A small issue about Multiple dex files define Landroid/support/v4/os/ResultReceiver

What Is The Problem?

I was upgrading the current android project to AndroidX then I encounter the following compile error:

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Multiple dex files define Landroid/support/v4/os/ResultReceiver;

By doing some research I found that this problem is caused by having duplicate import of the library. For example, you have library A, B. You import A and B in the project. However, B import A as well.

How To Fix?

First, you will need to find you what is the conflict of the library here. Usually this is because you import the android support library in the gradle and some third party library also import the android support library.

Find Dependencies List

This StackOverflow post helps me a lot. So you can cd into the project root directory and run the following command:

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./gradlew -q dependencies

If you see java issue returned, that probably because you didn’t install java on your computer. I installed Java SE Development Kit 8

If you see No configurations, use the following command instead:

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./gradlew -q :app:dependencies

Try to find the issue. Here is a brief screenshot of my configuration:

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+--- com.romandanylyk:pageindicatorview:0.2.0
|    +--- com.android.support:support-annotations:25.3.0
|    +--- com.android.support:support-compat:25.3.0
|    |    \--- com.android.support:support-annotations:25.3.0
|    \--- com.android.support:support-core-ui:25.3.0
|         +--- com.android.support:support-annotations:25.3.0
|         \--- com.android.support:support-compat:25.3.0 (*)
+--- com.loopj.android:android-async-http:1.4.9
|    \--- cz.msebera.android:httpclient:4.3.6
+--- com.nulab-inc:zxcvbn:1.2.5

Because I also import implementation "androidx.appcompat:appcompat:1.0.2", it is causing the issue of duplicate support-compat module.

Exclude Duplicates

Since I have already found the duplicates, the next step is easy. You can just exclude the duplicates like I did below:

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implementation ('com.romandanylyk:pageindicatorview:0.2.0') {
    exclude module: 'support-compat'
}

Note that you can find the module name after the :. For example, for library: com.android.support:support-compat:25.3.0, its group name is com.android.support, its module name is support-compact.