android 打印函数调用堆栈

如果是系统应用，则可以直接调用如下方法：

Debug.getCallers(10)

@UnsupportedAppUsage 注释过的方法，只能系统应用才能调用

@UnsupportedAppUsage
    public static String getCallers(final int depth) {
        final StackTraceElement[] callStack = Thread.currentThread().getStackTrace();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < depth; i++) {
            sb.append(getCaller(callStack, i)).append(" ");
        }
        return sb.toString();
    }

非系统应用，则只好用反射方式进行调用了，如下

private fun getCallers(depth:Int): String {
        try{
            val calssName = "android.os.Debug"
            val clazz = Class.forName(calssName)
            val method = clazz.getMethod("getCallers",Int::class.java)
            method.isAccessible = true
            val result = method.invoke(null,depth) as String
            return result
        }catch (e: ClassNotFoundException){
            e.printStackTrace()
            return null.toString()
        }catch (e:NoSuchMethodException){
            e.printStackTrace()
            return null.toString()
        }
    }
}