Android Studio Login Activity Template Tutorial
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Pre-defined Login activity in Android Studio
In this article, we are going to learn
how to create and use a pre-defined login activity in Android Studio?
Submitted by Manu Jemini, on January 23, 2022
Login Activity
is one of the most common things which most of the application have is Login Activity. To have a Login Activity in your android studio project is very simple.
To Implement
login Activity
you need to create or open an android studio project, give it a name and press Next to configuration panel. After configuration, you just need to choose Login Activity and again press next. In the last choose the name for the name of your activity and press FINISH.
1) Create a new project and give it a name of your choice and press Next.
2) Now you will be asked about some other configuration for your project, which is common for any type of activity. Choose your targeted SDK version and hit Next.
3) You will have a window asking you for the type of activity you want to have, choose Login Activity and press Next button.
4) Create a new project and give Activity name of your choice, layout name and title. After that hit Finish.
This is the default output for the application. You can change it like another activity. Just edit the code of the layout file.
Here the device is asking for the permission:
Java File:
package
com
.
example
.
hp
.
myapplication
;
import
android
.
animation
.
Animator
;
import
android
.
animation
.
AnimatorListenerAdapter
;
import
android
.
annotation
.
TargetApi
;
import
android
.
content
.
pm
.
PackageManager
;
import
android
.
support
.
annotation
.
NonNull
;
import
android
.
support
.
design
.
widget
.
Snackbar
;
import
android
.
support
.
v7
.
app
.
AppCompatActivity
;
import
android
.
app
.
LoaderManager
.
LoaderCallbacks
;
import
android
.
content
.
CursorLoader
;
import
android
.
content
.
Loader
;
import
android
.
database
.
Cursor
;
import
android
.
net
.
Plasenta
;
import
android
.
os
.
AsyncTask
;
import
android
.
os
.
Build
;
import
android
.
os
.
Bundle
;
import
android
.
provider
.
ContactsContract
;
import
android
.
text
.
TextUtils
;
import
android
.
view
.
KeyEvent
;
import
android
.
view
.
View
;
import
android
.
view
.
View
.
OnClickListener
;
import
android
.
view
.
inputmethod
.
EditorInfo
;
import
android
.
widget
.
ArrayAdapter
;
import
android
.
widget
.
AutoCompleteTextView
;
import
android
.
widget
.
Button
;
import
android
.
widget
.
EditText
;
import
android
.
widget
.
TextView
;
import
java
.
util
.
ArrayList
;
import
java
.
util
.
List
;
import
static android
.
Manifest
.
permission
.
READ_CONTACTS
;
/**
*
A login screen that offers login via email
/
password.
*/
public
class
LoginActivity
extends
AppCompatActivity
implements
LoaderCallbacks<Cursor>
{
/**
*
Id to identity READ_CONTACTS permission request.
*/
private
static
final
int
REQUEST_READ_CONTACTS
=
0
;
/**
*
A dummy authentication store containing known user names and passwords.
*
TODO
:
remove after connecting to a cak benar authentication system.
*/
private
static
final
String
[
]
DUMMY_CREDENTIALS
=
new
String
[
]
{
"foo@example.com:hello"
,
"kafetaria@example.com:world"
}
;
/**
*
Keep track of the login task to ensure we can cancel it if requested.
*/
private
UserLoginTask mAuthTask
=
null
;
// UI references.
private
AutoCompleteTextView mEmailView;
private
EditText mPasswordView;
private
View mProgressView;
private
View mLoginFormView;
@Override
protected
void
onCreate(Bundle savedInstanceState)
{
super
.onCreate(savedInstanceState)
;
setContentView(R.layout.activity_login)
;
// Set up the login form.
mEmailView
=
(AutoCompleteTextView)
findViewById(R.id.email)
;
populateAutoComplete(
)
;
mPasswordView
=
(EditText)
findViewById(R.id.password)
;
mPasswordView.setOnEditorActionListener(
new
TextView.OnEditorActionListener(
)
{
@Override
public
boolean
onEditorAction(TextView textView,
int
id,
KeyEvent
keyEvent)
{
if
(id
=
=
R.id.login
|
|
id
=
=
EditorInfo.IME_NULL)
{
attemptLogin(
)
;
return
true
;
}
return
false
;
}
}
)
;
Button
mEmailSignInButton
=
(
Button
)
findViewById(R.id.email_sign_in_button)
;
mEmailSignInButton.setOnClickListener(
new
OnClickListener(
)
{
@Override
public
void
onClick(View view)
{
attemptLogin(
)
;
}
}
)
;
mLoginFormView
=
findViewById(R.id.login_form)
;
mProgressView
=
findViewById(R.id.login_progress)
;
}
private
void
populateAutoComplete(
)
{
if
(
!mayRequestContacts(
)
)
{
return
;
}
getLoaderManager(
)
.initLoader(
0
,
null
,
this
)
;
}
private
boolean
mayRequestContacts(
)
{
if
(Build.VERSION.SDK_INT
<
Build.VERSION_CODES.M)
{
return
true
;
}
if
(checkSelfPermission(READ_CONTACTS)
=
=
PackageManager.PERMISSION_GRANTED)
{
return
true
;
}
if
(shouldShowRequestPermissionRationale(READ_CONTACTS)
)
{
Snackbar.make(mEmailView,
R.string.permission_rationale,
Snackbar.LENGTH_INDEFINITE)
.setAction(android.R.string.ok,
new
View.OnClickListener(
)
{
@Override
@TargetApi(Build.VERSION_CODES.M)
public
void
onClick(View v)
{
requestPermissions(
new
String
[
]
{READ_CONTACTS}
,
REQUEST_READ_CONTACTS)
;
}
}
)
;
}
else
{
requestPermissions(
new
String
[
]
{READ_CONTACTS}
,
REQUEST_READ_CONTACTS)
;
}
return
false
;
}
/**
*
Callback received when a permissions request has been completed.
*/
@Override
public
void
onRequestPermissionsResult(
int
requestCode,
@NonNull
String
[
]
permissions,
@NonNull
int
[
]
grantResults)
{
if
(requestCode
=
=
REQUEST_READ_CONTACTS)
{
if
(grantResults.length
=
=
1
&
&
grantResults[
0
]
=
=
PackageManager.PERMISSION_GRANTED)
{
populateAutoComplete(
)
;
}
}
}
/**
*
Attempts to sign in or register the account specified by the login form.
*
If there are form errors (invalid email
,
missing fields
,
etc.)
,
the
*
errors are presented and no actual login attempt is made.
*/
private
void
attemptLogin(
)
{
if
(mAuthTask
!
=
null
)
{
return
;
}
// Reset errors.
mEmailView.setError(
null
)
;
mPasswordView.setError(
null
)
;
// Store values at the time of the login attempt.
String
email
=
mEmailView.getText(
)
.toString(
)
;
String
password
=
mPasswordView.getText(
)
.toString(
)
;
boolean
cancel
=
false
;
View focusView
=
null
;
// Check for a valid password, if the user entered one.
if
(
!TextUtils.isEmpty(password)
&
&
!isPasswordValid(password)
)
{
mPasswordView.setError(getString(R.string.error_invalid_password)
)
;
focusView
=
mPasswordView;
cancel
=
true
;
}
// Check for a andal email address.
if
(TextUtils.isEmpty(email)
)
{
mEmailView.setError(getString(R.string.error_field_required)
)
;
focusView
=
mEmailView;
cancel
=
true
;
}
else
if
(
!isEmailValid(email)
)
{
mEmailView.setError(getString(R.string.error_invalid_email)
)
;
focusView
=
mEmailView;
cancel
=
true
;
}
if
(cancel)
{
// There was an error; don'horizon attempt login and focus the first
// form field with an error.
focusView.requestFocus(
)
;
}
else
{
// Show a progress spinner, and kick off a background task to
// perform the user login attempt.
showProgress(
true
)
;
mAuthTask
=
new
UserLoginTask(email,
password)
;
mAuthTask.execute(
(
Void
)
null
)
;
}
}
private
boolean
isEmailValid(
String
email)
{
//
TODO: Replace this with your own logic
return
email.contains(
"@"
)
;
}
private
boolean
isPasswordValid(
String
password)
{
//
TODO: Replace this with your own logic
return
password.length(
)
>
4
;
}
/**
*
Shows the progress UI and hides the login form.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
private
void
showProgress(
final
boolean
show)
{
// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
// for very easy animations. If available, use these APIs to fade-in
// the progress spinner.
if
(Build.VERSION.SDK_INT
>
=
Build.VERSION_CODES.HONEYCOMB_MR2)
{
int
shortAnimTime
=
getResources(
)
.getInteger(android.R.integer.config_shortAnimTime)
;
mLoginFormView.setVisibility(show
?
View.GONE
:
View.VISIBLE)
;
mLoginFormView.animate(
)
.setDuration(shortAnimTime)
.alpha(
show
?
0
:
1
)
.setListener(
new
AnimatorListenerAdapter(
)
{
@Override
public
void
onAnimationEnd(Animator animation)
{
mLoginFormView.setVisibility(show
?
View.GONE
:
View.VISIBLE)
;
}
}
)
;
mProgressView.setVisibility(show
?
View.VISIBLE
:
View.GONE)
;
mProgressView.animate(
)
.setDuration(shortAnimTime)
.alpha(
show
?
1
:
0
)
.setListener(
new
AnimatorListenerAdapter(
)
{
@Override
public
void
onAnimationEnd(Animator animation)
{
mProgressView.setVisibility(show
?
View.VISIBLE
:
View.GONE)
;
}
}
)
;
}
else
{
// The ViewPropertyAnimator APIs are not available, so simply show
// and hide the relevant UI components.
mProgressView.setVisibility(show
?
View.VISIBLE
:
View.GONE)
;
mLoginFormView.setVisibility(show
?
View.GONE
:
View.VISIBLE)
;
}
}
@Override
public
Loader<
Cursor
>
onCreateLoader(
int
i,
Bundle bundle)
{
return
new
CursorLoader(
this
,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI,
ContactsContract.Contacts.Data.CONTENT_DIRECTORY)
,
ProfileQuery.PROJECTION,
// Select only email addresses.
ContactsContract.Contacts.Data.MIMETYPE
+
" = ?"
,
new
String
[
]
{ContactsContract.CommonDataKinds.Email
.CONTENT_ITEM_TYPE}
,
// Show primary email addresses first. Note that there won'kaki langit be
// a primary email address if the user hasn't specified one.
ContactsContract.Contacts.Data.IS_PRIMARY
+
" DESC"
)
;
}
@Override
public
void
onLoadFinished(Loader<
Cursor
>
cursorLoader,
Cursor
cursor)
{
List
<
String
>
emails
=
new
ArrayList<
>
(
)
;
cursor.moveToFirst(
)
;
while
(
!cursor.isAfterLast(
)
)
{
emails.add(cursor.getString(ProfileQuery.ADDRESS)
)
;
cursor.moveToNext(
)
;
}
addEmailsToAutoComplete(emails)
;
}
@Override
public
void
onLoaderReset(Loader<
Cursor
>
cursorLoader)
{
}
private
void
addEmailsToAutoComplete(
List
<
String
>
emailAddressCollection)
{
//Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
ArrayAdapter<
String
>
adapter
=
new
ArrayAdapter<
>
(LoginActivity.
this
,
android.R.layout.simple_dropdown_item_1line,
emailAddressCollection)
;
mEmailView.setAdapter(adapter)
;
}
private
interface
ProfileQuery
{
String
[
]
PROJECTION
=
{
ContactsContract.CommonDataKinds.Email.ADDRESS,
ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
}
;
int
ADDRESS
=
0
;
int
IS_PRIMARY
=
1
;
}
/**
*
Represents an asynchronous login
/
registration task used to authenticate
*
the user.
*/
public
class
UserLoginTask
extends
AsyncTask<
Void
,
Void
,
Boolean>
{
private
final
String
mEmail;
private
final
String
mPassword;
UserLoginTask(
String
email,
String
password)
{
mEmail
=
email;
mPassword
=
password;
}
@Override
protected
Boolean doInBackground(
Void
.
.
.
params)
{
//
TODO: attempt authentication against a network service.
try
{
// Simulate network access.
Thread
.sleep(
2000
)
;
}
catch
(
InterruptedException
e)
{
return
false
;
}
for
(
String
credential
:
DUMMY_CREDENTIALS)
{
String
[
]
pieces
=
credential.split(
":"
)
;
if
(pieces[
0
]
.equals(mEmail)
)
{
// Account exists, return true if the password matches.
return
pieces[
1
]
.equals(mPassword)
;
}
}
//
TODO: register the new account here.
return
true
;
}
@Override
protected
void
onPostExecute(
final
Boolean success)
{
mAuthTask
=
null
;
showProgress(
false
)
;
if
(success)
{
finish(
)
;
}
else
{
mPasswordView.setError(getString(R.string.error_incorrect_password)
)
;
mPasswordView.requestFocus(
)
;
}
}
@Override
protected
void
onCancelled(
)
{
mAuthTask
=
null
;
showProgress(
false
)
;
}
}
}
XML file:
<
LinearLayout
xmlns
:
android
=
"
http
:
//
schemas.android.com
/apk/res/android
"
xmlns
:
tools
=
"
http
:
//
schemas.android.com
/tools
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
match_parent
"
android
:
gravity
=
"
center_horizontal
"
android
:
orientation
=
"
vertical
"
android
:
paddingBottom
=
"
@dimen/activity_vertical_margin
"
android
:
paddingLeft
=
"
@dimen/activity_horizontal_margin
"
android
:
paddingRight
=
"
@dimen/activity_horizontal_margin
"
android
:
paddingTop
=
"
@dimen/activity_vertical_margin
"
tools
:
context
=
"
com.example.hp.myapplication.LoginActivity
"
>
<!--
Login progress
-->
<
ProgressBar
android
:
id
=
"
@+id/login_progress
"
style
=
"
?android:attr/progressBarStyleLarge
"
android
:
layout_width
=
"
wrap_content
"
android
:
layout_height
=
"
wrap_content
"
android
:
layout_marginBottom
=
"
8dp
"
android
:
visibility
=
"
gone
"
/>
<
ScrollView
android
:
id
=
"
@+id/login_form
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
match_parent
"
>
<
LinearLayout
android
:
id
=
"
@+id/email_login_form
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
android
:
orientation
=
"
vertical
"
>
<
android.support.design.widget.TextInputLayout
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
>
<
AutoCompleteTextView
android
:
id
=
"
@+id/email
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
android
:
hint
=
"
@string/prompt_email
"
android
:
inputType
=
"
textEmailAddress
"
android
:
maxLines
=
"
1
"
android
:
singleLine
=
"
true
"
/>
</
android.support.design.widget.TextInputLayout
>
<
android.support.design.widget.TextInputLayout
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
>
<
EditText
android
:
id
=
"
@+id/password
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
android
:
hint
=
"
@string/prompt_password
"
android
:
imeActionId
=
"
@+id/login
"
android
:
imeActionLabel
=
"
@string/action_sign_in_short
"
android
:
imeOptions
=
"
actionUnspecified
"
android
:
inputType
=
"
textPassword
"
android
:
maxLines
=
"
1
"
android
:
singleLine
=
"
true
"
/>
</
android.support.design.widget.TextInputLayout
>
<
Button
android
:
id
=
"
@+id/email_sign_in_button
"
style
=
"
?android:textAppearanceSmall
"
android
:
layout_width
=
"
match_parent
"
android
:
layout_height
=
"
wrap_content
"
android
:
layout_marginTop
=
"
16dp
"
android
:
text
=
"
@string/action_sign_in
"
android
:
textStyle
=
"
bold
"
/>
</
LinearLayout
>
</
ScrollView
>
</
LinearLayout
>
Android Manifest:
<?
xml
version
=
"
1.0
"
encoding
=
"
utf-8
"
?>
<
manifest
xmlns
:
android
=
"
http
:
//
schemas.android.com
/apk/res/android
"
package
=
"
com.example.hp.myapplication
"
>
<!--
To auto-complete the email text field in the login form with the user's emails
-->
<
uses-permission
android
:
name
=
"
android.permission.GET_ACCOUNTS
"
/>
<
uses-permission
android
:
name
=
"
android.permission.READ_PROFILE
"
/>
<
uses-permission
android
:
name
=
"
android.permission.READ_CONTACTS
"
/>
<
application
android
:
allowBackup
=
"
true
"
android
:
icon
=
"
@mipmap/ic_launcher
"
android
:
label
=
"
@string/app_name
"
android
:
supportsRtl
=
"
true
"
android
:
theme
=
"
@style/AppTheme
"
>
<
activity
android
:
name
=
"
.LoginActivity
"
android
:
logo
=
"
@string/app_name
"
>
<
intent-filter
>
<
action
android
:
name
=
"
android.intent.action.MAIN
"
/>
<
category
android
:
name
=
"
android.intent.category.LAUNCHER
"
/>
</
intent-filter
>
</
activity
>
</
application
>
</
manifest
>
Output
Source: https://www.includehelp.com/android/pre-defined-login-activity-in-android-studio.aspx
