我的活动下面使用Some Helper Classess播放ShoutCastURL流媒体
代码：
import java.net.MalformedURLException;
import com.androidworkz.androidshoutcastlib.AndroidShoutcastLib;
import com.androidworkz.androidshoutcastlib.InvalidStreamURLException;
import com.androidworkz.androidshoutcastlib.Metadata;
import com.androidworkz.androidshoutcastlib.MetadataListener;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.PowerManager;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Player extends Activity implements OnCompletionListener,
OnPreparedListener, OnErrorListener, OnBufferingUpdateListener, MusicFocusable {
private Boolean playState = false;
private String station = "http://38.101.195.5:9156";
public static final float DUCK_VOLUME = 0.1f;
private String artistName = null;
private String trackName = null;
private TextView artist;
private TextView track;
private TextView status;
private Button play;
enum AudioFocus {
NoFocusNoDuck, // we don't have audio focus, and can't duck
NoFocusCanDuck, // we don't have focus, but can play at a low volume
// ("ducking")
Focused // we have full audio focus
}
private AudioFocus mAudioFocus = AudioFocus.NoFocusNoDuck;
private MediaPlayer mPlayer = null;
private AndroidShoutcastLib shoutcast;
private AudioManager mAudioManager;
AudioFocusHelper mAudioFocusHelper = null;
Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
// create the Audio Focus Helper, if the Audio Focus feature is
// available (SDK 8 or above)
if (android.os.Build.VERSION.SDK_INT >= 8) {
mAudioFocusHelper = new AudioFocusHelper(getApplicationContext(),
this);
}
else {
mAudioFocus = AudioFocus.Focused; // no focus feature, so we always "have" audio focus
}
status = (TextView) findViewById(R.id.status);
artist = (TextView) findViewById(R.id.artist);
artist.setSelected(true);
track = (TextView) findViewById(R.id.track);
track.setSelected(true);
play = (Button) findViewById(R.id.play);
play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View btn) {
if (!playState) {
play.setText("Pause");
handler.postDelayed(handlePlayRequest, 300);
}
else {
play.setText("Play");
status.setText("Press Play");
handler.postDelayed(handlePlayRequest, 300);
}
}
});
shoutcast = new AndroidShoutcastLib();
try {
shoutcast.setShoutcastUrl(station);
} catch (InvalidStreamURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
shoutcast.setOnMetadataChangedListener(new MetadataListener(){
@Override
public void OnMetadataChanged(Metadata item) {
artistName = item.artist;
trackName = item.track;
updateMeta();
}
});
setVolumeControlStream(AudioManager.STREAM_MUSIC);
}
public void onDestroy() {
super.onDestroy();
shoutcast = null;
handler.removeCallbacks(handlePlayRequest);
}
public void updateMeta() {
handler.post(new Runnable() {
@Override
public void run() {
// This gets executed on the UI thread so it can safely modify Views
artist.setText(artistName);
track.setText(trackName);
}
});
}
private final Runnable handlePlayRequest = new Runnable() {
public void run() {
if (playState) {
Log.d("Player", "Stop Called");
giveUpAudioFocus();
mPlayer.stop();
mPlayer.reset();
mPlayer.release();
shoutcast.stopStream();
mPlayer = null;
playState = false;
}
else {
Log.d("Player", "Play Called");
createMediaPlayer();
getAudioFocus();
try {
mPlayer.setDataSource(shoutcast.startStream());
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidStreamURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mPlayer.prepareAsync();
}
}
};
private void createMediaPlayer() {
mPlayer = new MediaPlayer();
// Make sure the media player will acquire a wake-lock while
// playing. If we don't do
// that, the CPU might go to sleep while the song is playing,
// causing playback to stop.
//
// Remember that to use this, we have to declare the
// android.permission.WAKE_LOCK
// permission in AndroidManifest.xml.
mPlayer.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
// we want the media player to notify us when it's ready preparing,
// and when it's done
// playing:
mPlayer.setOnPreparedListener(this);
mPlayer.setOnCompletionListener(this);
mPlayer.setOnErrorListener(this);
}
private void startPlayer() {
mPlayer.setVolume(1.0f, 1.0f);
if (!mPlayer.isPlaying()) {
Log.d("Player", "Starting Playback");
mPlayer.start();
playState = true;
status.setText("Streaming");
}
}
private void getAudioFocus() {
if (mAudioFocus != AudioFocus.Focused && mAudioFocusHelper != null
&& mAudioFocusHelper.requestFocus())
mAudioFocus = AudioFocus.Focused;
}
private void giveUpAudioFocus() {
if (mAudioFocus == AudioFocus.Focused && mAudioFocusHelper != null
&& mAudioFocusHelper.abandonFocus())
mAudioFocus = AudioFocus.NoFocusNoDuck;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_player, menu);
return true;
}
@Override
public void onBufferingUpdate(MediaPlayer arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
playState = false;
handler.post(handlePlayRequest);
return false;
}
@Override
public void onPrepared(MediaPlayer arg0) {
startPlayer();
}
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
}
@Override
public void onGainedAudioFocus() {
// TODO Auto-generated method stub
}
@Override
public void onLostAudioFocus(boolean canDuck) {
// TODO Auto-generated method stub
}
}
当我在ForeGround中播放Stream时，上面的代码工作正常，
但我的要求是在后台播放流（我的代码应播放流，如果用户也在与其他应用程序交互）
为此，我已经在服务上面创建了一个服务类
以下是代码：
活动：
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Player extends Activity implements OnClickListener {
private Boolean playState = false;
public static final float DUCK_VOLUME = 0.1f;
private String artistName = null;
private String trackName = null;
private TextView artist;
private TextView track;
private TextView status;
private Button play;
Intent playbackServiceIntent;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_player);
// create the Audio Focus Helper, if the Audio Focus feature is
// available (SDK 8 or above)
status = (TextView) findViewById(R.id.status);
artist = (TextView) findViewById(R.id.artist);
artist.setSelected(true);
track = (TextView) findViewById(R.id.track);
track.setSelected(true);
play = (Button) findViewById(R.id.play);
play.setOnClickListener(this);
playbackServiceIntent = new Intent(this, BackGroundService.class);
}
@Override
public void onClick(View v) {
if (v == play) {
startService(playbackServiceIntent);
Log.d("hi>>>>>", "gjgj");
finish();
}
}
}
服务类：
import com.androidworkz.androidshoutcastlib.AndroidShoutcastLib;
import com.androidworkz.androidshoutcastlib.InvalidStreamURLException;
import android.app.Service;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.IBinder;
import android.os.PowerManager;
import android.util.Log;
public class BackGroundService extends Service implements OnCompletionListener,
OnPreparedListener, OnErrorListener, OnBufferingUpdateListener,
MusicFocusable {
private Boolean playState = false;
private String station = "http://38.101.195.5:9156";
public static final float DUCK_VOLUME = 0.1f;
Runnable handlePlayRequest;
enum AudioFocus {
NoFocusNoDuck, // we don't have audio focus, and can't duck
NoFocusCanDuck, // we don't have focus, but can play at a low volume
// ("ducking")
Focused // we have full audio focus
}
private AudioFocus mAudioFocus = AudioFocus.NoFocusNoDuck;
private MediaPlayer mPlayer = null;
private AndroidShoutcastLib shoutcast;
private AudioManager mAudioManager;
AudioFocusHelper mAudioFocusHelper = null;
Handler handler = new Handler();
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("onStartCommand>>>", "onStartCommand");
mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
// create the Audio Focus Helper, if the Audio Focus feature is
// available (SDK 8 or above)
if (android.os.Build.VERSION.SDK_INT >= 8) {
mAudioFocusHelper = new AudioFocusHelper(getApplicationContext(),
this);
} else {
mAudioFocus = AudioFocus.Focused; // no focus feature, so we always
// "have" audio focus
}
shoutcast = new AndroidShoutcastLib();
try {
Log.d("Station>>>", station);
shoutcast.setShoutcastUrl(station);
} catch (InvalidStreamURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new BackgroundSound().execute();
return START_STICKY;
}
public void onDestroy() {
Log.d("onDestroy>>>", "onDestroy");
if (mPlayer.isPlaying()) {
mPlayer.stop();
}
mPlayer.release();
}
@Override
public void onGainedAudioFocus() {
// TODO Auto-generated method stub
}
@Override
public void onLostAudioFocus(boolean canDuck) {
// TODO Auto-generated method stub
}
@Override
public void onBufferingUpdate(MediaPlayer arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onPrepared(MediaPlayer arg0) {
// TODO Auto-generated method stub
mPlayer.start();
}
private void giveUpAudioFocus() {
if (mAudioFocus == AudioFocus.Focused && mAudioFocusHelper != null
&& mAudioFocusHelper.abandonFocus())
mAudioFocus = AudioFocus.NoFocusNoDuck;
}
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
stopSelf();
}
private void getAudioFocus() {
if (mAudioFocus != AudioFocus.Focused && mAudioFocusHelper != null
&& mAudioFocusHelper.requestFocus())
mAudioFocus = AudioFocus.Focused;
}
private void createMediaPlayer() {
mPlayer = new MediaPlayer();
// Make sure the media player will acquire a wake-lock while
// playing. If we don't do
// that, the CPU might go to sleep while the song is playing,
// causing playback to stop.
//
// Remember that to use this, we have to declare the
// android.permission.WAKE_LOCK
// permission in AndroidManifest.xml.
mPlayer.setWakeMode(getApplicationContext(),
PowerManager.PARTIAL_WAKE_LOCK);
// we want the media player to notify us when it's ready preparing,
// and when it's done
// playing:
mPlayer.setOnPreparedListener(this);
mPlayer.setOnCompletionListener(this);
mPlayer.setOnErrorListener(this);
}
private class BackgroundSound extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
Log.d("doInBackground>>>", "doInBackground");
Log.d("run>>>", "run");
if (playState) {
Log.d("Player", "Stop Called");
giveUpAudioFocus();
mPlayer.stop();
mPlayer.reset();
mPlayer.release();
shoutcast.stopStream();
mPlayer = null;
playState = false;
} else {
Log.d("Player", "Play Called");
createMediaPlayer();
getAudioFocus();
try {
mPlayer.setDataSource(shoutcast.startStream());
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidStreamURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mPlayer.prepareAsync();
}
return null;
}
}
}
当我执行上面的Service Class时，我可以播放Stream，但是当控件进入Service Class时，我的布局很糟糕
有一点，我想知道，我从活动到服务的转换是否正确？
任何人都可以建议我正确的代码吗？
答案 0 :(得分：1)
如果您只想为您的应用播放背景音乐，请在从您的app /使用AsyncTask类启动的线程中播放它，为您完成。
服务的概念是在后台运行;通过背景，通常意味着您的应用UI 不可见。是的，它可以像你一样使用（如果你记得停止它），但它不正确，它消耗你不应该使用的资源。
如果您想在活动的背景上执行任务，请使用AsyncTask。
顺便说一句，onStart已被弃用。当您使用服务时，请实现onStartCommand。
<强>更新
我认为此代码适合您。添加此类（包含在您的活动类中）。
public class BackgroundSound extends AsyncTask<Void, Void, Void> { @Override protected Void doInBackground(Void... params) { MediaPlayer player = MediaPlayer.create(YourActivity.this, R.raw.test_cbr); player.setLooping(true); // Set looping player.setVolume(100,100); player.start(); return null; } }
现在，为了控制音乐，请保存BackgroundSound对象，而不是匿名创建它。将其声明为您活动中的字段：
BackgroundSound mBackgroundSound = new BackgroundSound();
在你的活动的onResume方法上，启动它：
public void onResume() { super.onResume(); mBackgroundSound.execute(null); }
在你的活动的onPause方法中，停止它：
public void onPause() { super.onPause(); mBackgroundSound.cancel(true); }
这样可行。