在本文中,您将会了解到关于java-Firebase,classmaper:在类“myclass”上找不到“UserTwo”的设置器/字段的新资讯,同时我们还将为您解释java报错找不到类的相关在本文
在本文中,您将会了解到关于java-Firebase,classmaper:在类“ myclass”上找不到“ UserTwo”的设置器/字段的新资讯,同时我们还将为您解释java报错找不到类的相关在本文中,我们将带你探索java-Firebase,classmaper:在类“ myclass”上找不到“ UserTwo”的设置器/字段的奥秘,分析java报错找不到类的特点,并给出一些关于'java.lang.NoClassDefFoundError 由 java.lang.ClassNotFoundException 引起的 Ljava/util/Base64 解析失败 未找到类“java.util.Base64”、android – com.google.firebase.provider.FirebaseInitProvider:java.lang.ClassNotFoundException:com.g、android – dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)中的类加载错误?、android – NoClassDefFoundError:com.google.firebase.FirebaseOptions的实用技巧。
本文目录一览:- java-Firebase,classmaper:在类“ myclass”上找不到“ UserTwo”的设置器/字段(java报错找不到类)
- 'java.lang.NoClassDefFoundError 由 java.lang.ClassNotFoundException 引起的 Ljava/util/Base64 解析失败 未找到类“java.util.Base64”
- android – com.google.firebase.provider.FirebaseInitProvider:java.lang.ClassNotFoundException:com.g
- android – dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)中的类加载错误?
- android – NoClassDefFoundError:com.google.firebase.FirebaseOptions
java-Firebase,classmaper:在类“ myclass”上找不到“ UserTwo”的设置器/字段(java报错找不到类)
所以firebase一直给我null指针异常,并且它在类’ChatModel’上找不到任何设置器/字段,这是我的chatModel类:
package edusolution.matrimony;
import java.util.HashMap;
import java.util.Map;
/**
* Created by el on 8/26/16.
*/
public class ChatModel
{
public Map<String,Object> message = new HashMap<>();
public String foruser;
public String foruserAnother;
public ChatModel()
{
}
public ChatModel(String foruser,String foruserAnother)
{
this.foruser = foruser;
this.foruserAnother = foruserAnother;
}
public String getForuser()
{
return foruser;
}
public void setForuser(String foruser)
{
this.foruser = foruser;
}
public String getForuserAnother()
{
return foruserAnother;
}
public void setForuserAnother(String foruserAnother)
{
this.foruserAnother = foruserAnother;
}
public Map<String, Object> getMessage()
{
return message;
}
public void setMessage(Map<String,Object> message)
{
this.message = message;
}
public Map<String,Object> toMap()
{
HashMap<String,Object> result = new HashMap<>();
message.put("somebody","iusedtokNow");
result.put("UserOne",foruser);
result.put("UserTwo",foruserAnother);
result.put("Messages",message);
return result;
}
}
附言:我尝试将字段设为私有,但所有方法均无效,这是我在数据库中创建chatmodel的方式:
private void createChatModel (String Name,String currentUserName)
{
DatabaseReference database = FirebaseDatabase.getInstance().getReference();
String Key = FirebaseDatabase.getInstance().getReference().child("chatRooms").push().getKey();
ChatModel chat = new ChatModel(Name,currentUserName);
Map<String,Object> postValues = chat.toMap();
Map<String,Object> childUpdates = new HashMap<>();
childUpdates.put("/chatRooms/"+Key,postValues);
database.updateChildren(childUpdates);
}
最后是我如何获取这些数据:
public void setupChat(final String username)
{
//check if chat room is already exists or not
databaseReference.child("chatRooms").addValueEventListener(new ValueEventListener()
{
public void onDataChange(DataSnapshot dataSnapshot)
{
for(DataSnapshot s : dataSnapshot.getChildren())
{
ChatModel chat = s.getValue(ChatModel.class);
if(chat != null )
{
Log.d("Key and hash : ",s.getKey()+" "+chat.getMessage().get(0));
if (chat.getForuser().equals(auth.getCurrentUser().getUid()) && chat.getForuserAnother().equals(username))
{
Log.d("Chat is ", s.getKey());
RoomName = new String(s.getKey());
ChatEnabled = true;
}
else if (chat.getForuser().equals(username) && chat.getForuserAnother().equals(auth.getCurrentUser().getUid()))
{
Log.d("chat is also ", s.getKey());
RoomName = new String(s.getKey());
ChatEnabled = true;
}
else
{
Log.d("No chat : ", "creating chat");
}
}
}
}
public void onCancelled(DatabaseError databaseError)
{
Toast.makeText(getApplicationContext(),"Unable to retrieve data",Toast.LENGTH_LONG).show();
}
});
}
示例数据,保存在firebasedatabase中,图片:Saved data image example
最后错误,我得到eveytime:
08-28 18:28:51.005 31762-31762/edusolution.matrimony W/ClassMapper: No setter/field for UserTwo found on class edusolution.matrimony.ChatModel
08-28 18:28:51.005 31762-31762/edusolution.matrimony W/ClassMapper: No setter/field for Messages found on class edusolution.matrimony.ChatModel
08-28 18:28:51.005 31762-31762/edusolution.matrimony W/ClassMapper: No setter/field for UserOne found on class edusolution.matrimony.ChatModel
08-28 18:28:51.005 31762-31762/edusolution.matrimony D/Key and hash :: -KQGYLHb2IQ34AHkzx5G null
08-28 18:28:51.005 31762-31762/edusolution.matrimony D/AndroidRuntime: Shutting down VM
08-28 18:28:51.005 31762-31762/edusolution.matrimony W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41919700)
08-28 18:28:51.012 31762-31762/edusolution.matrimony E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerExceptio
at edusolution.matrimony.Chat$1.onDataChange(Chat.java:70)
at com.google.android.gms.internal.zzaie.zza(UnkNown Source)
at com.google.android.gms.internal.zzaje.zzcta(UnkNown Source)
at com.google.android.gms.internal.zzajh$1.run(UnkNown Source)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
解决方法:
POJO类与数据库的结构不同.
将您的ChatModel类字段更改为
public class ChatModel {
public Map<String,Object> Messages = new HashMap<>();
public String UserOne;
public String UserTwo;
// constructor
// setter and getter
}
'java.lang.NoClassDefFoundError 由 java.lang.ClassNotFoundException 引起的 Ljava/util/Base64 解析失败 未找到类“java.util.Base64”
如何解决''java.lang.NoClassDefFoundError 由 java.lang.ClassNotFoundException 引起的 Ljava/util/Base64 解析失败 未找到类“java.util.Base64”?
我收到此错误,我已阅读该错误以解决它我必须将 import java.util.Base64
替换为 import android.util.Base64
但在我的整个项目中我只发现 Base68 result = Base64.getEncoder().encodetoString(macData);
的唯一用法
我该如何解决?而且我不能用 android.util.Base.64 替换 java.util.Base64 因为这行代码在后端
解决方法
这很不幸 - 这意味着您正在使用某个库,而那个库正在尝试使用 /i
。 Android 选择了 Java 库,就像 android 发布时一样,现在已经是很久以前的事了。从那以后它们就没有真正更新过。 (那个 oracle v google 法庭案件可能没有帮助……)
java.util.Base64
已添加到 https://forge.autodesk.com/en/docs/design-automation/v3/reference/cmdLine/cmdLine-inventor/(有关此信息,请参阅 javadoc 中的“since”行;任何“1.6”或以下,或者如果没有“since”行,肯定可用在 android 上。其他东西通常不是)。 java 8 现在已经 7 岁了,因此不是专门为 android 设计的库越来越有可能开始使用这些非 android 库调用。
检查堆栈跟踪,您会找到正在执行此操作的库。恐怕除了停止使用这个库之外别无他法。您可以尝试在您的应用程序中粘贴 juBase64 impl,但这会相对棘手,因为这可能涉及一些法律问题,因此,要么没有人这样做,要么如果他们这样做,他们可能不会宣传如何。
您可以要求这个库使用第三方库来做 base64 工作,但他们可能不想这样做,这可能不是库无法在 android 上运行的唯一问题。
如果 android 变体是一个替代品,你可以重写这个库的类文件,但这也是一个有点笨拙、笨拙的概念,并不完全困难,但因为这不是一件正常的事情,而且通常积极不喜欢,我认为您无法轻松找到有关如何操作的文档。
因此,建议:尝试寻找另一个图书馆。
android – com.google.firebase.provider.FirebaseInitProvider:java.lang.ClassNotFoundException:com.g
在KitKat和更低版本上接收此错误在Lollipop及以上版本上完美运行
我已将所有必需的jar包括在gradle和Firebase json文件中以接收GCM.
我的应用程序gradle
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 23
buildToolsversion "24.0.0"
defaultConfig {
applicationId ""
minSdkVersion 13
targetSdkVersion 23
versionCode 6
versionName "1.6"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
defaultConfig {
multiDexEnabled true
}
useLibrary 'org.apache.http.legacy'
}
dependencies {
compile filetree(dir: 'libs', include: ['*.jar'])
compile project(':httpmime-4.2.5')
compile project(':universal-image-loader-1.9.3')
compile project(':universal-image-loader-1.9.3')
compile group: 'org.apache.httpcomponents', name: 'httpclient-android', version: '4.3.3'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.loopj.android:android-async-http:1.4.9'
compile 'com.readystatesoftware.sqliteasset:sqliteassethelper:+'
compile 'com.android.support:design:23.4.0'
compile 'com.google.android.gms:play-services:9.0.0'
testCompile 'junit:junit:4.12'
}
解决方法:
此依赖项包括所有Google Play服务API的代码:
compile 'com.google.android.gms:play-services:9.0.0'
这很可能导致您的应用超过65K方法参考限制,要求您使用Multidex在Lollipop前设备上运行.
你有两个选择.您只能包含实际需要的Play服务API.标题为选择性地将API编译到可执行文件中的部分中的list is here.或者您可以在instructions here之后启用Multidex.尽管build.gradle文件中的multiDexEnabled为true,但这只是配置Multidex所需的三个步骤之一.您还需要将库包含为依赖项并更新清单.
如果您使用的是Android Studio 2.2.2,则可以使用APK Analyzer查看应用中有多少方法引用.从菜单栏中选择Build>分析APK. APK位于文件夹… / app / build / outputs / apk中.选择APK文件,然后在结果窗口中单击classes.dex以查看方法和方法引用的数量.
android – dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)中的类加载错误?
AndroidManifest.xml中:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.extremefitness.org" android:versionCode="1" android:versionName="1.0" > <supports-screens android:anyDensity="false" android:largeScreens="true" android:normalScreens="true" android:smallScreens="true" android:xlargeScreens="true" /> <uses-permission android:name="android.permission.INTERNET" > </uses-permission> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" > </uses-permission> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" > </uses-permission> <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" /> <uses-permission android:name="android.permission.CLEAR_APP_CACHE" > </uses-permission> <uses-permission android:name="android.permission.disABLE_KEyguard" /> <uses-permission android:name="android.permission.WAKE_LOCK" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".Tabbaractivity" android:windowSoftInputMode="adjustPan|adjustResize" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".HomeActivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.LoginActivity" android:noHistory="true" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.Registeractivity" android:noHistory="true" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.Profiletabactivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.RandomWorkouttabactivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.Tracktabactivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.Workouttabactivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.StatsActivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.ExerciseActivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.CustomDialog" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.WorkoutDescription" android:noHistory="true" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.ExerciseDescription" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.Settings" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.RandomWorkoutResponse" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name=".FBActivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name=".Twitteractivity" android:screenorientation="portrait" android:windowSoftInputMode="adjustPan|adjustResize" > </activity> <activity android:name="com.extremefitness.views.VideoDialog" android:configChanges="orientation|screenSize|keyboardHidden" android:screenorientation="nosensor" > <Meta-data android:name="@string/minVersion" android:value="8" /> <Meta-data android:name="@string/isLaunchableActivity" android:value="true" /> </activity> <activity android:name="com.extremefitness.views.WorktVideoDialog" android:configChanges="orientation|screenSize|keyboardHidden" android:screenorientation="nosensor" > <Meta-data android:name="@string/minVersion" android:value="8" /> <Meta-data android:name="@string/isLaunchableActivity" android:value="true" /> </activity> </application> </manifest>
错误的日志:
04-26 14:45:08.211: E/AndroidRuntime(2179): FATAL EXCEPTION: main 04-26 14:45:08.211: E/AndroidRuntime(2179): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.extremefitness.org/com.extremefitness.org.Tabbaractivity}: java.lang.classNotFoundException: com.extremefitness.org.Tabbaractivity 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1894) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread.access$600(ActivityThread.java:128) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.os.Handler.dispatchMessage(Handler.java:99) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.os.Looper.loop(Looper.java:137) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread.main(ActivityThread.java:4517) 04-26 14:45:08.211: E/AndroidRuntime(2179): at java.lang.reflect.Method.invokeNative(Native Method) 04-26 14:45:08.211: E/AndroidRuntime(2179): at java.lang.reflect.Method.invoke(Method.java:511) 04-26 14:45:08.211: E/AndroidRuntime(2179): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993) 04-26 14:45:08.211: E/AndroidRuntime(2179): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760) 04-26 14:45:08.211: E/AndroidRuntime(2179): at dalvik.system.NativeStart.main(Native Method) 04-26 14:45:08.211: E/AndroidRuntime(2179): Caused by: java.lang.classNotFoundException: com.extremefitness.org.Tabbaractivity 04-26 14:45:08.211: E/AndroidRuntime(2179): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) 04-26 14:45:08.211: E/AndroidRuntime(2179): at java.lang.classLoader.loadClass(ClassLoader.java:501) 04-26 14:45:08.211: E/AndroidRuntime(2179): at java.lang.classLoader.loadClass(ClassLoader.java:461) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.Instrumentation.newActivity(Instrumentation.java:1027) 04-26 14:45:08.211: E/AndroidRuntime(2179): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1885) 04-26 14:45:08.211: E/AndroidRuntime(2179): ... 11 more
解决方法
android – NoClassDefFoundError:com.google.firebase.FirebaseOptions
我尝试了我已经搜索的解决方案,没有什么似乎有效.
我正在使用Firebase实时数据库.有人可以帮忙吗?
这是错误日志:
06-03 01:36:29.607 2655-2655/mobapps.mypersonal.biz.grouptracker E/dalvikvm: Could not find class 'com.google.firebase.FirebaSEOptions',referenced from method com.google.firebase.FirebaseApp.<init> 06-03 01:36:29.617 2655-2655/mobapps.mypersonal.biz.grouptracker E/dalvikvm: Could not find class 'com.google.firebase.FirebaseApp$zzb',referenced from method com.google.firebase.FirebaseApp.zzaJ 06-03 01:36:29.621 2655-2655/mobapps.mypersonal.biz.grouptracker E/dalvikvm: Could not find class 'com.google.firebase.FirebaseApiNotAvailableException',referenced from method com.google.firebase.FirebaseApp.getToken 06-03 01:36:29.629 2655-2655/mobapps.mypersonal.biz.grouptracker E/dalvikvm: Could not find class 'com.google.firebase.FirebaseApp$zza',referenced from method com.google.firebase.FirebaseApp.zza 06-03 01:36:29.639 2655-2655/mobapps.mypersonal.biz.grouptracker E/AndroidRuntime: FATAL EXCEPTION: main Process: mobapps.mypersonal.biz.grouptracker,PID: 2655 java.lang.NoClassDefFoundError: com.google.firebase.FirebaSEOptions at com.google.firebase.FirebaseApp.zzbu(UnkNown Source) at com.google.firebase.provider.FirebaseInitProvider.onCreate(UnkNown Source) at android.content.ContentProvider.attachInfo(ContentProvider.java:1656) at android.content.ContentProvider.attachInfo(ContentProvider.java:1627) at com.google.firebase.provider.FirebaseInitProvider.attachInfo(UnkNown Source) at android.app.ActivityThread.installProvider(ActivityThread.java:5079) at android.app.ActivityThread.installContentProviders(ActivityThread.java:4653) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4593) at android.app.ActivityThread.access$1500(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1402) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:5363) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644) at dalvik.system.NativeStart.main(Native Method)
解决方法
>将编译’com.android.support:multidex:1.0.1’添加到
应用程序/的build.gradle.
>将android:name =“android.support.multidex.MultiDexApplication”添加到AndroidManifest.xml中的应用程序标签.
如果您使用自定义应用程序类,请跳过AndroidManifest.xml,并使您的Application类扩展MultiDexApplication而不是应用程序.
我们今天的关于java-Firebase,classmaper:在类“ myclass”上找不到“ UserTwo”的设置器/字段和java报错找不到类的分享就到这里,谢谢您的阅读,如果想了解更多关于'java.lang.NoClassDefFoundError 由 java.lang.ClassNotFoundException 引起的 Ljava/util/Base64 解析失败 未找到类“java.util.Base64”、android – com.google.firebase.provider.FirebaseInitProvider:java.lang.ClassNotFoundException:com.g、android – dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)中的类加载错误?、android – NoClassDefFoundError:com.google.firebase.FirebaseOptions的相关信息,可以在本站进行搜索。
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