| /* |
| * Copyright 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.media.common.source; |
| |
| import android.annotation.NonNull; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.support.v4.media.MediaBrowserCompat; |
| |
| import androidx.annotation.IntDef; |
| import androidx.annotation.VisibleForTesting; |
| import androidx.lifecycle.LiveData; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| |
| /** |
| * A LiveData that emits a MediaBrowserState for the current connection status. Attempts to maintain |
| * a connection while active. |
| */ |
| |
| class MediaBrowserConnector extends LiveData<MediaBrowserConnector.MediaBrowserState> { |
| |
| /** |
| * Contains the {@link MediaBrowserCompat} for a {@link MediaBrowserConnector} and its |
| * associated connection status. |
| */ |
| public static class MediaBrowserState { |
| public final MediaBrowserCompat mMediaBrowser; |
| |
| @ConnectionState |
| public final int mConnectionState; |
| |
| MediaBrowserState(MediaBrowserCompat mediaBrowser, @ConnectionState int connectionState) { |
| mMediaBrowser = mediaBrowser; |
| mConnectionState = connectionState; |
| } |
| } |
| |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef(value = {ConnectionState.DISCONNECTED, ConnectionState.CONNECTING, |
| ConnectionState.CONNECTED, ConnectionState.CONNECTION_FAILED}) |
| public @interface ConnectionState { |
| int DISCONNECTED = 0; |
| int CONNECTING = 1; |
| int CONNECTED = 2; |
| int CONNECTION_FAILED = 3; |
| } |
| |
| private final MediaBrowserCompat mBrowser; |
| |
| /** |
| * Create a new MediaBrowserConnector for the specified component. |
| * |
| * @param context The Context with which to build the MediaBrowser. |
| * @param browseService The ComponentName of the media browser service. |
| * @see MediaBrowserCompat#MediaBrowserCompat(Context, ComponentName, |
| * MediaBrowserCompat.ConnectionCallback, android.os.Bundle) |
| */ |
| MediaBrowserConnector(@NonNull Context context, |
| @NonNull ComponentName browseService) { |
| mBrowser = createMediaBrowser(context, browseService, |
| new MediaBrowserCompat.ConnectionCallback() { |
| @Override |
| public void onConnected() { |
| setValue(new MediaBrowserState(mBrowser, ConnectionState.CONNECTED)); |
| } |
| |
| @Override |
| public void onConnectionFailed() { |
| setValue( |
| new MediaBrowserState(mBrowser, ConnectionState.CONNECTION_FAILED)); |
| } |
| |
| @Override |
| public void onConnectionSuspended() { |
| setValue(new MediaBrowserState(mBrowser, ConnectionState.DISCONNECTED)); |
| } |
| }); |
| } |
| |
| /** |
| * Instantiate the MediaBrowserCompat this MediaBrowserConnector will connect with. |
| */ |
| @VisibleForTesting() |
| protected MediaBrowserCompat createMediaBrowser(@NonNull Context context, |
| @NonNull ComponentName browseService, |
| @NonNull MediaBrowserCompat.ConnectionCallback callback) { |
| return new MediaBrowserCompat(context, browseService, callback, null); |
| } |
| |
| @Override |
| protected void onActive() { |
| super.onActive(); |
| if (mBrowser.isConnected()) { |
| setValue(new MediaBrowserState(mBrowser, ConnectionState.CONNECTED)); |
| } else { |
| try { |
| connect(); |
| } catch (IllegalStateException ex) { |
| // Ignore: MediaBrowse could be in an intermediate state (not connected, but not |
| // disconnected either.). In this situation, trying to connect again can throw |
| // this exception, but there is no way to know without trying. |
| } |
| } |
| } |
| |
| private void connect() { |
| setValue(new MediaBrowserState(mBrowser, ConnectionState.CONNECTING)); |
| mBrowser.connect(); |
| } |
| |
| @Override |
| protected void onInactive() { |
| // TODO(b/77640010): Review MediaBrowse disconnection. |
| // Some media sources are not responding correctly to MediaBrowser#disconnect(). We |
| // are keeping the connection going. |
| // mBrowser.disconnect(); |
| } |
| } |