Android直接播放麥克風采集到的聲音

這是一個直接播放麥克風采集到的聲音線程類：

class RecordThread extends Thread{
    	static final int frequency = 44100;
    	static final int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
    	static final int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
		@Override
		public void run() {
			// TODO Auto-generated method stub
			int recBufSize = AudioRecord.getMinBufferSize(frequency,
					channelConfiguration, audioEncoding)*2;
			int plyBufSize = AudioTrack.getMinBufferSize(frequency,
					channelConfiguration, audioEncoding)*2;
			
			AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency,
					channelConfiguration, audioEncoding, recBufSize);

			AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,
					channelConfiguration, audioEncoding, plyBufSize, AudioTrack.MODE_STREAM);
			
			byte[] recBuf = new byte[recBufSize];
			audioRecord.startRecording();
			audioTrack.play();
			while(true){
				int readLen = audioRecord.read(recBuf, 0, recBufSize);
				audioTrack.write(recBuf, 0, readLen);
			}
			audioTrack.stop();
			audioRecord.stop();
		}
    }
           

使用的時候，這樣就行：

RecordThread rec = new RecordThread();
			rec.start();
           

需要在AndroidManifest.xml檔案中添加路由權限：

<uses-permission android:name="android.permission.RECORD_AUDIO"/>