伙计我在我的应用程序中处理音频模块，所以我创建了简单的音频演示服务。
它正在努力Play - Pause - Playing in Background，但问题很奇怪。
在启动应用程序时，我添加了两个按钮，如
Play/Pause（将根据州更改字幕）
stop（停止服务）
现在我说我的play-pause & Stop工作正常，但当我点击stop后尝试再次播放音频时会导致问题Start
Error : 05-01 13:37:42.671: E/start(8096): java.lang.IllegalStateException
Audio_Activity.java
public class Audio_Activity extends Activity {
private static final String TAG = "ServicesDemo";
public static Button play_pause;
public static Button buttonStop;
Audio_Service ms;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ms = new Audio_Service();
play_pause = (Button) findViewById(R.id.play_pause);
buttonStop = (Button) findViewById(R.id.buttonStop);
play_pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (isMyServiceRunning()) {
ms.play_pause();
} else {
startService(new Intent(Audio_Activity.this,
Audio_Service.class));
play_pause.setText("Pause");
}
}
});
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (isMyServiceRunning()) {
ms.stop_audio();
stopService(new Intent(Audio_Activity.this,
Audio_Service.class));
play_pause.setText("Play");
} else {
stopService(new Intent(Audio_Activity.this,
Audio_Service.class));
play_pause.setText("Play");
}
}
});
}
public boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service: manager
.getRunningServices(Integer.MAX_VALUE)) {
if (Audio_Service.class.getName().equals(
service.service.getClassName())) {
return true;
}
}
return false;
}
}
Audio_Service.java
public class Audio_Service extends Service implements OnErrorListener,
OnCompletionListener, OnPreparedListener {
public static MediaPlayer player = new MediaPlayer();
Audio_Activity ac = new Audio_Activity();
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show();
}
@Override
public void onDestroy() {
try {
Toast.makeText(this, "My Service Stopped", Toast.LENGTH_LONG)
.show();
} catch (Exception e) {
Log.e("ONdistroy", "" + e);
}
}
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
try {
Log.e("player_status", "" + player);
String url = "MY_WEB_URL";
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.reset();
player.setDataSource(url);
player.prepareAsync();
player.setOnPreparedListener(this);
player.setOnErrorListener(this);
player.setOnCompletionListener(this);
} catch (Exception e) {
// TODO: handle exception
Log.e("start", "" + e);
}
// player.start();
}
public void play_pause() {
try {
if (player != null) {
if (player.isPlaying()) {
ac.play_pause.setText("Play");
player.pause();
} else {
ac.play_pause.setText("Pause");
player.start();
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e("play_pause", "" + e);
}
}
public void stop_audio() {
try {
if (player != null) {
if (player.isPlaying()) {
ac.play_pause.setText("Play");
player.stop();
player.release();
} else {
ac.play_pause.setText("Play");
player.release();
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e("stop_service", "" + e);
}
}
public void cleanUp() {
if (player != null) {
player.stop();
player = null;
player.release();
}
}
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
try {
Log.d("complete", "called...........");
player.stop();
player.release();
player = null;
stopService(new Intent(this, Audio_Service.class));
ac.play_pause.setText("Play");
} catch (Exception e) {
// TODO: handle exception
Log.e("complete", "" + e);
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
try {
player.stop();
player.release();
player = null;
// mp.reset();
ac.play_pause.setText("Play");
} catch (Exception e) {
// TODO: handle exception
Log.e("onError", "" + e);
}
return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
try {
player.start();
} catch (Exception e) {
// TODO: handle exception
Log.e("onPrepare", "" + e);
}
}
}
我在Manifest文件
<uses-permission android:name="android.permission.INTERNET"/>
<service
android:name=".Audio_Service"
android:enabled="true" />
更新
我知道我可以播放理想状态的音频，因为我必须设置reset();但不知道在哪里。因为我设置了onDestroy;或cleanUp()或{{ 1}}或stop_audio()然后再添加一个错误，即onStart()。
请伙计们帮助我。这个错误我在最后两天得到了表格。 如果我错了，请纠正我。
坦克在我的问题上花时间。
答案 0 :(得分：3)
您应该使用startService（）来运行您的服务并使用Binder与它进行通信。它不是一个regualr对象，你需要让Android操作系统知道它，你需要按照它的预期行事。
http://developer.android.com/reference/android/app/Service.html
您不应自己创建实例，也不应直接调用其方法。
答案 1 :(得分：1)
我在5分钟后得到解决方案而且我犯了愚蠢的错误。我忘记添加player = null;
这整个代码完美运行没有任何错误，但开发人员之一（selalerer）也建议我Refer this。我也实现了这种方式，这也很有效。
public void stop_audio() {
try {
if (player != null) {
if (player.isPlaying()) {
ac.play_pause.setText("Play");
player.stop();
player.release();
player = null; // forgot this statement
} else {
ac.play_pause.setText("Play");
player.release();
player = null; // forgot this statement
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e("stop_service", "" + e);
}
}
答案 2 :(得分：0)
你尝试停止播放音频
try {
player.reset();
player.setDataSource(url);
player.prepare();
player.seekTo(0);
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
} catch (SecurityException e1) {
e1.printStackTrace();
} catch (IllegalStateException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
player.start();