Android Studio

Tips and Tricks

• Search for intellij for help if not found
• Import Sample if struggling
• Right Click generate getters and setters (Goto coding styles to set m_, s for statics)
• Use blue arrow to run to cursor when debugging
• Lighting bolt applies changes to reduce restart
• LHS in debug is a structure tab to should locals
• Wrap logcat using soft wrap
• Right-click build and select project structure to change build

Issue with SdkManager

Problem

sdkmanager
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
	at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
	at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
	at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
	at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
	at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 5 more

Resolution

Make sure you have Java 11 (probably the cause)

sudo update-alternatives --config java
// Select /usr/lib/jvm/java-11-openjdk-amd64/bin/java

Fix it by

cd ~/Android/Sdk/tools
mkdir jaxb_lib
wget https://repo1.maven.org/maven2/javax/activation/activation/1.1.1/activation-1.1.1.jar -O jaxb_lib/activation.jar
wget https://repo1.maven.org/maven2/com/sun/xml/bind/jaxb-impl/2.3.3/jaxb-impl-2.3.3.jar -O jaxb_lib/jaxb-impl.jar
wget https://repo1.maven.org/maven2/com/sun/istack/istack-commons-runtime/3.0.11/istack-commons-runtime-3.0.11.jar -O jaxb_lib/istack-commons-runtime.jar
wget https://repo1.maven.org/maven2/org/glassfish/jaxb/jaxb-xjc/2.3.3/jaxb-xjc-2.3.3.jar -O jaxb_lib/jaxb-xjc.jar
wget https://repo1.maven.org/maven2/org/glassfish/jaxb/jaxb-core/2.3.0.1/jaxb-core-2.3.0.1.jar -O jaxb_lib/jaxb-core.jar
wget https://repo1.maven.org/maven2/org/glassfish/jaxb/jaxb-jxc/2.3.3/jaxb-jxc-2.3.3.jar -O jaxb_lib/jaxb-jxc.jar
wget https://repo1.maven.org/maven2/javax/xml/bind/jaxb-api/2.3.1/jaxb-api-2.3.1.jar -O jaxb_lib/jaxb-api.jar
# Append jaxb_lib to the CLASSPATH in sdkmanager and avdmanager
sed -ie 's%^CLASSPATH=.*%\0:$APP_HOME/jaxb_lib/*%' bin/sdkmanager bin/avdmanager

Set up .bashrc

export ANDROID_HOME=$HOME/Android/Sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

Debugging

We can stop on exception by going to run->view breakpoints. Tick Any Exception and When any is thrown. But the important box is Disable until hitting the following breakpoints. This is because most apps throw many exceptions in normal use. Find where is last worked, add a breakpoint and use the dropbox.