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
<service
android:name=".RecordService"
android:exported="true"
android:foregroundServiceType="mediaProjection"
android:enabled="true"/>
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