如何解决带有匕首,JetPack组件的Android Kotlin MVVM
目前,我正在从事Kotlin android开发。在编写MVVM体系结构时,我陷入了ViewModel Creation的困境 错误:类文字左侧仅允许使用类
相关的类是
详细信息
BaseViewModel类,在创建此类的对象时,出现错误
package com.logicipher.mvvm.ui.base
import androidx.databinding.ObservableBoolean
import androidx.lifecycle.ViewModel
import com.logicipher.mvvm.data.DataManager
import com.logicipher.mvvm.utils.rx.SchedulerProvider
import io.reactivex.disposables.CompositeDisposable
import java.lang.ref.WeakReference
/**
* Created by Shamji N S on 20-08-2020.
*/
abstract class BaseViewModel<N>(
dataManager: DataManager,schedulerProvider: SchedulerProvider
) : ViewModel() {
private val mDataManager: DataManager
private val mIsLoading = ObservableBoolean()
private val mSchedulerProvider: SchedulerProvider
private val mCompositeDisposable: CompositeDisposable
private var mNavigator: WeakReference<N>? = null
override fun onCleared() {
mCompositeDisposable.dispose()
super.onCleared()
}
fun getCompositeDisposable(): CompositeDisposable {
return mCompositeDisposable
}
fun getDataManager(): DataManager {
return mDataManager
}
fun getIsLoading(): ObservableBoolean {
return mIsLoading
}
fun setIsLoading(isLoading: Boolean) {
mIsLoading.set(isLoading)
}
fun getNavigator(): N? {
return mNavigator!!.get()
}
fun setNavigator(navigator: N) {
mNavigator = WeakReference(navigator)
}
fun getSchedulerProvider(): SchedulerProvider {
return mSchedulerProvider
}
init {
mDataManager = dataManager
mSchedulerProvider = schedulerProvider
mCompositeDisposable = CompositeDisposable()
}
}
BaseActivity
package com.logicipher.mvvm.ui.base
import android.annotation.TargetApi
import android.app.ProgressDialog
import android.content.Context
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.view.inputmethod.InputMethodManager
import androidx.annotation.LayoutRes
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import androidx.databinding.ViewDataBinding
import com.logicipher.mvvm.utils.CommonUtils
import com.logicipher.mvvm.utils.NetworkUtils
import dagger.android.AndroidInjection
/**
* Created by Shamji N S on 20-08-2020.
*/
abstract class BaseActivity<T : ViewDataBinding?,V : BaseViewModel<*>?> :
AppCompatActivity(),BaseFragment.Callback {
// TODO
// this can probably depend on isLoading variable of BaseViewModel,// since its going to be common for all the activities
private var mProgressDialog: ProgressDialog? = null
private var mViewDataBinding: T? = null
private var mViewModel: V? = null
/**
* Override for set binding variable
*
* @return variable id
*/
abstract fun getBindingVariable(): Int
/**
* @return layout resource id
*/
@LayoutRes
abstract fun getLayoutId(): Int
/**
* Override for set view model
*
* @return view model instance
*/
abstract fun getViewModel(): V
override fun onFragmentAttached() {
}
override fun onFragmentDetached(tag: String?) {
}
override fun onCreate(savedInstanceState: Bundle?) {
performDependencyInjection()
super.onCreate(savedInstanceState)
performDataBinding()
}
fun getViewDataBinding(): T? {
return mViewDataBinding
}
@TargetApi(Build.VERSION_CODES.M)
fun hasPermission(permission: String?): Boolean {
return Build.VERSION.SDK_INT < Build.VERSION_CODES.M ||
checkSelfPermission(permission!!) == PackageManager.PERMISSION_GRANTED
}
fun hideKeyboard() {
val view = this.currentFocus
if (view != null) {
val imm =
getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm?.hideSoftInputFromWindow(view.windowToken,0)
}
}
fun hideLoading() {
if (mProgressDialog != null && mProgressDialog!!.isShowing) {
mProgressDialog!!.cancel()
}
}
fun isNetworkConnected(): Boolean {
return NetworkUtils.isNetworkConnected(applicationContext)
}
fun openActivityOnTokenExpire() {
}
fun performDependencyInjection() {
AndroidInjection.inject(this)
}
@TargetApi(Build.VERSION_CODES.M)
fun requestPermissionsSafely(
permissions: Array<String?>?,requestCode: Int
) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(permissions!!,requestCode)
}
}
fun showLoading() {
hideLoading()
mProgressDialog = CommonUtils.showLoadingDialog(this)
}
private fun performDataBinding() {
mViewDataBinding = DataBindingUtil.setContentView<T>(this,getLayoutId())
mViewModel = if (mViewModel == null) getViewModel() else mViewModel
mViewDataBinding!!.setVariable(getBindingVariable(),mViewModel)
mViewDataBinding!!.executePendingBindings()
}
}
MainActivity
package com.logicipher.mvvm.ui.main
import android.os.Bundle
import android.util.Log
import androidx.lifecycle.ViewModelProviders
import com.logicipher.mvvm.BR
import com.logicipher.mvvm.R
import com.logicipher.mvvm.ViewModelProviderFactory
import com.logicipher.mvvm.databinding.ActivityMainBinding
import com.logicipher.mvvm.ui.base.BaseActivity
import javax.inject.Inject
/**
* Created by Shamji N S on 21-08-2020.
*/
class MainActivity : BaseActivity<ActivityMainBinding?,MainViewModel<MainNavigator>?>(),MainNavigator /*,HasSupportFragmentInjector*/ {
/* @Inject
DispatchingAndroidInjector<Fragment> fragmentDispatchingAndroidInjector;*/
@set:Inject
internal var factory: ViewModelProviderFactory? = null
var mViewModel: MainViewModel<MainNavigator>? = null
var mBinding: ActivityMainBinding? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
Log.d(TAG,"onCreate: ")
mBinding = getViewDataBinding()
mViewModel?.setNavigator(this)
}
override fun getBindingVariable(): Int {
return BR.viewModel
}
override fun getLayoutId(): Int {
return R.layout.activity_main
}
override fun getViewModel(): MainViewModel<MainNavigator>? {
mViewModel =
ViewModelProviders.of(this,factory).get<MainViewModel<MainNavigator>>(MainViewModel<MainNavigator>::class.java)
return mViewModel
}
/*
@Override
public AndroidInjector<Fragment> supportFragmentInjector() {
return fragmentDispatchingAndroidInjector;
}
*/
companion object {
private const val TAG = "MainActivity"
}
}
ViewModelProviderFactory
package com.logicipher.mvvm
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider.NewInstanceFactory
import com.logicipher.mvvm.data.DataManager
import com.logicipher.mvvm.ui.main.MainNavigator
import com.logicipher.mvvm.ui.main.MainViewModel
import com.logicipher.mvvm.utils.rx.SchedulerProvider
import java.lang.IllegalArgumentException
import javax.inject.Inject
/**
* Created by Shamji N S on 25-08-2020.
*/
public class ViewModelProviderFactory @Inject constructor(
dataManager: DataManager,schedulerProvider: SchedulerProvider
) : NewInstanceFactory() {
private val dataManager: DataManager
private val schedulerProvider: SchedulerProvider
override fun <T : ViewModel?> create(modelClass: Class<T>): T {
return super.create(modelClass)
if (modelClass.isAssignableFrom(MainViewModel::class.java)) {
return MainViewModel<T>(dataManager,schedulerProvider) as T
}
throw IllegalArgumentException("Unknown view model" + modelClass.name)
}
init {
this.dataManager = dataManager
this.schedulerProvider = schedulerProvider
}
}
解决方法
您的nadir = df.apply(lambda x: calc_nadir(x),axis=1).rename('nadir')
nadir_qtr = df.apply(lambda x: calc_nadir_qtr(x),axis=1).rename('nadir_qtr')
pre_peak = df.apply(lambda x: calc_pre_peak(x),axis=1).rename('pre_peak')
pre_peak_qtr = df.apply(lambda x: calc_pre_peak_quarter(x),axis=1).rename('pre_peak_qtr')
post_peak = df.apply(lambda x: calc_post_peak(x),axis=1).rename('post_peak')
post_peak_qtr = df.apply(lambda x: calc_post_peak_qtr(x),axis=1).rename('post_peak_qtr')
results = pd.concat([nadir,nadir_qtr,pre_peak,pre_peak_qtr,post_peak,post_peak_qtr],axis=1)
print(results)
nadir nadir_qtr pre_peak pre_peak_qtr post_peak post_peak_qtr
0 4039370.0 7 4114911.0 1.0 4254681.0 11
1 21226.0 0 NaN NaN 23232.0 5
2 95958.0 7 103054.0 5.0 123064.0 9
3 22080.0 11 24186.0 2.0 22080.0 11
4 6722.0 7 7906.0 1.0 8326.0 11
是抽象的,您不能创建抽象类的对象或实例。
创建BaseViewModel
之后,创建(或获取)ViewModelFactory
实例的方法是:
ViewModel
但是,我会考虑使用val viewModel = ViewModelProvider(this,viewModelFactory).get(ViewModelName::class.java)
from here,这可以帮助减少代码。