哪位高手有c2dm的相关资料，最好有实例

谁有c2dm的相关资料，最好有实例
谁有c2dm的相关资料，最好有实例
google的开发文档也看过了，但没看明白，感觉很乱
下面是我写的程序，但没获得registration id

Java code

package com.c2dm_client1;import com.c2dm_client1.R;import android.app.Activity;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.widget.EditText;public class c2dm_client1 extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                Intent registrationIntent = new Intent("com.google.android.c2dm.REGISTER");        //这里的new intent需要改为自己的intent吗？？        registrationIntent.putExtra("app", PendingIntent.getBroadcast(this, 0, new Intent(), 0));        registrationIntent.putExtra("sender", "XXXXX@gmail.com");        startService(registrationIntent);                EditText et1 = (EditText)findViewById(R.id.editText1);        et1.setText("wait for the register id...");    }        public void onReceive(Context context, Intent intent){        if ( intent.getAction().equals("com.google.android.c2dm.intent.REGISTRATION") ){            handleRegistration(context, intent);        }else if ( intent.getAction().equals("com.google.android.c2dm.intent.RECEIVE")){            handleReceive(context, intent);        }            }        private void handleRegistration(Context context, Intent intent){        String registration = intent.getStringExtra("registration_id");        String error = intent.getStringExtra("error");        String unregistration = intent.getStringExtra("ungistrered");                if ( error != null ){            //Registration failed,should try again later.            EditText et1 = (EditText)findViewById(R.id.editText1);            et1.setText(et1.getText() + "error!  ");        }else if ( unregistration != null ){            //Unregistration done, new messages from the authorized sender will be rejected.            EditText et1 = (EditText)findViewById(R.id.editText1);            et1.setText(et1.getText() + "unregistration!  ");        }        else if ( registration != null ){            //Send the registration ID to the 3rd party site that is sending the messages.            //This should be done in separate thread.            //When done,remember that all registration is done.            EditText et1 = (EditText)findViewById(R.id.editText1);            et1.setText(et1.getText() + registration);        }    }        private void handleReceive(Context context, Intent intent){        EditText et1 = (EditText)findViewById(R.id.editText1);        et1.setText(et1.getText() + "Get from the 3rd server!  ");    }}

XML code

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.c2dm_client1"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".c2dm_client1"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>        <!-- only this application can receive the c2dm messages -->    <permission android:name="com.c2dm_client1.c2dm_client1.permission.C2D_MESSAGE"        android:protectionLevel="signature" />    <uses-permission android:name="com.c2dm_client1.c2dm_client1.permission.C2D_MESSAGE" />        <!-- this application has permission to register and receive message -->    <uses-permission android:name="com.google.android.c2dm.permission.C2D_MESSAGE" />        <!-- This application has permission to use the internet.(To send connect the server) -->    <uses-permission android:name="android.permission.INTERNET" />     <!-- Only C2DM servers can send messages for the app. If permission is not set - any other app can generate it -->        <receiver android:name=".C2DMReceiver"         android:permission="com.google.android.c2dm.permission.SEND">        <!-- Receive the actual messages -->        <intent-filter>            <action android:name="com.google.android.c2dm.intent.RECEIVE" />            <category android:name="com.c2dm_client1.c2dm_client1" />        </intent-filter>        <!-- Receive the registration id -->        <intent-filter>            <action android:name="com.google.android.c2dm.intent.REGISTRATION" />            <category android:name="com.c2dm_client1.c2dm_client1" />        </intent-filter>    </receiver></manifest>