自定义Gson序列化反序列化题目实体类逻辑

SnackBar增加操作属性和回调配置
增加社团题库管理

app/build.gradle.kts

@@ -26,7 +26,7 @@ android {
         val serverAddress=rootProject.extra["SERVER_ADDRESS"]
         debug {
             manifestPlaceholders.apply {
-                this["APP_NAME"] = appName;
+                this["APP_NAME"] = appName
             }
             buildConfigField(type="String",name="APP_NAME",value = "\"$appName\"")
             buildConfigField(type="String",name="SERVER_ADDRESS",value = "\"$serverAddress\"")
@@ -38,7 +38,7 @@ android {
                 "proguard-rules.pro"
             )
             manifestPlaceholders.apply {
-                this["APP_NAME"] = appName;
+                this["APP_NAME"] = appName
             }
             buildConfigField(type="String",name="APP_NAME",value = "\"$appName\"")
             buildConfigField(type="String",name="SERVER_ADDRESS",value = "\"$serverAddress\"")
@@ -122,6 +122,8 @@ dependencies {
      * https://kotlinlang.org/docs/serialization.html
      */
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0")
+
+    implementation("org.jetbrains.kotlin:kotlin-reflect:${rootProject.extra["kotlin_version"]}")
     /**
      * https://developer.android.com/jetpack/androidx/releases/navigation
      */

app/src/androidTest/java/com/gyf/csams/ExampleInstrumentedTest.kt

@@ -18,5 +18,7 @@ class ExampleInstrumentedTest {
         // Context of the app under test.
         val appContext = InstrumentationRegistry.getInstrumentation().targetContext
         assertEquals("com.gyf.csams", appContext.packageName)
+
+
     }
 }

app/src/main/AndroidManifest.xml

@@ -57,6 +57,11 @@
         <activity android:name=".association.ui.ReNameActivity"
             android:exported="true">
         </activity>
+
+        <!--题库界面-->
+        <activity android:name=".association.ui.ExamActivity"
+            android:exported="true">
+        </activity>
     </application>
 
 </manifest>

app/src/main/java/com/gyf/csams/association/model/ExamViewModel.kt

@@ -0,0 +1,227 @@
+package com.gyf.csams.association.model
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import com.gyf.csams.uikit.ScrollList
+import com.gyf.csams.uikit.StringForm
+import kotlin.random.Random
+
+/**
+ * 题型
+ *
+ */
+enum class ExamType(val type:String){
+    //选择题
+    cq("选择题"),
+    //开放题
+    oq("开放题")
+}
+
+sealed class Exam{
+    abstract val examType:ExamType
+    abstract val question:StringForm
+}
+
+
+/**
+ * 开放题
+ *
+ * @property examType 题型描述
+ * @property question 问题
+ */
+data class OpenQuestionsVo(
+    override val examType: ExamType = ExamType.oq, override val question: StringForm
+
+) : Exam()
+
+/**
+ * 选择题
+ *
+ * @property examType 题型描述
+ * @property answers 答案
+ * @property rightAnswer 正确答案
+ * @property question 问题
+ */
+data class ChoiceQuestionVo(override val examType: ExamType = ExamType.cq,
+                            val answers:List<StringForm>,
+                            val rightAnswer:Int,
+                            override val question: StringForm
+):Exam()
+
+
+
+
+/**
+ * 题库状态管理
+ *
+ */
+
+/**
+ * 问题长度
+ */
+const val QUESTION_TEXT_LENGTH=30
+
+/**
+ * 选择题选项数
+ */
+const val ANSWER_SIZE=4
+
+/**
+ * 答案长度
+ *
+ */
+const val ANSWER_TEXT_LENGTH=15
+
+
+class ExamViewModel:ScrollList<Exam>() {
+    val questionIsNull: String = "问题不能为空"
+    val deleteLeastOne: String="至少保留一道题目"
+    val updateExam="更新题库"
+    val back="返回"
+    val menuName="入团题库"
+    val deleteTip="确定删除此题目？"
+    val addTip="确定添加此题目？"
+    val actionLabel="确定"
+
+
+    override val initSize = 10
+
+
+    private val _newExam:MutableLiveData<Exam> = MutableLiveData(createExam(ExamType.cq))
+    val newExam:LiveData<Exam> = _newExam
+
+    init {
+        load()
+    }
+
+    /**
+     * 切换题型
+     *
+     */
+    fun switchType(exam: Exam){
+        if(exam is ChoiceQuestionVo) _newExam.value=createExam(ExamType.oq) else _newExam.value=createExam(ExamType.cq)
+    }
+
+
+    /**
+     * 创建题目
+     *
+     * @param type
+     * @return
+     */
+    private fun createExam(type: ExamType): Exam {
+        val question=StringForm(formDesc = "问题",textLength = QUESTION_TEXT_LENGTH)
+        return when(type){
+            ExamType.cq-> ChoiceQuestionVo(
+                answers = ('A'..'D').map { StringForm(formDesc = "选项",textLength = ANSWER_TEXT_LENGTH,value = "选项$it") },
+                rightAnswer = 0,
+                question = question
+            )
+            ExamType.oq-> OpenQuestionsVo(question = question)
+        }
+    }
+
+
+    /**
+     * 更新题目
+     *
+     */
+    fun update(oldExam: Exam,newExam:Exam){
+        if(oldExam==_newExam.value){
+            _newExam.value=newExam
+        }else{
+            _data.value?.apply {
+                this[indexOf(oldExam)]=newExam
+                val list = mutableListOf<Exam>()
+                list.addAll(this)
+                _data.value?.clear()
+                _data.value=list
+            }
+        }
+    }
+
+    /**
+     * TODO 更新题库
+     *
+     * @param callback
+     */
+    fun updateExam(callback: (message: String) -> Unit){
+        callback("功能尚未实现，敬请期待")
+
+    }
+
+    /**
+     * 加载题目
+     *
+     */
+    override fun load() {
+        _data.value?.apply {
+            repeat(initSize) {
+                if (Random.nextBoolean()){
+                    add(OpenQuestionsVo(question = StringForm(formDesc = "问题",textLength = QUESTION_TEXT_LENGTH,value = "这是一道开放题：$size")))
+                } else{
+                    add(
+                        ChoiceQuestionVo(
+                            question = StringForm(formDesc = "问题",textLength = QUESTION_TEXT_LENGTH,value = "这是一道选择题：$size"),
+                            answers = ('A'..'D').map { StringForm(formDesc = "选项",textLength = ANSWER_TEXT_LENGTH,value = "选项$it") },
+                            rightAnswer = Random.nextInt(ANSWER_SIZE)
+                        )
+                    )
+                }
+
+            }
+        }
+    }
+
+    /**
+     *TODO 加载更多题目
+     *
+     * @param callback
+     */
+    override fun loadMore(callback: (message: String) -> Unit) {
+//        _data.value?.apply {
+//            val list= mutableListOf<Exam>()
+//            list.addAll(this)
+//            list.apply {
+//                repeat(10) {
+//                    if (Random.nextBoolean()) add(OpenQuestionsVo(question = "这是一道开放题：$size")) else add(
+//                        ChoiceQuestionVo(
+//                            question = "这是一道选择题：$size，请从选项中选出正确答案",
+//                            answers = listOf("选项A", "选项B", "选项C", "选项D"),
+//                            rightAnswer = 3
+//                        )
+//                    )
+//                }
+//            }
+//            _data.postValue(list)
+//            callback("成功加载更多题目")
+//        }
+
+//        callback("功能尚未实现，敬请期待")
+    }
+
+    fun addQuestion() {
+        _data.value?.apply {
+            _newExam.value?.let{
+                val list= mutableListOf<Exam>()
+                list.addAll(this)
+                list.add(it)
+                _data.postValue(list)
+            }
+            _newExam.value=createExam(ExamType.cq)
+        }
+    }
+
+    /**
+     * TODO 删除题目
+     *
+     */
+    fun deleteQuestion(exam: Exam) {
+        _data.value?.apply {
+            val list = mutableListOf<Exam>()
+            remove(exam)
+            list.addAll(this)
+            _data.postValue(list)
+        }
+    }
+}

app/src/main/java/com/gyf/csams/association/ui/AssociationActivity.kt

@@ -108,7 +108,7 @@ private fun Search(modifier:Modifier=Modifier, model: MemberViewModel= viewModel
             Spacer(modifier = Modifier.weight((spaceWeight)))
             BaseTextField(modifier = Modifier.weight(textFieldWeight),form = model.name,singeLine = true)
             Spacer(modifier = Modifier.weight(spaceWeight))
-            OutlinedButton(onClick = { model.search { scaffoldModel.update(it) } },modifier = Modifier.weight(buttonWeight)) {
+            OutlinedButton(onClick = { model.search { scaffoldModel.update(message=it) } },modifier = Modifier.weight(buttonWeight)) {
                 Text(text = model.search)
             }
             Spacer(modifier = Modifier.weight(spaceWeight))
@@ -148,7 +148,7 @@ private fun MemberList(modifier: Modifier=Modifier, model: MemberViewModel=viewM
             item {
                 Row(horizontalArrangement = Arrangement.Center,modifier = Modifier.fillMaxWidth()) {
                     IconButton(onClick = { model.loadMore{
-                        scaffoldModel.update(it)
+                        scaffoldModel.update(message=it)
                     } }) {
                         Icon(painter = painterResource(id = R.drawable.ic_arrow_down), contentDescription = null)
                     }
@@ -302,7 +302,7 @@ private fun HistoryActivityList(modifier: Modifier,model:HistoryActViewModel= vi
         }
     }
     if(listState.layoutInfo.totalItemsCount-listState.firstVisibleItemIndex==model.initSize/2-1){
-        model.loadMore { scaffoldModel.update(it) }
+        model.loadMore { scaffoldModel.update(message=it) }
     }
 }
 

app/src/main/java/com/gyf/csams/association/ui/ExamActivity.kt

@@ -0,0 +1,306 @@
+package com.gyf.csams.association.ui
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.gyf.csams.R
+import com.gyf.csams.association.model.*
+import com.gyf.csams.uikit.*
+
+/**
+ * 题库管理
+ *
+ */
+class ExamActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            Body { scaffoldState ->
+                MainFrame(background = { Background(image = BackgroundImage.exam) }) {
+                    Spacer(modifier = Modifier.weight(0.1F))
+                    Title(modifier = Modifier.weight(0.1F))
+                    Exam(modifier = Modifier.weight(0.8F))
+                    ShowSnackbar(scaffoldState = scaffoldState)
+                }
+            }
+        }
+    }
+}
+
+/**
+ * 底部按钮
+ *
+ */
+@Composable
+private fun BottomButton(
+    modifier: Modifier = Modifier,
+    model: ExamViewModel = viewModel(),
+    scaffoldModel: ScaffoldModel = viewModel()
+) {
+    val context = LocalContext.current as ExamActivity
+    Row(modifier = modifier, horizontalArrangement = Arrangement.Center) {
+        OutlinedButton(onClick = {
+            model.updateExam { scaffoldModel.update(message=it) }
+        }, modifier = Modifier.background(color = MaterialTheme.colors.primary)) {
+            Text(text = model.updateExam)
+        }
+        Spacer(modifier = Modifier.width(10.dp))
+        OutlinedButton(onClick = {
+            context.onBackPressed()
+        }, modifier = Modifier.background(color = MaterialTheme.colors.secondary)) {
+            Text(text = model.back)
+        }
+    }
+}
+
+/**
+ * 标题
+ *
+ * @param modifier
+ * @param model
+ */
+@Composable
+private fun Title(modifier: Modifier = Modifier, model: ExamViewModel = viewModel()) {
+    Row(horizontalArrangement = Arrangement.Center, modifier = modifier.fillMaxWidth()) {
+        Text(text = model.menuName, style = MaterialTheme.typography.h4)
+    }
+}
+
+@Composable
+private fun ExamChild(it:Exam,examHeight: Dp,isAdd: Boolean=false){
+    val questionWeight=0.3F
+    when (it) {
+        is OpenQuestionsVo -> ExamOQ(
+            openQuestionsVo = it,
+            modifier = Modifier.height(examHeight*questionWeight),
+            isAdd = isAdd
+        )
+        is ChoiceQuestionVo -> ExamCQ(
+            choiceQuestionVo = it,
+            modifier = Modifier.height(examHeight),
+            questionWeight = questionWeight,
+            isAdd = isAdd
+        )
+    }
+}
+
+/**
+ * 题目列表
+ *
+ * @param modifier
+ * @param model
+ */
+@Composable
+private fun Exam(
+    modifier: Modifier = Modifier,
+    model: ExamViewModel = viewModel(),
+    scaffoldModel: ScaffoldModel = viewModel(),
+    examHeight: Dp = 350.dp
+) {
+    val listState = rememberLazyListState()
+    val data by model.data.observeAsState()
+    val newExam by model.newExam.observeAsState()
+    LazyColumn(state = listState, modifier = modifier) {
+        data?.forEach {
+            item {
+                ExamChild(it = it, examHeight = examHeight)
+                Spacer(modifier = Modifier.height(20.dp))
+            }
+        }
+        newExam?.let {
+            item {
+                Column {
+                    OutlinedButton(onClick = { model.switchType(it) }) {
+                        Text(text = "切换到${if (newExam is ChoiceQuestionVo) "开放题" else "选择题"}")
+                    }
+                    ExamChild(it = it, examHeight = examHeight,isAdd = true)
+                }
+            }
+        }
+
+        item {
+            Column {
+                Divider(color = MaterialTheme.colors.background)
+                Spacer(modifier = Modifier.height(30.dp))
+                BottomButton(modifier = Modifier.fillMaxWidth())
+            }
+        }
+
+
+    }
+    if (listState.layoutInfo.totalItemsCount - listState.firstVisibleItemIndex == model.initSize / 2 - 1) {
+        model.loadMore { scaffoldModel.update(message=it) }
+    }
+
+
+}
+
+/**
+ * 问题
+ *
+ * @param modifier
+ * @param exam
+ */
+@Composable
+private fun Question(modifier: Modifier = Modifier, exam: Exam) {
+    BaseTextField(
+        form = exam.question,
+        modifier = modifier
+            .fillMaxSize()
+            .background(color = MaterialTheme.colors.background)
+    )
+
+}
+
+/**
+ * 操作按钮
+ *
+ */
+@Composable
+private fun ActionButton(modifier: Modifier = Modifier, isAdd: Boolean,
+                         model: ExamViewModel= viewModel(),
+                         scaffoldModel: ScaffoldModel= viewModel(),
+                         exam: Exam) {
+    val list by model.data.observeAsState()
+    val newExam by model.newExam.observeAsState()
+    Box(
+        contentAlignment = Alignment.Center,
+        modifier = modifier
+    ) {
+        IconButton(onClick = {
+            if(isAdd){
+                if((newExam?.question?.formValue?.value ?: "").isNotEmpty()){
+                    scaffoldModel.update(message=model.addTip,actionLabel = model.actionLabel){
+                        model.addQuestion()
+                    }
+                }else{
+                    scaffoldModel.update(message = model.questionIsNull)
+                }
+
+            }else{
+                if(list?.size==1){
+                    scaffoldModel.update(model.deleteLeastOne)
+                }else{
+                    scaffoldModel.update(message=model.deleteTip,actionLabel = model.actionLabel){
+                        model.deleteQuestion(exam = exam)
+                    }
+                }
+            }
+        }) {
+            Icon(
+                painter = painterResource(id = if (isAdd) R.drawable.ic_add_select else R.drawable.ic_sami_select),
+                contentDescription = null
+            )
+        }
+    }
+}
+
+
+/**
+ * 开放题
+ *
+ * @param openQuestionsVo
+ */
+@Composable
+private fun ExamOQ(
+    modifier: Modifier = Modifier,
+    openQuestionsVo: OpenQuestionsVo,
+    isAdd: Boolean = false
+) {
+    Row(modifier = modifier) {
+        Question(
+            exam = openQuestionsVo, modifier = Modifier
+                .weight(0.8F)
+                .fillMaxHeight()
+        )
+        ActionButton(
+            modifier = Modifier
+                .weight(0.2F)
+                .fillMaxHeight(),
+            isAdd = isAdd,
+            exam = openQuestionsVo
+        )
+    }
+}
+
+/**
+ * 选择题
+ *
+ * @param choiceQuestionVo
+ */
+@Composable
+private fun ExamCQ(
+    modifier: Modifier = Modifier,
+    choiceQuestionVo: ChoiceQuestionVo,
+    isAdd: Boolean = false,
+    model: ExamViewModel = viewModel(),
+    questionWeight:Float
+) {
+    Row(modifier = modifier) {
+        Column(
+            modifier = Modifier
+                .weight(0.8F)
+                .fillMaxHeight()
+        ) {
+            Question(
+                exam = choiceQuestionVo,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .weight(questionWeight)
+            )
+            Card(
+                backgroundColor = MaterialTheme.colors.secondaryVariant,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .weight(1 - questionWeight)
+            ) {
+
+                choiceQuestionVo.answers.apply {
+                    Column {
+                        forEach {
+                            Row(modifier = Modifier
+                                .fillMaxWidth()
+                                .weight(1F / ANSWER_SIZE)) {
+                                val answerIndex: Int = indexOf(it)
+                                val click = {
+                                    model.update(
+                                        oldExam = choiceQuestionVo,
+                                        newExam = choiceQuestionVo.copy(rightAnswer = answerIndex)
+                                    )
+                                }
+                                val isRightAnswer =
+                                    choiceQuestionVo.rightAnswer == answerIndex
+                                RadioButton(selected = isRightAnswer, onClick = click)
+                                BaseTextField(form = it)
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        ActionButton(
+            modifier = Modifier
+                .weight(0.2F)
+                .fillMaxHeight(),
+            isAdd = isAdd,
+            exam = choiceQuestionVo
+        )
+
+    }
+}

app/src/main/java/com/gyf/csams/association/ui/ReNameActivity.kt

@@ -101,7 +101,7 @@ private fun BottomButton(modifier: Modifier=Modifier,model:RenameViewModel= view
         val context= LocalContext.current as ReNameActivity
         Spacer(modifier = Modifier.weight(weight))
         Row(modifier=Modifier.weight(0.5F)) {
-            OutlinedButton(onClick = { model.post{scaffoldModel.update(it)} }) {
+            OutlinedButton(onClick = { model.post{scaffoldModel.update(message=it)} }) {
                 Text(text = model.postDesc)
             }
             Spacer(modifier = Modifier.width(10.dp))

app/src/main/java/com/gyf/csams/association/ui/RegAssociationActivity.kt

@@ -179,7 +179,7 @@ private fun BottomButton(modifier: Modifier=Modifier,scaffoldModel: ScaffoldMode
     val context= LocalContext.current as RegAssociationActivity
     Row(modifier = modifier,horizontalArrangement = Arrangement.Center) {
         OutlinedButton(onClick = {
-            model.register { scaffoldModel.update(it) }
+            model.register { scaffoldModel.update(message=it) }
         },modifier = Modifier.background(color = MaterialTheme.colors.primary)) {
             Text(text = model.register)
         }

app/src/main/java/com/gyf/csams/main/ui/MainActivity.kt

@@ -206,7 +206,7 @@ private fun AssociationListBody(model: ListViewModel = viewModel(),scaffoldModel
     }
 
     if(listState.layoutInfo.totalItemsCount-listState.firstVisibleItemIndex==model.associationListSize/2-1){
-        model.loadMore { scaffoldModel.update(it) }
+        model.loadMore { scaffoldModel.update(message=it) }
     }
 }
 
@@ -243,7 +243,7 @@ private fun AssociationSearch(model: ListViewModel = viewModel(),scaffoldModel:
                 modifier = Modifier.height(10.dp)
             )
             Row(horizontalArrangement = Arrangement.Center, modifier = Modifier.fillMaxWidth()) {
-                OutlinedButton(onClick = { model.search { scaffoldModel.update(it) } }, modifier = Modifier.width(100.dp)) {
+                OutlinedButton(onClick = { model.search { scaffoldModel.update(message=it) } }, modifier = Modifier.width(100.dp)) {
                     Text(text = model.searchDesc)
                 }
             }
@@ -269,7 +269,7 @@ private fun Notification(mainViewModel: MainViewModel= viewModel(),scaffoldModel
             .padding(10.dp)
     ) {
         IconButton(onClick = {
-            mainViewModel.openNotification { scaffoldModel.update(it) }
+            mainViewModel.openNotification { scaffoldModel.update(message=it) }
         }) {
             Icon(
                 painter = painterResource(id = R.drawable.ic_notification),
@@ -312,7 +312,7 @@ private fun MessageBoard(model: MarqueeViewModel = viewModel(),mainViewModel:Mai
         ) {
 
 
-            IconButton(onClick = { mainViewModel.sendMessage { scaffoldModel.update(it) } }) {
+            IconButton(onClick = { mainViewModel.sendMessage { scaffoldModel.update(message=it) } }) {
                 Icon(
                     painter = painterResource(id = R.drawable.ic_comments),
                     contentDescription = null,

app/src/main/java/com/gyf/csams/uikit/BaseView.kt

@@ -67,12 +67,16 @@ fun AnimationText(text:String){
  * 主菜单
  *
  */
-enum class MainMenu(@DrawableRes val selectedIcon:Int,
+enum class MainMenu(
-                    @DrawableRes val unSelectedIcon:Int){
+    @DrawableRes val selectedIcon: Int,
+    @DrawableRes val unSelectedIcon: Int
+) {
     //主页
     Main(R.drawable.ic_home_fill, R.drawable.ic_home),
+
     //社团列表
     List(R.drawable.ic_all_fill, R.drawable.ic_all),
+
     //个人中心
     Center(R.drawable.ic_account_fill, R.drawable.ic_account)
 }
@@ -87,8 +91,9 @@ enum class MainMenu(@DrawableRes val selectedIcon:Int,
  */
 @Composable
 fun MenuIconButton(_menu: MainMenu, menu: MainMenu, modifier: Modifier, onClick: () -> Unit) {
-    Row(modifier = modifier
+    Row(
-        ,horizontalArrangement = Arrangement.Center) {
+        modifier = modifier, horizontalArrangement = Arrangement.Center
+    ) {
         IconButton(onClick = onClick) {
             Icon(
                 painter = painterResource(id = if (_menu == menu) menu.selectedIcon else menu.unSelectedIcon),
@@ -139,13 +144,22 @@ enum class AssociationMenu(val menuName:String){
  *
  */
 @Composable
-fun AssociationAppBar(menu: AssociationMenu,nav: NavHostController,back:()->Unit,dropMenu:()->Unit){
+fun AssociationAppBar(
+    menu: AssociationMenu,
+    nav: NavHostController,
+    back: () -> Unit,
+    dropMenu: () -> Unit
+) {
     TopAppBar(backgroundColor = MaterialTheme.colors.secondary) {
         Row(modifier = Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
             IconButton(onClick = back, modifier = Modifier.weight(0.1F)) {
-               Icon(painter = painterResource(id = R.drawable.ic_arrow_left), contentDescription = null)
+                Icon(
+                    painter = painterResource(id = R.drawable.ic_arrow_left),
+                    contentDescription = null
+                )
             }
-           Row(modifier = Modifier
+            Row(
+                modifier = Modifier
                     .weight(0.8F)
                     .fillMaxHeight(),
                 horizontalArrangement = Arrangement.Center,
@@ -153,20 +167,29 @@ fun AssociationAppBar(menu: AssociationMenu,nav: NavHostController,back:()->Unit
             ) {
                 val menus = AssociationMenu.values()
                 menus.forEach {
-                   Row(modifier = Modifier
+                    Row(
+                        modifier = Modifier
                             .weight(1F / menus.size)
                             .clickable(onClick = { nav.navigate(it.name) }),
-                       horizontalArrangement = Arrangement.Center) {
+                        horizontalArrangement = Arrangement.Center
-                        Text(text = it.menuName,color = if(menu==it) MaterialTheme.colors.primary else MaterialTheme.colors.onBackground)
+                    ) {
+                        Text(
+                            text = it.menuName,
+                            color = if (menu == it) MaterialTheme.colors.primary else MaterialTheme.colors.onBackground
+                        )
                     }
                 }
             }
             IconButton(onClick = dropMenu, modifier = Modifier.weight(0.1F)) {
-               Icon(painter = painterResource(id = R.drawable.ic_configuration), contentDescription = null)
+                Icon(
+                    painter = painterResource(id = R.drawable.ic_configuration),
+                    contentDescription = null
+                )
             }
         }
     }
 }
+
 /**
  * 跑马灯
  *
@@ -174,9 +197,12 @@ fun AssociationAppBar(menu: AssociationMenu,nav: NavHostController,back:()->Unit
  * @param content
  */
 @Composable
-fun Marquee(model: MarqueeViewModel = viewModel(), content: @Composable BoxScope.(model: MarqueeViewModel,
+fun Marquee(
+    model: MarqueeViewModel = viewModel(), content: @Composable BoxScope.(
+        model: MarqueeViewModel,
         value: State<Float>
-) -> Unit) {
+    ) -> Unit
+) {
 
     val delayMillis = 2000
     Column {
@@ -232,7 +258,12 @@ fun MarqueeText(model: MarqueeViewModel = viewModel(), offset: State<Float>) {
  * @param body 内容
  */
 @Composable
-fun MainFrame( background:@Composable ()->Unit,mainMenu: MainMenu,nav: NavHostController,body:@Composable ColumnScope.()->Unit){
+fun MainFrame(
+    background: @Composable () -> Unit,
+    mainMenu: MainMenu,
+    nav: NavHostController,
+    body: @Composable ColumnScope.() -> Unit
+) {
     Box(modifier = Modifier.fillMaxSize()) {
         background()
         Column {
@@ -284,7 +315,11 @@ fun Carousel(
  * @param singeLine
  */
 @Composable
-fun <T:StringForm> BaseTextField(modifier:Modifier=Modifier,form:T, singeLine:Boolean=false){
+fun <T : StringForm> BaseTextField(
+    modifier: Modifier = Modifier,
+    form: T,
+    singeLine: Boolean = false
+) {
     val name: String by form.formValue.observeAsState("")
     val focusManager = LocalFocusManager.current
     OutlinedTextField(
@@ -307,17 +342,34 @@ fun <T:StringForm> BaseTextField(modifier:Modifier=Modifier,form:T, singeLine:Bo
  */
 @Composable
 fun ShowSnackbar(model: ScaffoldModel = viewModel(), scaffoldState: ScaffoldState) {
-    val message:String? by model.message.observeAsState()
+    val snackBar: SnackBar? by model.data.observeAsState()
-    message?.let {
+    snackBar?.apply {
-        Logger.i("message=$it")
+        if (message != null) {
             LaunchedEffect(scaffoldState) {
                 launch {
-                scaffoldState.snackbarHostState.showSnackbar(
+                    if (actionLabel != null) {
-                    message = it
+                        val result=scaffoldState.snackbarHostState.showSnackbar(
+                            message = message, actionLabel = actionLabel,
+                            duration = duration
+
                         )
+                        when(result){
+                            SnackbarResult.ActionPerformed->{
+                                Logger.i("点击操作按钮")
+                                callback()
+                            }
+                            SnackbarResult.Dismissed->{
+                                Logger.d("窗口消失")
+                            }
+                        }
+                    } else {
+                        scaffoldState.snackbarHostState.showSnackbar(message = message)
+                    }
                     model.update()
                 }
             }
+
+        }
     }
 }
 
@@ -330,16 +382,25 @@ fun ShowSnackbar(model:ScaffoldModel= viewModel(),scaffoldState: ScaffoldState){
 enum class BackgroundImage(@DrawableRes val id: Int) {
     //主页
     main(R.drawable.mb_bg_fb_08),
+
     //社团列表
     list(R.drawable.mb_bg_fb_07),
+
     //个人中心
     center(R.drawable.mb_bg_fb_28),
+
     //注册社团
     reg_association(R.drawable.mb_bg_fb_06),
+
     //社团主界面
     association_main(R.drawable.mb_bg_fb_25_180),
+
     //社团重命名
-    rename(R.drawable.mb_bg_fb_27)
+    rename(R.drawable.mb_bg_fb_27),
+
+    //社团题库管理
+    exam(R.drawable.mb_bg_fb_02)
+
 }
 
 /**
@@ -354,7 +415,11 @@ fun Background(image: BackgroundImage, alpha:Float= DefaultAlpha){
 
     BoxWithConstraints {
         Image(
-            bitmap = app.getImage(image = image,reqHeight = maxHeight.value.toInt()/2,reqWidth = maxWidth.value.toInt()/2),
+            bitmap = app.getImage(
+                image = image,
+                reqHeight = maxHeight.value.toInt() / 2,
+                reqWidth = maxWidth.value.toInt() / 2
+            ),
             contentDescription = null,
             contentScale = ContentScale.FillHeight,
             alpha = alpha,

app/src/main/java/com/gyf/csams/uikit/ViewModel.kt

@@ -1,5 +1,6 @@
 package com.gyf.csams.uikit
 
+import androidx.compose.material.SnackbarDuration
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
@@ -29,6 +30,11 @@ abstract class FormName<T>(val formDesc:String){
  */
 open class StringForm(formDesc: String, val textLength: Int) : FormName<String>(formDesc = formDesc),
     FormLength {
+
+    constructor(formDesc: String,textLength: Int,value:String) : this(formDesc = formDesc,textLength = textLength) {
+        _formValue.value=value
+    }
+
     override val nameLengthError="${formDesc}不能超过最大长度$textLength"
 
     override fun onChange(value: String) {
@@ -41,16 +47,23 @@ open class StringForm(formDesc: String, val textLength: Int) : FormName<String>(
     }
 }
 
+
+data class SnackBar(val message:String?, val actionLabel:String?=null,val duration: SnackbarDuration=SnackbarDuration.Short, val callback: () -> Unit?)
+
 /**
  * snackbar
  *
  */
 class ScaffoldModel:ViewModel(){
-    private val _message=MutableLiveData<String>()
+    private val _data=MutableLiveData<SnackBar>()
-    val message:LiveData<String> = _message
+    val data:LiveData<SnackBar> = _data
 
-    fun update(message:String?=null){
+    fun update(message:String?=null,actionLabel: String? = null,callback: () -> Unit? =  {}){
-        _message.value=message
+        if(message==null){
+            _data.value=null
+        }else {
+            _data.value = SnackBar(message = message, actionLabel = actionLabel,callback = callback)
+        }
     }
 }
 

app/src/main/java/com/gyf/csams/util/GsonUtil.kt

@@ -0,0 +1,111 @@
+package com.gyf.csams.util
+
+import com.google.gson.*
+import com.google.gson.reflect.TypeToken
+import com.gyf.csams.association.model.*
+import com.gyf.csams.uikit.StringForm
+import java.lang.reflect.Type
+
+class OpenQuestionsVoSerializer: JsonSerializer<OpenQuestionsVo> {
+    override fun serialize(
+        vo: OpenQuestionsVo?,
+        p1: Type?,
+        p2: JsonSerializationContext?
+    ): JsonElement {
+        val gson= Gson()
+        val c = JsonObject()
+        c.add("examType", gson.toJsonTree(vo?.examType?.name))
+        c.add("question",gson.toJsonTree(vo?.question?.formValue?.value))
+        return  c
+    }
+}
+
+class OpenQuestionsVoDeserializer: JsonDeserializer<OpenQuestionsVo> {
+    override fun deserialize(
+        json: JsonElement?,
+        p1: Type?,
+        p2: JsonDeserializationContext?
+    ): OpenQuestionsVo {
+        val root=json?.asJsonObject
+        val value=root?.get("question")?.asString
+        val question= StringForm(formDesc = "问题",textLength = QUESTION_TEXT_LENGTH)
+        if (value != null) {
+            question.onChange(value)
+            return OpenQuestionsVo(question = question)
+        }else{
+            throw NullPointerException("问题无法解析！！！！")
+        }
+    }
+}
+
+class ChoiceQuestionVoSerializer: JsonSerializer<ChoiceQuestionVo> {
+    override fun serialize(
+        vo: ChoiceQuestionVo?,
+        p1: Type?,
+        p2: JsonSerializationContext?
+    ): JsonElement {
+        val gson= Gson()
+        val c = JsonObject()
+        c.add("examType", gson.toJsonTree(vo?.examType?.name))
+        c.add("question",gson.toJsonTree(vo?.question?.formValue?.value))
+        c.add("answers",gson.toJsonTree(vo?.answers))
+        c.add("rightAnswer",gson.toJsonTree(vo?.rightAnswer))
+        return c
+    }
+}
+
+class ChoiceQuestionVoDeserializer: JsonDeserializer<ChoiceQuestionVo> {
+    override fun deserialize(
+        json: JsonElement?,
+        p1: Type?,
+        p2: JsonDeserializationContext?
+    ): ChoiceQuestionVo {
+        val root=json?.asJsonObject
+        val value=root?.get("question")?.asString
+        val question=StringForm(formDesc = "问题",textLength = QUESTION_TEXT_LENGTH)
+        if (value != null) {
+            question.onChange(value)
+            val gson=Gson()
+            val answers:List<String> = gson.fromJson(root.get("answers"),object : TypeToken<List<String>>() {}.type)
+            if(answers.size!= ANSWER_SIZE){
+                throw IllegalArgumentException("选项数量!=$QUESTION_TEXT_LENGTH")
+            }
+            val rightAnswer=root.get("rightAnswer").asInt
+            return ChoiceQuestionVo(
+                question = question,
+                answers = answers.map { StringForm(formDesc = "选项",textLength = ANSWER_TEXT_LENGTH,value=it) },
+                rightAnswer = rightAnswer
+            )
+        }else{
+            throw NullPointerException("问题无法解析！！！！")
+        }
+    }
+}
+
+/**
+ * 题目反序列化
+ *
+ */
+class ExamDeserializer:JsonDeserializer<Exam>{
+    companion object{
+        val gson: Gson =GsonBuilder()
+            .registerTypeAdapter(OpenQuestionsVo::class.java,OpenQuestionsVoDeserializer())
+            .registerTypeAdapter(ChoiceQuestionVo::class.java,ChoiceQuestionVoDeserializer())
+            .create()
+    }
+
+    override fun deserialize(json: JsonElement?, p1: Type?, p2: JsonDeserializationContext?): Exam {
+        val root=json?.asJsonObject
+
+        val type=root?.get("examType")?.asString
+
+        return when (gson.fromJson(type, ExamType::class.java)) {
+            ExamType.cq -> gson.fromJson(json,
+                object : TypeToken<ChoiceQuestionVo>() {}.type)
+            ExamType.oq -> gson.fromJson(json,
+                object : TypeToken<OpenQuestionsVo>() {}.type)
+            null->throw NullPointerException("无法识别题目类型！")
+        }
+
+    }
+}

app/src/main/java/com/gyf/csams/util/HttpUtil.kt

@@ -1,6 +1,8 @@
 package com.gyf.csams.util
 
 import com.google.gson.Gson
+import com.google.gson.GsonBuilder
+import com.gyf.csams.association.model.Exam
 import com.orhanobut.logger.Logger
 import okhttp3.*
 import okhttp3.MediaType.Companion.toMediaType
@@ -93,10 +95,18 @@ object HttpClient{
 
 data class ApiResponse<T>(val code:Int,val message:String,val body:T?=null)
 
+
 class SimpleCallback<T>(private val action:String,
                         private val onSuccess:(res:ApiResponse<T>) -> Unit,
                         private val onFail:(error:String) -> Unit,
                         private val type: Type):Callback{
+
+    companion object{
+        val gson: Gson =GsonBuilder()
+            .registerTypeAdapter(Exam::class.java,ExamDeserializer())
+            .create()
+    }
+
     override fun onFailure(call: Call, e: IOException) {
         onFail("${action}失败，请联系管理员")
         Logger.e(e,"${action}请求失败，发生IO异常")
@@ -107,7 +117,7 @@ class SimpleCallback<T>(private val action:String,
             val body=response.body
             if (body!=null&&body.contentType()?.subtype == "json") {
                 val jsonRes=body.string()
-                val res:ApiResponse<T> = Gson().fromJson(jsonRes, type)
+                val res:ApiResponse<T> = gson.fromJson(jsonRes, type)
                 Logger.i("${action}请求响应成功：")
                 Logger.json(jsonRes)
                 onSuccess(res)

app/src/main/res/drawable/ic_add_select.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="200dp"
+    android:height="200dp"
+    android:viewportWidth="1024"
+    android:viewportHeight="1024">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M544,213.33v266.67H810.67v64H544V810.67h-64V544H213.33v-64h266.67V213.33z"/>
+</vector>

app/src/main/res/drawable/ic_sami_select.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="200dp"
+    android:height="200dp"
+    android:viewportWidth="1024"
+    android:viewportHeight="1024">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M810.67,480v64H213.33v-64z"/>
+</vector>

app/src/test/java/com/gyf/csams/ExampleUnitTest.kt

@@ -5,8 +5,6 @@ import com.google.gson.reflect.TypeToken
 import com.gyf.csams.util.ApiResponse
 import org.junit.Assert.assertEquals
 import org.junit.Test
-import java.time.LocalDateTime
-import java.time.temporal.ChronoField
 
 
 /**
@@ -36,7 +34,14 @@ class ExampleUnitTest {
 
     @Test
     fun testYear(){
-        println(     LocalDateTime.now().get(ChronoField.YEAR))
+        repeat(10,{
+            println(it)
+        })
+    }
+
+    @Test
+    fun testCharRange(){
+        println(('A'..'D').map { "选项$it" })
     }
 
 }

build.gradle.kts

@@ -8,13 +8,14 @@ buildscript {
     val APP_NAME by extra("大学生社团管理系统")
     val SERVER_ADDRESS by extra("http://192.168.50.107:8080")
     val room_version by extra("2.2.6")
+    val kotlin_version by extra("1.4.32")
     repositories {
         maven("https://maven.aliyun.com/repository/google")
         maven("https://maven.aliyun.com/repository/public")
     }
     dependencies {
         classpath("com.android.tools.build:gradle:7.0.0-alpha15")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.4.32")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlin_version}")
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle.kts files