Android TV开发总结（六）构建一个TV app的直播节目

近年来，Android TV的迅速发展，传统的有线电视受到较大的冲击，在TV上用户同样也可以看到各个有线电视的直播频道，相对于手机，这种直播节目，体验效果更佳，尤其是一样赛事节目，大屏幕看得才够痛快，还可以邀几好友一起欣赏。今天将介绍构建一个TV app的直播节目实例,此实例上传到Github: https://github.com/hejunlin2013/LivePlayback 喜欢可以star。Agenda如下：

• 效果图
• 代码实现：
• 主页面：Recycleview对应Adapater
• 直播节目源
• 播放器
• 播放页处理
• 播放页的播放panel:

先看下效果图:主界面： 这里写图片描述 这里写图片描述 CCTV-1: 这里写图片描述 湖南卫视： 这里写图片描述 CCTV-第一剧场： 这里写图片描述 CCTV-15（音乐）： 这里写图片描述 CCTV-14（少儿）： 这里写图片描述 CCTV-13（新闻）： 这里写图片描述 CCTV-12（社会与法）： 这里写图片描述 CCTV-11（戏曲）： 这里写图片描述 CCTV-10（科教）： 这里写图片描述 CCTV-9（纪录）： 这里写图片描述 CCTV-8（电视剧）： 这里写图片描述 CCTV-第一剧场： 这里写图片描述 CCTV-15: 这里写图片描述

代码实现：

• 主页面：Recycleview对应adapater
• 直播节目源
• 播放器
• 播放页处理主页面：

/*
 * Copyright (C) 2016 hejunlin <hejunlin2013@gmail.com>
 * 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.
 */
public class MainActivity extends Activity {

    private MetroViewBorderImpl mMetroViewBorderImpl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mMetroViewBorderImpl = new MetroViewBorderImpl(this);
        mMetroViewBorderImpl.setBackgroundResource(R.drawable.border_color);
        loadRecyclerViewMenuItem();
    }

    private void loadRecyclerViewMenuItem() {
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.ry_menu_item);
        GridLayoutManager layoutManager = new GridLayoutManager(this, 1);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setFocusable(false);
        mMetroViewBorderImpl.attachTo(recyclerView);
        createOptionItemData(recyclerView, R.layout.detail_menu_item);
    }

    private void createOptionItemData(RecyclerView recyclerView, int id) {
        OptionItemAdapter adapter = new OptionItemAdapter(this, id);
        recyclerView.setAdapter(adapter);
        recyclerView.scrollToPosition(0);
    }
}

播放页：

/*
 * Copyright (C) 2016 hejunlin <hejunlin2013@gmail.com>
 * 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.
 */
public class LiveActivity extends Activity {

    private IjkVideoView mVideoView;
    private RelativeLayout mVideoViewLayout;
    private RelativeLayout mLoadingLayout;
    private TextView mLoadingText;
    private TextView mTextClock;
    private String mVideoUrl = "";
    private int mRetryTimes = 0;
    private static final int CONNECTION_TIMES = 5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_live);
        mVideoUrl = getIntent().getStringExtra("url");
        mVideoView = (IjkVideoView) findViewById(R.id.videoview);
        mVideoViewLayout = (RelativeLayout) findViewById(R.id.fl_videoview);
        mLoadingLayout = (RelativeLayout) findViewById(R.id.rl_loading);
        mLoadingText = (TextView) findViewById(R.id.tv_load_msg);
        mTextClock = (TextView)findViewById(R.id.tv_time);
        mTextClock.setText(getDateFormate());
        mLoadingText.setText("节目加载中...");
        initVideo();
    }

    private String getDateFormate(){
        Calendar c = Calendar.getInstance();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String formattedDate = df.format(c.getTime());
        return formattedDate;
    }

    public void initVideo() {
        // init player
        IjkMediaPlayer.loadLibrariesOnce(null);
        IjkMediaPlayer.native_profileBegin("libijkplayer.so");
        mVideoView.setVideoURI(Uri.parse(mVideoUrl));
        mVideoView.setOnPreparedListener(new IMediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(IMediaPlayer mp) {
                mVideoView.start();
            }
        });

        mVideoView.setOnInfoListener(new IMediaPlayer.OnInfoListener() {
            @Override
            public boolean onInfo(IMediaPlayer mp, int what, int extra) {
                switch (what) {
                    case IjkMediaPlayer.MEDIA_INFO_BUFFERING_START:
                        mLoadingLayout.setVisibility(View.VISIBLE);
                        break;
                    case IjkMediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START:
                    case IjkMediaPlayer.MEDIA_INFO_BUFFERING_END:
                        mLoadingLayout.setVisibility(View.GONE);
                        break;
                }
                return false;
            }
        });

        mVideoView.setOnCompletionListener(new IMediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(IMediaPlayer mp) {
                mLoadingLayout.setVisibility(View.VISIBLE);
                mVideoView.stopPlayback();
                mVideoView.release(true);
                mVideoView.setVideoURI(Uri.parse(mVideoUrl));
            }
        });

        mVideoView.setOnErrorListener(new IMediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(IMediaPlayer mp, int what, int extra) {
                if (mRetryTimes > CONNECTION_TIMES) {
                    new AlertDialog.Builder(LiveActivity.this)
                            .setMessage("节目暂时不能播放")
                            .setPositiveButton(R.string.VideoView_error_button,
                                    new DialogInterface.OnClickListener() {
                                        public void onClick(DialogInterface dialog, int whichButton) {
                                            LiveActivity.this.finish();
                                        }
                                    })
                            .setCancelable(false)
                            .show();
                } else {
                    mVideoView.stopPlayback();
                    mVideoView.release(true);
                    mVideoView.setVideoURI(Uri.parse(mVideoUrl));
                }
                return false;
            }
        });

    }

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (!mVideoView.isBackgroundPlayEnabled()) {
            mVideoView.stopPlayback();
            mVideoView.release(true);
            mVideoView.stopBackgroundPlay();
        }
        IjkMediaPlayer.native_profileEnd();
    }

    public static void activityStart(Context context, String url) {
        Intent intent = new Intent(context, LiveActivity.class);
        intent.putExtra("url", url);
        context.startActivity(intent);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
    }

}

播放器是用二次封装的ijkplayer，从主页面传url到播放页面，关才mediaplayer相关，之前专门写了专题分析，mediaplayer的状态可参考《Android Multimedia框架总结（一）MediaPlayer介绍之状态图及生命周期》
第三方播放器典型特点就是另起一个mediaplayerservice，注意这是另外一个进程，为什么是另一个进程，可参见我的文章：MediaPlayer的C/S模型。对于ijkplayer这个框架，因为做实例，才引入，不做评价，也不会去深究，满足基本播放需求就ok。市场上有很多第三方播放框架，ijkplayer,vitamio,百度云播放等。

再看下播放页的播放panel:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#22000000"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/fl_videoview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorBlack">

        <com.hejunlin.liveplayback.ijkplayer.media.IjkVideoView
            android:id="@+id/videoview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerInParent="true"
            android:background="@color/colorBlack">
        </com.hejunlin.liveplayback.ijkplayer.media.IjkVideoView>

        <RelativeLayout
            android:id="@+id/rl_loading"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#de262a3b">

            <TextView
                android:id="@+id/tv_load_msg"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/pb_loading"
                android:layout_centerInParent="true"
                android:layout_marginTop="6dp"
                android:textColor="#ffffff"
                android:textSize="16sp" />

            <ProgressBar
                android:id="@+id/pb_loading"
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:layout_centerInParent="true"
                android:layout_marginTop="60dp"
                android:indeterminate="false"            
                android:indeterminateDrawable="@drawable/video_loading"
                android:padding="5dp" />
        </RelativeLayout>
        
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/player_panel_background_color">

            <TextView
                android:id="@+id/tv_title"
                android:layout_width="wrap_content"
                android:layout_height="60dp"
                android:textSize="24dp"
                android:text="Android TV开发总结（六）构建一个TV app的直播节目实例"
                android:layout_centerVertical="true"
                android:layout_marginTop="18dp"
                android:textColor="@color/white"/>
            
            <TextView
                android:id="@+id/tv_time"
                android:layout_width="wrap_content"
                android:layout_height="60dp"
                android:textSize="20dp"
                android:layout_toRightOf="@id/tv_title"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:layout_marginLeft="60dp"
                android:layout_marginTop="20dp"
                android:textColor="@color/white"/>
        </LinearLayout>
    </RelativeLayout>
</RelativeLayout>

这里有几个点要注意：

• 为演示，并未对层级进行使用FrameLayout,及viewstub,include等性能优化相关的，在实际商用项目中，建议写xml文件，尽可能遵循过少的层级，高级标签及FrameLayout等技巧。
• 所有的size切勿直接写死，用 android:layout_marginTop="@dimen/dimen_20dp"表示，string值统一写到string.xml中，这些基本的规范，会让你提高不少效率。