在下面的代码中,我得到了一个关于Gson()、jsonString和TypeToken的错误:
Map<String, Object> jsonMap = new Gson().fromJson(jsonString, new TypeToken<HashMap<String, Object>>() {}.getType());实际方法为: public void sendButton(View v) { Message myMessage =新消息(用户名,getTimeAndDate(),getMessage(),chatroomName,隐名);
String message = myMessage.messageData();
Map<String, Object> jsonMap = new Gson().fromJson(jsonString, new TypeToken<HashMap<String, Object>>() {}.getType());
// ref.setValue(myMessage.messageData());在我的Message类中,messageData()和jsonString在以下代码中定义:
public String messageData() {
JSONObject obj1 = new JSONObject();
JSONObject obj2 = new JSONObject();
// Map<String, JSONObject> mapJSON = new HashMap<String, JSONObject>();
try {
obj1.put("Message", chatMessage);
obj1.put("Username", username);
obj1.put("isIncognito", Incognito);
obj2.put(Long.toString(sendTime), obj1.toString());
} catch (JSONException JE) {
Log.e("Json Crash!!!", "Something went wrong here");
}
String jsonString = obj2.toString();
//
// mapJSON.put(chatRoomName, obj2);
return jsonString;
}我的应用程序的构建gradle:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.google.gms:google-services:3.1.0'
classpath 'com.google.code.gson:gson:2.2.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}我的应用程序的依赖项在以下代码中:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile 'com.android.support:design:25.3.1'
compile 'com.google.firebase:firebase-storage:10.2.0'
compile 'com.google.firebase:firebase-auth:10.2.0'
compile 'com.google.firebase:firebase-core:10.2.0'
compile 'com.google.firebase:firebase-database:10.2.0'
compile 'com.google.android.gms:play-services-ads:10.2.0'
compile files('libs/gson-2.2.4.jar')
testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-service我最终尝试使用Gson来使我的json工作,因为我的json代码现在不能工作,所以如果你们对此有建议,请帮助,但我也在寻找关于导入Gson/导入库的帮助。谢谢!
抱歉,如果我搞砸了格式,或者如果这是一个重复的线程,我对堆栈溢出和发布有点陌生!抱歉的!
发布于 2017-11-30 13:57:08
在使用Gson的activity中添加以下行:
import com.google.gson.Gson;同时删除以下你不需要的文件:
classpath 'com.google.code.gson:gson:2.2.3'在您的依赖中,使用以下命令而不是编译文件命令:
compile 'com.google.code.gson:gson:2.6.2'发布于 2017-11-30 14:11:23
您将Gson依赖项放在了错误的位置。从项目生成gradle中删除Gson依赖项
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'com.google.gms:google-services:3.1.0'
classpath 'com.google.code.gson:gson:2.2.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files}
并将其放入应用程序模块依赖中,如下所示
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.0'
compile 'com.android.support:design:25.3.0'
compile 'com.android.support:support-v13:25.3.0'
compile 'com.android.support:support-v4:25.3.0'
compile 'com.android.support:recyclerview-v7:25.3.0'
compile 'com.google.code.gson:gson:2.8.1'
testCompile 'junit:junit:4.12'}
发布于 2017-11-30 14:16:09
dependencies {
compile 'com.google.code.gson:gson:2.2.+'
compile 'com.android.support:support-v4:13.0.+'
compile 'com.android.support:appcompat-v7:18.0.+'
}添加这个
https://stackoverflow.com/questions/47566665
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