BatteryMonitor.java

/*
 * Copyright (C) 2015 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.talkback;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.telephony.TelephonyManager;
/**
 * Monitor battery charging status changes.
 * Start charging
 * Stop changing
 */
public class BatteryMonitor extends BroadcastReceiver {
    private SpeechController mSpeechController;

    private TelephonyManager mTelephonyManager;

    private Context mContext;

    private int mBatteryLevel = 0;

    public BatteryMonitor(Context context,
                          SpeechController speechController,
                          TelephonyManager telephonyManager) {
        if (speechController == null) throw new IllegalStateException();

        mContext = context;
        mSpeechController = speechController;
        mTelephonyManager = telephonyManager;
    }

    public IntentFilter getFilter() {
        final IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        intentFilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
        intentFilter.addAction(Intent.ACTION_POWER_CONNECTED);
        return intentFilter;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if ((mTelephonyManager != null)
                && (mTelephonyManager.getCallState() != TelephonyManager.CALL_STATE_IDLE)) {
            return;
        }
        final String action = intent.getAction();
        if (action == null) {
            return;
        }

        String announcement = null;
        switch (action) {
            case Intent.ACTION_BATTERY_CHANGED:
                int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
                int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
                mBatteryLevel = (scale != 0 ? Math.round(level / (float) scale * 100) : 0);
                break;
            case Intent.ACTION_POWER_DISCONNECTED:
                announcement = mContext.getString(R.string.template_charging,
                        mContext.getString(R.string.notification_type_status_stopped),
                        String.valueOf(mBatteryLevel));
                break;
            case Intent.ACTION_POWER_CONNECTED:
                announcement = mContext.getString(R.string.template_charging,
                        mContext.getString(R.string.notification_type_status_started),
                        String.valueOf(mBatteryLevel));
                break;
        }
        if (announcement != null) {
            mSpeechController.speak(announcement,
                    SpeechController.QUEUE_MODE_INTERRUPT,
                    FeedbackItem.FLAG_NO_HISTORY, null);
        }
    }
}