ditclear
请教
大佬，我突然想到，在你的paoactivity中将调用dispatchFailure改为mViewModel.error.set(it)，可以触发。我这种写法正确吗？
没什么意义吧
------------------ 原始邮件 ------------------ 发件人: "qtybpg"[email protected]; 发送时间: 2019年6月27日(星期四) 上午10:48 收件人: "ditclear/MVVM-Android"[email protected]; 抄送: "Subscribed"[email protected]; 主题: Re: [ditclear/MVVM-Android] 请教 (#6)
大佬，我突然想到，在你的paoactivity中将调用dispatchFailure改为mViewModel.error.set(it)，可以触发。我这种写法正确吗？
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我认为所有涉及到Android系统的，比如activity、fragment、context 的东西都算是view层的，toast要用到context ，所以应该算是View层的东西
------------------ 原始邮件 ------------------ 发件人: "qtybpg"[email protected]; 发送时间: 2019年6月27日(星期四) 中午11:08 收件人: "ditclear/MVVM-Android"[email protected]; 抄送: "ditclear"[email protected]; "Comment"[email protected]; 主题: Re: [ditclear/MVVM-Android] 请教 (#6)
好的，主要是我现在处于初学mvvm的状态，toast中传的this也是可以视为在view层传入的吗？之前一直在用mvc，弄的我现在有点懵了。
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大佬，我目前正在参照你的项目写demo，看了你的前三篇后，有个疑问，你数据库的applicationcontext是自己新建了一个类继承了application吗？从而获得了applicationcontext。
一般来说是这样的，使用Koin之后，可以通过androidApplication()方法获取到，在PaoApp.kt里startKoin的时候就赋值了
fun getWeather()=local.getArticleById(8773).onErrorResumeNext( // Log.e("weather","no localweather") remote.getArticleById(8773) .doOnSuccess { Log.e("weather",it.content) local.insertArticle(it) }.doOnError{ Log.e("weather",it.message) }.doFinally { Log.e("weather","final")
}
)
大佬，我使用了你获得数据的api和同样的bean，可是并没有走doOn系列的方法。您能告诉我问题出现在哪吗？因为连log都没
val remote= Retrofit.Builder() .baseUrl("http://api.jcodecraeer.com/") .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create()) .build().create(WeatherService::class.java) val local =TestDataBase.getInstance(getAppConText()).getArticalDao();
val weatherRepo=WeatherRepo(remote,local);
fun getWeather(){
weatherRepo.getWeather()
.async(1000)
.doOnSuccess { result:Article->
result.let {
weatherdara.set(it.content)
}
}
你没有订阅
val weatherRepo=WeatherRepo(remote,local);
fun getWeather(){
weatherRepo.getWeather()
.async(1000)
.doOnSuccess { result:Article->
result.let {
weatherdara.set(it.content)
}
}.subscribe({},{})
大佬，当我打算插入新数据时，attempt to re-open an already-closed object: SQLiteDatabase:编译器给我推送了这个异常，网上搜到的都和我的情况不太相似。 abstract fun getPersonDao():PersonDao abstract fun getWeatherDao():WeatherDao abstract fun getArticalDao():PaoDao companion object {
@Volatile private var INSTANCE: TestDataBase? = null
fun getInstance(context: Context): TestDataBase =
INSTANCE ?: synchronized(this) {
INSTANCE ?: buildDatabase(context).also { INSTANCE = it }
}
private fun buildDatabase(context: Context) =
Room.databaseBuilder(context.applicationContext,
TestDataBase::class.java, "Test.db")
.build()
}
大佬，当我使用room数据库，想在表中插入list
@Embedded
public var weather:Weather?=null
@Relation(parentColumn = "id",entityColumn = "cityId",entity = WeatherData::class)
public var data:List<WeatherData>?=null;
}
@Entity(tableName = "weather") class Weather{ @PrimaryKey @ColumnInfo(name = "id") @NonNull private var cityid: String?=null @ColumnInfo(name = "updatetime") private var update_time: String? = null @ColumnInfo(name = "city") private var city: String? = null @ColumnInfo(name = "city_En") private var cityEn: String? = null @ColumnInfo(name = "country") private var country: String? = null @ColumnInfo(name = "country_En") private var countryEn: String? = null
fun getCityid(): String? {
return cityid
}
fun setCityid(cityid: String) {
this.cityid = cityid
}
fun getUpdate_time(): String? {
return update_time
}
fun setUpdate_time(update_time: String) {
this.update_time = update_time
}
fun getCity(): String? {
return city
}
fun setCity(city: String) {
this.city = city
}
fun getCityEn(): String? {
return cityEn
}
fun setCityEn(cityEn: String) {
this.cityEn = cityEn
}
fun getCountry(): String? {
return country
}
fun setCountry(country: String) {
this.country = country
}
fun getCountryEn(): String? {
return countryEn
}
fun setCountryEn(countryEn: String) {
this.countryEn = countryEn
}
}
@Entity class WeatherData{ @PrimaryKey @ColumnInfo(name = "day") @NonNull private var day: String?=null @ColumnInfo(name = "cityId") private var cityId:String ?=null @ColumnInfo(name = "date") private var date: String? = null @ColumnInfo(name = "week") private var week: String? = null @ColumnInfo(name = "wea") private var wea: String? = null @ColumnInfo(name = "tem1") private var tem1: String? = null @ColumnInfo(name = "tem2") private var tem2: String? = null @ColumnInfo(name = "tem3") private var tem3: String? = null
fun getDay(): String? { return day; }
fun setDay(day:String) { this.day=day; } fun getCityId(): String? { return cityId; } fun setCityId(cityid:String) { this.cityId=cityid; }
fun getDate():String? { return date; } fun setDate(date:String) { this.date=date; }
fun getWeek():String?{ return week; }
fun setWeek(week:String) { this.week=week; } fun getWea():String? { return wea; } fun setWea(wea:String) { this.wea=wea; }
fun getTem1():String?{ return tem1; }
fun setTem1(tem1:String) { this.tem1=tem1; } fun getTem2():String?{ return tem1; } fun setTem2(tem2:String) { this.tem2=tem2; } fun getTem3():String?{ return tem1; }
fun setTem3(tem3:String) { this.tem3=tem3; }
}
@Dao interface WeatherDao {
@Query("SELECT * FROM weather WHERE id = 101190401")
fun getWeatherById(): Single<CityAndWeather>
@Insert(onConflict = OnConflictStrategy.REPLACE)
fun insertWeather(weather: CityAndWeather)
/**
* Delete all users.
*/
@Query("DELETE FROM weather")
fun deleteAllWeather()
@Update(onConflict = OnConflictStrategy.REPLACE)
fun updateWeather(CityAndWeather: Weather)
}
大佬，获取网上的数据，返回的却是空值，用的是嵌入的方式。 这是retrofit val remote= Retrofit.Builder() .baseUrl("https://www.tianqiapi.com/") .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create()) .build().create(WeatherService::class.java) 这是service interface WeatherService{ /** * 文章详情 */ @GET("api/") fun getWeather(@Query("cityid") id: String): Single<CityAndWeather> @GET("article_detail.php") fun getArticleById(@Query("id") id: Int): Single<Article>
} 这是实体类 class CityAndWeather{
@Embedded
public var weather:Weather?=null
@Relation(parentColumn = "id",entityColumn = "cityId",entity = WeatherData::class)
public var data:List<WeatherData>?=null;
}
@get("api/") fun getWeather(@query("cityid") id: String): Single<CityAndWeather>
打断点可以发现weather是null，而data里的item中cityid也为空 这是修改后的weather和weatherdata
@Entity(tableName = "weather") class Weather{ @PrimaryKey @ColumnInfo(name = "id") @NonNull public var cityid: String?=null @ColumnInfo(name = "updatetime") public var update_time: String? = null @ColumnInfo(name = "city") public var city: String? = null @ColumnInfo(name = "city_En") public var cityEn: String? = null @ColumnInfo(name = "country") public var country: String? = null @ColumnInfo(name = "country_En") public var countryEn: String? = null }
@Entity(foreignKeys = arrayOf(ForeignKey(entity = Weather::class, parentColumns = arrayOf("id"), childColumns = arrayOf("cityId"),onDelete = CASCADE)),tableName = "weatherdata") class WeatherData{ @PrimaryKey @ColumnInfo(name = "day") @NonNull public var day: String?=null @ColumnInfo(name = "cityId") public var cityId:String ?=null @ColumnInfo(name = "date") public var date: String? = null @ColumnInfo(name = "week") public var week: String? = null @ColumnInfo(name = "wea") public var wea: String? = null @ColumnInfo(name = "tem1") public var tem1: String? = null @ColumnInfo(name = "tem2") public var tem2: String? = null @ColumnInfo(name = "tem3") public var tem3: String? = null }
emm，如果说api返回的模型使用的是weather而不是CityAndWeather的话是能获取到的，不过weather是使用注解@embedded嵌入CityAndWeather中。所以获取不到数据。
打断点可以发现，当我使用嵌入的时候，同样的接口，模型为CityAndWeather时，嵌入的weather是null，而模型为Weather时，却能获取到数据 可是根据我对这篇博客的理解：https://blog.csdn.net/weixin_33785108/article/details/86842299 嵌入的实体应该是能获取到数据的，请大佬给我答疑一下，谢谢。 ------------------ 原始邮件 ------------------ 发件人: "D•IT•CLEAR"[email protected]; 发送时间: 2019年7月12日(星期五) 下午3:04 收件人: "ditclear/MVVM-Android"[email protected]; 抄送: "弃天永不破格"[email protected];"Author"[email protected]; 主题: Re: [ditclear/MVVM-Android] 请教 (#6)
https://www.tianqiapi.com/api/?cityid=shanghai 接口是有返回数据的，看你模型是否对的上
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对了，还有这篇博客，是同一个作者https://blog.csdn.net/weixin_34304013/article/details/86842302
返回的模型是这样的
按你现有的模型解析当然会不对，应该如下：
class CityAndWeather{
@PrimaryKey
@ColumnInfo(name = "id")
@nonnull
var cityid: String?=null
@ColumnInfo(name = "updatetime")
var update_time: String? = null
@ColumnInfo(name = "city")
var city: String? = null
@ColumnInfo(name = "city_En")
var cityEn: String? = null
@Relation(parentColumn = "id",entityColumn = "cityId",entity = WeatherData::class)
public var data:List<WeatherData>?=null;
}
按照大佬你的写法的确实能解析了，可是data里关联的外键仍然为null,因为data关联的表为Weather
------------------ 原始邮件 ------------------ 发件人: "D•IT•CLEAR"[email protected]; 发送时间: 2019年7月15日(星期一) 上午10:36 收件人: "ditclear/MVVM-Android"[email protected]; 抄送: "弃天永不破格"[email protected];"Author"[email protected]; 主题: Re: [ditclear/MVVM-Android] 请教 (#6)
返回的模型是这样的
按你现有的模型解析当然会不对，应该如下： class CityAndWeather{ @PrimaryKey @ColumnInfo(name = "id") @nonnull var cityid: String?=null @ColumnInfo(name = "updatetime") var update_time: String? = null @ColumnInfo(name = "city") var city: String? = null @ColumnInfo(name = "city_En") var cityEn: String? = null @Relation(parentColumn = "id",entityColumn = "cityId",entity = WeatherData::class) public var data:List<WeatherData>?=null; }
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