com.example.chu.googleplaylibrary.ui.BaseActivity.java Source code

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Here is the source code for com.example.chu.googleplaylibrary.ui.BaseActivity.java

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/*
 * Copyright (C) 2014 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.example.chu.googleplaylibrary.ui;

import android.content.ComponentName;
import android.os.Bundle;
import android.os.RemoteException;
import android.support.v4.media.MediaBrowserCompat;
import android.support.v4.media.session.MediaControllerCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;

import com.example.chu.googleplaylibrary.MusicService;
import com.example.chu.googleplaylibrary.utils.LogHelper;

/**
 * Base activity for activities that need to show a playback control fragment when media is playing.
 */
public abstract class BaseActivity extends ActionBarCastActivity implements MediaBrowserProvider {

    private static final String TAG = LogHelper.makeLogTag(BaseActivity.class);

    private MediaBrowserCompat mMediaBrowser;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LogHelper.d(TAG, "Activity onCreate");

        // Connect a media browser just to get the media session token. There are other ways
        // this can be done, for example by sharing the session token directly.
        mMediaBrowser = new MediaBrowserCompat(this, new ComponentName(this, MusicService.class),
                mConnectionCallback, null);
    }

    @Override
    protected void onStart() {
        super.onStart();
        LogHelper.d(TAG, "Activity onStart");

        mMediaBrowser.connect();
    }

    @Override
    protected void onStop() {
        super.onStop();
        LogHelper.d(TAG, "Activity onStop");
        mMediaBrowser.disconnect();
    }

    @Override
    public MediaBrowserCompat getMediaBrowser() {
        return mMediaBrowser;
    }

    /**
     * Check if the MediaSession is active and in a "playback-able" state
     * (not NONE and not STOPPED).
     *
     * @return true if the MediaSession's state requires playback controls to be visible.
     */
    protected boolean shouldShowControls() {
        MediaControllerCompat mediaController = getSupportMediaController();
        if (mediaController == null || mediaController.getMetadata() == null
                || mediaController.getPlaybackState() == null) {
            return false;
        }
        switch (mediaController.getPlaybackState().getState()) {
        case PlaybackStateCompat.STATE_ERROR:
        case PlaybackStateCompat.STATE_NONE:
        case PlaybackStateCompat.STATE_STOPPED:
            return false;
        default:
            return true;
        }
    }

    private void connectToSession(MediaSessionCompat.Token token) throws RemoteException {
        MediaControllerCompat mediaController = new MediaControllerCompat(this, token);
        setSupportMediaController(mediaController);

    }

    // Callback that ensures that we are showing the controls

    private final MediaBrowserCompat.ConnectionCallback mConnectionCallback = new MediaBrowserCompat.ConnectionCallback() {
        @Override
        public void onConnected() {
            LogHelper.d(TAG, "onConnected");
            try {
                connectToSession(mMediaBrowser.getSessionToken());
            } catch (RemoteException e) {
                LogHelper.e(TAG, e, "could not connect media controller");
            }
        }
    };

}