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PixelDroid-App-Android
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Code Issues Releases Wiki Activity

inital login activity

This commit is contained in:
Andrea Clement 2020-03-03 21:17:53 +01:00
parent aa788f9720
commit 746b670403
15 changed files with 434 additions and 1 deletions
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3
app/build.gradle
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@ -47,6 +47,9 @@ dependencies {
testImplementation "com.github.tomakehurst:wiremock-jre8:2.26.2"
testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
implementation 'com.google.android.material:material:1.1.0'
implementation 'androidx.annotation:annotation:1.1.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
testImplementation 'junit:junit:4.13'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

3
app/src/main/AndroidManifest.xml
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@ -9,6 +9,9 @@
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".ui.login.LoginActivity"
android:label="@string/title_activity_login"></activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

25
app/src/main/java/com/h/pixeldroid/data/LoginDataSource.kt Normal file
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@ -0,0 +1,25 @@
package com.h.pixeldroid.data
import com.h.pixeldroid.data.model.LoggedInUser
import java.io.IOException
/**
* Class that handles authentication w/ login credentials and retrieves user information.
*/
class LoginDataSource {
fun login(username: String, password: String): Result<LoggedInUser> {
try {
// TODO: handle loggedInUser authentication
val fakeUser = LoggedInUser(java.util.UUID.randomUUID().toString(), "Jane Doe")
return Result.Success(fakeUser)
} catch (e: Throwable) {
return Result.Error(IOException("Error logging in", e))
}
}
fun logout() {
// TODO: revoke authentication
}
}

46
app/src/main/java/com/h/pixeldroid/data/LoginRepository.kt Normal file
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@ -0,0 +1,46 @@
package com.h.pixeldroid.data
import com.h.pixeldroid.data.model.LoggedInUser
/**
* Class that requests authentication and user information from the remote data source and
* maintains an in-memory cache of login status and user credentials information.
*/
class LoginRepository(val dataSource: LoginDataSource) {
// in-memory cache of the loggedInUser object
var user: LoggedInUser? = null
private set
val isLoggedIn: Boolean
get() = user != null
init {
// If user credentials will be cached in local storage, it is recommended it be encrypted
// @see https://developer.android.com/training/articles/keystore
user = null
}
fun logout() {
user = null
dataSource.logout()
}
fun login(username: String, password: String): Result<LoggedInUser> {
// handle login
val result = dataSource.login(username, password)
if (result is Result.Success) {
setLoggedInUser(result.data)
}
return result
}
private fun setLoggedInUser(loggedInUser: LoggedInUser) {
this.user = loggedInUser
// If user credentials will be cached in local storage, it is recommended it be encrypted
// @see https://developer.android.com/training/articles/keystore
}
}

18
app/src/main/java/com/h/pixeldroid/data/Result.kt Normal file
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@ -0,0 +1,18 @@
package com.h.pixeldroid.data
/**
* A generic class that holds a value with its loading status.
* @param <T>
*/
sealed class Result<out T : Any> {
data class Success<out T : Any>(val data: T) : Result<T>()
data class Error(val exception: Exception) : Result<Nothing>()
override fun toString(): String {
return when (this) {
is Success<*> -> "Success[data=$data]"
is Error -> "Error[exception=$exception]"
}
}
}

9
app/src/main/java/com/h/pixeldroid/data/model/LoggedInUser.kt Normal file
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@ -0,0 +1,9 @@
package com.h.pixeldroid.data.model
/**
* Data class that captures user information for logged in users retrieved from LoginRepository
*/
data class LoggedInUser(
val userId: String,
val displayName: String
)

9
app/src/main/java/com/h/pixeldroid/ui/login/LoggedInUserView.kt Normal file
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@ -0,0 +1,9 @@
package com.h.pixeldroid.ui.login
/**
* User details post authentication that is exposed to the UI
*/
data class LoggedInUserView(
val displayName: String
//... other data fields that may be accessible to the UI
)

129
app/src/main/java/com/h/pixeldroid/ui/login/LoginActivity.kt Normal file
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@ -0,0 +1,129 @@
package com.h.pixeldroid.ui.login
import android.app.Activity
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProviders
import android.os.Bundle
import androidx.annotation.StringRes
import androidx.appcompat.app.AppCompatActivity
import android.text.Editable
import android.text.TextWatcher
import android.view.View
import android.view.inputmethod.EditorInfo
import android.widget.Button
import android.widget.EditText
import android.widget.ProgressBar
import android.widget.Toast
import com.h.pixeldroid.R
class LoginActivity : AppCompatActivity() {
private lateinit var loginViewModel: LoginViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
val username = findViewById<EditText>(R.id.username)
val password = findViewById<EditText>(R.id.password)
val login = findViewById<Button>(R.id.login)
val loading = findViewById<ProgressBar>(R.id.loading)
loginViewModel = ViewModelProviders.of(this, LoginViewModelFactory())
.get(LoginViewModel::class.java)
loginViewModel.loginFormState.observe(this@LoginActivity, Observer {
val loginState = it ?: return@Observer
// disable login button unless both username / password is valid
login.isEnabled = loginState.isDataValid
if (loginState.usernameError != null) {
username.error = getString(loginState.usernameError)
}
if (loginState.passwordError != null) {
password.error = getString(loginState.passwordError)
}
})
loginViewModel.loginResult.observe(this@LoginActivity, Observer {
val loginResult = it ?: return@Observer
loading.visibility = View.GONE
if (loginResult.error != null) {
showLoginFailed(loginResult.error)
}
if (loginResult.success != null) {
updateUiWithUser(loginResult.success)
}
setResult(Activity.RESULT_OK)
//Complete and destroy login activity once successful
finish()
})
username.afterTextChanged {
loginViewModel.loginDataChanged(
username.text.toString(),
password.text.toString()
)
}
password.apply {
afterTextChanged {
loginViewModel.loginDataChanged(
username.text.toString(),
password.text.toString()
)
}
setOnEditorActionListener { _, actionId, _ ->
when (actionId) {
EditorInfo.IME_ACTION_DONE ->
loginViewModel.login(
username.text.toString(),
password.text.toString()
)
}
false
}
login.setOnClickListener {
loading.visibility = View.VISIBLE
loginViewModel.login(username.text.toString(), password.text.toString())
}
}
}
private fun updateUiWithUser(model: LoggedInUserView) {
val welcome = getString(R.string.welcome)
val displayName = model.displayName
// TODO : initiate successful logged in experience
Toast.makeText(
applicationContext,
"$welcome $displayName",
Toast.LENGTH_LONG
).show()
}
private fun showLoginFailed(@StringRes errorString: Int) {
Toast.makeText(applicationContext, errorString, Toast.LENGTH_SHORT).show()
}
}
/**
* Extension function to simplify setting an afterTextChanged action to EditText components.
*/
fun EditText.afterTextChanged(afterTextChanged: (String) -> Unit) {
this.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(editable: Editable?) {
afterTextChanged.invoke(editable.toString())
}
override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
})
}

10
app/src/main/java/com/h/pixeldroid/ui/login/LoginFormState.kt Normal file
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@ -0,0 +1,10 @@
package com.h.pixeldroid.ui.login
/**
* Data validation state of the login form.
*/
data class LoginFormState(
val usernameError: Int? = null,
val passwordError: Int? = null,
val isDataValid: Boolean = false
)

9
app/src/main/java/com/h/pixeldroid/ui/login/LoginResult.kt Normal file
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@ -0,0 +1,9 @@
package com.h.pixeldroid.ui.login
/**
* Authentication result : success (user details) or error message.
*/
data class LoginResult(
val success: LoggedInUserView? = null,
val error: Int? = null
)

55
app/src/main/java/com/h/pixeldroid/ui/login/LoginViewModel.kt Normal file
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@ -0,0 +1,55 @@
package com.h.pixeldroid.ui.login
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import android.util.Patterns
import com.h.pixeldroid.data.LoginRepository
import com.h.pixeldroid.data.Result
import com.h.pixeldroid.R
class LoginViewModel(private val loginRepository: LoginRepository) : ViewModel() {
private val _loginForm = MutableLiveData<LoginFormState>()
val loginFormState: LiveData<LoginFormState> = _loginForm
private val _loginResult = MutableLiveData<LoginResult>()
val loginResult: LiveData<LoginResult> = _loginResult
fun login(username: String, password: String) {
// can be launched in a separate asynchronous job
val result = loginRepository.login(username, password)
if (result is Result.Success) {
_loginResult.value =
LoginResult(success = LoggedInUserView(displayName = result.data.displayName))
} else {
_loginResult.value = LoginResult(error = R.string.login_failed)
}
}
fun loginDataChanged(username: String, password: String) {
if (!isUserNameValid(username)) {
_loginForm.value = LoginFormState(usernameError = R.string.invalid_username)
} else if (!isPasswordValid(password)) {
_loginForm.value = LoginFormState(passwordError = R.string.invalid_password)
} else {
_loginForm.value = LoginFormState(isDataValid = true)
}
}
// A placeholder username validation check
private fun isUserNameValid(username: String): Boolean {
return if (username.contains('@')) {
Patterns.EMAIL_ADDRESS.matcher(username).matches()
} else {
username.isNotBlank()
}
}
// A placeholder password validation check
private fun isPasswordValid(password: String): Boolean {
return password.length > 5
}
}

25
app/src/main/java/com/h/pixeldroid/ui/login/LoginViewModelFactory.kt Normal file
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@ -0,0 +1,25 @@
package com.h.pixeldroid.ui.login
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import com.h.pixeldroid.data.LoginDataSource
import com.h.pixeldroid.data.LoginRepository
/**
* ViewModel provider factory to instantiate LoginViewModel.
* Required given LoginViewModel has a non-empty constructor
*/
class LoginViewModelFactory : ViewModelProvider.Factory {
@Suppress("UNCHECKED_CAST")
override fun <T : ViewModel> create(modelClass: Class<T>): T {
if (modelClass.isAssignableFrom(LoginViewModel::class.java)) {
return LoginViewModel(
loginRepository = LoginRepository(
dataSource = LoginDataSource()
)
) as T
}
throw IllegalArgumentException("Unknown ViewModel class")
}
}

78
app/src/main/res/layout/activity_login.xml Normal file
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@ -0,0 +1,78 @@
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".ui.login.LoginActivity">
<EditText
android:id="@+id/username"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginTop="96dp"
android:layout_marginEnd="24dp"
android:hint="@string/prompt_email"
android:inputType="textEmailAddress"
android:selectAllOnFocus="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/password"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="24dp"
android:hint="@string/prompt_password"
android:imeActionLabel="@string/action_sign_in_short"
android:imeOptions="actionDone"
android:inputType="textPassword"
android:selectAllOnFocus="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/username" />
<Button
android:id="@+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:layout_marginStart="48dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="48dp"
android:layout_marginBottom="64dp"
android:enabled="false"
android:text="@string/action_sign_in"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/password"
app:layout_constraintVertical_bias="0.2" />
<ProgressBar
android:id="@+id/loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginStart="32dp"
android:layout_marginTop="64dp"
android:layout_marginEnd="32dp"
android:layout_marginBottom="64dp"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/password"
app:layout_constraintStart_toStartOf="@+id/password"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.3" />
</androidx.constraintlayout.widget.ConstraintLayout>

5
app/src/main/res/values/dimens.xml Normal file
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@ -0,0 +1,5 @@
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="activity_horizontal_margin">16dp</dimen>
<dimen name="activity_vertical_margin">16dp</dimen>
</resources>

9
app/src/main/res/values/strings.xml
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@ -1,3 +1,12 @@
<resources>
<string name="app_name">PixelDroid</string>
<string name="title_activity_login">Sign in</string>
<string name="prompt_email">Email</string>
<string name="prompt_password">Password</string>
<string name="action_sign_in">Sign in or register</string>
<string name="action_sign_in_short">Sign in</string>
<string name="welcome">"Welcome !"</string>
<string name="invalid_username">Not a valid username</string>
<string name="invalid_password">Password must be >5 characters</string>
<string name="login_failed">"Login failed"</string>
</resources>