Integrate With Existing Android project will crash!

[xinzhuangbao]

after learned the doc https://facebook.github.io/react-native/docs/integration-with-existing-apps.html , I new a MyReactActivity as follows

I did all steps mentioned in that doc , and confirmed that the configuration is corrent . but when i run the app , it will crash , (the react-native version is 0.30.0 , run in the android emulator,and the package server had been started and was live ) ,here is the logs

08-03 09:32:45.215 1216-2098/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
08-03 09:32:45.697 2699-2699/com.awesomeproject E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.awesomeproject, PID: 2699
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: Could not connect to development server.
Try the following to fix the issue:
Ensure that the packager server is running
Ensure that your device/emulator is connected to your machine and has USB debugging enabled - run 'adb devices' to see a list of connected devices
If you're on a physical device connected to the same machine, run 'adb reverse tcp:8081 tcp:8081' to forward requests from your device
If your device is on the same Wi-Fi network, set 'Debug server host & port for device' in 'Dev settings' to y
at com.facebook.react.ReactInstanceManagerImpl.createReactContext(ReactInstanceManagerImpl.java:912)
at com.facebook.react.ReactInstanceManagerImpl.access$700(ReactInstanceManagerImpl.java:99)
at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:196)
at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:179)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)

and sometimes the package server will stoped when build android project , e.g.

who can help me ! I had try all the method what I can think of , I just want integrate the react-native to my existing android project . sorry for my poor english !

[humlk]

连不上开发服务器吧！
仔细看你的报错信息，log中有说明: "If you're on a physical device connected to the same machine, run ' adb reverse tcp:8081 tcp:8081 ' to forward requests from your device"。
cmd下运行一次“adb reverse tcp:8081 tcp:8081”。

[xinzhuangbao]

after add this code
"".setUseOldBridge(true).setUseDeveloperSupport(true)"" , it run success! thank you !