Develop Reference

Android studio preview does not show layouts

I have just started to learn android studio. I've encountered a problem:
The layouts won't appear in the preview after I have added them. But if I change the theme or run the app in the emulator they do appear but they overlap.

For API 27:
Add the following dependency:
If you are using targetSdkVersion 27,
in your App Level gradle file build.gradle(Module: app)
implementation 'com.android.support:appcompat-v7:27.1.1'
For API 28:
if you are using targetSdkVersion 28,
Step 1:
Make sure you have the following dependency:
implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
UPDATE: For the latest appcompat-v7 library repo version, follow this link
https://mvnrepository.com/artifact/com.android.support/appcompat-v7?repo=google
Step 2:
Goto Values > styles.xml and modify the style as follows,
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
or any other base theme you like.
Here is an example constraint layout for you,
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<EditText
android:id="#+id/enter_age"
android:layout_width="200dp"
android:layout_height="100dp"
android:ems="10"
android:hint="enter age"
android:inputType="number"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="#+id/button1"
app:layout_constraintVertical_chainStyle="packed" />
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="110dp"
android:onClick="butGetAge"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/enter_age"
app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>

EditText Drawable Right not working when upgrading design support library

I have upgraded support library from 'com.android.support:design:23.0.0' to 'com.android.support:design:25.0.0'. Now drawableright(Image) not working for EditText. Here is my code.
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:drawableRight="#drawable/ic_calendar"/>
</android.support.design.widget.TextInputLayout>

Add drawableEnd to your edittext this way
<EditText
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:drawableRight="#drawable/ic_calendar"
android:drawableEnd="#drawable/ic_calendar"/>

update your support library
compile 'com.android.support:design:25.3.1'

android : TextInputLayout hides drawableRight of child EditText

I am always updated with library updates, and this is what it resulted into.
In build.gradle(Project:xxx):
classpath 'com.android.tools.build:gradle:2.2.0-beta1'
In build.gradle(Module:app)
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:design:24.2.0'
And put password field as below:
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword" />
</android.support.design.widget.TextInputLayout>
Taadaa...My Password field looks now as below:
You can also go simply with EditText.
But, there are some glitches in this update.
Problem:
If I put any drawableRight in EditText, it displays nothing. TextInputLayout also has property to disable toggle functionality. I did it that too as below, but no success:
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:passwordToggleEnabled="false">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableRight="#drawable/ic_alarm_on_black_24dp"
android:inputType="textPassword" />
</android.support.design.widget.TextInputLayout>
Can anyone help me please.

I reported the issue at https://code.google.com/p/android/issues/detail?id=221002.
It was a bug in the library version 24.2.0 but it has been fixed in version 24.2.1. Simply update as below:
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'

You need to upgrade the support library to 24.2.1 (see https://code.google.com/p/android/issues/detail?id=221002).

RuntimeException while inflating InputTextLayout

When i create new sample project with TextInputLayout , Its working good.
But in my exist project if i have added TextInputlayout , its throws runtime exception caused by java.lang.UnsupportedOperationException.
Why its happen? How to resolve this?
compile 'com.android.support:design:22.2.0'
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TextInputLayout
android:id="#+id/til"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/textDialog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="First Name"/>
</android.support.design.widget.TextInputLayout>
</LinearLayout>
Why it happen? how to solve this?

Compare the gradle files of your sample project to your real project. Your project might not be setup correctly to use Material Design resources.

Android EditText view Floating Hint in Material Design

Does API 21 provide a method to use the following feature:
http://www.google.com/design/spec/components/text-fields.html#text-fields-floating-labels
I'm trying to float the EditText hints.
Thanks!

Floating hint EditText:
Add below dependency in gradle:
compile 'com.android.support:design:22.2.0'
In layout:
<android.support.design.widget.TextInputLayout
android:id="#+id/text_input_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="UserName"/>
</android.support.design.widget.TextInputLayout>

Yes, as of May 29, 2015 this functionality is now provided in the Android Design Support Library
This library includes support for
Floating labels
Floating action button
Snackbar
Navigation drawer
and more

The Android support library can be imported within gradle in the dependencies :
compile 'com.android.support:design:22.2.0'
It should be included within GradlePlease! And as an example to use it:
<android.support.design.widget.TextInputLayout
android:id="#+id/to_text_input_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<AutoCompleteTextView
android:id="#+id/autoCompleteTextViewTo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="To"
android:layout_marginTop="45dp"
/>
</android.support.design.widget.TextInputLayout>
Btw, the editor may not understand that AutoCompleteTextView is allowed within TextInputLayout.

Android hasn't provided a native method. Nor the AppCompat.
Try this library: https://github.com/rengwuxian/MaterialEditText
This might be what you want.

Import the Support Libraries, In your project's build.gradle file, add the following lines in the project's dependencies:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:design:22.2.0'
compile 'com.android.support:appcompat-v7:22.2.0'
}
Use following TextInputLayout in your UI Layout:
<android.support.design.widget.TextInputLayout
android:id="#+id/usernameWrapper"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="#+id/username"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:hint="Username"/>
</android.support.design.widget.TextInputLayout>
Than, call setHint on TextInputLayout just after setContentView call because, to animate the floating label, you just need to set a hint, using the setHint method.
final TextInputLayout usernameWrapper = (TextInputLayout) findViewById(R.id.usernameWrapper);
usernameWrapper.setHint("Username");

You need to add the following to your module build.gradle file:
implementation 'com.google.android.material:material:1.0.0'
And use com.google.android.material.textfield.TextInputLayout in your XML:
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/text_input_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="#string/my_hint">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="UserName"/>
</com.google.android.material.textfield.TextInputLayout>

#andruboy's suggestion of https://gist.github.com/chrisbanes/11247418 is probably your best bet.
https://github.com/thebnich/FloatingHintEditText kind of works with appcompat-v7 v21.0.0, but since v21.0.0 does not support accent colors with subclasses of EditText, the underline of the FloatingHintEditText will be the default solid black or white. Also the padding is not optimized for the Material style EditText, so you may need to adjust it.

No it doesn't. I would expect this in a future api release, but for now we are stuck with EditText. Another option is this library:
https://github.com/marvinlabs/android-floatinglabel-widgets

For an easier way to use the InputTextLayout, I have created this library that cuts your XML code to less than the half, and also provides you with the ability to set an error message as well as a hint message and an easy way to do your validations.
https://github.com/TeleClinic/SmartEditText
Simply add
compile 'com.github.TeleClinic:SmartEditText:0.1.0'
Then you can do something like this:
<com.teleclinic.kabdo.smartmaterialedittext.CustomViews.SmartEditText
android:id="#+id/emailSmartEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:setLabel="Email"
app:setMandatoryErrorMsg="Mandatory field"
app:setRegexErrorMsg="Wrong email format"
app:setRegexType="EMAIL_VALIDATION" />
<com.teleclinic.kabdo.smartmaterialedittext.CustomViews.SmartEditText
android:id="#+id/passwordSmartEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:setLabel="Password"
app:setMandatoryErrorMsg="Mandatory field"
app:setPasswordField="true"
app:setRegexErrorMsg="Weak password"
app:setRegexType="MEDIUM_PASSWORD_VALIDATION" />
<com.teleclinic.kabdo.smartmaterialedittext.CustomViews.SmartEditText
android:id="#+id/ageSmartEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:setLabel="Age"
app:setMandatory="false"
app:setRegexErrorMsg="Is that really your age :D?"
app:setRegexString=".*\\d.*" />

Use the TextInputLayout provided by the Material Components Library:
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Label">
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="match_parent" />
</com.google.android.material.textfield.TextInputLayout>