這篇主要會講解Android端如何實作，其實和以前在C2DM時差不多
如果要看差異以及一些參數說明，可以到下面幾篇文章去看
第一篇在講參數說明
第二篇在講流程說明
這裡就直接進入主題，
首先一樣要在Manifest檔案中，要有下列的permission，
<permission android:name="net.kenyang.gcm.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="net.kenyang.gcm.permission.C2D_MESSAGE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
接著就是要新增一個receiver，
而receiver必須聆聽兩個事件，分別為receive以及registration！
<receiver
android:name="net.kenyang.gcm.GcmBroadcastReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<action android:name="com.google.android.c2dm.intent.REGISTRATION" />
<category android:name="net.kenyang" />
</intent-filter>
</receiver>
再寫code之前，請先確定你的eclipse有裝下面的兩個plugin，
安裝完成以後，請去到你的sdk folder裡面找到下面兩個jar檔，並且include他們兩個！
- android-sdk-macosx/extras/google/gcm/gcm-client/dist/gcm.jar
- android-sdk-macosx/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar
接著開始寫code，
android分為三個部分，
- 向Google 註冊，並且取得registration id
- 傳送id給我們的server
- 準備接收資料
首先是註冊，記得改成你的sender_id！
sender_id就是你的project id，可以到api console去看你的id，
會有下圖，project number就是你的project id了！
記得把它填入sender_id中！
GoogleCloudMessaging gcm;
String SENDER_ID = "xxxxxxxxxxx";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvRegisterMsg = (TextView) findViewById(R.id.tvRegisterMsg);
context = getApplicationContext();
// initial GCM
gcm = GoogleCloudMessaging.getInstance(this);
// register with Google.
new AsyncTask<Void,String,String>() {
@Override
protected String doInBackground(Void... params) {
String msg = "";
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(context);
}
strRegId = gcm.register(SENDER_ID);
msg = "Device registered, registration id=" + strRegId;
// send id to our server
sendRegIdToServer(strRegId);
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
}
return msg;
}
@Override
protected void onPostExecute(String msg) {
tvRegisterMsg.append(msg + "\n");
}
}.execute(null, null, null);
}
接著是第二部分，把id傳送到我們的server，
private void sendRegIdToServer(final String strId) {
new AsyncTask<Void,String,String>() {
@Override
protected String doInBackground(Void... params) {
String strResponseCode = "";
try {
HttpRequestBase request =null;
request = new HttpGet(new URI("http://your_server/storeRegId?id="+strId));
request.addHeader("User-Agent", "Android");
HttpResponse response = Connection.connect((HttpGet)request);
strResponseCode = String.valueOf(response.getStatusLine().getStatusCode());
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return strResponseCode;
}
@Override
protected void onPostExecute(String msg) {
tvRegisterMsg.append("status code: " + msg + "\n");
}
}.execute(null, null, null);
}
到了此步驟你在畫面上應該會看到registration_id和status code是200！
如果是上述的結果的話，就代表你向Google註冊成功了！以及也把registration id傳送給我們的server知道了！
接著就來implement receiver的部分！
這個receiver會接收來自Google Server的資料，
並且把資料丟到我們的notification bar當中！
public class GcmBroadcastReceiver extends BroadcastReceiver {
static final String TAG = "GCMDemo";
public static final int NOTIFICATION_ID = 1;
private NotificationManager mNotificationManager;
NotificationCompat.Builder builder;
Context ctx;
@Override
public void onReceive(Context context, Intent intent) {
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(context);
ctx = context;
String messageType = gcm.getMessageType(intent);
if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
sendNotification("Send error: " + intent.getExtras().toString());
} else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED .equals(messageType)) {
sendNotification("Deleted messages on server: " + intent.getExtras().toString());
} else {
sendNotification("Received: " + intent.getExtras().toString());
}
setResultCode(Activity.RESULT_OK);
}
// Put the GCM message into a notification and post it.
private void sendNotification(String msg) {
mNotificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(ctx, 0,
new Intent(ctx, Main.class), 0);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(ctx)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("GCM Notification")
.setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
.setContentText(msg);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
}
完成上述以後你就可以開始測試！
只要打開瀏覽器，然後輸入你的site，（http://your_site/send），
接著你的device上應該就會收到訊息了！
訊息會是一個json格式！