1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.media; 17 18 import static android.media.VolumeProvider2.VOLUME_CONTROL_ABSOLUTE; 19 import static android.media.VolumeProvider2.VOLUME_CONTROL_FIXED; 20 import static android.media.VolumeProvider2.VOLUME_CONTROL_RELATIVE; 21 22 import android.media.VolumeProvider2; 23 import android.media.update.VolumeProvider2Provider; 24 25 public class VolumeProvider2Impl implements VolumeProvider2Provider { 26 private final VolumeProvider2 mInstance; 27 private final int mControlType; 28 private final int mMaxVolume; 29 30 private int mCurrentVolume; 31 private Callback mCallback; 32 VolumeProvider2Impl(VolumeProvider2 instance, @VolumeProvider2.ControlType int controlType, int maxVolume, int currentVolume)33 public VolumeProvider2Impl(VolumeProvider2 instance, 34 @VolumeProvider2.ControlType int controlType, int maxVolume, int currentVolume) { 35 if (controlType != VOLUME_CONTROL_FIXED && controlType != VOLUME_CONTROL_RELATIVE 36 && controlType != VOLUME_CONTROL_ABSOLUTE) { 37 throw new IllegalArgumentException("wrong controlType " + controlType); 38 } 39 if (maxVolume < 0 || currentVolume < 0) { 40 throw new IllegalArgumentException("volume shouldn't be negative" 41 + ", maxVolume=" + maxVolume + ", currentVolume=" + currentVolume); 42 } 43 if (currentVolume > maxVolume) { 44 throw new IllegalArgumentException("currentVolume shouldn't be greater than maxVolume" 45 + ", maxVolume=" + maxVolume + ", currentVolume=" + currentVolume); 46 } 47 mInstance = instance; 48 mControlType = controlType; 49 mMaxVolume = maxVolume; 50 mCurrentVolume = currentVolume; 51 } 52 53 @Override getControlType_impl()54 public int getControlType_impl() { 55 return mControlType; 56 } 57 58 @Override getMaxVolume_impl()59 public int getMaxVolume_impl() { 60 return mMaxVolume; 61 } 62 63 @Override getCurrentVolume_impl()64 public int getCurrentVolume_impl() { 65 return mCurrentVolume; 66 } 67 68 @Override setCurrentVolume_impl(int currentVolume)69 public void setCurrentVolume_impl(int currentVolume) { 70 if (currentVolume < 0) { 71 throw new IllegalArgumentException("currentVolume shouldn't be negative" 72 + ", currentVolume=" + currentVolume); 73 } 74 mCurrentVolume = currentVolume; 75 if (mCallback != null) { 76 mCallback.onVolumeChanged(mInstance); 77 } 78 } 79 80 /** 81 * Sets a callback to receive volume changes. 82 */ setCallback(Callback callback)83 public void setCallback(Callback callback) { 84 mCallback = callback; 85 } 86 87 /** 88 * Listens for changes to the volume. 89 */ 90 public static abstract class Callback { onVolumeChanged(VolumeProvider2 volumeProvider)91 public abstract void onVolumeChanged(VolumeProvider2 volumeProvider); 92 } 93 } 94