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请教 #6

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qtybpg opened this issue Jun 27, 2019 · 42 comments
Open

请教 #6

qtybpg opened this issue Jun 27, 2019 · 42 comments

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@qtybpg
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qtybpg commented Jun 27, 2019

大佬，你定义了一个bindadapter toast，在xml中也使用了，可是该如何通过触发它呢？
@qtybpg
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qtybpg commented Jun 27, 2019

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？

@ditclear
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ditclear commented Jun 27, 2019 via email

@qtybpg
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qtybpg commented Jun 27, 2019

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。

@ditclear
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ditclear commented Jun 27, 2019 via email

@qtybpg
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qtybpg commented Jun 27, 2019

好的，大佬，之前mvc开发总是view层和model层混在一起，让我都懵了。

@ditclear
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ditclear commented Jun 27, 2019 •
edited
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不太清楚的话，可以先看看 专栏 https://xiaozhuanlan.com/topic/7590648312

@qtybpg
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qtybpg commented Jun 28, 2019

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。

@qtybpg
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qtybpg commented Jun 28, 2019

并且这个applicatoncontext是个全局变量

@ditclear
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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

@qtybpg
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qtybpg commented Jun 28, 2019

的确，我看到了koin,也猜到是这种，不过我想试试不用依赖注入的组件。

@qtybpg
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qtybpg commented Jul 1, 2019

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

@qtybpg
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qtybpg commented Jul 1, 2019

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)

        }
    }

@ditclear
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ditclear commented Jul 1, 2019

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({},{})

@qtybpg
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qtybpg commented Jul 1, 2019

嗯，好的，谢谢大佬。

@qtybpg
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qtybpg commented Jul 1, 2019

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()
}

@qtybpg
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qtybpg commented Jul 1, 2019

emmm，我卸载了以后再试就好使了，是因为我修改了我数据Bean的构造方法吗？导致表的结构对不上？

@qtybpg
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qtybpg commented Jul 12, 2019

大佬，当我使用room数据库，想在表中插入list类型的数据时，按照网上的文档出现了错误
class CityAndWeather{

@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;
}

}

@qtybpg
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qtybpg commented Jul 12, 2019

@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)

}

@ditclear
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get set方法不需要的，把private 去掉.
另外，最好附上详细的错误信息

@qtybpg
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qtybpg commented Jul 12, 2019

多谢大佬的指点，其实是我看的博客写的不全，在原作者的另一篇博客中已找到解决的方法，主要是我没加外键以及dao的原因

@qtybpg
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qtybpg commented Jul 12, 2019

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
@get("article_detail.php")
fun getArticleById(@query("id") id: Int): Single

}
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;

}

@qtybpg
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qtybpg commented Jul 12, 2019

@get("api/")
fun getWeather(@query("cityid") id: String): Single

@qtybpg
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qtybpg commented Jul 12, 2019

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
}

@qtybpg
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qtybpg commented Jul 12, 2019

而如果将接口返回的数据修改为weather，却可以收到数据

@ditclear
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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

@qtybpg
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qtybpg commented Jul 12, 2019

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。

@qtybpg
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qtybpg commented Jul 15, 2019 via email

@qtybpg
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qtybpg commented Jul 15, 2019

对了，还有这篇博客，是同一个作者https://blog.csdn.net/weixin_34304013/article/details/86842302

@ditclear
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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;
}

@qtybpg
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qtybpg commented Jul 15, 2019 via email

@qtybpg
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qtybpg commented Jul 31, 2019

大佬，看看我在你的paonet里的提问可以吗？我在看扔物线大佬写的rxjava入门中，看见了有个方法是unsubscribe，是为了解除引用，可是你在paonet中并未使用这个方法，你使用的数据类型是single，是不需要解除引用吗？

@ditclear
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unsubscribe 只是其中一种方式，现在用的较多的是AutoDispose和RxLifeCycle，达到的都是同样的效果

@qtybpg
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qtybpg commented Jul 31, 2019

好的大佬，在捋了一遍你的代码后，看见你用的是AutoDispose解除引用了

@qtybpg
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qtybpg commented Oct 11, 2019

大佬，有个问题想问下您啊，observeOn(AndroidSchedulers.mainThread())这句话如果放到single的doOn系列方法前面的话，对数据库的操作就会报错，用的是rxjava2，为什么啊？

@qtybpg
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qtybpg commented Oct 11, 2019

remote.getWeather("d4UxIgoj","51735518")
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.doOnSuccess {
local.deleteAllWeather(it.cityid)
local.insertWeather(it)
loading.set(false)
name.set(it.city)
}.doOnError{
Log.e("refresh",it.message)
error.set(it)
loading.set(false)
}
报的错误是 Cannot access database on the main thread since it may potentially lock the UI for a long period of time.

@qtybpg
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qtybpg commented Oct 11, 2019

remote.getWeather("d4UxIgoj","51735518")
.subscribeOn(Schedulers.io())
.doOnSuccess {
local.deleteAllWeather(it.cityid)
local.insertWeather(it)
loading.set(false)
name.set(it.city)
}.doOnError{
Log.e("refresh",it.message)
error.set(it)
loading.set(false)
}
.observeOn(AndroidSchedulers.mainThread())
将observeon放到doOn系列的后面就好事

@ditclear
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local.deleteAllWeather(it.cityid) 操作数据库的语句都需要放到子线程去，你把observeOn(AndroidSchedulers.mainThread())放到前面，相当于切到主线程去了，在主线程main里执行数据库操作自然会报错

@qtybpg
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qtybpg commented Oct 11, 2019

所以observerOn也影响single本身是吗？我还以为只影响single的订阅者

@ditclear
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observerOn影响在它之后的，doonsuccess在它之后，所以切换到主线程去了

@qtybpg
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qtybpg commented Oct 11, 2019

原来如此，多谢大佬

@qtybpg
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qtybpg commented Oct 14, 2019

fun loadData(isRefresh: Boolean) = if (keyWord != null) {
repo.getSearchArticles(getPage(isRefresh), keyWord)
} else {
repo.getArticleList(getPage(isRefresh), tid)
}
.async(1000)
.map { articleList ->
with(articleList) {
loadMore.set(!incomplete_results)
if (isRefresh) {
list.clear()
}
return@map items?.map { ArticleItemViewModel(it) }?.let { list.addAll(it) }
}
}
大佬，看你的paonet实例代码，这段代码有点不清楚，你在这段代码中将articlist中的item转换成List并添加到adpter的list的操作我看懂了，可是rxjava.map将articllelist转换成boolean 的返回值
return@map items?.map { ArticleItemViewModel(it) }?.let { list.addAll(it) }这一段是怎么实现返回的是boolean的呢？

@ditclear
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写麻烦了，在.async(1000)用doOnSuccess{}就好，并不需要map

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@ditclear @qtybpg