4.2. Create receivers and activities
Create the following class "C2DMReceiverReceiver" and
"C2DMMessageReceiver" which we will later
registers as receivers for
the registration intent and the message intent.
package de.vogella.android.c2dm.simpleclient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;
import android.provider.Settings.Secure;
import android.util.Log;
public class C2DMRegistrationReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.w("C2DM", "Registration Receiver called");
if ("com.google.android.c2dm.intent.REGISTRATION".equals(action)) {
Log.w("C2DM", "Received registration ID");
final String registrationId = intent
.getStringExtra("registration_id");
String error = intent.getStringExtra("error");
Log.d("C2DM", "dmControl: registrationId = " + registrationId
+ ", error = " + error);
String deviceId = Secure.getString(context.getContentResolver(),
Secure.ANDROID_ID);
createNotification(context, registrationId);
sendRegistrationIdToServer(deviceId, registrationId);
saveRegistrationId(context, registrationId);
}
}
private void saveRegistrationId(Context context, String registrationId) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
Editor edit = prefs.edit();
edit.putString(C2DMClientActivity.AUTH, registrationId);
edit.commit();
}
public void createNotification(Context context, String registrationId) {
NotificationManager notificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.icon,
"Registration successful", System.currentTimeMillis());
notification.flags |= Notification.FLAG_AUTO_CANCEL;
Intent intent = new Intent(context, RegistrationResultActivity.class);
intent.putExtra("registration_id", registrationId);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
intent, 0);
notification.setLatestEventInfo(context, "Registration",
"Successfully registered", pendingIntent);
notificationManager.notify(0, notification);
}
public void sendRegistrationIdToServer(String deviceId,
String registrationId) {
Log.d("C2DM", "Sending registration ID to my application server");
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://vogellac2dm.appspot.com/register");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("deviceid", deviceId));
nameValuePairs.add(new BasicNameValuePair("registrationid",
registrationId));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = "";
while ((line = rd.readLine()) != null) {
Log.e("HttpResponse", line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
package de.vogella.android.c2dm.simpleclient;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class C2DMMessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.w("C2DM", "Message Receiver called");
if ("com.google.android.c2dm.intent.RECEIVE".equals(action)) {
Log.w("C2DM", "Received message");
final String payload = intent.getStringExtra("payload");
Log.d("C2DM", "dmControl: payload = " + payload);
createNotification(context, payload);
}
}
public void createNotification(Context context, String payload) {
NotificationManager notificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.icon,
"Message received", System.currentTimeMillis());
notification.flags |= Notification.FLAG_AUTO_CANCEL;
Intent intent = new Intent(context, MessageReceivedActivity.class);
intent.putExtra("payload", payload);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
intent, 0);
notification.setLatestEventInfo(context, "Message",
"New message received", pendingIntent);
notificationManager.notify(0, notification);
}
}
Also create the following two Activities which we will use to
see the results.
package de.vogella.android.c2dm.simpleclient;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class RegistrationResultActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_result);
Bundle extras = getIntent().getExtras();
if (extras != null) {
String registrationId = extras.getString("registration_id");
if (registrationId != null && registrationId.length() > 0) {
TextView view = (TextView) findViewById(R.id.result);
view.setText(registrationId);
}
}
super.onCreate(savedInstanceState);
}
}
package de.vogella.android.c2dm.simpleclient;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class MessageReceivedActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_result);
Bundle extras = getIntent().getExtras();
if (extras != null) {
String message = extras.getString("payload");
if (message != null && message.length() > 0) {
TextView view = (TextView) findViewById(R.id.result);
view.setText(message);
}
}
super.onCreate(savedInstanceState);
}
}
Create the following
AndroidManifest.xml
file. That will register
the Intent Receivers, Activities and requests
the required
permissions.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.vogella.android.c2dm.simpleclient"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<permission
android:name="de.vogella.android.c2dm.simpleclient.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission
android:name="de.vogella.android.c2dm.simpleclient.permission.C2D_MESSAGE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="@drawable/icon"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".C2DMClientActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".C2DMRegistrationReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter >
<action android:name="com.google.android.c2dm.intent.REGISTRATION" >
</action>
<category android:name="de.vogella.android.c2dm.simpleclient" />
</intent-filter>
</receiver>
<receiver
android:name=".C2DMMessageReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter >
<action android:name="com.google.android.c2dm.intent.RECEIVE" >
</action>
<category android:name="de.vogella.android.c2dm.simpleclient" />
</intent-filter>
</receiver>
<activity android:name="RegistrationResultActivity" >
</activity>
<activity android:name="MessageReceivedActivity" >
</activity>
</application>
</manifest>
Change your "C2DMClientActivity" class to the following.
package de.vogella.android.c2dm.simpleclient;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class C2DMClientActivity extends Activity {
public final static String AUTH = "authentication";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void register(View view) {
Log.w("C2DM", "start registration process");
Intent intent = new Intent("com.google.android.c2dm.intent.REGISTER");
intent.putExtra("app",
PendingIntent.getBroadcast(this, 0, new Intent(), 0));
intent.putExtra("sender", "nonsenses@gmail.com");
startService(intent);
}
public void showRegistrationId(View view) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(this);
String string = prefs.getString(AUTH, "n/a");
Toast.makeText(this, string, Toast.LENGTH_LONG).show();
Log.d("C2DM RegId", string);
}
}
The methods in the activity are connected to the buttons via
the onclick property of the buttons. The first button
triggers a
request for a registration ID and the second button shows the
saved
registration key. Both also write the registration id also to the
Logcat View.
Copy the registration Id from the Logcat View so that you can
later use it in your server implementation.
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