最近在做Android TV O的項(xiàng)目，需要在TV 桌面添加自定義頻道/節(jié)目，節(jié)目的背景圖片要顯示為SD卡或者緩存目錄里面的圖片。

添加自定義頻道

節(jié)目背景顯示本地目錄的圖片

一、添加頻道

1. 首先新建頻道、節(jié)目實(shí)體類，屬性如下。

public class MediaChannel {private final String mName;private final String mDescription;private final String mMediaUri;private final String mBgImage;private final String mTitle;private final String mMediaChannelId;private List<MediaProgram> mPrograms;private boolean mChannelPublished;private long mChannelId;MediaChannel(String name, List<MediaProgram> programs, String mediaChannelId) {mName = name;mTitle = "playlist title";mDescription = "playlist description";mMediaUri = "dsf";mBgImage = "asdf";mPrograms = programs;mMediaChannelId = mediaChannelId;}// 省略 set get toString }public class MediaProgram implements Parcelable {private final String mMediaProgramId;private final String mContentId;private final String mTitle;private final String mDescription;private final String mBgImageUrl;private final String mCardImageUrl;private final String mMediaUrl;private final String mPreviewMediaUrl;private final String mCategory;private long mProgramId;private int mViewCount;MediaProgram(String title, String description, String bgImageUrl, String cardImageUrl,String category, String mediaProgramId, String contentId) {mMediaProgramId = mediaProgramId;mContentId = contentId;mTitle = title;mDescription = description;mBgImageUrl = bgImageUrl;mCardImageUrl = cardImageUrl;mMediaUrl = "";mPreviewMediaUrl = "";mCategory = category;}// 省略 set get toString }

2. 初始化頻道、節(jié)目信息

private void initChannel() {Uri usbUri = getUSBCardImageFileUri();Uri pvrUri = getPVRCardImageFileUri();grantUriPermissionToApp("com.google.android.tvlauncher", usbUri);grantUriPermissionToApp("com.google.android.tvlauncher", pvrUri);String bgImageUrl = "";String usbCardImageUrl = getUSBCardImageFileUri().toString();String pvrCardImageUrl = getPVRCardImageFileUri().toString();int mediaProgramId = 1;int contentId = 0;MediaProgram usbProgram = new MediaProgram("USB", "usb description", bgImageUrl, usbCardImageUrl,"USB category", Integer.toString(mediaProgramId), Integer.toString(contentId ++));MediaProgram pvrProgram = new MediaProgram("PVR", "pvr description", bgImageUrl, pvrCardImageUrl,"PVR category", Integer.toString(mediaProgramId), Integer.toString(contentId ++));List<MediaProgram> programs = new ArrayList<>();programs.add(usbProgram);programs.add(pvrProgram);mChannelId = LocalDataManager.getChannelId(this);mChannel = new MediaChannel("MediaChannel", programs, Long.toString(mChannelId)); }private Uri getUSBCardImageFileUri() {String sdPath = Environment.getExternalStorageDirectory().getPath();File file = new File(sdPath + "/Pictures/mediachannel/usb_thumbnail.jpg");Uri uri = FileProvider.getUriForFile(this, "com.rogera.mediaplaychannel.fileprovider", file);Log.v(TAG, "uri:" + uri.toString());return uri;}private Uri getPVRCardImageFileUri() {String sdPath = Environment.getExternalStorageDirectory().getPath();File file = new File(sdPath + "/Pictures/mediachannel/pvr_thumbnail.jpg");Uri uri = FileProvider.getUriForFile(this, "com.rogera.mediaplaychannel.fileprovider", file);Log.v(TAG, "uri:" + uri.toString());return uri;}private void grantUriPermissionToApp(String packageName, Uri uri) {grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);}

3.添加頻道、節(jié)目

mChannelId = MediaTVProvider.addChannel(MainActivity.this, mChannel);

mChannel 為initChannel() 方法里面初始化的實(shí)體類

貼出核心類MediaTVProvider.java

package com.rogera.mediaplaychannel;import android.content.ComponentName; import android.content.ContentUris; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.support.annotation.DrawableRes; import android.support.annotation.WorkerThread; import android.support.media.tv.Channel; import android.support.media.tv.ChannelLogoUtils; import android.support.media.tv.PreviewProgram; import android.support.media.tv.TvContractCompat; import android.text.TextUtils; import android.util.Log;import java.util.List;/*** Created by rogera on 2017/12/30.*/ public class MediaTVProvider {private static final String TAG = "MediaTVProvider";private static final String SCHEME = "tvmediachannels";private static final String APPS_LAUNCH_HOST = "com.google.android.tvmediachannels";private static final String PLAY_MEDIA_ACTION_PATH = "playMedia";private static final String START_APP_ACTION_PATH = "startApp";private static final Uri PREVIEW_PROGRAMS_CONTENT_URI =Uri.parse("content://android.media.tv/preview_program");static private String createInputId(Context context) {ComponentName cName = new ComponentName(context, MainActivity.class.getName());return TvContractCompat.buildInputId(cName);}@WorkerThreadstatic long addChannel(Context context, MediaChannel mediaChannel) {String channelInputId = createInputId(context);Channel channel = new Channel.Builder().setDisplayName(mediaChannel.getName()).setDescription(mediaChannel.getDescription()).setType(TvContractCompat.Channels.TYPE_PREVIEW).setInputId(channelInputId).setAppLinkIntentUri(Uri.parse(SCHEME + "://" + APPS_LAUNCH_HOST+ "/" + START_APP_ACTION_PATH)).setInternalProviderId(mediaChannel.getMediaChannelId()).build();Uri channelUri = context.getContentResolver().insert(TvContractCompat.Channels.CONTENT_URI,channel.toContentValues());if (channelUri == null || channelUri.equals(Uri.EMPTY)) {Log.e(TAG, "addChannel Insert channel failed");return 0;}long channelId = ContentUris.parseId(channelUri);mediaChannel.setChannelPublishedId(channelId);writeChannelLogo(context, channelId, R.drawable.media_logo);List<MediaProgram> programs = mediaChannel.getMediaPrograms();int weight = programs.size();for (int i = 0; i < programs.size(); ++i, --weight) {MediaProgram mp = programs.get(i);final String mediaProgramId = mp.getMediaProgramId();final String contentId = mp.getContentId();PreviewProgram program = new PreviewProgram.Builder().setChannelId(channelId).setTitle(mp.getTitle()).setDescription(mp.getDescription()).setPosterArtUri(Uri.parse(mp.getCardImageUrl())).setIntentUri(Uri.parse(SCHEME + "://" + APPS_LAUNCH_HOST+ "/" + PLAY_MEDIA_ACTION_PATH + "/" + mediaProgramId))//.setPreviewVideoUri(Uri.parse(mp.getPreviewMediaUrl())).setInternalProviderId(mediaProgramId).setContentId(contentId).setWeight(weight).setType(TvContractCompat.PreviewPrograms.TYPE_CLIP).build();Uri programUri = context.getContentResolver().insert(PREVIEW_PROGRAMS_CONTENT_URI,program.toContentValues());if (programUri == null || programUri.equals(Uri.EMPTY)) {Log.e(TAG, "addChannel Insert program failed");} else {mp.setProgramId(ContentUris.parseId(programUri));}}return channelId;}@WorkerThreadstatic void deleteChannel(Context context, long channelId) {int rowsDeleted = context.getContentResolver().delete(TvContractCompat.buildChannelUri(channelId), null, null);if (rowsDeleted < 1) {Log.e(TAG, "Delete channel failed");}}@WorkerThreadpublic static void deleteProgram(Context context, MediaProgram program) {deleteProgram(context, program.getProgramId());}@WorkerThreadstatic void deleteProgram(Context context, long programId) {int rowsDeleted = context.getContentResolver().delete(TvContractCompat.buildPreviewProgramUri(programId), null, null);if (rowsDeleted < 1) {Log.e(TAG, "Delete program failed");}}/*** Writes a drawable as the channel logo.** @param channelId identifies the channel to write the logo.* @param drawableId resource to write as the channel logo. This must be a bitmap and not, say* a vector drawable.*/@WorkerThreadstatic private void writeChannelLogo(Context context, long channelId,@DrawableRes int drawableId) {Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), drawableId);ChannelLogoUtils.storeChannelLogo(context, channelId, bitmap);}@WorkerThreadstatic void updateMediaProgram(Context context, MediaProgram mediaProgram) {long programId = mediaProgram.getProgramId();Uri programUri = TvContractCompat.buildPreviewProgramUri(programId);try (Cursor cursor = context.getContentResolver().query(programUri, null, null, null,null)) {if (!cursor.moveToFirst()) {Log.e(TAG, "Update program failed");}PreviewProgram porgram = PreviewProgram.fromCursor(cursor);PreviewProgram.Builder builder = new PreviewProgram.Builder(porgram).setTitle(mediaProgram.getTitle());int rowsUpdated = context.getContentResolver().update(programUri,builder.build().toContentValues(), null, null);if (rowsUpdated < 1) {Log.e(TAG, "Update program failed");}}}static void publishProgram(Context context, MediaProgram mediaProgram, long channelId, int weight) {final String mediaProgramId = mediaProgram.getMediaProgramId();PreviewProgram program = new PreviewProgram.Builder().setChannelId(channelId).setTitle(mediaProgram.getTitle()).setDescription(mediaProgram.getDescription()).setPosterArtUri(Uri.parse(mediaProgram.getCardImageUrl())).setIntentUri(Uri.parse(SCHEME + "://" + APPS_LAUNCH_HOST+ "/" + PLAY_MEDIA_ACTION_PATH + "/" + mediaProgramId)).setPreviewVideoUri(Uri.parse(mediaProgram.getPreviewMediaUrl())).setInternalProviderId(mediaProgramId).setWeight(weight).setType(TvContractCompat.PreviewPrograms.TYPE_MOVIE).build();Uri programUri = context.getContentResolver().insert(PREVIEW_PROGRAMS_CONTENT_URI,program.toContentValues());if (programUri == null || programUri.equals(Uri.EMPTY)) {Log.e(TAG, "Insert program failed");return;}mediaProgram.setProgramId(ContentUris.parseId(programUri));}@WorkerThreadstatic void setProgramViewCount(Context context, long programId, int numberOfViews) {Uri programUri = TvContractCompat.buildPreviewProgramUri(programId);try (Cursor cursor = context.getContentResolver().query(programUri, null, null, null,null)) {if (!cursor.moveToFirst()) {return;}PreviewProgram existingProgram = PreviewProgram.fromCursor(cursor);PreviewProgram.Builder builder = new PreviewProgram.Builder(existingProgram).setInteractionCount(numberOfViews).setInteractionType(TvContractCompat.PreviewProgramColumns.INTERACTION_TYPE_VIEWS);int rowsUpdated = context.getContentResolver().update(TvContractCompat.buildPreviewProgramUri(programId),builder.build().toContentValues(), null, null);if (rowsUpdated != 1) {Log.e(TAG, "Update program failed");}}} }

二、節(jié)目背景顯示本地目錄的圖片

對(duì)于顯示本地圖片，需要使用FileProvider 獲取圖片文件的uri然后設(shè)置給節(jié)目。如果使用 Uri.fromFile(new File(filePath) 這種方式，就會(huì)報(bào)Permission問(wèn)題:
class java.io.FileNotFoundException: /storage/emulated/0/Pictures/mediachannel/usb_thumbnail.jpg (Permission denied)

使用FileProvider分享文件給其他應(yīng)用需要給對(duì)應(yīng)的應(yīng)用賦予讀權(quán)限，可以通過(guò)如下兩種方式：

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);grantUriPermissionToApp("com.google.android.tvlauncher", usbUri);

這里只能使用第二種方式了。com.google.android.tvlauncher 為TV launcher的包名。

1. 使用FileProvider首先需要在AndroidManifest.xml 節(jié)點(diǎn)下申明

<providerandroid:name="android.support.v4.content.FileProvider"android:authorities="com.rogera.mediaplaychannel.fileprovider"android:grantUriPermissions="true"android:exported="false"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/filepaths" /></provider>

2. 在res下xml文件夾下新建filepaths.xml

<?xml version="1.0" encoding="utf-8"?> <paths xmlns:android="http://schemas.android.com/apk/res/android"><external-path path="Pictures" name="pictures" /> </paths>

3. 獲取文件URI

File file = new File(sdPath + "/Pictures/mediachannel/usb_thumbnail.jpg"); Uri uri = FileProvider.getUriForFile(this, "com.rogera.mediaplaychannel.fileprovider", file);

三、其他說(shuō)明

1、sdcard里面的文件是push進(jìn)去的，是假設(shè)應(yīng)用獲取U盤里面的電影/圖片/音樂(lè) 生成的縮略圖。點(diǎn)擊桌面的usb節(jié)目就會(huì)播放相應(yīng)的電影/圖片/音樂(lè)。

2. 在桌面添加頻道、節(jié)目需要申請(qǐng)EPG權(quán)限，SD需要申請(qǐng)storage權(quán)限

<uses-permission android:name="com.android.providers.tv.permission.WRITE_EPG_DATA" /> <uses-permission android:name="com.android.providers.tv.permission.READ_EPG_DATA" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

3. 同時(shí)需要在gradle添加如下依賴

implementation 'com.android.support:leanback-v17:26.1.0' implementation 'com.android.support:support-tv-provider:26.1.0'

4. 上圖啦

Google官方參考：https://developer.android.google.cn/training/tv/tif/channel.html#update

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