重写等待框 show（）函数，定位那里调用了该函数

本文链接：https://blog.youkuaiyun.com/zhangxu365/article/details/42964057

本文介绍了如何通过重写公共类中的show()函数并故意制造空指针错误来追踪在代码启动过程中调用等待框show()函数的具体位置。通过使用日志记录框架Logger，可以打印出调用show()函数的父级，帮助开发者快速定位问题。

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重写等待框 show（）函数，定位那里调用了该函数

问题描述：

工程中把等待框写成公共类，很多都在调用show() ，出一个情况，在启动的时候就转圈等待但是又不知道那里代码调用了等待框。

于是重写了 show函数故意制造空指针，程序出错，从打印的错误信息里就看出那里调用了show();

另外：

public static class Logger {
private static final boolean enabled = true;

public static void log(String tag, String prevNote, Object obj, String tailNote) {
if (!enabled) return;
if (null == obj) obj = "null";
if (null == prevNote) prevNote = "";
if (null == tailNote) tailNote = "";

String fullClassName = Thread.currentThread().getStackTrace()[3].getClassName();
String className = fullClassName.substring(fullClassName.lastIndexOf(".") + 1);
String methodName = Thread.currentThread().getStackTrace()[3].getMethodName();
int lineNumber = Thread.currentThread().getStackTrace()[3].getLineNumber();

if (obj.getClass().isArray()) logA(tag, prevNote, (Object[]) obj, "" + tailNote + "; "+ methodName +" <-- " + className + ".java : L" + lineNumber);
else if (obj instanceof List<?>) logL(tag, prevNote, (List<Object>) obj, "" + tailNote +"; "+ methodName +" <-- " + className + ".java : L" + lineNumber);
else log_(tag, prevNote, obj, "" + tailNote + "; "+ methodName +" <-- " + className + ".java : L" + lineNumber);
}

private static void log_(String tag, String prevNote, Object obj, String tailNote) {
if (!enabled) return;
if (null == obj) obj = "null";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(Calendar.getInstance().getTime());
Log.i("" + tag, "" + prevNote + obj.toString() + tailNote + "; <One> time: " + time + "(" + Calendar.getInstance().getTimeInMillis() + ")");
}

private static void logA(String tag, String prevNote, Object[] objs, String tailNote) {
if (!enabled) return;
if (null == objs) objs = new String[] {"null"};
int size = objs.length;
String output = "";
for (int i = 0; i < size; i++) output += objs[i].toString() + "; ";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(Calendar.getInstance().getTime());
Log.i("" + tag, "" + prevNote + output + tailNote + " <Array " + size + "> time: " + time + " (" + Calendar.getInstance().getTimeInMillis() + ")");
}

private static void logL(String tag, String prevNote, List<Object> objs, String tailNote) {
if (!enabled) return;
if (null == objs) {objs = new ArrayList<Object>(); objs.add("null");}
int size = objs.size();
String output = "";
for (int i = 0; i < size; i++) output += objs.get(i).toString() + "; ";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time = sdf.format(Calendar.getInstance().getTime());
Log.i("" + tag, "" + prevNote + output + tailNote + " <List " + size + "> time: " + time + " (" + Calendar.getInstance().getTimeInMillis() + ")");
}
}