Travis CI: Android Build Errors

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This post records some errors I have met during set up an Android build pipeline with Travis CI.

Failed to install the following Android SDK packages as some licences have not been accepted.

Error message:

Failed to install the following Android SDK packages as some licences have not been accepted.
platforms;android-29 Android SDK Platform 29
To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.

Fix:

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before_install:
  - yes | sdkmanager "platforms;android-29"

Lint found errors in the project; aborting build.

Error message:

Execution failed for task ‘:app:lint’.

> Lint found errors in the project; aborting build.

Quick Fix:

Add following code into app/build.gradle to disable abort when lint error:

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lintOptions {
    abortOnError false
}

Suggested Fix:

Run ./gradlew lint to generate lint report and fix those errors. You can find it under /app/build/outputs/lint-results-debug.html. You also can run ./gradlew lintDebug or ./gradlew lintRelease to run lint for debug or release version specifically.