I followed this tutorial
<https://cloud.google.com/appengine/docs/java/endpoints/helloendpoints-android-studio>for
setting up my Google App Engine instance and I am also using Firebase. My
goal is to put all of the "computation" on Google App Engine. I want to
call a function like this one below:
MyEndpoint:
package productions.widowmaker110.backend;
/** An endpoint class we are exposing */
@Api(
name = "myApi",
version = "v1",
namespace = @ApiNamespace(
ownerDomain = "backend.widowmaker110.productions",
ownerName = "backend.widowmaker110.productions",
packagePath=""
)
)
public class MyEndpoint {
/** A simple endpoint method that takes a name and says Hi back */
@ApiMethod(name = "sayHi")
public MyBean sayHi(@Named("name") String name) {
// Write a message to the database
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("message");
// Read from the database
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
String value = dataSnapshot.getValue(String.class);
Log.d(TAG, "Value is: " + value);
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w(TAG, "Failed to read value.", error.toException());
}
});
MyBean response = new MyBean();
response.setData("Hi, " + name);
return response;
}
}
MainActivity:
package productions.widowmaker110.gpsweather;
// imports...
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new EndpointsAsyncTask().execute(new Pair<Context, String>(this,
"Manfred"));
}
class EndpointsAsyncTask extends AsyncTask<Pair<Context, String>, Void,
String> {
private MyApi myApiService = null;
private Context context;
@Override
protected String doInBackground(Pair<Context, String>... params) {
if(myApiService == null) { // Only do this once
MyApi.Builder builder = new
MyApi.Builder(AndroidHttp.newCompatibleTransport(),
new AndroidJsonFactory(), null)
// options for running against local devappserver
// - 10.0.2.2 is localhost's IP address in Android emulator
// - turn off compression when running against local devappserver
.setRootUrl("http://10.0.2.2:8080/_ah/api/";)
.setGoogleClientRequestInitializer(new GoogleClientRequestInitializer() {
@Override
public void initialize(AbstractGoogleClientRequest<?>
abstractGoogleClientRequest) throws IOException {
abstractGoogleClientRequest.setDisableGZipContent(true);
}
});
// end options for devappserver
myApiService = builder.build();
}
context = params[0].first;
String name = params[0].second;
try {
return myApiService.sayHi(name).execute().getData();
} catch (IOException e) {
return e.getMessage();
}
}
@Override
protected void onPostExecute(String result) {
Toast.makeText(context, result, Toast.LENGTH_LONG).show();
}
}
}
I understand the above code for Firebase is Android specific so running on a
Google App Engine instance doesn't work. I was wondering if any one knows how
to perform CRUD
operations on a firebase database from Google App Engine backend. Any help is
appreciated.
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