Android GCM 收到消息总是返回 null

Question

我正在尝试在 Android 上进行推送通知。在服务器站点我使用的是 asp。我可以发送和接收通知，但无法处理我想在通知中显示的消息。 Mesaage 始终返回 null。这是我的 list :

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />

<permission android:name="com.example.pushnotificationexample.permission.C2D_MESSAGE" android:protectionLevel="signature" />

<uses-permission android:name="com.example.pushnotificationexample.permission.C2D_MESSAGE" />
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <meta-data android:name="com.google.android.gms.version"  android:value="@integer/google_play_services_version" />
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver
        android:name="com.example.pushnotificationexample.GcmBroadcastReceiver" android:exported="true"
        android:permission="com.google.android.c2dm.permission.SEND" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />

            <category android:name="com.example.pushnotificationexample" />
        </intent-filter>
    </receiver>

    <!-- Register Service -->

    <service android:name="com.example.pushnotificationexample.GcmIntentService" />
</application>

还有我的 GcmIntentService

@Override
    protected void onHandleIntent(Intent intent) {
        Bundle extras = intent.getExtras();
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);

        String messageType = gcm.getMessageType(intent);
        String s=extras.getString("message");
        //try to get message but always return null

        if (!extras.isEmpty()) {
            if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR
                    .equals(messageType)) {
                sendNotification("Send error: " + extras.toString());
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED
                    .equals(messageType)) {
                sendNotification("Deleted messages on server: "
                        + extras.toString());
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE
                    .equals(messageType)) {
                sendNotification("Warning: "
                        + extras.get("message"));
            }
        }
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

Answer 1

首先你需要知道这是服务器端还是客户端的问题。您可以在 phpfiddle.com 上运行这样的 fiddle .

<?php


// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'YOUR-API-ACCESS-KEY-GOES-HERE' );


$registrationIds = array("YOUR DEVICE IDS WILL GO HERE" );

// prep the bundle
$msg = array
(
    'message'       => 'here is a message. message',
    'title'         => 'This is a title. title',
    'subtitle'      => 'This is a subtitle. subtitle',
    'tickerText'    => 'Ticker text here...Ticker text here...Ticker text here',
    'vibrate'   => 1,
    'sound'     => 1
);

$fields = array
(
    'registration_ids'  => $registrationIds,
    'data'              => $msg
);

$headers = array
(
    'Authorization: key=' . API_ACCESS_KEY,
    'Content-Type: application/json'
);

$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://android.googleapis.com/gcm/send' );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
$result = curl_exec($ch );
curl_close( $ch );

echo $result;
?>

注意:在 google 开发者控制台上创建 API 访问 key 时，您必须使用 0.0.0.0/0 作为 ip 地址。 (用于测试目的)。

如果这能正常工作，那么它可能是恶意的客户端代码。最可能的错误是您正在读取错误的属性“消息”，以检查在 extras.getString("message") 之前插入的键并查看日志:

        Iterator<String> stringIterator = extras.keySet().iterator();
    if (stringIterator.hasNext()) {
        Log.d("a", "Amount of keys sent by server: '" + extras.keySet().size() + "' Existing key" + stringIterator.next());
    }