摘要:
不显示小数点后的0,只显示2位小数 DecimalFormat df = new DecimalFormat(".##"); double num = 450.029000089; System.out.println(df.format(num)); 打印结果:450.03 阅读全文
摘要:
private boolean isForeground() { ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager. 阅读全文