/**
     * 使用AudioManager控制音量
     * @param value
     * @param context
     * //    https://github.com/lucid-lynxz/BlogSamples/blob/master/VideoViewDemo/app/src/main/java/org/lynxz/videoviewdemo/MainActivity.java
     */
    private void setVoiceVolume(float value,Context context) {
        try {
            AudioManager audioManager=
            (AudioManager)context.getSystemService(Service.AUDIO_SERVICE);
            int
 
 currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
            int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);//(最大值是15)
            int flag = value > 0 ? -1 : 1;
            currentVolume += flag * 0.1 * maxVolume;
            // 對currentVolume進行限制
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume, 0
 
);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }



    /**
     * @param volume 音量大小
     * @param object VideoView例項
     *   ///VideoView 反射 MediaPlayer控制音量 http://blog.csdn.net/u012874222/article/details/73303264
     * 靜音有效果,恢復無效
     * */
    private void setVolume(float
 
 volume,Object object) {
        try {
            Class<?> forName = Class.forName("android.widget.VideoView");
            Field field = forName.getDeclaredField("mMediaPlayer");
            field.setAccessible(true);
            MediaPlayer mMediaPlayer = (MediaPlayer) field.get(object);
            mMediaPlayer.setVolume(volume, volume);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }