private void doPlayVoice(String voiceSrc) {  
        if (mp == null)  
        {  
            mp = new MediaPlayer().create(MainActivity.this, "dangerous".equalsIgnoreCase(voiceSrc) ? R.raw.dangerous : R.raw.safe);  
        }     
        if (mp.isPlaying())  
        {  
            mp.stop();  
            mp.release();  
            mp = null;    
            mp = new MediaPlayer().create(MainActivity.this, "dangerous".equalsIgnoreCase(voiceSrc) ? R.raw.dangerous : R.raw.safe);
        }  
        try  
        {  
            mp.setOnPreparedListener(new OnPreparedListener() {  
                @Override  
                public void onPrepared(MediaPlayer mp) {  
                    mp.start();  
                }  
            });  
            mp.prepareAsync();  
        } catch (IllegalArgumentException e)  
        {  
            e.printStackTrace();  
        } catch (SecurityException e)  
        {  
            e.printStackTrace();  
        } catch (IllegalStateException e)  
        {  
            e.printStackTrace();  
        } catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
        mp.setOnCompletionListener(new OnCompletionListener() {  
            @Override  
            public void onCompletion(MediaPlayer mp)  
            {  
                /* 因为我本地java的mp对象是定义的全局变量，所以通过类名.this.mp的方式得到我的对象，而非操作onCompletion(MediaPlayer mp)参数传给我的native对象，这样一来，本地java对象就被销毁了，native对象自然也被销毁了 
                 */  
                MainActivity.this.mp.release();  
                MainActivity.this.mp = null;  
            }  
        });  
    }  

转自： https://www.iteye.com/blog/lovelease-2105616