import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.media.MediaPlayer;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.AudioFormat;
public class LRChannel extends Activity {
private TextView myTextView;
private MediaPlayer mMediaPlayer01 = null;
private AudioTrack aAudioTrack01 = null;
private String strFilePath
= "/sdcard/test.mp3"; private float midVol = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lButton
= (Button) findViewById
(R.
id.
ButtonL); rButton
= (Button) findViewById
(R.
id.
ButtonR); myTextView = (TextView) findViewById(R.id.myTextView);
// left button response
lButton.
setOnClickListener(new Button.
OnClickListener() {
@Override
public void onClick
(View arg0
) {
// if ( checkSDCard() )
// {
// playVideo(strFilePath);
playSound(strFilePath, 0);
// }
}
});
// right button response
rButton.
setOnClickListener(new Button.
OnClickListener() {
@Override
public void onClick
(View arg0
) {
playSound(strFilePath, 1);
}
});
}
private void playVideo
(String strPath
) {
mMediaPlayer01 = new MediaPlayer();
mMediaPlayer01.setAudioStreamType(AudioManager.STREAM_MUSIC);
try
{
mMediaPlayer01.setDataSource(strPath);
}
{
// TODO Auto-generated catch block
myTextView.setText("setDataSource Exceeption:" + e.toString());
e.printStackTrace();
}
try
{
mMediaPlayer01.prepare();
}
{
// TODO Auto-generated catch block
myTextView.setText("prepare Exceeption:"+e.toString());
e.printStackTrace();
}
mMediaPlayer01.start();
myTextView.setText("Playing");
mMediaPlayer01.setOnCompletionListener(new MediaPlayer.OnCompletionListener()
{
public void onCompletion(MediaPlayer arg0)
{
// TODO Auto-generated method stub
myTextView.setText("Playing stop!");
}
});
}
// iChannel = 0 means left channel test, iChannel = 1 means right channel test.
private void playSound
(String strPath,
int iChannel
) {
// If now is playing...
if ( aAudioTrack01 != null )
{
aAudioTrack01.release();
aAudioTrack01 = null;
}
// Get the AudioTrack minimum buffer size
int iMinBufSize = AudioTrack.getMinBufferSize(44100,
if ( iMinBufSize == AudioTrack.ERROR_BAD_VALUE || iMinBufSize == AudioTrack.ERROR )
{
return;
}
// Constructor a AudioTrack object
try
{
aAudioTrack01 = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,
iMinBufSize,
AudioTrack.MODE_STREAM);
}
{
myTextView.setText("new AudioTrack Exceeption:" + iae.toString());
iae.printStackTrace();
}
// Write data to buffer
byte data[] = new byte[iMinBufSize];
aAudioTrack01.write(data, 0, data.length);
aAudioTrack01.write(data, 0, data.length);
float lValue = 0;
float rValue = 0;
if ( iChannel == 0 )
{
lValue = 1.0f;
rValue = 0.0f;
}
else if ( iChannel == 1 )
{
lValue = 0.0f;
rValue = 1.0f;
}
aAudioTrack01.play();
if ( aAudioTrack01.setStereoVolume(lValue, rValue) == AudioTrack.SUCCESS )
{
myTextView.setText("setStereoVolume successfully!");
}
aAudioTrack01.stop();
if ( aAudioTrack01.setStereoVolume(midVol, midVol) == AudioTrack.SUCCESS )
{
myTextView.setText("Restore setStereoVolume successfully!");
}
aAudioTrack01.release();
aAudioTrack01 = null;
}
private boolean checkSDCard()
{
{
return true;
}
else
{
return false;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
// TODO Auto-generated method stub
if ( aAudioTrack01 != null ) {
aAudioTrack01.setStereoVolume(midVol, midVol);
aAudioTrack01.release();
aAudioTrack01 = null;
}
}
}
//java/6376