Android - MediaPlayer：如何将fastForward分隔到另一个方法（稍后将调用）？

这里是我的代码片段：Android - MediaPlayer：如何将fastForward分隔到另一个方法（稍后将调用）？

public class MainActivity extends AppCompatActivity { 
private int seekForwardTime = 5000; 
private int seekBackwardTime = 5000; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 


    seekForward.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick (View v) { 
      Toast.makeText(getApplicationContext(), "Seek Forward music", Toast.LENGTH_SHORT).show(); 
      forwardSong(mediaPlayer); 
     } 
    }); 
} 

public void forwardSong(MediaPlayer mediaPlayer) { 
    int currentPosition = mediaPlayer.getCurrentPosition(); 
    String tag2 = "currentPosition"; 
    Log.v(tag2, String.valueOf(mediaPlayer.getCurrentPosition())); 
    if (currentPosition + seekForwardTime <= mediaPlayer.getCurrentPosition()) { 
     mediaPlayer.seekTo(currentPosition + seekForwardTime); 
    } else { 
     String tag = "main activity"; 
     Log.v(tag, "else state"); 
     mediaPlayer.seekTo(mediaPlayer.getDuration()); 
    } 
}

}

按标题，我想分开快进（5寻求每按第二前进）从seekForward.OnClickListener到另一种方法（forwardSong）行为。

但是，当我触发seekForward，而不是寻求，它杀死mediaPlayer。所以我必须再次按'播放'按钮并从歌曲开始处开始。

我错过了什么吗？我很高兴收到任何解决方案和/或建议。

ps：请忽略Log语句，我只是在做一些测试之前。

谢谢！

编辑 - 2017年9月8日

按照要求，这里的logcat的

08-09 16:36:01.688 2707-2707/? I/art: Not late-enabling -Xcheck:jni (already on) 
08-09 16:36:01.688 2707-2707/? W/art: Unexpected CPU variant for X86 using defaults: x86 
08-09 16:36:01.781 2707-2707/? W/System: ClassLoader referenced unknown path: /data/app/com.example.android.musicplayer-2/lib/x86 
08-09 16:36:01.791 2707-2707/? I/InstantRun: starting instant run server: is main process 
08-09 16:36:01.856 2707-2707/? W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
08-09 16:36:02.094 2707-2707/com.example.android.musicplayer D/MediaPlayer: setSubtitleAnchor in MediaPlayer 
08-09 16:36:02.189 2707-2730/com.example.android.musicplayer I/OpenGLRenderer: Initialized EGL, version 1.4 
08-09 16:36:02.189 2707-2730/com.example.android.musicplayer D/OpenGLRenderer: Swap behavior 1 
08-09 16:36:02.189 2707-2730/com.example.android.musicplayer W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without... 
08-09 16:36:02.189 2707-2730/com.example.android.musicplayer D/OpenGLRenderer: Swap behavior 0 
08-09 16:36:02.219 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglCreateContext: 0xa1328e80: maj 2 min 0 rcv 2 
08-09 16:36:02.264 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:36:02.333 2707-2707/com.example.android.musicplayer W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView 
08-09 16:36:02.343 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:47.717 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:47.747 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:48.672 2707-2707/com.example.android.musicplayer V/currentPosition: 707 
08-09 16:58:48.673 2707-2707/com.example.android.musicplayer V/main activity: else state 
08-09 16:58:49.669 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:50.684 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:51.667 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20) 
08-09 16:58:53.631 2707-2730/com.example.android.musicplayer D/EGL_emulation: eglMakeCurrent: 0xa1328e80: ver 2 0 (tinfo 0xa1320a20)

我很困惑。为什么它进入其他语句？

来源

2017-08-08 yuri

发布您的logcat。 – aborocz

@aborocz Ok补充说。请再次检查我的帖子。 – yuri

你的logcat是没有必要的。我的错。 – aborocz

修改您forwardSong功能方式如下：

public void forwardSong(MediaPlayer mediaPlayer) { 
    int currentPosition = mediaPlayer.getCurrentPosition(); 
    String tag2 = "currentPosition"; 
    Log.v(tag2, String.valueOf(mediaPlayer.getCurrentPosition())); 
    if (currentPosition + seekForwardTime <= mediaPlayer.getDuration()) { 
     mediaPlayer.seekTo(currentPosition + seekForwardTime); 
    } else { 
     String tag = "main activity"; 
     Log.v(tag, "else state"); 
     mediaPlayer.seekTo(mediaPlayer.getDuration()); 
    } 
}

以下条件的问题，这将是永远虚假和mediaplayer永远追求你的媒体文件的结尾，因为你的else语句。

if (currentPosition + seekForwardTime <= mediaPlayer.getCurrentPosition())

来源

2017-08-09 12:54:11 aborocz

耶，我也从Log注意到它。但是，为什么它进入其他声明？如果条件有任何建议吗？或者我必须使用另一种方法，如果条件？ – yuri

我已经发布了if语句的解决方案。 if（currentPosition + seekForwardTime <= mediaPlayer.getDuration（））{' – aborocz

对不起。我没有注意这一行 – yuri

Android - MediaPlayer：如何将fastForward分隔到另一个方法（稍后将调用）？

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