我正在使用IntentService作为背景音乐。它不适用于7.1以上（牛轧糖）设备。我想在背景上播放音乐，还可以控制播放，暂停和停止应用程序类的操作。我的代码是......
申请类......
public class App extends Application {
private Intent intent;
@Override
public void onCreate() {
super.onCreate();
OneSignal.setLogLevel(OneSignal.LOG_LEVEL.DEBUG, OneSignal.LOG_LEVEL.NONE);
OneSignal.startInit(this)
.inFocusDisplaying(OneSignal.OSInFocusDisplayOption.None)
.setNotificationReceivedHandler(new OneSignalNotificationReceivedHandler())
.setNotificationOpenedHandler(new OneSignalNotificationOpenedHandler(getApplicationContext()))
.init();
registerActivityLifecycleCallbacks(new MyActivityLifecycleCallbacks());
intent = new Intent(App.this, BgSoundIntentServices.class);
intent.setAction("");
startService(intent);
}
private class MyActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {
private int numStarted = 0;
public void onActivityCreated(Activity activity, Bundle bundle) {
Log.e("APP",String.valueOf(appPrefDetails.getGameSound()));
Log.e("APP",String.valueOf(activity.getLocalClassName()+" onActivityCreated"));
if (appPrefDetails.getSound() && intent!=null) {
if (activity.getLocalClassName().equalsIgnoreCase("Class1")) {
intent.setAction(BgSoundIntentServices.ACTION_PLAY);
startService(intent);
}
}
}
public void onActivityDestroyed(Activity activity) {
}public void onActivityPaused(Activity activity) {
}public void onActivityResumed(Activity activity) {
}
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
public void onActivityStarted(Activity activity) {
}
public void onActivityStopped(Activity activity) {
}
}
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}
}
我的宣言文件..
<service
android:name="com.example.music.sample.BgSoundIntentServices">
</service>
BgSoundIntentServices calss ...
public class BgSoundIntentServices extends IntentService {
public static final String ACTION_PLAY = "com.example.music.action.ACTION_PLAY";
public static final String ACTION_PAUSE = "com.example.music.action.ACTION_PAUSE";
public static final String ACTION_FORCE_PAUSE = "com.example.music.action.ACTION_FORCE_PAUSE";
public static final String ACTION_RESUME_PLAY = "com.example.music.action.ACTION_RESUME_PLAY";
public static final String ACTION_STOP = "com.example.music.action.ACTION_STOP";
public static final String ACTION_STOP_SERVICE = "com.example.music.action.STOP_SERVICE";
private MediaPlayer player;
private AudioManager audioManager;
private Handler fadeOutHandler;
private Handler fadeInHandler;
private boolean FORCE_PAUSE;
// private SharedPreferences pref;
private AppPrefDetails prefDetails;
public BgSoundIntentServices() {
super(null);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
// System.out.println("ACTIVITY_CREATE " + intent.getAction());
}
@Override
public int onStartCommand(@Nullable Intent intent, int flags, int startId) {
if (prefDetails==null){
prefDetails=new AppPrefDetails(this);
}
if (intent != null && intent.getAction() != null) {
String intentAction = intent.getAction();
switch (intentAction) {
case ACTION_PLAY:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_PLAY"));
if (player == null) {
requestAudioFocusForMyApp(this);
player = MediaPlayer.create(this, R.raw.app_bg);
player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
Play();
player.setLooping(true);
}
});
}else {
Play();
}
break;
case ACTION_PAUSE:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_PAUSE"));
Pause();
break;
case ACTION_FORCE_PAUSE:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_FORCE_PAUSE"));
ForcePause();
break;
case ACTION_RESUME_PLAY:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_RESUME_PLAY"));
ResumePlay();
break;
case ACTION_STOP:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_STOP"));
StopPlayer();
break;
case ACTION_STOP_SERVICE:
Log.e("APP",String.valueOf("onStartCommand"+" ACTION_STOP_SERVICE"));
StopService(intent);
break;
}
}
return START_STICKY;
}
public void Play() {
if (player != null && requestAudioFocusForMyApp(this)) {
Log.e("APP",String.valueOf("onStartCommand"+" Play"));
// player.start();
FadeIn(player, 1000);
FORCE_PAUSE = false;
}
}
public void Pause() {
if (player != null) {
Log.e("APP",String.valueOf("onStartCommand"+" Pause"));
FadeOut(player, 1000);
// player.pause();
FORCE_PAUSE = false;
}
}
public void ForcePause() {
if (fadeInHandler != null) {
fadeInHandler.removeCallbacksAndMessages(null);
fadeInHandler = null;
}
if (fadeOutHandler != null) {
fadeOutHandler.removeCallbacksAndMessages(null);
fadeOutHandler = null;
}
Log.e("APP",String.valueOf("onStartCommand"+" ForcePause"));
player.pause();
FORCE_PAUSE = true;
}
public void ResumePlay() {
if (fadeInHandler != null) {
fadeInHandler.removeCallbacksAndMessages(null);
fadeInHandler = null;
}
if (fadeOutHandler != null) {
fadeOutHandler.removeCallbacksAndMessages(null);
fadeOutHandler = null;
}
if (player != null && FORCE_PAUSE) {
Log.e("APP",String.valueOf("onStartCommand"+" ResumePlay"));
// player.start();
if (player.isPlaying()){
player.pause();
}
FadeIn(player, 1000);
FORCE_PAUSE = false;
}
}
public void StopPlayer() {
if (player != null) {
if (player.isPlaying()) {
Log.e("APP",String.valueOf("onStartCommand"+" StopPlayer"));
player.stop();
player.release();
player = null;
} else {
Log.e("APP",String.valueOf("onStartCommand"+" StopPlayerRelease"));
player.release();
player = null;
}
}
releaseAudioFocusForMyApp(this);
}
public void StopService(Intent intent) {
Log.e("APP",String.valueOf("onStartCommand"+" StopService"));
if (fadeInHandler != null) {
fadeInHandler.removeCallbacksAndMessages(null);
fadeInHandler = null;
}
if (fadeOutHandler != null) {
fadeOutHandler.removeCallbacksAndMessages(null);
fadeOutHandler = null;
}
stopService(intent);
releaseAudioFocusForMyApp(this);
}
public void FadeOut(final MediaPlayer player, final int duration) {
final float deviceVolume = getDeviceVolume();
if (fadeOutHandler != null) {
fadeOutHandler.removeCallbacksAndMessages(null);
fadeOutHandler = null;
}
if (fadeInHandler != null) {
fadeInHandler.removeCallbacksAndMessages(null);
fadeInHandler = null;
}
fadeOutHandler = new Handler();
fadeOutHandler.postDelayed(new Runnable() {
private float time = duration;
private float volume = 0.0f;
@Override
public void run() {
if (!player.isPlaying())
player.start();
// can call h again after work!
time -= 100;
volume = (deviceVolume * time) / duration;
player.setVolume(volume, volume);
if (time > 0)
fadeOutHandler.postDelayed(this, 100);
else {
player.pause();
// _player.release();
fadeOutHandler.removeCallbacksAndMessages(null);
}
}
}, 100); // 1 second delay (takes millis)
}
public void FadeIn(final MediaPlayer player, final int duration) {
final float deviceVolume = getDeviceVolume();
if (fadeInHandler != null) {
fadeInHandler.removeCallbacksAndMessages(null);
fadeInHandler = null;
}
if (fadeOutHandler != null) {
fadeOutHandler.removeCallbacksAndMessages(null);
fadeOutHandler = null;
}
fadeInHandler = new Handler();
fadeInHandler.postDelayed(new Runnable() {
private float time = 0.0f;
private float volume = 0.0f;
@Override
public void run() {
if (!player.isPlaying())
player.start();
// can call h again after work!
time += 100;
volume = (deviceVolume * time) / duration;
player.setVolume(volume, volume);
if (time < duration) {
fadeInHandler.postDelayed(this, 100);
} else {
fadeInHandler.removeCallbacksAndMessages(null);
}
}
}, 100); // 1 second delay (takes millis)
}
public float getDeviceVolume() {
int volumeLevel = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
return (float) volumeLevel / maxVolume;
}
AudioManager.OnAudioFocusChangeListener focusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_GAIN: //RETURN TO CUT THE CALL
// Log.i("AUDIOFOCUS", "AUDIOFOCUS_GAIN");
if (prefDetails.getSound() && player != null && !App.AppIsBackground() && FORCE_PAUSE) {
ResumePlay();
}
break;
case AudioManager.AUDIOFOCUS_LOSS: //OTHER MEDIYA FOCUS
// Log.e("AUDIOFOCUS", "AUDIOFOCUS_LOSS");
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT: //CALL FOCUS
// Log.e("AUDIOFOCUS", "AUDIOFOCUS_LOSS_TRANSIENT");
if (prefDetails.getSound() && player != null && !App.AppIsBackground()) {
ForcePause();
}
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
// Log.e("AUDIOFOCUS", "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
// Lower the volume
break;
case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
// Log.i("AUDIOFOCUS", "AUDIOFOCUS_GAIN_TRANSIENT");
break;
case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
// Log.i("AUDIOFOCUS", "AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK");
// Play over existing audio
break;
}
}
};
private boolean requestAudioFocusForMyApp(Context context) {
audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
// Request audio focus for playback
int result = audioManager.requestAudioFocus(focusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
return true;
} else {
return false;
}
}
void releaseAudioFocusForMyApp(final Context context) {
AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
am.abandonAudioFocus(focusChangeListener);
}
}
当我获得调试构建它显示以下错误时，应用程序未打开，它显示应用程序没有响应..
06-06 16:15:34.546 1772-1787/? E/ActivityManager: ANR in com.example.music
PID: 14500
Reason: executing service com.example.music/.sample.BgSoundIntentServices
Load: 5.74 / 5.4 / 5.26
CPU usage from 92145ms to 0ms ago (2018-06-06 16:13:59.644 to 2018-06-06 16:15:31.789):
22% 1772/system_server: 13% user + 8.4% kernel / faults: 62105 minor 2 major
3.7% 559/surfaceflinger: 1.7% user + 2% kernel / faults: 509 minor
2.8% 3576/com.google.android.gms: 2.1% user + 0.7% kernel / faults: 12127 minor 37 major
2.8% 456/logd: 1.1% user + 1.7% kernel / faults: 194 minor
2.2% 3170/com.google.android.gms.persistent: 1.6% user + 0.5% kernel / faults: 6125 minor 13 major
1.6% 14698/adbd: 0.5% user + 1.1% kernel / faults: 6005 minor
1% 1436/mediaserver: 0.7% user + 0.3% kernel / faults: 49 minor
1% 9989/kworker/u16:3: 0% user + 1% kernel
0.4% 31702/com.android.vending: 0.3% user + 0.1% kernel / faults: 9114 minor 2 major
0.9% 2599/com.android.systemui: 0.7% user + 0.1% kernel / faults: 3251 minor 1 major
0.8% 11841/kworker/u16:4: 0% user + 0.8% kernel
0.8% 358/mmc-cmdqd/0: 0% user + 0.8% kernel
0.6% 10236/kworker/u16:8: 0% user + 0.6% kernel
0.5% 540/healthd: 0% user + 0.5% kernel / faults: 1 minor
0.5% 9914/logcat: 0.3% user + 0.1% kernel / faults: 40 minor
0.4% 3356/com.miui.whetstone: 0.3% user + 0.1% kernel / faults: 962 minor 2 major
0.3% 699/jbd2/dm-1-8: 0% user + 0.3% kernel
0.4% 1437/netd: 0.1% user + 0.3% kernel / faults: 3666 minor
0.1% 1432/zygote64: 0% user + 0.1% kernel / faults: 4816 minor
0.3% 3435/com.miui.home: 0.2% user + 0% kernel / faults: 3933 minor
0.4% 3453/com.miui.securitycenter.remote: 0.3% user + 0% kernel / faults: 3454 minor 2 major
0.4% 2880/com.android.phone: 0.2% user + 0.1% kernel / faults: 726 minor 1 major
0.3% 12250/kworker/u16:2: 0% user + 0.3% kernel
0.3% 7479/mdss_fb0: 0% user + 0.3% kernel
0.3% 8667/com.microsoft.office.outlook: 0.1% user + 0.1% kernel / faults: 1031 minor 1 major
0.3% 558/servicemanager: 0.1% user + 0.1% kernel / faults: 47 minor
0.2% 3862/com.miui.powerkeeper:service: 0.1% user + 0.1% kernel / faults: 878 minor 3 major
0.2% 17441/com.xiaomi.discover: 0.2% user + 0% kernel / faults: 4426 minor
0.1% 109/system: 0% user + 0.1% kernel
0% 177/kswapd0: 0% user + 0% kernel
0.2% 877/msm_irqbalance: 0% user + 0.2% kernel / faults: 45 minor
0% 15941/com.lenovo.anyshare.gps:mobi: 0% user + 0% kernel / faults: 1659 minor 7 major
0.1% 346/cfinteractive: 0% user + 0.1% kernel
0% 12503/kworker/4:0: 0% user + 0% kernel
0.1% 7/rcu_preempt: 0% user + 0.1% kernel
0.1% 39/rcuop/4: 0% user + 0.1% kernel
0% 1433/zygote: 0% user + 0% kernel / faults: 2177 minor
0.1% 29599/VosTXThread: 0% user + 0.1% kernel
0.1% 422/ueventd: 0.1% user + 0% kernel
0.1% 53/rcuop/6: 0% user + 0.1% kernel
0.1% 10/rcuop/0: 0% user + 0.1% kernel
0.1% 3304/com.miui.daemon: 0% user + 0% kernel / faults: 450 minor
0.1% 36/ksoftirqd/4: 0% user + 0.1% kernel
0.1% 557/lmkd: 0% user + 0.1% kernel / faults: 25 minor
0% 3757/com.lbe.security.miui: 0% user + 0% kernel / faults: 1300 minor
0.1% 12977/kworker/5:1: 0% user + 0.1% kernel
0.1% 29600/VosRXThread: 0% user + 0.1% kernel
0.1% 13010/kworker/0:0: 0% user + 0.1% kernel
0% 46/rcuop/5: 0% user + 0% kernel
0% 25/rcuop/2: 0% user + 0% kernel
0% 740/rild: 0% user + 0% kernel / faults: 534 minor
0% 3087/mcd: 0% user + 0% kernel / faults: 32 minor
0% 3/ksoftirqd/0: 0% user + 0% kernel
0% 8/rcu_sched: 0% user + 0% kernel
0% 43/ksoftirqd/5: 0% user + 0% kernel
0% 3149/com.xiaomi.xmsf: 0% user + 0% kernel / faults: 482 minor
0% 29607/wpa_supplicant: 0% user + 0% kernel / faults: 33 minor
0% 18/rcuop/1: 0% user + 0% kernel
0% 50/ksoftirqd/6: 0% user + 0% kernel
0% 60/rcuop/7: 0% user + 0% kernel
0% 210/hwrng: 0% user + 0% kernel
0% 543/rmt_storage: 0% user + 0% kernel / faults: 38 minor
0% 1434/audioserver: 0% user + 0% kernel / faults: 96 minor
0% 2860/.dataservices: 0% user + 0% kernel / faults: 163 minor
0% 3106/irq/180-408000.: 0% user + 0% kernel
0% 1142
请有人帮帮我..
提前谢谢..
答案 0 :(得分：1)
感谢错误将得到解决，
错误是，应用程序类正在创建多次，因此意图将创建多次，因此仅显示此ANR错误。
现在只是在创建之前检查意图是否等于null，其工作正常。
喜欢
if(intent==null){
intent = new Intent(App.this, BgSoundIntentServices.class);
intent.setAction("");
startService(intent);
}
它为我工作。
谢谢。