我按照本教程http://www.vogella.com/articles/AndroidCloudToDeviceMessaging/article.html 我编写了清单文件，提供了所有足够的权限。但是我的注册 ID 为空。请帮助这是我写的代码：
public class C2DMClientActivity extends Activity {
/** Called when the activity is first created. */
final static String AUTH="authentication";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void register(View view){//Register Button onclick event
Log.w("C2DM","startRegistrationProcess");
Intent intent=new Intent("com.google.android.c2dm.intent.REGISTER");
intent.putExtra("app",PendingIntent.getBroadcast(this, 0, new Intent(), 0));
intent.putExtra("sender","shubhamjindal18@gmail.com");
startService(intent);
}
public void showRegistrationId(View view){//Show button onclick event
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);
}
}
public class C2DMRegistrationReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
String string=intent.getAction();
Log.w("C2DM","Registration Receiver Called");
if ("com.google.android.c2dm.intent.REGISTRATION".equals(string)){
Log.w("C2DM", "Received registration ID");
final String str=intent.getStringExtra("registation_id");
final String error=intent.getStringExtra("error");
Log.d("C2DM", "dmControl: registrationId = " + str
+ ", error = " + error);
String deviceId = Secure.getString(context.getContentResolver(),
Secure.ANDROID_ID);
createNotification(context, str);
sendRegistrationIdToServer(deviceId,str);
saveRegistrationId(context,str);
}
}
public void saveRegistrationId(Context context,String str){
SharedPreferences prefs=PreferenceManager.getDefaultSharedPreferences(context);
Editor edit=prefs.edit();
edit.putString(C2DMClientActivity.AUTH,str);
edit.commit();
}
public void createNotification(Context context,String str){
NotificationManager notim=(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification noti=new Notification(R.drawable.ic_launcher,"Registation Successful",System.currentTimeMillis());
noti.flags|=Notification.FLAG_AUTO_CANCEL;
Intent intent=new Intent(context,RegistrationResultActivity.class);
intent.putExtra("registration_id", str);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
intent, 0);
noti.setLatestEventInfo(context, "Registration",
"Successfully registered", pendingIntent);
notim.notify(0, noti);
}
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("");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
// Get the deviceID
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();
}
}
}
public class RegistrationResultActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity);
Bundle extras=getIntent().getExtras();
if (extras!=null){
String str=extras.getString("registration_id");
TextView tv=(TextView) findViewById(R.id.textView1);
tv.setText(str);
}
super.onCreate(savedInstanceState);
}
}
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);
createNoti(context,payload);
}
}
public void createNoti(Context context,String str){
NotificationManager notim=(NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
Notification noti=new Notification(R.drawable.ic_launcher,"Message received",System.currentTimeMillis());
noti.flags|=Notification.FLAG_AUTO_CANCEL;
Intent intent=new Intent(context,MessageResultActivity.class);
intent.putExtra("payload",str);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
intent, 0);
noti.setLatestEventInfo(context, "Message",
"New message received", pendingIntent);
notim.notify(0, noti);
}
}
public class MessageResultActivity extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity);
Bundle extras=getIntent().getExtras();
if (extras!=null){
String payload=extras.getString("payload");
TextView tv=(TextView) findViewById(R.id.textView1);
tv.setText(payload);
}
super.onCreate(savedInstanceState);
}
}