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本小节主要说明 HarmonyOS 车载多媒体的使用方法，以音乐 Demo 开发为例，开发步骤如下：
- 在布局中添加音乐播放控件。
<?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:id="$+id:play_music_root" ohos:width="-1" ohos:height="-1" ohos:left_padding="24vp" ohos:right_padding="24vp" ohos:orientation="1"> <AdaptiveBoxLayout ohos:id="$+id:title_bar" ohos:width="-1" ohos:height="-2" ohos:top_margin="24vp"> <Image ohos:id="$+id:arrow_down_btn" ohos:width="24vp" ohos:height="24vp" ohos:align_parent_left="$+id:title_bar" ohos:image_src="$media:default.png"/> <Image ohos:id="$+id:music_heart_btn" ohos:width="24vp" ohos:height="24vp" ohos:left_of="$+id:music_hiplay_btn" ohos:image_src="$media:default.png"/> <Image ohos:id="$+id:music_hiplay_btn" ohos:width="24vp" ohos:height="24vp" ohos:left_margin="16vp" ohos:align_parent_right="$+id:title_bar" ohos:image_src="$media:default.png"/> </AdaptiveBoxLayout> <DirectionalLayout ohos:id="$+id:cover_container" ohos:width="-1" ohos:height="-2" ohos:weight="1" ohos:orientation="1"> <AdaptiveBoxLayout ohos:id="$+id:music_cover_adapt" ohos:width="-1" ohos:height="-1"> <DirectionalLayout ohos:id="$+id:music_cover_wrap1" ohos:width="-2" ohos:height="-2" ohos:padding="20vp" ohos:orientation="1"> <Image ohos:id="$+id:music_cover" ohos:width="300vp" ohos:height="300vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:music_cover_wrap2" ohos:width="-1" ohos:height="-1" ohos:orientation="1"> <DirectionalLayout ohos:width="-1" ohos:height="-2" ohos:layout_alignment="17" ohos:top_margin="20vp" ohos:bottom_margin="20vp" ohos:orientation="1"> <Text ohos:id="$+id:music_title" ohos:text_size="20vp" ohos:shape="0" ohos:text_color="#FF000000" ohos:text_alignment="72" ohos:width="-1" ohos:height="-2" ohos:multiple_lines="false"/> <Text ohos:id="$+id:music_auth" ohos:text_size="14vp" ohos:shape="0" ohos:top_margin="4vp" ohos:text_color="#FF000000" ohos:text_alignment="72" ohos:width="-1" ohos:height="-2" ohos:multiple_lines="false"/> </DirectionalLayout> <Text ohos:id="$+id:music_lrc" ohos:width="-1" ohos:height="-2" ohos:layout_alignment="17" ohos:text="See the lights see the party the ball grows" ohos:text_size="13vp" ohos:text_color="#FF000000" ohos:text_alignment="72"/> </DirectionalLayout> </AdaptiveBoxLayout> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:foot_wrap" ohos:width="-1" ohos:height="-2" ohos:orientation="1"> <DirectionalLayout ohos:id="$+id:progress_container" ohos:width="-1" ohos:height="-2" ohos:top_margin="10vp" ohos:orientation="0"> <Text ohos:id="$+id:play_progress_time" ohos:width="-2" ohos:height="-2" ohos:layout_alignment="16" ohos:right_margin="6vp" ohos:text_size="13vp" ohos:text_color="#FF000000" ohos:text_alignment="72"/> <SeekBar ohos:id="$+id:play_progress_bar" ohos:width="-1" ohos:height="14vp" ohos:layout_alignment="16" ohos:weight="1"/> <Text ohos:id="$+id:play_total_time" ohos:width="-2" ohos:height="-2" ohos:layout_alignment="16" ohos:left_margin="6vp" ohos:text_size="13vp" ohos:text_color="#FF000000" ohos:text_alignment="72"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:control_container" ohos:width="-1" ohos:height="96vp" ohos:orientation="0"> <DirectionalLayout ohos:id="$+id:control_box1" ohos:width="-2" ohos:height="-2" ohos:weight="1" ohos:layout_alignment="17" ohos:orientation="1"> <Image ohos:id="$+id:volume_down_btn" ohos:width="24vp" ohos:height="24vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:control_box2" ohos:width="-2" ohos:height="-2" ohos:weight="1" ohos:layout_alignment="17" ohos:orientation="1"> <Image ohos:id="$+id:prev_btn" ohos:width="40vp" ohos:height="40vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:control_box3" ohos:width="-2" ohos:height="-2" ohos:weight="1" ohos:layout_alignment="17" ohos:orientation="1"> <Image ohos:id="$+id:play_btn" ohos:width="64vp" ohos:height="64vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:control_box4" ohos:width="-2" ohos:height="-2" ohos:weight="1" ohos:layout_alignment="17" ohos:orientation="1"> <Image ohos:id="$+id:next_btn" ohos:width="40vp" ohos:height="40vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> <DirectionalLayout ohos:id="$+id:control_box5" ohos:width="-2" ohos:height="-2" ohos:weight="1" ohos:layout_alignment="17" ohos:orientation="1"> <Image ohos:id="$+id:volume_up_btn" ohos:width="24vp" ohos:height="24vp" ohos:layout_alignment="17" ohos:image_src="$media:default.png"/> </DirectionalLayout> </DirectionalLayout> </DirectionalLayout> </DirectionalLayout>
- 加载播放控件。
super.setUIContent(ResourceTable.Layout_play_music_layout);
- 实现音乐播放管理类。
public class PlayManager { ... private Player player; public synchronized boolean play(String filePath, int startMilliSecond) { ... FileDescriptor fd = IoUtil.getFileDescriptor(filePath); Source source = new Source(fd); player.setSource(source); boolean isSuccess = player.prepare(); isSuccess = player.rewindTo(startMilliSecond * MICRO_MILLI_RATE, REWIND_NEXT_SYNC); // 播放 isSuccess = player.play(); isPlaying.set(isSuccess); return isSuccess; } public synchronized void pause(int startMilliSecond) { ... player.pause(); } public synchronized void stop() { if (player == null) { return; } player.stop(); isPlaying.set(false); LogUtil.info(TAG, "stop success"); player.release(); player = null; } }
- 调用音乐播放管理类的接口播放音乐。
// 指定歌曲播放 String path = "/data/music/files/data/wonderful_life.mp3"; PlayManager.getInstance().play(path,1);
- 在布局中增加视频播放控件。
// 视频布局实现方法 public class MySurfaceSlice extends AbilitySlice { ... public void makeSurfaceView() { ... mySurfaceProvider = new SurfaceProvider(this); adaptiveBoxLayoutSurfaceView.AdaptiveBoxLayout.LayoutConfig().addComponent(mySurfaceProvider); } }
- 实现视频播放管理类。
public class VideoPlay { public synchronized void startPlay() { ... ret = playImpl.play(); } public synchronized void preParePlay() { ... ret = playImpl.prepare(); } public synchronized void pausePlay() { ... boolean pauseRet = playImpl.pause();; } public synchronized void setSourcePlay(String filePath) { ... FileDescriptor fd = IoUtil.getFileDescriptor(filePath); Source source = new Source(fd); playImpl.setSource(source); } @Override public synchronized void onStop() { ... super.onStop(); } }
- 调用视频播放管理类的接口播放视频。
// 调用视频播放类进行播放 String filePath = "/data/video/files/data/festival.mp4"; VideoPlay videoPlay = new VideoPlay() videoPlay.setSourcePlay(filePath); videoPlay.startPlay();
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