按钮点击事件设置媒体播放器音量无效

Question

当我单击按钮设置音量0时，它可以正常工作。但是当我再次点击设置第75卷时，它无效。

btn_sound=(Button)findViewById(R.id.btn_sound);
    btn_sound.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(isMute){
                isMute=false;
                Music.setPlayerVolume(75, 75);
                btn_sound.setBackgroundResource(R.drawable.sound_normal);
            }else {
                isMute=true;
                Music.setPlayerVolume(0, 0);
                btn_sound.setBackgroundResource(R.drawable.sound_silent);
            }
        }
    });

Music.java类：

public class Music {
static MediaPlayer player=null;
public static MediaPlayer getPlayer(Activity activity){
    if(player==null){
        player = MediaPlayer.create(activity, R.raw.bac_music);
    }
    player.setLooping(true);
    player.setVolume(75, 75);
    return player;
}
public static void setPlayerVolume(float a,float b){
    player.setVolume(a,b);
}

}

Answer 1

MediaPlayer.setVolume(float, float)将浮点值从0f变为1f，你应该像这样调用它：

player.setVolume(0.75f, 0.75f);