Develop Reference

How to get a compile error if a JAR dependency is missing?

I have an Android project with the following dependencies:
-- Android App
---> MySDK.Jar
------> 'org.apache.commons:commons-lang3:3.5'
This is MySDK.jar that has a dependency on commons-lang3.
I'm working on Android Studio and I'm thus using Gradle.
Here is my problem:
I have shared "MySDK.Jar" to someone and he has built his own Android App on top of it.
It works but we have seen that the compiler doesn't notice the missing dependency on 'org.apache.commons:commons-lang3:3.5'. At run-time there will be a crash if the code using 'org.apache.commons:commons-lang3:3.5' is called. One may not notice the problem if he doesn't call the code using this library.
I know that we can solve this issue by adding the following line to Android App build.gradle file:
compile 'org.apache.commons:commons-lang3:3.5'
I'm wondering if there is a way to get a compile error indicating such missing dependencies? It is indeed better to see the dependency problem at compilation time rather than at runtime.
What are the recommended good practices for this?
Thanks!

commons-lang3 is a transitive dependency of Android App. As such, it is often not needed for compilation - there are exceptions, especially regarding multiple levels of inheritance. So at compile time you (usually) do not know whether you miss a transitive dependency that you need at runtime.
This is where Gradle comes in. Gradle can (as Maven) resolve dependencies transitively from a Maven repository (as MavenCentral). If you put MySDK into a Maven repository (like Nexus or Artifactory, which have open source versions), everyone using MySDK will automatically draw commons-lang3 so you will not miss anything at runtime.

If you are just adding the jar file in your project you can't warning about the missing dependencies.
To do it you have to publish the jar file in a maven repo.
In this way you have a pom file which describes the dependencies that gradle has to download.

Provide a method like MySDK.init() int your MySDK.jar,call a method whe is belong to org.apache.commons:commons-lang3:3.5' in the MySDK.init() method, then put init() into onCreate() of your Application,
Another way is，putorg.apache.commons:commons-lang3:3.5 into MySDK.jar，
Hope it helps you :)

How to make project addable to other projects gradle

I don't know if Im understanding it right, but how do i make a project become addable on android gradle's dependency, more like facebook's sdk where we add compile 'com.facebook.....'. I'm new to this topic so please guide me. Thanks.

If you want to add another gradle project in your current one. (assuming it is inside the current projects root directory)
in settings.gradle file add
include ':name-of-the-dir-of-the-project-you-want-to-include'
in build.gradle
dependencies {
compile project(':name-of-the-project-you-want-to-include')
}

Including android.support.v7.app dependency in Android Studio

I'm migrating from Eclipse over to Android Studio and am looking at the Navigation Drawer example from Google. Right away, I see that I get this warning;
It looks like I need to use the v7 library rather than the v4. I can't figure out how to do this. In Eclipse, I just added a dependency from the build tools, but I see no such option in Android Studio. If I look at the build.gradle file, I can see this:
dependencies {
compile 'com.android.support:support-v4:21.0.3'
}
I just downloaded Android Studio yesterday, so I think that I should have this dependency somewhere, but I just don't know how to include it. Can someone tell me how to do this?

From within Android Studio, you can go to File, Project Structure, select your module, and go to the Dependencies tab - you'll see a list of dependencies - you can add new dependencies via the + sign near the bottom of that screen - it will automatically suggest the most popular libraries and all Google libraries including the one you want: appcompat-v7. This controls the build.gradle file and, in your case, adds the line:
compile 'com.android.support:appcompat-v7:21.0.3'
Note that you can also use sites such as Gradle, please to manually figure out what the dependency should be and add it to your build.gradle file yourself if you'd like.

How to insert github source code to my project

I'm new at GitHub. I found a library that I want to use in my Android project (Glide), but I don't know how.
After downloading the source code I'm stuck with a zip folder that I don't know how to import it into my project. I'm working with Android Studio.
Any help?
Thanks.

Unzip the downloaded project. Open YOUR project in Android studio. Click File -> Import module. Add this module as a dependency to your project. You should be good to go.
[EDIT]
BUT, since Glide has gradle/maven support, I can just simply modify your project's build.gradle file and add the following lines to the dependencies group:
compile 'com.github.bumptech.glide:glide:3.3.+'
compile 'com.android.support:support-v4:19.0.0' // You might need to increase the version numbers if the libraries have never versions

Imported module in Android Studio can't find imported class

I recently downloaded the ViewPagerIndicator library and imported it into android studio. After adding it to my project I get a rendering error "The following classes could not be found:" and points to com.viewpagerindicator.IconPageIndicator.
The steps I took were Files->Import Module->'library name', Project Structure -> Dependencies -> + the imported module. Then to my layout xml file I added the <com.viewpagerindicator.IconPageIndicator />, after that I got the missing class problem.
It compiles just fine and I went through all of the build.gradle and settings.gradle files and compared them to what they should be online.
MyApp->build.gradle has compile project(':library') under dependencies
settings.gradle has include ':library' with no build errors.

First of all, you must import your library project by following that path:
File --> New --> Import Module
After you have imported the library project successfully, you must check your build.gradle file inside your project's folder if the following line is present at the "dependencies" section:
implementation project(':NameOfTheLibProject')
Then your project must be built successfully.

I found that my issue was the Android Plugin Version under Project Structure --> Project was different to the version my plugins all used. Once I aligned them to the same version, I could see all my classes from my imported module.
Took me hours :(

I had the same problem. I just did: Invalidate / Restart ..

I too had trouble importing module as it was not appearing in list of modules. And way it worked for me is manually entering it in settings.gradle this way:
include ':app', 'module_name'
And in build.gradle
compile project(':module_name')

In my case, I did add in app gradle:
// Nearly deprecated.
compile project(':NameOfTheLibProject')
// Or
implementation project(':NameOfTheLibProject')
but it only works when I change
compileSdkVersion
minSdkVersion
targetSdkVersion
in app and the other modules are the same.

The following solution worked for me,just two steps.
Go to your project structure on android studio, select project from left side.Change Android plugin version to Gradle version press ok.
If error occurs after synchronization again go to project structure and select project.undo the android plugin version like before.Gradle will align the library and make the class visible to XML files.

The issue in my case was different compile and target SDK version,
mentioned in my main app module and your added lib module.
Once I matched both of them it worked perfectly.
So just open build.gradle file of app-level and lib module-level check for the SDK version.

settings.gradle
dependencies {
implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation project(':wheel') // "Wheel" - you're project path name
}

In case you just changed the name of your project in the pubspec.yaml File, make sure to change the import names as well, because they will stay the same and therefore wont find the new named directory.
Ex. change this to :
import 'package:previousName/backend/connector/userConnector.dart';
to this:
import 'package:newName/backend/connector/userConnector.dart';
As far as i know, there is no terminal command for that, only find-in-files-replace :(