Force use Java 8 for sdkmanager and avdmanager.

src/java-version-manager.ts

@@ -0,0 +1,39 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+
+/**
+ * Returns the current $JAVA_HOME path.
+ */
+export async function getCurrentJavaHome(): Promise<string> {
+  let defaultJavaHome = '';
+  await exec.exec(`sh -c \\"echo $JAVA_HOME"`, [], {
+    listeners: {
+      stdout: (data: Buffer) => {
+        defaultJavaHome += data.toString();
+      }
+    }
+  });
+  return defaultJavaHome.trim();
+}
+
+/**
+ * Returns the Java 8 $JAVA_HOME path.
+ */
+export async function getJavaHomeV8(): Promise<string> {
+  let javaHomeV8 = '';
+  await exec.exec(`/usr/libexec/java_home -v 1.8`, [], {
+    listeners: {
+      stdout: (data: Buffer) => {
+        javaHomeV8 += data.toString();
+      }
+    }
+  });
+  return javaHomeV8.trim();
+}
+
+/**
+ * Sets $JAVA_HOME to the specified path.
+ */
+export function setJavaHome(path: string) {
+  core.exportVariable('JAVA_HOME', path);
+}

src/main.ts

@@ -4,6 +4,7 @@ import { checkApiLevel, checkTarget, checkArch, checkDisableAnimations, checkEmu
 import { launchEmulator, killEmulator } from './emulator-manager';
 import * as exec from '@actions/exec';
 import { parseScript } from './script-parser';
+import { getCurrentJavaHome, getJavaHomeV8, setJavaHome } from './java-version-manager';
 
 async function run() {
   try {
@@ -58,6 +59,10 @@ async function run() {
       console.log(`${script}`);
     });
 
+    // use Java 8 for sdkmanager and avdmanager
+    const defaultJavaHome = await getCurrentJavaHome();
+    setJavaHome(await getJavaHomeV8());
+
     // install SDK
     await installAndroidSdk(apiLevel, target, arch, emulatorBuild);
 
@@ -68,6 +73,9 @@ async function run() {
       core.setFailed(error.message);
     }
 
+    // use default JAVA_HOME for running custom script
+    setJavaHome(defaultJavaHome);
+
     // execute the custom script
     try {
       for (const script of scripts) {