我一直在尝试弄清如何在Android上将麦克风流式传输到扬声器的问题。
我希望有一个按钮可以开启和关闭这个功能。
我找到了一些代码，但是让它工作起来是个问题。如果我从按钮中运行此代码，应用程序会崩溃。似乎很难仅仅将麦克风的声音播放到扬声器中。
提前感谢大家的帮助！
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
// Variables
private static final String TAG = "Aufnahme";
private AudioRecord recorder = null;
private boolean isRecording = false;
private int SAMPLERATE = 8000;
private int CHANNELS = AudioFormat.CHANNEL_CONFIGURATION_MONO;
private int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
private int bufferSize = AudioRecord.getMinBufferSize(SAMPLERATE, CHANNELS, AUDIO_FORMAT);
private Thread recordingThread = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
SetupRecordButton();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void SetupRecordButton(){
Button recordButton = (Button) findViewById(R.id.button);
recordButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
startRecording();
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void startRecording() {
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLERATE,
CHANNELS, AUDIO_FORMAT, bufferSize);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable()
{
public void run() {
writeAudioData();
}
});
//Start recording thread
recordingThread.start();
}
public void stopRecording() {
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
private void writeAudioData() {
byte data[] = new byte[bufferSize];
while (isRecording) {
recorder.read(data, 0, bufferSize);
send(data);
}
}
private void send(byte[] data) {
int minBufferSize = AudioTrack.getMinBufferSize(8000,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 8000,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, minBufferSize,
AudioTrack.MODE_STREAM);
at.play();
at.write(data, 0, bufferSize);
at.stop();
at.release();
}
}
