Java 房间中的数据访问对象类(android)是';t功能
我正在使用tasks应用程序,我想使用Room保存我的数据。所以我创建了3个必需的类。但是,在我的Java 房间中的数据访问对象类(android)是';t功能,java,android,android-room,Java,Android,Android Room,我正在使用tasks应用程序,我想使用Room保存我的数据。所以我创建了3个必需的类。但是,在我的DAO类中,我的@Query语句不起作用,因为它说: 无法解析某些符号 我不知道为什么会这样。请帮忙 子任务详细信息的代码(第一类): DAO类的代码: package com.example.taskmasterv3; import java.util.List; import androidx.room.Dao; import a
DAO类中,我的@Query
语句不起作用,因为它说:
无法解析某些符号
我不知道为什么会这样。请帮忙
子任务详细信息的代码(第一类):
DAO类的代码:
package com.example.taskmasterv3;
import java.util.List;
import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
@Dao
public interface UserDao {
@Query("SELECT * FROM subtaskDetails")
List<SubtaskDetails> getAll();
@Query("SELECT * FROM subtaskDetails WHERE uid = :id")
List<SubtaskDetails> loadAllById(int id);
@Insert
void insertAll(SubtaskDetails... users);
@Delete
void delete(SubtaskDetails user);
@Query("DELETE FROM SubtaskDetails")
void deleteAll();
}
package com.example.taskmasterv3;
import android.content.Context;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;
@Database(entities = {SubtaskDetails.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract UserDao userDao();
private static volatile AppDatabase INSTANCE;
private static final int NUMBER_OF_THREADS = 1;
static final ExecutorService databaseWriteExecutor =
Executors.newFixedThreadPool(NUMBER_OF_THREADS);
static AppDatabase getDatabase(final Context context) {
if (INSTANCE == null) {
synchronized (AppDatabase.class){
if (INSTANCE == null){
INSTANCE = Room.databaseBuilder(context.getApplicationContext(),AppDatabase.class, "subtaskDatabase").build();
}
}
}
return INSTANCE;
}
编辑:
package com.example.taskmasterv3;
import java.util.List;
import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
@Dao
public interface UserDao {
@Query("SELECT * FROM subtaskDetails")
List<SubtaskDetails> getAll();
@Query("SELECT * FROM subtaskDetails WHERE uid = :id")
List<SubtaskDetails> loadAllById(int id);
@Insert
void insertAll(SubtaskDetails... users);
@Delete
void delete(SubtaskDetails user);
@Query("DELETE FROM SubtaskDetails")
void deleteAll();
}
package com.example.taskmasterv3;
import android.content.Context;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;
@Database(entities = {SubtaskDetails.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract UserDao userDao();
private static volatile AppDatabase INSTANCE;
private static final int NUMBER_OF_THREADS = 1;
static final ExecutorService databaseWriteExecutor =
Executors.newFixedThreadPool(NUMBER_OF_THREADS);
static AppDatabase getDatabase(final Context context) {
if (INSTANCE == null) {
synchronized (AppDatabase.class){
if (INSTANCE == null){
INSTANCE = Room.databaseBuilder(context.getApplicationContext(),AppDatabase.class, "subtaskDatabase").build();
}
}
}
return INSTANCE;
}
类,我尝试在其中使用此:
package com.example.taskmasterv3;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.room.Dao;
import androidx.room.Database;
import androidx.room.Delete;
import androidx.room.Entity;
import androidx.room.Insert;
import androidx.room.PrimaryKey;
import androidx.room.Query;
import androidx.room.Room;
import androidx.room.RoomDatabase;
import android.content.Intent;
import android.database.SQLException;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class SubtaskActivity extends AppCompatActivity {
EditText etSubtaskName;
EditText etTaskName;
Button btnDone, btnCancel;
RadioGroup radgrpPri, radgrpTime;
RadioButton radbtnPriHigh, radbtnPriMed, radbtnPriLow, radbtnTimeMore, radbtnTimeMed, radbtnTimeLess;
boolean priHigh, priMed, priLow, timeMore, timeMed, timeLess;
String subtaskName;
String pri;
String time;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_subtask);
btnDone = findViewById(R.id.btnDone);
radgrpPri = findViewById(R.id.radgrpPri);
radgrpTime = findViewById(R.id.radgrpTime);
radbtnPriHigh = findViewById(R.id.radbtnPriHigh);
radbtnPriMed = findViewById(R.id.radbtnPriMed);
radbtnPriLow = findViewById(R.id.radbtnPriLow);
radbtnTimeMore = findViewById(R.id.radbtnTimeMore);
radbtnTimeMed = findViewById(R.id.radbtnTimeMed);
radbtnTimeLess = findViewById(R.id.radbtnTimeLess);
etSubtaskName = findViewById(R.id.etSubtaskName);
btnCancel = findViewById(R.id.btnCancel);
radgrpPri.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (radbtnPriHigh.isChecked())
{
priHigh = true;
priLow = false;
priMed = false;
pri = "h";
}
else if (radbtnPriMed.isChecked())
{
priHigh = false;
priLow = false;
priMed = true;
pri = "m";
}
else if (radbtnPriLow.isChecked())
{
priHigh = false;
priLow = true;
priMed = false;
pri = "l";
}
else {
priLow = true;
pri = "l";
}
}
});
radgrpTime.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if (radbtnTimeMore.isChecked())
{
timeMore = true;
timeMed = false;
timeLess = false;
time = "more";
}
else if (radbtnTimeMed.isChecked())
{
timeMore = false;
timeMed = true;
timeLess = false;
time = "med";
}
else if (radbtnTimeLess.isChecked())
{
timeMore = false;
timeMed = false;
timeLess = true;
time = "less";
}
else
{
timeLess = true;
time = "less";
}
}
});
btnDone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name = etSubtaskName.getText().toString().trim();
Intent intent = new Intent(SubtaskActivity.this, TaskInfo.class);
intent.putExtra("subtaskName", name);
intent.putExtra("priHigh", priHigh);
intent.putExtra("priMed", priMed);
intent.putExtra("priLow", priLow);
intent.putExtra("timeMore", timeMore);
intent.putExtra("timeMed", timeMed);
intent.putExtra("timeLess", timeLess);
setResult(RESULT_OK, intent);
SubtaskActivity.this.finish();
AsyncTask.execute(new Runnable() {
@Override
public void run() {
SubtaskDetails subtaskDetails = new SubtaskDetails(etSubtaskName.toString().trim(), pri, time);
AppDatabase.getDatabase(getApplicationContext()).userDao().insertAll(subtaskDetails);
}
});
AppDatabase.databaseWriteExecutor.execute(new Runnable() {
@Override
public void run() {
List<SubtaskDetails> users = AppDatabase.getDatabase(getApplicationContext()).userDao().getAll();
for(SubtaskDetails subtaskDetails : users) {
Log.d("User", subtaskDetails.getDebugString());
}
}
});
}
});
btnCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
etSubtaskName.setText("");
radgrpPri.clearCheck();
radgrpTime.clearCheck();
finish();
}
});
}
}
package com.example.taskmasterv3;
导入androidx.annotation.Nullable;
导入androidx.appcompat.app.appcompat活动;
导入androidx.room.Dao;
导入androidx.room.Database;
导入androidx.room.Delete;
导入androidx.room.Entity;
导入androidx.room.Insert;
导入androidx.room.PrimaryKey;
导入androidx.room.Query;
导入androidx.room.room;
导入androidx.room.RoomDatabase;
导入android.content.Intent;
导入android.database.SQLException;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.Button;
导入android.widget.EditText;
导入android.widget.LinearLayout;
导入android.widget.RadioButton;
导入android.widget.RadioGroup;
导入android.widget.Toast;
导入java.util.ArrayList;
导入java.util.List;
公共类子TaskActivity扩展了AppCompatActivity{
编辑文本etSubtaskName;
编辑文本;
按钮btnDone,btnCancel;
放射组radgrpPri,radgrpTime;
无线按钮RADBTNPRIGH、RADBTNPRIGH、radbtnPriLow、RADBTNTIMEROME、radbtnTimeMed、radbtnTimeLess;
布尔priHigh、priMed、priLow、timeMore、timeMed、timeLess;
字符串子任务;
字符串优先级;
串时间;
@凌驾
创建时受保护的void(@Nullable Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_子任务);
btnDone=findViewById(R.id.btnDone);
radgrpPri=findViewById(R.id.radgrpPri);
radgrpTime=findViewById(R.id.radgrpTime);
radbtnPriHigh=findViewById(R.id.radbtnPriHigh);
radbtnprimmed=findViewById(R.id.radbtnprimmed);
radbtnPriLow=findViewById(R.id.radbtnPriLow);
RADBTNTIMORE=findViewById(R.id.RADBTNTIMORE);
radbtnTimeMed=findViewById(R.id.radbtnTimeMed);
radbtnTimeLess=findViewById(R.id.radbtnTimeLess);
etSubtaskName=findViewById(R.id.etSubtaskName);
btnCancel=findViewById(R.id.btnCancel);
radgrpPri.setOnCheckedChangeListener(新的RadioGroup.OnCheckedChangeListener(){
@凌驾
检查更改后的公共无效(RadioGroup组,int checkedId){
if(radbtnPriHigh.isChecked())
{
priHigh=真;
priLow=假;
启动=错误;
pri=“h”;
}
else if(radbtnprimmed.isChecked())
{
priHigh=假;
priLow=假;
准备就绪=正确;
pri=“m”;
}
else if(radbtnPriLow.isChecked())
{
priHigh=假;
priLow=真;
启动=错误;
pri=“l”;
}
否则{
priLow=真;
pri=“l”;
}
}
});
radgrpTime.setOnCheckedChangeListener(新的RadioGroup.OnCheckedChangeListener(){
@凌驾
检查更改后的公共无效(RadioGroup组,int checkedId){
if(radbtnTimeMore.isChecked())
{
timeMore=true;
timeMed=false;
永恒=虚假;
时间=“更多”;
}
else if(radbtnTimeMed.isChecked())
{
timeMore=false;
timeMed=真;
永恒=虚假;
time=“med”;
}
else if(radbtnTimeLess.isChecked())
{
timeMore=false;
timeMed=false;
永恒=真实;
时间=“更少”;
}
其他的
{
永恒=真实;
时间=“更少”;
}
}
});
btnDone.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
字符串名称=etSubtaskName.getText().toString().trim();
意向意向=新意向(SubtaskActivity.this、TaskInfo.class);
intent.putExtra(“subtaskName”,名称);
意向。额外(“priHigh”,priHigh);
意向。额外(“涂底漆”,涂底漆);
意图。putExtra(“priLow”,priLow);
intent.putExtra(“timeMore”,timeMore);
意向。putExtra(“timeMed”,timeMed);
意图。putExtra(“永恒的”,永恒的);
设置结果(结果正常,意图);
subtaskaActivity.this.finish();
AsyncTask.execute(新的Runnable(){
@凌驾
公开募捐{
SubtaskDetails SubtaskDetails=新的SubtaskDetails(etSubtaskName.toString().trim(),pri,time);
AppDatabase.getDatabase(getApplicationContext()).userDao().insertAll(subtaskDetails);
}
});
AppDatabase.databaseWriteExecutor.execute(new Runnable()){
@凌驾
公开募捐{
List users=AppDatabase.getDatabase(getApplicationContext()).userDao().getAll();
@Entity
public class SubtaskDetails {
String subbuname, subbupri, subbutime;
....