如何解决如何在Android中实现C2DM？
| 我正在搜索有关如何使用C2DM发送通知的信息。我发现了一些东西，并使用它可以生成Registration Key
Authentication Key
ServerSimulator
public class ServerSimulator extends Activity
{
private SharedPreferences prefManager;
private final static String AUTH = \"authentication\";
private static final String UPDATE_CLIENT_AUTH = \"Update-Client-Auth\";
public static final String PARAM_REGISTRATION_ID = \"registration_id\";
public static final String PARAM_DELAY_WHILE_IDLE = \"delay_while_idle\";
public static final String PARAM_COLLAPSE_KEY = \"collapse_key\";
private static final String UTF8 = \"UTF-8\";
// Registration is currently hardcoded
private final static String YOUR_REGISTRATION_STRING = \"APA91bFkxmtIj5XiBU-Cze64s0gXNb7OmiWWZg-qLKibpLsVXaWq1X7hoRV9Ld9COYXirZAgkYegZBdBfUGt3lgtuhNJopvHB0KJ5ZyJ6Kt_HYRrZhgdJ1Y\";
private SharedPreferences prefs;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
prefManager = PreferenceManager.getDefaultSharedPreferences(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.mymenu,menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menuitem_user:
Intent intent = new Intent(this,UserPreferences.class);
startActivity(intent);
break;
default:
break;
}
return false;
}
public void getAuthentification(View view) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(this);
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
\"https://www.google.com/accounts/ClientLogin\");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair(\"Email\",\"myEmail id\")));
nameValuePairs.add(new BasicNameValuePair(\"Passwd\",\"my password\")));
nameValuePairs.add(new BasicNameValuePair(\"accountType\",\"GOOGLE\"));
nameValuePairs.add(new BasicNameValuePair(\"source\",\"Google-cURL-Example\"));
nameValuePairs.add(new BasicNameValuePair(\"service\",\"ac2dm\"));
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);
if (line.startsWith(\"Auth=\")) {
Editor edit = prefManager.edit();
edit.putString(AUTH,line.substring(5));
edit.commit();
String s = prefManager.getString(AUTH,\"n/a\");
Toast.makeText(this,s,Toast.LENGTH_LONG).show();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public void showAuthentification(View view) {
String s = prefManager.getString(AUTH,\"n/a\");
Toast.makeText(this,Toast.LENGTH_LONG).show();
}
public void sendMessage(View view) {
try {
Log.e(\"Tag\",\"Started\");
String auth_key = prefManager.getString(AUTH,\"n/a\");
// Send a sync message to this Android device.
StringBuilder postDataBuilder = new StringBuilder();
postDataBuilder.append(PARAM_REGISTRATION_ID).append(\"=\")
.append(YOUR_REGISTRATION_STRING);
// if (delayWhileIdle) {
// postDataBuilder.append(\"&\").append(PARAM_DELAY_WHILE_IDLE)
// .append(\"=1\");
// }
postDataBuilder.append(\"&\").append(PARAM_COLLAPSE_KEY).append(\"=\")
.append(\"0\");
postDataBuilder.append(\"&\").append(\"data.payload\").append(\"=\")
.append(URLEncoder.encode(\"Lars war hier\",UTF8));
byte[] postData = postDataBuilder.toString().getBytes(UTF8);
// Hit the dm URL.
URL url = new URL(\"https://android.clients.google.com/c2dm/send\");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod(\"POST\");
conn.setRequestProperty(\"Content-Type\",\"application/x-www-form-urlencoded;charset=UTF-8\");
conn.setRequestProperty(\"Content-Length\",Integer.toString(postData.length));
conn.setRequestProperty(\"Authorization\",\"GoogleLogin auth=\"
+ auth_key);
OutputStream out = conn.getOutputStream();
out.write(postData);
out.close();
int responseCode = conn.getResponseCode();
Log.e(\"Tag\",String.valueOf(responseCode));
// Validate the response code
if (responseCode == 401 || responseCode == 403) {
// The token is too old - return false to retry later,will
// fetch the token
// from DB. This happens if the password is changed or token
// expires. Either admin
// is updating the token,or Update-Client-Auth was received by
// another server,// and next retry will get the good one from database.
Log.e(\"C2DM\",\"Unauthorized - need token\");
}
// Check for updated token header
String updatedAuthToken = conn.getHeaderField(UPDATE_CLIENT_AUTH);
if (updatedAuthToken != null && !auth_key.equals(updatedAuthToken)) {
Log.i(\"C2DM\",\"Got updated auth token from datamessaging servers: \"
+ updatedAuthToken);
Editor edit = prefManager.edit();
edit.putString(AUTH,updatedAuthToken);
}
String responseLine = new BufferedReader(new InputStreamReader(
conn.getInputStream())).readLine();
// NOTE: You *MUST* use exponential backoff if you receive a 503
// response code.
// Since App Engine\'s task queue mechanism automatically does this
// for tasks that
// return non-success error codes,this is not explicitly
// implemented here.
// If we weren\'t using App Engine,we\'d need to manually implement
// this.
if (responseLine == null || responseLine.equals(\"\")) {
Log.i(\"C2DM\",\"Got \" + responseCode
+ \" response from Google AC2DM endpoint.\");
throw new IOException(
\"Got empty response from Google AC2DM endpoint.\");
}
String[] responseParts = responseLine.split(\"=\",2);
if (responseParts.length != 2) {
Log.e(\"C2DM\",\"Invalid message from google: \" + responseCode
+ \" \" + responseLine);
throw new IOException(\"Invalid response from Google \"
+ responseCode + \" \" + responseLine);
}
if (responseParts[0].equals(\"id\")) {
Log.i(\"Tag\",\"Successfully sent data message to device: \"
+ responseLine);
}
if (responseParts[0].equals(\"Error\")) {
String err = responseParts[1];
Log.w(\"C2DM\",\"Got error response from Google datamessaging endpoint: \"
+ err);
// No retry.
throw new IOException(err);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
解决方法
当前，您正在以较旧的方式实现C2DM。您的操作方式提供了很多可定制性，但是没有多少人需要这种可定制性。借助新的Google Plugin 2.4 Beta，他们实际上已经开始将其全部集成，并且非常不错。
我强烈建议您观看Google IO Android + AppEngine。他们展示了如何真正非常简单地将Android，AppEngine和C2DM集成在一起。您可以创建一个他们称为“ AppEngine Connected Android Project”的应用。因此，您实际上是在使用可以完全免费安装的真实服务器，而不是制作ServerSimulator。
http://www.youtube.com/watch?v=M7SxNNC429U
如果您想移至另一台服务器，则必须重新编写服务器端代码，然后只需更改其发布到的URL。很简单我强烈建议您查看此示例并使用股票代码，因为它为您提供了一些可以立即使用的功能：
仅供参考，在注册到真正的托管appengine服务器时，代码中目前存在错误（因为它在beta atm中）（在本地一切正常）。它尝试发送过期的注册令牌。我一直在与Google开发人员联系，他们为我提供了修复程序。让我知道您是否需要它。
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