Android Q及以上系统音频捕获功能（声音内录）的简单实现 |
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前言
现在越来越多的视频类APP，如抖音、快手、B站等等，都开放了音频捕获配置，也就是android:allowAudioPlaybackCapture="true"。因此学习如何捕获音频实现声音内录，是很有必要的。
第一步：设置allowAudioPlaybackCapture
很简单，在项目AndroidManifest.xml的application中增加一句android:allowAudioPlaybackCapture="true" 第二步：配置Service注意：本文只适用在Android Q及以上版本，因此必须使用前台服务方式startForegroundService()来启动服务。 请在Service的onCreate()中实现前台服务通知。 第三步：开始使用录制或投射内容1.向用户询问是否开始使用录制或投射内容，注意：在Activity或Fragment中询问。 if (currentResultCode != Activity.RESULT_OK || resultData == null) { MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) this.getSystemService(MEDIA_PROJECTION_SERVICE); Intent screenCaptureIntent = mediaProjectionManager.createScreenCaptureIntent(); startActivityForResult(screenCaptureIntent, REQUEST_SCREEN_CAPTURE_CODE); return; }2.在onActivityResult()中获取currentResultCode和resultData @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == REQUEST_SCREEN_CAPTURE_CODE) { currentResultCode = resultCode; resultData = data; } }3.将currentResultCode和resultData传递给Service Intent intent = new Intent(this, RecordService.class); intent.putExtra("resultData", resultData); intent.putExtra("resultCode", currentResultCode); startForegroundService(intent);4.在Service的onStartCommand()中接收currentResultCode和resultData，获取MediaProjection实例（实例化要在前台Service中进行，这就是为什么要用Service的原因），并配置和启动AudioRecord @Override public int onStartCommand(Intent intent, int flags, int startId) { int currentResultCode = intent.getIntExtra("resultCode", 0); Intent resultData = intent.getParcelableExtra("resultData"); minBufferSize = AudioRecord.getMinBufferSize(16000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) getBaseContext() .getSystemService(MEDIA_PROJECTION_SERVICE); MediaProjection mediaProjection = mediaProjectionManager.getMediaProjection(currentResultCode, Objects.requireNonNull(resultData)); AudioRecord.Builder builder = new AudioRecord.Builder(); builder.setAudioFormat(new AudioFormat.Builder() .setSampleRate(16000) .setChannelMask(AudioFormat.CHANNEL_IN_MONO) .setEncoding(AudioFormat.ENCODING_PCM_16BIT) .build()) .setBufferSizeInBytes(minBufferSize); AudioPlaybackCaptureConfiguration config = new AudioPlaybackCaptureConfiguration.Builder(mediaProjection) .addMatchingUsage(AudioAttributes.USAGE_MEDIA) .addMatchingUsage(AudioAttributes.USAGE_UNKNOWN) .addMatchingUsage(AudioAttributes.USAGE_GAME) .build(); builder.setAudioPlaybackCaptureConfig(config); try { if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) { audioRecord = builder.build(); } } catch (Exception e) { Log.e("录音器错误", "录音器初始化失败"); } startRecord(); return super.onStartCommand(intent, flags, startId); }demo下载地址：https://download.csdn.net/download/sinat_39508948/86955519 完毕 |
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