我有一堂课WifiScanning:
public class WifiScanning extends AbstractSetting {
/**
*
*/
private static final long serialVersionUID = 226897434530036069L;
public WifiScanning(Object valueToApply) {
super(valueToApply, WifiScanning.class);
}
/**
* For persistence only
*/
public WifiScanning() {
super(null, WifiScanning.class);
}
如您所见,它有2个构造函数。一个是我的简单持久层,是一个空构造函数,所以newInstance()工作,另一个接受一个参数,这是我的应用程序定义的标准。其他代码假定必须有一个带有单个参数的构造函数,否则会引发异常。
/**
*
* @param setting
* @param ctx
* @return
* @throws SettingException
*/
private synchronized static AbstractSetting getOriginalSetting(AbstractSetting setting,
Context ctx) throws SettingException {
Class<? extends AbstractSetting> clazz = setting.getClass();
try {
Constructor<?>[] constructors = clazz.getDeclaredConstructors();
for (Constructor<?> c : constructors) {
if(c.getParameterTypes().length == 1) {
Object original = setting.getCurrentSettingValue(ctx);
LOG.debug("Caching original value '"+original+"' for "+clazz.getSimpleName());
return (AbstractSetting) c.newInstance(original);
}
}
/*
* ###################### DEBUG BLOCK ######################
*
* This has been put here to work out why we are getting to this point in the code when
* using WifiScanning.java
*/
LOG.error("There are "+constructors.length+" constructors for "+clazz.getName()+" which we got from "+setting);
for (Constructor<?> c : constructors) {
if(c.getParameterTypes().length == 1) {
LOG.debug("Found the consructor! How the hell can that be?");
}
else {
LOG.error("Unusable constructor: "+c.toGenericString());
LOG.error("From: "+c.getDeclaringClass());
LOG.error("Modifiers:");
LOG.error("private="+Modifier.isPrivate(c.getModifiers()));
LOG.error("protected="+Modifier.isProtected(c.getModifiers()));
LOG.error("public="+Modifier.isPublic(c.getModifiers()));
LOG.error("static="+Modifier.isStatic(c.getModifiers()));
Type[] genericParameterTypes = c.getGenericParameterTypes();
LOG.error("Constructor has "+genericParameterTypes.length+" generic parameter types");
for (Type type : genericParameterTypes) {
LOG.error("Generic parameter type: "+type.getClass().getName());
}
Class<?>[] parameterTypes = c.getParameterTypes();
LOG.error("Constructor has "+parameterTypes.length+" parameters");
for (Class<?> arg1 : parameterTypes) {
LOG.error("Constructor arg: "+arg1.getName());
}
}
}
/*
* ###################### END DEBUG BLOCK ######################
*/
throw new SettingException(clazz+" does not have a constructor with a single argument");
如果您考虑上面的代码,则添加DEBUG BLOCK以尝试了解此处发生的情况。如果你暂时忽略它,那么你所拥有的是一段代码块,它从代码中获取构造函数数组并迭代它们,寻找具有单个参数的构造函数。如果循环退出但没有找到,则抛出异常。
使用添加的异常块,日志显示:
E / Proference:10/7 22:28:59.917 e.b [126]:有1个构造函数用于 com.domloge.proference.setting.WifiScanning我们得到了 WifiScanning&#34;测试&#34; [set:true | current:false | priority:1] E / Proference: 10/7 22:28:59.917 e.b [132]:不可用的构造函数:public com.domloge.proference.setting.WifiScanning()V / Proference:清除 日志文件E / Proference:10/7 22:28:59.918 e.b [133]:来自:课堂 com.domloge.proference.setting.WifiScanning E / Proference:10/7 22:28:59.919 e.b [134]:修饰语:E / Proference:10/7 22:28:59.919 e.b [135]:private = false E / Proference:10/7 22:28:59.920 e.b [136]: protected = false E / Proference:10/7 22:28:59.920 e.b [137]:public = true E / Proference:10/7 22:28:59.920 e.b [138]:static = false E / Proference: 10/7 22:28:59.921 e.b [141]:构造函数有0个通用参数类型 E / Proference:10/7 22:28:59.921 e.b [147]:构造函数有0个参数 E / Proference:10/7 22:28:59.922 j.b [270]:无法申请
正如您所看到的,VM显示WifiScanning类正在提供一个构造函数,而不是2.这怎么可能?
当我在我的个人设备和各种模拟器上运行代码时,这不是问题,并且阵列中有2个构造函数。
问题是,当应用通过Google Play商店分发时,该数组包含一个构造函数。我在谷歌Play商店发布应用时无法调试我的应用,我只能查看日志。
这个相同的主体在应用程序中有超过10个其他类正常工作......但是这个正在起作用......好像有一个我错过的拼写错误,这将是一个额头拍打哦!哦!有人指出我愚蠢的错误的那一刻...
有什么想法吗?
答案 0 :(得分:3)
是的,这显然是预言&#34; michief&#34;。
将以下行放在proguard-project.txt
中-keepclassmembers class * extends full-package-name.AbstractSetting {
public protected <init>(...);
}
你会好好的。