使用视图模型和改造的用户登录 [英] user login using viewmodel and retrofit
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问题描述
我正在尝试使用改造和视图模型进行登录
我仅通过改造就成功登录...参考本教程-->
在登录活动中:-1-->
2-->
3-->
解决方案
class LoginActivity : BaseClassActivity() {私有 val viewModel by viewModels()覆盖 fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.login_activity)val button = findViewById(R.id.plusbutton)val forgotpassword = findViewById(R.id.forgotpassword)button.setOnClickListener {val i = Intent(applicationContext, RegisterActivity::class.java)开始活动(i)}忘记密码.setOnClickListener {val i = Intent(applicationContext, ForgotPassword::class.java)开始活动(i)}loginuser.onTextChanged {viewModel.user.value = it.toString()}loginpassword.onTextChanged {viewModel.password.value = it.toString()}loginbtn.setOnClickListener {viewModel.login()}viewModel.loginResult.observe(this) { result ->当(结果){UserMissing ->{Toast.makeText(applicationContext，数据丢失"，Toast.LENGTH_LONG).展示()loginuser.error = "需要电子邮件";loginuser.requestFocus()}密码丢失 ->{loginpassword.error = "需要密码";登录密码.requestFocus()}网络故障 ->{}网络错误 ->{showToast(applicationContext, result.userMessage)}成功 ->{val 意图 = 意图(applicationContext，HomeActivity::class.java)意图.标志 =Intent.FLAG_ACTIVITY_NEW_TASK 或 Intent.FLAG_ACTIVITY_CLEAR_TASKshowToast(applicationContext, res.body()?.message)Log.d(kjsfgxhufb", response.body()?.status.toString())开始活动(意图)结束()}}.安全的()}}}类 LoginViewModel(private val savedStateHandle: SavedStateHandle) : ViewModel() {密封类 LoginResult {对象 UserMissing : LoginResult(),对象 PasswordMissing : LoginResult(),类 NetworkError(val userMessage: String) : LoginResult(),对象 NetworkFailure : LoginResult(),对象成功:LoginResult()}val 用户:MutableLiveData= savedStateHandle.getLiveData("user", "")val 密码:MutableLiveData= savedStateHandle.getLiveData("密码", "")private val loginResultEmitter = EventEmitter()val loginResult: EventSource= loginResultEmitter有趣的登录(){val email = user.value!!.toString().trim()val 密码 = password.value!!.toString().trim()如果 (email.isEmpty()) {loginResultEmitter.emit(LoginResult.UserMissing)返回}如果(密码.isEmpty()){loginResultEmitter.emit(LoginResult.PasswordMissing)返回}RetrofitClient.instance.userLogin(email, password).enqueue(对象:回调<登录响应>{覆盖 fun onFailure(call: Call, t: Throwable) {Log.d("res", "" + t)loginResultEmitter.emit(LoginResult.NetworkFailure)}覆盖乐趣 onResponse(呼叫:呼叫<登录响应>，响应:响应<登录响应>){var res = 响应Log.d("响应检查", "" + response.body()?.status.toString())如果 (res.body()?.status == 200) {SharedPrefManager.getInstance(applicationContext).saveUser(response.body()?.data!!)loginResultEmitter.emit(LoginResult.Success)} 别的 {尝试 {val jObjError =JSONObject(response.errorBody()!!.string())loginResultEmitter.emit(LoginResult.NetworkError(jObjError.getString("user_msg")))} catch (e: 异常) {//showToast(applicationContext,e.message)//TODOLog.e("errorrr", e.message)}}}})}} 使用这个库(我写这个是因为没有，现在仍然没有任何其他库可以在不使用 SingleLiveEvent 的反模式或事件包装器的情况下正确解决这个问题)
所有项目{存储库{//...maven { url "https://jitpack.io";}}//...}实现 'com.github.Zhuinden:live-event:1.1.0'一些缺失的块来实际编译:
有趣的T.safe(): T = this//辅助方法 Gradle 中的这些依赖
实现androidx.core:core-ktx:1.3.2"；实现androidx.activity:activity-ktx:1.1.0"；实现androidx.fragment:fragment-ktx:1.2.5"；实现androidx.lifecycle:lifecycle-viewmodel-savedstate:2.2.0"；同时添加
android {编译选项{sourceCompatibility JavaVersion.VERSION_1_8targetCompatibility JavaVersion.VERSION_1_8}科特林选项{jvmTarget = 1.8"}}要访问 ViewModel 中的 applicationContext，您需要使用 AndroidViewModel 而不是 ViewModel
class LoginViewModel(私人 val 应用程序:应用程序，私有 val 保存状态句柄:保存状态句柄):AndroidViewModel(应用程序){私有 val applicationContext = 应用程序那应该可以解决它
显然是onTextChanged"在ktx中是doAfterTextChanged，我用的是这个:
inline fun EditText.onTextChanged(crossinline textChangeListener: (String) -> Unit) {addTextChangedListener(对象:TextWatcher {覆盖乐趣 afterTextChanged(editable: Editable) {textChangeListener(editable.toString())}覆盖乐趣 beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}覆盖 fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}})}im trying to do login using retrofit and viewmodel
i have done successfully login with only retrofit...referred this tutorial--> https://www.youtube.com/watch?v=j0wH0m_xYLs
i havent found any tutorial related to login using viewmodel
found this stackoverflow question but it is still unanswered --> How to make retrofit API call request method post using LiveData and ViewModel
here is my call activity:--
class LoginActivity : BaseClassActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.login_activity)
val button = findViewById<ImageView>(R.id.plusbutton)
val forgotpassword=findViewById<TextView>(R.id.forgotpassword)
button.setOnClickListener {
val i = Intent(applicationContext, RegisterActivity::class.java)
startActivity(i)
}
forgotpassword.setOnClickListener{
val i = Intent(applicationContext, ForgotPassword::class.java)
startActivity(i)
}
loginbtn.setOnClickListener {
val email = loginuser.text.toString().trim()
val password = loginpassword.text.toString().trim()
if (email.isEmpty()) {
Toast.makeText(
applicationContext, "Data is missing",Toast.LENGTH_LONG
).show()
loginuser.error = "Email required"
loginuser.requestFocus()
return@setOnClickListener
}
if (password.isEmpty()) {
loginpassword.error = "Password required"
loginpassword.requestFocus()
return@setOnClickListener
}
RetrofitClient.instance.userLogin(email, password)
.enqueue(object : Callback<LoginResponse> {
override fun onFailure(call: Call<LoginResponse>, t: Throwable) {
Log.d("res", "" + t)
}
override fun onResponse(
call: Call<LoginResponse>,
response: Response<LoginResponse>
) {
var res = response
Log.d("response check ", "" + response.body()?.status.toString())
if (res.body()?.status==200) {
SharedPrefManager.getInstance(applicationContext)
.saveUser(response.body()?.data!!)
val intent = Intent(applicationContext, HomeActivity::class.java)
intent.flags =
Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
showToast(applicationContext,res.body()?.message)
Log.d("kjsfgxhufb",response.body()?.status.toString())
startActivity(intent)
finish()
}
else
{
try {
val jObjError =
JSONObject(response.errorBody()!!.string())
showToast(applicationContext,jObjError.getString("user_msg"))
} catch (e: Exception) {
showToast(applicationContext,e.message)
Log.e("errorrr",e.message)
}
}
}
})
}
}}
Following is LoginResponse:-
data class LoginResponse(val status: Int, val data: Data, val message: String, val user_msg:String)
Data class:-
data class Data(
@SerializedName("id") val id: Int,
@SerializedName("role_id") val role_id: Int,
@SerializedName("first_name") val first_name: String?,
@SerializedName("last_name") val last_name: String?,
@SerializedName("email") val email: String?,
@SerializedName("username") val username: String?,
@SerializedName("profile_pic") val profile_pic: String?,
@SerializedName("country_id") val country_id: String?,
@SerializedName("gender") val gender: String?,
@SerializedName("phone_no") val phone_no: String,
@SerializedName("dob") val dob: String?,
@SerializedName("is_active") val is_active: Boolean,
@SerializedName("created") val created: String?,
@SerializedName("modified") val modified: String?,
@SerializedName("access_token") val access_token: String?
)
really need help desparately related to viewmodel for login
thanks in advance
Errors encountered while adding epicpandaforce answer:--
in loginviewmodel:--
in loginactivity:- 1-->
2-->
3-->
解决方案
class LoginActivity : BaseClassActivity() {
private val viewModel by viewModels<LoginViewModel>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.login_activity)
val button = findViewById<ImageView>(R.id.plusbutton)
val forgotpassword = findViewById<TextView>(R.id.forgotpassword)
button.setOnClickListener {
val i = Intent(applicationContext, RegisterActivity::class.java)
startActivity(i)
}
forgotpassword.setOnClickListener {
val i = Intent(applicationContext, ForgotPassword::class.java)
startActivity(i)
}
loginuser.onTextChanged {
viewModel.user.value = it.toString()
}
loginpassword.onTextChanged {
viewModel.password.value = it.toString()
}
loginbtn.setOnClickListener {
viewModel.login()
}
viewModel.loginResult.observe(this) { result ->
when (result) {
UserMissing -> {
Toast.makeText(
applicationContext, "Data is missing", Toast.LENGTH_LONG
).show()
loginuser.error = "Email required"
loginuser.requestFocus()
}
PasswordMissing -> {
loginpassword.error = "Password required"
loginpassword.requestFocus()
}
NetworkFailure -> {
}
NetworkError -> {
showToast(applicationContext, result.userMessage)
}
Success -> {
val intent = Intent(applicationContext, HomeActivity::class.java)
intent.flags =
Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
showToast(applicationContext, res.body()?.message)
Log.d("kjsfgxhufb", response.body()?.status.toString())
startActivity(intent)
finish()
}
}.safe()
}
}
}
class LoginViewModel(private val savedStateHandle: SavedStateHandle) : ViewModel() {
sealed class LoginResult {
object UserMissing : LoginResult(),
object PasswordMissing : LoginResult(),
class NetworkError(val userMessage: String) : LoginResult(),
object NetworkFailure : LoginResult(),
object Success : LoginResult()
}
val user: MutableLiveData<String> = savedStateHandle.getLiveData("user", "")
val password: MutableLiveData<String> = savedStateHandle.getLiveData("password", "")
private val loginResultEmitter = EventEmitter<LoginResult>()
val loginResult: EventSource<LoginResult> = loginResultEmitter
fun login() {
val email = user.value!!.toString().trim()
val password = password.value!!.toString().trim()
if (email.isEmpty()) {
loginResultEmitter.emit(LoginResult.UserMissing)
return
}
if (password.isEmpty()) {
loginResultEmitter.emit(LoginResult.PasswordMissing)
return
}
RetrofitClient.instance.userLogin(email, password)
.enqueue(object : Callback<LoginResponse> {
override fun onFailure(call: Call<LoginResponse>, t: Throwable) {
Log.d("res", "" + t)
loginResultEmitter.emit(LoginResult.NetworkFailure)
}
override fun onResponse(
call: Call<LoginResponse>,
response: Response<LoginResponse>
) {
var res = response
Log.d("response check ", "" + response.body()?.status.toString())
if (res.body()?.status == 200) {
SharedPrefManager.getInstance(applicationContext).saveUser(response.body()?.data!!)
loginResultEmitter.emit(LoginResult.Success)
} else {
try {
val jObjError =
JSONObject(response.errorBody()!!.string())
loginResultEmitter.emit(LoginResult.NetworkError(jObjError.getString("user_msg")))
} catch (e: Exception) {
// showToast(applicationContext,e.message) // TODO
Log.e("errorrr", e.message)
}
}
}
})
}
}
Using this library (that I wrote because there has not been and still isn't any other library that would solve this problem correctly without using the anti-pattern of SingleLiveEvent or the Event wrapper)
allprojects {
repositories {
// ...
maven { url "https://jitpack.io" }
}
// ...
}
implementation 'com.github.Zhuinden:live-event:1.1.0'
EDIT: some missing blocks to actually make this compile:
fun <T> T.safe(): T = this // helper method
These dependencies in Gradle
implementation "androidx.core:core-ktx:1.3.2"
implementation "androidx.activity:activity-ktx:1.1.0"
implementation "androidx.fragment:fragment-ktx:1.2.5"
implementation "androidx.lifecycle:lifecycle-viewmodel-savedstate:2.2.0"
Also add
android {
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = "1.8"
}
}
To access applicationContext in ViewModel, you'll need to use AndroidViewModel instead of ViewModel
class LoginViewModel(
private val application: Application,
private val savedStateHandle: SavedStateHandle
): AndroidViewModel(application) {
private val applicationContext = application
And that should fix it
EDIT: apparently the "onTextChanged" is doAfterTextChanged in ktx, what I use is this:
inline fun EditText.onTextChanged(crossinline textChangeListener: (String) -> Unit) {
addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(editable: Editable) {
textChangeListener(editable.toString())
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
})
}
这篇关于使用视图模型和改造的用户登录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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