我想创建一个录音应用程序，它将记录手机扬声器的输出声音，例如，如果我在手机上播放收音机，通过使用此应用程序，我可以捕获并记录输出，后来我可以通过播放录制的文件来播放声音或歌曲
现在我可以录制来自麦克风的声音，所以我想修改代码，有人能告诉我该怎么做吗？
这是我的主要活动
public class MainActivity extends AppCompatActivity {
private Button play,stop,record;
private MediaRecorder myAudioRecorder;
private String outputfile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play=(Button)findViewById(R.id.play);
stop=(Button)findViewById(R.id.stop);
record=(Button)findViewById(R.id.record);
stop.setEnabled(false);
play.setEnabled(false);
//outputfile= Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording_"+System.currentTimeMillis()+".mp3";
File directorysample=new File(Environment.getExternalStorageDirectory()+separator+"RadioRecords");
directorysample.mkdirs();
String filename = "/recording_" + System.currentTimeMillis() + ".mp3";
final String directory = Environment.getExternalStorageDirectory()+ "/RadioRecords";
outputfile = directory + "/" + filename;
//record function
record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
myAudioRecorder=new MediaRecorder();
myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.DEFAULT);
myAudioRecorder.setOutputFile(outputfile);
myAudioRecorder.prepare();
myAudioRecorder.start();
}
catch (IllegalStateException ise){
}catch (IOException ioe){
}
record.setEnabled(false);
stop.setEnabled(true);
Toast.makeText(getApplicationContext(),"record startded",Toast.LENGTH_LONG).show();
}
});
//stop function
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
myAudioRecorder.stop();
record.setEnabled(true);
myAudioRecorder.release();
myAudioRecorder=null;
stop.setEnabled(false);
play.setEnabled(true);
Toast.makeText(getApplicationContext(),"recorded audio",Toast.LENGTH_LONG).show();
}
});
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MediaPlayer mediaPlayer=new MediaPlayer();
try {
mediaPlayer.setDataSource(outputfile);
mediaPlayer.prepare();
mediaPlayer.start();
Toast.makeText(getApplicationContext(),"playing audio",Toast.LENGTH_LONG).show();
}
catch (Exception e)
{
}
}
});
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();
}
});
}
@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;
}
@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);
}
}