63 lines
2.1 KiB
Java
63 lines
2.1 KiB
Java
/*
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* Copyright (c) 2019 Hemanth Savarala.
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*
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* Licensed under the GNU General Public License v3
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*
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* This is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by
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* the Free Software Foundation either version 3 of the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*/
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package code.name.monkey.retromusic.volume;
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import android.database.ContentObserver;
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import android.media.AudioManager;
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import android.net.Uri;
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import android.os.Handler;
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import androidx.annotation.NonNull;
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public class AudioVolumeContentObserver extends ContentObserver {
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private final OnAudioVolumeChangedListener mListener;
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private final AudioManager mAudioManager;
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private final int mAudioStreamType;
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private float mLastVolume;
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AudioVolumeContentObserver(@NonNull Handler handler, @NonNull AudioManager audioManager,
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int audioStreamType,
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@NonNull OnAudioVolumeChangedListener listener) {
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super(handler);
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mAudioManager = audioManager;
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mAudioStreamType = audioStreamType;
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mListener = listener;
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mLastVolume = audioManager.getStreamVolume(mAudioStreamType);
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}
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/**
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* Depending on the handler this method may be executed on the UI thread
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*/
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@Override
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public void onChange(boolean selfChange, Uri uri) {
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if (mAudioManager != null && mListener != null) {
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float maxVolume = mAudioManager.getStreamMaxVolume(mAudioStreamType);
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float currentVolume = mAudioManager.getStreamVolume(mAudioStreamType);
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if (currentVolume != mLastVolume) {
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mLastVolume = currentVolume;
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mListener.onAudioVolumeChanged(currentVolume, maxVolume);
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}
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}
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}
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@Override
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public boolean deliverSelfNotifications() {
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return super.deliverSelfNotifications();
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}
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} |