     */
    void switchHoldingAndActive();

    /**
     * Make call mute or unmute
     */
    void setMute(boolean flag);

    /**
     * Return mute state
     */
    boolean getMute();

    /**
     * Make speaker call on or off
     */
    void turnOnSpeaker(boolean flag);

    /**
     * Return Active calls count.
     */
    int getActiveCallsCount();

    /**
     * Return Hold calls count.
     */
    int getHoldCallsCount();

    /**
     * Return Caller name
     * First active call has priority
     */
    String getCallerName();

    /**
     * Return Call time
     * First active call has priority
     */
    long getCallTime();

    /**
     * Return Call base time
     * First active call has priority
     */
    long getCallBaseTime();

    /**
     * Return TRUE, if current call is video call
     * First active call has priority
     */
    boolean isVideoCall();

    // [TelephonyFeature.CONFIG_MULTIPLE_PDP_FEATURE
    boolean getDataStatebyApnType(String ApnType);
    // ]
   }
</code></pre>

<p>P.S This is some one else's work from this site: <a href="http://prasanta-paul.blogspot.com/2010/09/call-control-in-android.html" rel="nofollow">Prasanta's Blog</a></p>
