Android – Development setup

How to debug a device over wifi?

• Connect device on same wifi network
• Connect device with USB
  

$ adb devices

• Restart TCP Mode

$ adb tcpip 5555

• Find IP address from mobile device
  Settings  ->  About phone/tablet -> Status -> IP address
• Connect device to Computer

$ adb connect 192.168.0.102

• Remove USB cable, DONE!
• Disconnect

$ adb disconnect 192.168.0.102

How to Transfer File from Android device to Mac?

• Disable “Debug” mode
• Search “Use USB for” > Select “File transfer/ Android Auto”

How to set sdk path?

• Create “local.properties” file

sdk.dir=/Users/your_name/Library/Android/sdk

How to generate debug signing certificate (ie for Firebase)?

• Go to https://developers.google.com/android/guides/client-auth
• Run
  keytool -list -v -alias androiddebugkey -keystore ${debug.keystore file path}

• Don’t input password, here is SHA1

How to get SHA-256 from keystore?

Option 1: Google Play Console

Option 2: Command line

keytool -list -v -keystore <keystore path> -alias <key alias> -storepass <store password> -keypass <key password>

How to launch an emulator in the tool window?

Android Studio > Preferences > Tools > Emulator and select/ deselect Launch in a tool window.

How to add a private SSL certificate to an Android project?

• Add pem file into src/main/res/raw/abc.pem
• Add src/main/res/xml/network_security_config.xml

<?xml version="1.0" encoding="utf-8">
<network-security-config>
    <domain-config>
        <domain includeSubdomains="true">xxxxxx.com</domain>
        <trust-anchors>
            <certificates src="@raw/abc.pem" />
        </trust-anchors>
    </domain-config>
</network-security-config>

• Add this prop into application tag in Manifest file

<application
  ...
  android:networkSecurityConfig="@xml/network_security_config"
  ...

How to set signing for Build variants?

• Select “Project Structure“

• Create a signing

• Set this signing to a build flavour

• How to build an variant by CLI?

$ gradlew tasks
$ ./gradlew task-name

How to access Android emulator package?

adb shell run-as your.app.package.name ls /data/data/your.app.package.name

adb -e shell
run-as your.app.package.name

How to use cli to control the emulator?

adb shell touch /sdcard/Download/xxxxx
adb reboot

How to clean up Gradle?

• Remove the Gradle User Home text field content

• Android Studio shows a “Reset” button
• Click “Reset”, then “OK”

Issues

How to set or change the default Java (JDK) version on macOS?

(When running ./gradlew publishToMavenLocal, it requires JDK 11+)

• Download a version of JDK you want and install it
  installation-jdk-macos

• Open ~/.zshrc and set JAVA_HOME with the version you have just installed

export JAVA_HOME=$(/usr/libexec/java_home -v 16.0.2)

source ~/.zshrc
echo $JAVA_HOME
java -version

Android Studio Error “Android Gradle plugin requires Java 11 to run. You are currently using Java 1.8”

• Check your JVM version

./gradlew --version

• Download your new JDK as above

How to know JVM versions installed in my machine?

/usr/libexec/java_home -V

React native Android build failed after updating JVM from 1.8.0 to 16.0.2, how to fix?

• Open ~/.zshrc and set JAVA_HOME with the version 1.8.0

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8.0)

Unable to load script. Make sure you are either running a Metro server or that your bundle ‘index.android.bundle’ is packaged correctly for release.

Run

adb reverse tcp:8081 tcp:8081

because

When the RN packager is running, there is an active web server accessible in your browser at 127.0.0.1:8081. It’s from this server that the JS bundle for your application is served and refreshed as you make changes. Without the reverse proxy, your phone wouldn’t be able to connect to that address.