超級動力Android NDK：獲取positionPercent更新音頻進度seekbar

Question

我使用superpoweredAdvancedAudioPlayer在Android上播放mp3。我想在文件播放時使用seekbar來顯示進度。我的計劃是讓玩家一旦使用第二一個Runnable在Java方面的positionPercent屬性，並使用結果更新搜索條。我嘗試了許多不同的方法，但都導致崩潰，無論是使用SIGILL，還是隻在模擬器上發出「不幸，xxx已停止」的通知。 （xxx是應用程序的名稱。）

這是我最近的嘗試。

Java代碼：

private int timeSliderInterval = 1000; // 1 second 
Runnable doUpdateTimeSlider; 
final Handler timeSliderHandler = new Handler(); 

void startUpdateTimeSlider() { 
    doUpdateTimeSlider.run(); 
} 

void stopUpdateTimeSlider() { 
    timeSliderHandler.removeCallbacks(doUpdateTimeSlider); 
} 

@Override 
public void onDestroy() { 
    super.onDestroy(); 
    stopUpdateTimeSlider(); 
} 

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

    doUpdateTimeSlider = new Runnable() { 
     @Override 
     public void run() { 
      updateTimeSlider(); 
      timeSliderHandler.postDelayed(this, timeSliderInterval); 
     } 
     void updateTimeSlider() { 
      float pp; 
      // this is where problems begin! 
      pp = getPositionPercent(); 
      int ppint = (int) (pp*100); 
      timeSlider.setProgress(ppint); 
     } 
    }; 


private native int getPositionPercent(); 

C++代碼：

float SuperpoweredExample::getPositionPercent() { 
    float pp = 0.01f; 
    pp = player1->positionPercent; 
    return pp; } 

extern "C" JNIEXPORT jint Java_org_irthlingz_ChoirherenceA3_PlayActivity_getPositionPercent(JNIEnv * __unused javaEnvironment, jobject __unused obj) { 
    example->getPositionPercent(); 
} 

該應用程序生成並啓動無錯誤。但是當我到達執行SuperpoweredExample::getPositionPercent的地方時，它會崩潰。

Runnable部分本身起作用。但是，只要我嘗試檢索positionPercent，就會發生一種或另一種崩潰。其他

一兩件事：如果我註釋掉轉換爲int和線下它：

  int ppint = (int) (pp*100); 
     timeSlider.setProgress(ppint); 

我仍然獲得了SIGILL。所以這些線路在這一點上不是問題。

有什麼想法？

這裏是一個堆棧跟蹤：

Signal = SIGILL (signal SIGILL: illegal instruction operand) 
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Answer 1

的JNIEXPORT聲明需要 「迴歸」：

return example->getPositionPercent(); 

什麼，而不是我有：

example->getPositionPercent();