Develop Reference

Issue with Android Studio 3.0.1

Hey people,
I'm having this problem about a few hours. I already tried with Invalider cache/Restart but didn't work also I downloaded the last versions of the SDK Tools. Anyone knows how to solve it?
This is my gradle
Also, I'm having this issue too
Thanks in advance.

In your app level build.gradle file, specify:
dependencies {
compile 'com.android.support:recyclerview-v7:26.0.3'
compile 'com.android.support:design:26.0.3'
...
}

The render in Layout is 26 while in the gradle the targetSdkVersion is 25

Please add constraint-layout dependency also.
compile 'com.android.support.constraint:constraint-layout:1.1.0-beta3'
and try adding AppCompact support in dependency.
implementation 'com.android.support:appcompat-v7:27.0.0'
** Please change version names according to your build.

Failed to resolve: com.android.support:appcompat-v7:15.+

i find 2 solutions for this problem, but both didn't work. So i decided to ask you.
I'm using Debian 8 Jessie and Android Studio 1.4
I just created new project and when i tried to start it i got an error:
" Failed to resolve: com.android.support:appcompat-v7:15.+ "
And gives me 3 option.
1) Install Repository and sync project
When i tried it i got an error like this:
Loading SDK information...
Ignoring unknown package filter 'extra-android-m2repository'Warning: The package filter removed all packages. There is nothing to install.
Please consider trying to update again without a package filter.
And down of the window:
Install failed. Please check your network connection and try again. You may continue with creating your project, but it will not complete correctly without the missing components.
2) Show in File
It's my build.gradle dependencies:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:15.+'
}
Error in this line:
compile 'com.android.support:appcompat-v7:15.+'
3) Show in Project Structure dialog
Dependencies windows is opened and about this line again:
compile 'com.android.support:appcompat-v7:15.+'
Tried Solutions:
Firstly, i tried to download version sdk again. I deleted Android 4.0.3 and re-download again but still same error.
After that i tried to download support library which recommended in; topic 1 , topic 2. After i download Android Support Library, rev 23.0.1 still got same error.
After that i tried to solve my problem with fixing first option in error (install repository and sync project. And i found some topics again. I checked my HTTP Proxy section in Setting, already "No proxy" is selected.
So, i tried everything i found, but still i got this error. Someone can help me please?

After you downloaded the latest support library with your sdk manager, you can set that version in your gradle file.
If you downloaded 23.0.1 set it like this:
compile 'com.android.support:appcompat-v7:23.0.1'
EDIT:
Also note following hint, given by Android Studio, when using + in Version number:
Avoid using + in version numbers; can lead to unpredictable and unrepeatable builds (com.android.support:appcompat-v7:23.1.+)
Using + in dependencies lets you automatically pick up the latest
available version rather than a specific, named version. However, this
is not recommended; your builds are not repeatable; you may have
tested with a slightly different version than what the build server
used. (Using a dynamic version as the major version number is more
problematic than using it in the minor version position.)

Edit build.gradle
Replace 'com.android.support:appcompat-v7:15.+' with 'com.android.support:appcompat-v7:18.0.0'
Sync It
May be this will help you. If in case this will not work i.e. show error then see for installation of app-compat in "%homepath%\AppData\Local\Android\sdk\extras\android\m2repository\com\android\support\appcompat-v7"
Search for the oldest version and put the version number at xx: 'com.android.support:appcompat-v7:xx'

I installed Java and Android Studio today.
When creating my first project with API level 15 as minSDK, I faced the same problem.
As far as I can tell, it seems the installation of the sdk works not pretty well. For me, API level 15 had only the SDK platform. API level 23 had platform and sources. I don't remember, which tools where installed.
To solve the problem, I started the sdk manager (old version), removed api level 15 completely and installed api level 23 as suggested. After that, a newly created project (again with minSDK 15) was properly created.
The difference in the app/build.gradle file is obvious.
Maybe this helps other people facing the same issues, or one of the gurus can further explain, what happened.
Kind Regards

Got same errors.
Mac OSX
V. 10.9.5
Android studio 1.4.1
App:
Before:
android {
compileSdkVersion 15
buildToolsVersion "19.1.0"
After:
android {
compileSdkVersion 23
buildToolsVersion "19.1.0"
Before:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:15.+'
}
After:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.o'
}
Above changes + Build >> Clean Project.
Hope that helps!

Go to Built tab select "Edit Built types" select properties tab and check built tool version it was 19.1.1 for me.
Then go to built.gradle change compile to 'com.android.support:appcompat-v7:19+' . I changed to 19+ because my built version is 19.1.1 ; You have to select according to your built version(18+,19+,20+ like that).

Try following solution:
In Android studio:
Go to File -> Project structure
Check the selected Build Tools Version.
update your build.gradle for app with selected build tools version.
for e.g. 19.1.0
After update, Run Clean.
Please refer below screenshot.[Project Structure-> Build Tools Types][1]

I had a similar error message when creating a project.
fail to resolve com.android.support:appcompat-v7:14.+
I notice that if I create a new project with support for 4.0.3 instead of 4.0, no error occurs. I am using android studio 1.5. Hope this helps.

in my case, support and wearable versions were different, after making them exactly same, gradle build completed successfully.
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.android.support:wearable:1.0.0'
compile 'com.google.android.gms:play-services-wearable:11.0.4'
provided 'com.google.android.wearable:wearable:1.0.0'
}

The following classes could not be found: - android.support.design.widget.TextInputLayout

This is Tutorial which i am following.
Please help me out from this error. Rebuild is not solving the problem.

Does your build.gradle file contain the line below?
compile 'com.android.support:design:22.2.0'

You must include support libraries (like the ones below), yet this is sometimes not sufficient.
compile ("com.android.support:support-v4:23.3.0")
compile ("com.android.support:appcompat-v7:23.3.0")
compile ("com.android.support:support-annotations:23.3.0")
compile ("com.android.support:recyclerview-v7:23.3.0")
compile ("com.android.support:design:23.3.0")
Examine your layout in design view, and click on Show Exception
This answer will help if you have the following problem:
You need to use a Theme.AppCompat theme (or descendant) with the design library.
In your Manifest file, include in your application declaration
android:theme="#style/Theme.AppCompat"
Rebuild and your problem should be solved.

First things first :
If you are using the lastest sdk28 TextInputLayout is having some bug. At least mine did (date: 22 Sept 2018 ) NOT work.
To make it work the best way is to use slightly lower SDK for you target and compile SDK version. (I used sdk 27 and everything worked out fine then.)
To use TextInputLayout and then its features such as "floatinghinttext" you need to update your build.gradle(module.app) found in gradleScripts.
in dependencies add-
implementation 'com.android.support:design:25.0.0'
(if you get some error it must be of some latest version available, so use that instead of 25.0.0)
Note: The "compile" keyword is getting replaced by "implementation" for newer/all versions.
I am fairly new to android development, suggestions are welcomed. Please excuse if any mistakes committed.

How can I download an old version of the Android support library?

I'm targeting Android 19 (because that's what my phone is running). I want to add a notification with buttons; it seems the right approach is to use appcompat-v7.app.NotificationCompat.
However, when I add appcompat-v7 from the Android Support repository revision 22.2 (via a build.gradle dependency), it includes a file app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/22.2.0/res/values-v21/values-v21.xml that doesn't compile because it assumes the target is 21+.
I tried deleting that file, but it gets regenerated.
There doesn't seem to be a way to exclude a file from the build.
So, I need to get an older version of the support library or repository, that doesn't include 21 stuff.
I guess I could import all the sources directly (and leave out the v21 stuff), rather than thru the dependency? I'm not clear where to start with that.
I can use the SDK manager to get older versions of the SDK, but it only offers the latest version of the support library.

to directly answer your question it's all that one line on gradle:
compile 'com.android.support:appcompat-v7:22.2.0'
That last part is the version you're getting. 22.2.0 on the example above.
and on this link you can check the revisions numbers:
https://developer.android.com/tools/support-library/index.html#revisions
But you have a fundamentally wrong approach to your issue. You don't have to target the API for the device you have with you. You can easily and safely target the latest API, use the latest AppCompat features and bug fixes.
Lint will give you a warning every time you try to use a feature that is not from your minimumApi, regardless of the targetAPI

In your gradle build file change the dependency to be the 19 version (the version of the library should match the sdk you are compiling with):
dependencies {
compile 'com.android.support:appcompat-v7:19.1.+'
...
}
Edit: If v19 of the support lib doesn't have NotificationCompat, then you can't use that unless you compile against a later SDK. You can't include a support library with a higher version than your compiled SDK - that's the issue you are running into.
In this case change:
android {
compileSdkVersion 22
...
}
and leave the dependency set to the 22 version of the appcompat support lib

Error after adding AppCompat v7 in Android Studio

After adding the appCompat v7 library I get the error that R cannot be resolved, which is apparently due to the fact that R now exists twice. I found an answer to that problem here : Build errors after adding fullscreen activity in Android Studio
However, I dont have or cant find the file attrs.xml in \src\main\res\values\attrs.xml. Is there any other solution to that problem or can someone give me a detailed description of how to do that in Android Studio?
Thank you very much!!!

Put this in your /app/build.gradle file :
dependencies {
compile 'com.android.support:support-v4:18.0.0'
compile 'com.android.support:appcompat-v7:18.0.0'
}
and make sure the version code (here 18.0.0) is not higher than the buildToolsVersion in the same file :
android {
compileSdkVersion 16
buildToolsVersion "18.0.0"
}
then rebuild your project. Hope that helps!
Oh and make sure you have the right buildTools installed via SDK Manager! Actual version is 21.0.2 I think.

I'm may be noob, but after several search i was able to add appcompat.v7 in android studio.
Initially i was comfortable with Eclipse after Dex Error 65535, my whole hard work was doomed i thought.
As Honey suggested you have to add both support.v4 or v13 and appcompat.v7 in build.gradle.
That's it. This simple solution not even covered in google docs ;). A simple reminder appcompat depends on v4 or v13.