package com.google.samplesolutions.mobileassistant;
import java.io.IOException;
import com.google.samplesolutions.mobileassistant.messageEndpoint.MessageEndpoint;
import com.google.samplesolutions.mobileassistant.messageEndpoint.model.CollectionResponseMessageData;
import com.google.samplesolutions.mobileassistant.messageEndpoint.model.MessageData;
import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.json.jackson.JacksonFactory;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.TextView;
/**
* An activity that communicates with your App Engine backend via Cloud
* Endpoints.
*
* When the user hits the "Register" button, a message is sent to the backend
* (over endpoints) indicating that the device would like to receive broadcast
* messages from it. Clicking "Register" also has the effect of registering this
* device for Google Cloud Messaging (GCM). Whenever the backend wants to
* broadcast a message, it does it via GCM, so that the device does not need to
* keep polling the backend for messages.
*
* If you've generated an App Engine backend for an existing Android project,
* this activity will not be hooked in to your main activity as yet. You can
* easily do so by adding the following lines to your main activity:
*
* Intent intent = new Intent(this, RegisterActivity.class);
* startActivity(intent);
*
* To make the sample run, you need to set your PROJECT_NUMBER in
* GCMIntentService.java. If you're going to be running a local version of the
* App Engine backend (using the DevAppServer), you'll need to toggle the
* LOCAL_ANDROID_RUN flag in CloudEndpointUtils.java. See the javadoc in these
* classes for more details.
*
* For a comprehensive walkthrough, check out the documentation at
* http://developers.google.com/eclipse/docs/cloud_endpoints
*/
public class RegisterActivity extends Activity {
enum State {
REGISTERED, REGISTERING, UNREGISTERED, UNREGISTERING
}
private State curState = State.UNREGISTERED;
private OnTouchListener registerListener = null;
private OnTouchListener unregisterListener = null;
private MessageEndpoint messageEndpoint = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
Button regButton = (Button) findViewById(R.id.regButton);
registerListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
if (GCMIntentService.PROJECT_NUMBER == null
|| GCMIntentService.PROJECT_NUMBER.length() == 0) {
showDialog("Unable to register for Google Cloud Messaging. "
+ "Your application's PROJECT_NUMBER field is unset! You can change "
+ "it in GCMIntentService.java");
} else {
updateState(State.REGISTERING);
try {
GCMIntentService.register(getApplicationContext());
} catch (Exception e) {
Log.e(RegisterActivity.class.getName(),
"Exception received when attempting to register for Google Cloud "
+ "Messaging. Perhaps you need to set your virtual device's "
+ " target to Google APIs? "
+ "See https://developers.google.com/eclipse/docs/cloud_endpoints_android"
+ " for more information.", e);
showDialog("There was a problem when attempting to register for "
+ "Google Cloud Messaging. If you're running in the emulator, "
+ "is the target of your virtual device set to 'Google APIs?' "
+ "See the Android log for more details.");
updateState(State.UNREGISTERED);
}
}
return true;
case MotionEvent.ACTION_UP:
return true;
default:
return false;
}
}
};
unregisterListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
updateState(State.UNREGISTERING);
GCMIntentService.unregister(getApplicationContext());
return true;
case MotionEvent.ACTION_UP:
return true;
default:
return false;
}
}
};
regButton.setOnTouchListener(registerListener);
/*
* build the messaging endpoint so we can access old messages via an endpoint call
*/
MessageEndpoint.Builder endpointBuilder = new MessageEndpoint.Builder(
AndroidHttp.newCompatibleTransport(),
new JacksonFactory(),
new HttpRequestInitializer() {
public void initialize(HttpRequest httpRequest) { }
});
messageEndpoint = CloudEndpointUtils.updateBuilder(endpointBuilder).build();
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
/*
* If we are dealing with an intent generated by the GCMIntentService
* class, then display the provided message.
*/
if (intent.getBooleanExtra("gcmIntentServiceMessage", false)) {
showDialog(intent.getStringExtra("message"));
if (intent.getBooleanExtra("registrationMessage", false)) {
if (intent.getBooleanExtra("error", false)) {
/*
* If we get a registration/unregistration-related error,
* and we're in the process of registering, then we move
* back to the unregistered state. If we're in the process
* of unregistering, then we move back to the registered
* state.
*/
if (curState == State.REGISTERING) {
updateState(State.UNREGISTERED);
} else {
updateState(State.REGISTERED);
}
} else {
/*
* If we get a registration/unregistration-related success,
* and we're in the process of registering, then we move to
* the registered state. If we're in the process of
* unregistering, the we move back to the unregistered
* state.
*/
if (curState == State.REGISTERING) {
updateState(State.REGISTERED);
} else {
updateState(State.UNREGISTERED);
}
}
}
else {
/*
* if we didn't get a registration/unregistration message then
* go get the last 5 messages from app-engine
*/
new QueryMessagesTask(this, messageEndpoint).execute();
}
}
}
private void updateState(State newState) {
Button registerButton = (Button) findViewById(R.id.regButton);
switch (newState) {
case REGISTERED:
registerButton.setText("Unregister");
registerButton.setOnTouchListener(unregisterListener);
registerButton.setEnabled(true);
break;
case REGISTERING:
registerButton.setText("Registering...");
registerButton.setEnabled(false);
break;
case UNREGISTERED:
registerButton.setText("Register");
registerButton.setOnTouchListener(registerListener);
registerButton.setEnabled(true);
break;
case UNREGISTERING:
registerButton.setText("Unregistering...");
registerButton.setEnabled(false);
break;
}
curState = newState;
}
private void showDialog(String message) {
new AlertDialog.Builder(this)
.setMessage(message)
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.dismiss();
}
}).show();
}
/*
* Need to run this in background so we don't hold up the UI thread,
* this task will ask the App Engine backend for the last 5 messages
* sent to it
*/
private class QueryMessagesTask
extends AsyncTask<Void, Void, CollectionResponseMessageData> {
Exception exceptionThrown = null;
Activity activity;
MessageEndpoint messageEndpoint;
public QueryMessagesTask(Activity activity, MessageEndpoint messageEndpoint) {
this.activity = activity;
this.messageEndpoint = messageEndpoint;
}
@Override
protected CollectionResponseMessageData doInBackground(Void... params) {
try {
CollectionResponseMessageData messages =
messageEndpoint.listMessages().setLimit(5).execute();
return messages;
} catch (IOException e) {
exceptionThrown = e;
return null;
//Handle exception in PostExecute
}
}
protected void onPostExecute(CollectionResponseMessageData messages) {
// Check if exception was thrown
if (exceptionThrown != null) {
Log.e(RegisterActivity.class.getName(),
"Exception when listing Messages", exceptionThrown);
showDialog("Failed to retrieve the last 5 messages from " +
"the endpoint at " + messageEndpoint.getBaseUrl() +
", check log for details");
}
else {
TextView messageView = (TextView) findViewById(R.id.msgView);
messageView.setText("Last 5 Messages read from " +
messageEndpoint.getBaseUrl() + ":\n");
for(MessageData message : messages.getItems()) {
messageView.append(message.getMessage() + "\n");
}
}
}
}
}
