相关疑难解决方法(0)

我正在尝试检查com.android.music是否正在运行,我在这一行上收到以下错误 this.getSystemService(Context.ACTIVITY_SERVICE);

错误:

对于Listen类型,方法getSystemService(String)是未定义的

码:

public boolean isMusicRunning() {        
    ActivityManager activityManager = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
    for (int i = 0; i < procInfos.size(); i++) {
        if (procInfos.get(i).processName.equals("com.android.music")) {
            Toast.makeText(null, "music is running",
                    Toast.LENGTH_LONG).show();
        }
    }
}

如果你能让我知道我在这里做错了什么就会很棒!