src/com/android/phone/CallForwardType.java

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package com.android.phone;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.telephony.CarrierConfigManager;
import android.telephony.ims.ImsMmTelManager;
import android.telephony.ims.feature.ImsFeature;
import android.telephony.ims.feature.MmTelFeature;
import android.telephony.SubscriptionManager;
import android.util.Log;
import android.view.MenuItem;

import com.android.ims.FeatureConnector;
import com.android.ims.ImsException;
import com.android.ims.ImsManager;
import com.android.internal.telephony.CommandsInterface;
import com.android.internal.telephony.IccCardConstants;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.TelephonyIntents;
import android.preference.Preference.OnPreferenceClickListener;

public class CallForwardType extends PreferenceActivity {
    private static final String LOG_TAG = "CallForwardType";
    private final boolean DBG = (PhoneGlobals.DBG_LEVEL >= 2);

    private static final String BUTTON_CF_KEY_VOICE = "button_cf_key_voice";
    private static final String BUTTON_CF_KEY_VIDEO = "button_cf_key_video";

    private Preference mVoicePreference;
    private Preference mVideoPreference;
    private Phone mPhone;
    private SubscriptionInfoHelper mSubscriptionInfoHelper;
    private boolean mIsUtCapable = false;
    private boolean mIsVtCapable = false;
    boolean mHideVtCfOption = false;
    private FeatureConnector<ImsManager> mFeatureConnector;
    private int mPhoneId;
    private IntentFilter mIntentFilter;

     private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             Log.d(LOG_TAG, "onReceive intent : " + intent);
                 int phoneId = intent.getIntExtra(PhoneConstants.PHONE_KEY,
                         SubscriptionManager.INVALID_PHONE_INDEX);
             if (TelephonyIntents.ACTION_SIM_STATE_CHANGED.equals(intent.getAction())) {
                 if (phoneId == mPhoneId &&
                         IccCardConstants.INTENT_VALUE_ICC_ABSENT.equals(
                             intent.getStringExtra(IccCardConstants.INTENT_KEY_ICC_STATE))) {
                     Log.d(LOG_TAG, "onSimAbsent, exit");
                     finish();
                 }
             }
         }
     };

    private ImsMmTelManager.CapabilityCallback mCapabilityCallback =
        new ImsMmTelManager.CapabilityCallback() {
            @Override
            public void onCapabilitiesStatusChanged(MmTelFeature.MmTelCapabilities capabilities) {
                    boolean isUtCapable = capabilities.isCapable(
                            MmTelFeature.MmTelCapabilities.CAPABILITY_TYPE_UT);
                    boolean isVtCapable = capabilities.isCapable(
                            MmTelFeature.MmTelCapabilities.CAPABILITY_TYPE_VIDEO);
                    if (isUtCapable ==  mIsUtCapable && isVtCapable == mIsVtCapable) {
                        return;
                    }
                    mIsUtCapable = isUtCapable;
                    mIsVtCapable = isVtCapable;
                    showVideoOption(mIsUtCapable && mIsVtCapable && !mHideVtCfOption);
            }
    };

    private void setListeners() throws ImsException {
        ImsManager imsMgr = ImsManager.getInstance(mPhone.getContext(), mPhone.getPhoneId());
        imsMgr.addCapabilitiesCallback(mCapabilityCallback);
    }

    private void removeListeners() {
        ImsManager imsMgr = ImsManager.getInstance(mPhone.getContext(), mPhone.getPhoneId());
        try {
            imsMgr.removeCapabilitiesCallback(mCapabilityCallback);
        } catch (ImsException e) {
            Log.d(LOG_TAG, "unable to remove callback.");
        }
    }

    private void showVideoOption(boolean show) {
        if (!show){
            Log.d(LOG_TAG, "remove video option");
            getPreferenceScreen().removePreference(mVideoPreference);
        } else {
            Log.d(LOG_TAG, "enable video option");
            getPreferenceScreen().addPreference(mVideoPreference);
        }
    }
    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        Log.d(LOG_TAG, "onCreate..");
        /*Loading CallForward Setting page*/
        addPreferencesFromResource(R.xml.call_forward_type);
        mSubscriptionInfoHelper = new SubscriptionInfoHelper(this, getIntent());
        mPhone = mSubscriptionInfoHelper.getPhone();
        mPhoneId = mPhone.getPhoneId();
        mIsUtCapable = mPhone.isUtEnabled();
        mIsVtCapable = mPhone.isVideoEnabled();
        mFeatureConnector = new FeatureConnector(mPhone.getContext(), mPhone.getPhoneId(),
                new FeatureConnector.Listener<ImsManager>() {
                    @Override
                    public ImsManager getFeatureManager() {
                        return ImsManager.getInstance(mPhone.getContext(), mPhone.getPhoneId());
                    }

                    @Override
                    public void connectionReady(ImsManager manager) throws ImsException {
                        Log.d(LOG_TAG, "ImsManager: connection ready.");
                        setListeners();
                    }

                    @Override
                    public void connectionUnavailable() {
                        Log.d(LOG_TAG, "ImsManager: connection unavailable.");
                        removeListeners();
                    }
                }, LOG_TAG);

        /*Voice Button*/
        mVoicePreference = (Preference) findPreference(BUTTON_CF_KEY_VOICE);
        mVoicePreference.setOnPreferenceClickListener(new OnPreferenceClickListener() {

            /*onClicking Voice Button*/
            public boolean onPreferenceClick(Preference pref) {
                Intent intent = mSubscriptionInfoHelper.getIntent(GsmUmtsCallForwardOptions.class);
                Log.d(LOG_TAG, "Voice button clicked!");
                intent.putExtra(PhoneUtils.SERVICE_CLASS,
                        CommandsInterface.SERVICE_CLASS_VOICE);
                startActivity(intent);
                return true;
            }
        });

         /*Video Button*/
         mVideoPreference = (Preference) findPreference(BUTTON_CF_KEY_VIDEO);
         mVideoPreference.setOnPreferenceClickListener(new OnPreferenceClickListener() {

             /*onClicking Video Button*/
             public boolean onPreferenceClick(Preference pref) {
                Intent intent = mSubscriptionInfoHelper.getIntent(GsmUmtsCallForwardOptions.class);
                Log.d(LOG_TAG, "Video button clicked!");
                intent.putExtra(PhoneUtils.SERVICE_CLASS,
                       (CommandsInterface.SERVICE_CLASS_DATA_SYNC +
                        CommandsInterface.SERVICE_CLASS_PACKET));
                startActivity(intent);
                return true;
             }
        });
        mIntentFilter = new IntentFilter();
        mIntentFilter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED);
        CarrierConfigManager cfgManager = (CarrierConfigManager)
                mPhone.getContext().getSystemService(Context.CARRIER_CONFIG_SERVICE);
        if (cfgManager != null) {
            mHideVtCfOption = cfgManager.getConfigForSubId(mPhone.getSubId())
                .getBoolean("config_hide_vt_callforward_option");
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(mBroadcastReceiver, mIntentFilter);
        mFeatureConnector.connect();

        if (mHideVtCfOption || !(mPhone.isUtEnabled() && mPhone.isVideoEnabled())) {
            Log.d(LOG_TAG, "VT or/and Ut Service is not enabled");
            showVideoOption(false);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        mFeatureConnector.disconnect();
        unregisterReceiver(mBroadcastReceiver);
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        final int itemId = item.getItemId();
        if (itemId == android.R.id.home) {
            onBackPressed();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}