Support running on linux without hardware accleration.

src/emulator-manager.ts

@@ -17,6 +17,12 @@ export async function launchEmulator(apiLevel: number, target: string, arch: str
 
   // start emulator
   console.log('Starting emulator.');
+
+  // turn off hardware acceleration on Linux
+  if (process.platform === 'linux') {
+    emulatorOptions += ' -accel off';
+  }
+
   await exec.exec(`sh -c \\"${process.env.ANDROID_HOME}/emulator/emulator -avd test ${emulatorOptions} &"`, [], {
     listeners: {
       stderr: (data: Buffer) => {