Android - MediaPlayer：如何將fastForward分隔到另一個方法（稍後將調用）？

這裏是我的代碼片段：Android - MediaPlayer：如何將fastForward分隔到另一個方法（稍後將調用）？

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()); 
    } 
}

}

按標題，我想分開快進（5尋求每按第二前進）從seekForward.OnClickListener到另一種方法（forwardSong）行爲。

但是，當我觸發seekForward，而不是尋求，它殺死mediaPlayer。所以我必須再次按'播放'按鈕並從歌曲開始處開始。

我錯過了什麼嗎？我很高興收到任何解決方案和/或建議。

ps：請忽略Log語句，我只是在做一些測試之前。

謝謝！

編輯 - 2017年9月8日

按照要求，這裏的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。爲什麼它進入其他語句？

來源

2017-08-08 yuri

發佈您的logcat。 – aborocz

@aborocz Ok補充說。請再次檢查我的帖子。 – yuri

你的logcat是沒有必要的。我的錯。 – 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()); 
    } 
}

以下條件的問題，這將是永遠虛假和mediaplayer永遠追求你的媒體文件的結尾，因爲你的else語句。

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

來源

2017-08-09 12:54:11 aborocz

耶，我也從Log注意到它。但是，爲什麼它進入其他聲明？如果條件有任何建議嗎？或者我必須使用另一種方法，如果條件？ – yuri

我已經發布了if語句的解決方案。 if（currentPosition + seekForwardTime <= mediaPlayer.getDuration（））{' – aborocz

對不起。我沒有注意這一行 – yuri

Android - MediaPlayer：如何將fastForward分隔到另一個方法（稍後將調用）？

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