所以我在这里创建一个音乐服务类
public class MusicService extends Service implements MediaPlayer.OnErrorListener {
private final IBinder mBinder = new ServiceBinder();
MediaPlayer mPlayer;
private int length = 0;
public MusicService() {
}
public class ServiceBinder extends Binder {
MusicService getService() {
return MusicService.this;
}
}
@Override
public IBinder onBind(Intent arg0) {
return mBinder;
}
@Override
public void onCreate() {
super.onCreate();
mPlayer = MediaPlayer.create(this, R.raw.game_music);
mPlayer.setOnErrorListener(this);
if (mPlayer != null) {
mPlayer.setLooping(true);
mPlayer.setVolume(100, 100);
}
mPlayer.setOnErrorListener(new OnErrorListener() {
public boolean onError(MediaPlayer mp, int what, int
extra) {
onError(mPlayer, what, extra);
return true;
}
});
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mPlayer.start();
return START_STICKY;
}
public void pauseMusic() {
if (mPlayer.isPlaying()) {
mPlayer.pause();
length = mPlayer.getCurrentPosition();
}
}
public void resumeMusic() {
if (mPlayer.isPlaying() == false) {
mPlayer.seekTo(length);
mPlayer.start();
}
}
public void stopMusic() {
mPlayer.stop();
mPlayer.release();
mPlayer = null;
}
@Override
public void onDestroy() {
super.onDestroy();
if (mPlayer != null) {
try {
mPlayer.stop();
mPlayer.release();
} finally {
mPlayer = null;
}
}
}
public boolean onError(MediaPlayer mp, int what, int extra) {
Toast.makeText(this, "music player failed", Toast.LENGTH_SHORT).show();
if (mPlayer != null) {
try {
mPlayer.stop();
mPlayer.release();
} finally {
mPlayer = null;
}
}
return false;
}
}
然后,在我的主要游戏 Activity 中,我以
开始代码public class Gameview extends AppCompatActivity {
/**
* Whether or not the system UI should be auto-hidden after
* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.
*/
private boolean mIsBound = false;
private MusicService mServ;
private ServiceConnection Scon =new ServiceConnection(){
public void onServiceConnected(ComponentName name, IBinder
binder) {
/*mServ = ((MusicService.ServiceBinder binder).getService());*/
MusicService.ServiceBinder sb = (MusicService.ServiceBinder) binder;
mServ = sb.getService();
}
public void onServiceDisconnected(ComponentName name) {
mServ = null;
}
};
void doBindService(){
bindService(new Intent(this,MusicService.class),
Scon, Context.BIND_AUTO_CREATE);
mIsBound = true;
}
void doUnbindService()
{
if(mIsBound)
{
unbindService(Scon);
mIsBound = false;
}
}
然后,在主游戏 Activity onCreate 中,我将服务绑定(bind)到 Activity
doBindService();
Intent music = new Intent();
music.setClass(this,MusicService.class);
startService(music);
现在,游戏的工作原理是允许用户点击行星,当他们这样做时,它会将他们重定向到带有行星图片的不同 Activity 。就目前而言,当用户单击行星然后返回到创建它的 Activity 时,音乐将继续播放并在游戏中循环播放(因此这部分工作完美)。我的问题是这样的:我想让音乐在用户点击星球时暂停或降低音量,并在返回主游戏 View 时恢复正常。我的问题是我不知道如何从这些行星 View 继承我的 MusicService 对象以便操纵它。我尝试搞乱行星的 onCreate 之类的东西,但没有运气
MusicService.ServiceBinder sb = (MusicService.ServiceBinder) binder;
mServ = sb.getService()
如何在游戏的主要 Activity 之外操作我的 MusicService 对象???
最佳答案
public
和 static
修饰符使对象或变量可以从其他类中使用。
只需将 MusicService
对象声明为 public static
,并在 Planet Activity 的 onCreate
方法中调用它即可。
希望对你有帮助!
关于java - 在整个 Activity 过程中改变音量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60742141/