src/com/android/car/dialer/livedata/CallStateLiveData.java

/*
 * Copyright (C) 2018 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.car.dialer.livedata;

import android.telecom.Call;
import android.telecom.InCallService;

import androidx.lifecycle.LiveData;

import java.util.List;

/**
 * Represents an active phone call state.
 */
public class CallStateLiveData extends LiveData<Integer> {

    private final Call mTelecomCall;

    public CallStateLiveData(Call telecomCall) {
        mTelecomCall = telecomCall;
    }

    @Override
    protected void onActive() {
        super.onActive();

        setValue(mTelecomCall.getState());
        mTelecomCall.registerCallback(mCallback);
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        mTelecomCall.unregisterCallback(mCallback);
    }

    private Call.Callback mCallback = new Call.Callback() {
        @Override
        public void onStateChanged(Call telecomCall, int state) {
            setValue(state);
        }

        @Override
        public void onParentChanged(Call telecomCall, Call parent) {
            // no ops
        }

        @Override
        public void onCallDestroyed(Call telecomCall) {
            // no ops
        }

        @Override
        public void onDetailsChanged(Call telecomCall, Call.Details details) {
            // no ops
        }

        @Override
        public void onVideoCallChanged(Call telecomCall, InCallService.VideoCall videoCall) {
            // no ops
        }

        @Override
        public void onCannedTextResponsesLoaded(Call telecomCall,
                List<String> cannedTextResponses) {
            // no ops
        }

        @Override
        public void onChildrenChanged(Call telecomCall, List<Call> children) {
            // no ops
        }
    };
}