我正在为我的新闻应用程序发送推送通知服务，我正在使用新的GoogleCloudMessaging（GCM）从我的php服务器发送通知，当消息到达手机时，我的应用程序捕获消息并制作一个通知，当您单击通知时，它将带您进入DemoActivity（这是此演示应用程序中的主要活动）并在TextView中显示文本。现在这对于我从服务器发送的第一条消息非常有效，但是当我在第一条消息之后发送消息时，它们会到达手机并且我的应用程序正确发出通知，但是当我点击通知时它始终显示第一条消息。
这是我的代码：
这是DemoActivity：
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.gcm.GoogleCloudMessaging;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
public class DemoActivity extends Activity {
public static final String EXTRA_MESSAGE = "message";
public static final String PROPERTY_REG_ID = "registration_id";
private static final String PROPERTY_APP_VERSION = "appVersion";
private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 9000;
/**
* Substitute you own sender ID here. This is the project number you got
* from the API Console, as described in "Getting Started."
*/
String SENDER_ID = "Sender id";
/**
* Tag used on log messages.
*/
static final String TAG = "GCMDemo";
TextView mDisplay;
GoogleCloudMessaging gcm;
AtomicInteger msgId = new AtomicInteger();
SharedPreferences prefs;
Context context;
String notificationText;
String regid;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mDisplay = (TextView) findViewById(R.id.display);
context = getApplicationContext();
// Check device for Play Services APK. If check succeeds, proceed with
// GCM registration.
if (checkPlayServices()) {
gcm = GoogleCloudMessaging.getInstance(this);
regid = getRegistrationId(context);
if (regid.isEmpty()) {
registerInBackground();
}
} else {
Log.i(TAG, "No valid Google Play Services APK found.");
}
}
/**
* Gets the current registration ID for application on GCM service.
* <p>
* If result is empty, the app needs to register.
*
* @return registration ID, or empty string if there is no existing
* registration ID.
*/
private String getRegistrationId(Context context) {
final SharedPreferences prefs = getGCMPreferences(context);
String registrationId = prefs.getString(PROPERTY_REG_ID, "");
if (registrationId.isEmpty()) {
Log.i(TAG, "Registration not found.");
return "";
}
// Check if app was updated; if so, it must clear the registration ID
// since the existing registration ID is not guaranteed to work with
// the new app version.
int registeredVersion = prefs.getInt(PROPERTY_APP_VERSION, Integer.MIN_VALUE);
int currentVersion = getAppVersion(context);
if (registeredVersion != currentVersion) {
Log.i(TAG, "App version changed.");
return "";
}
return registrationId;
}
/**
* @return Application's {@code SharedPreferences}.
*/
private SharedPreferences getGCMPreferences(Context context) {
// This sample app persists the registration ID in shared preferences, but
// how you store the registration ID in your app is up to you.
return getSharedPreferences(DemoActivity.class.getSimpleName(),
Context.MODE_PRIVATE);
}
/**
* @return Application's version code from the {@code PackageManager}.
*/
private static int getAppVersion(Context context) {
try {
PackageInfo packageInfo = context.getPackageManager()
.getPackageInfo(context.getPackageName(), 0);
return packageInfo.versionCode;
} catch (PackageManager.NameNotFoundException e) {
// should never happen
throw new RuntimeException("Could not get package name: " + e);
}
}
/**
* Registers the application with GCM servers asynchronously.
* <p>
* Stores the registration ID and app versionCode in the application's
* shared preferences.
*/
private void registerInBackground() {
new AsyncTask<Void,Void,String>() {
@Override
protected String doInBackground(Void... params) {
String msg = "";
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(context);
}
regid = gcm.register(SENDER_ID);
msg = "Device registered, registration ID=" + regid;
// You should send the registration ID to your server over HTTP,
// so it can use GCM/HTTP or CCS to send messages to your app.
// The request to your server should be authenticated if your app
// is using accounts.
sendRegistrationIdToBackend();
// For this demo: we don't need to send it because the device
// will send upstream messages to a server that echo back the
// message using the 'from' address in the message.
// Persist the registration ID - no need to register again.
storeRegistrationId(context, regid);
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
// If there is an error, don't just keep trying to register.
// Require the user to click a button again, or perform
// exponential back-off.
}
return msg;
}
@Override
protected void onPostExecute(String msg) {
mDisplay.append(msg + "\n");
}
}.execute();
}
/**
* Sends the registration ID to your server over HTTP, so it can use GCM/HTTP
* or CCS to send messages to your app. Not needed for this demo since the
* device sends upstream messages to a server that echoes back the message
* using the 'from' address in the message.
*/
private void sendRegistrationIdToBackend() {
// Your server-side implementation here.
}
/**
* Stores the registration ID and app versionCode in the application's
* {@code SharedPreferences}.
*
* @param context application's context.
* @param regId registration ID
*/
private void storeRegistrationId(Context context, String regId) {
final SharedPreferences prefs = getGCMPreferences(context);
int appVersion = getAppVersion(context);
Log.i(TAG, "Saving regId on app version " + appVersion);
SharedPreferences.Editor editor = prefs.edit();
editor.putString(PROPERTY_REG_ID, regId);
editor.putInt(PROPERTY_APP_VERSION, appVersion);
editor.commit();
}
/**
* Check the device to make sure it has the Google Play Services APK. If
* it doesn't, display a dialog that allows users to download the APK from
* the Google Play Store or enable it in the device's system settings.
*/
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Log.i(TAG, "This device is not supported.");
finish();
}
return false;
}
return true;
}
// You need to do the Play Services APK check here too.
@Override
protected void onResume() {
super.onResume();
checkPlayServices();
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Bundle extras = intent.getExtras();
if (extras != null) {
notificationText = extras.getString("theMsg");
mDisplay.setText(notificationText);
}
}
}
这是GCMBroadcastReceiver：
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.content.WakefulBroadcastReceiver;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;
public class GcmBroadcastReceiver extends WakefulBroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// Explicitly specify that GcmIntentService will handle the intent.
ComponentName comp = new ComponentName(context.getPackageName(),
GcmIntentService.class.getName());
// Start the service, keeping the device awake while it is launching.
startWakefulService(context, (intent.setComponent(comp)));
setResultCode(Activity.RESULT_OK);
}
}
这个GCMIntentService：
import android.app.IntentService;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import com.google.android.gms.gcm.GoogleCloudMessaging;
public class GcmIntentService extends IntentService {
public static final int NOTIFICATION_ID = 1;
static final String TAG = "GCMDemo";
NotificationCompat.Builder builder;
public GcmIntentService() {
super("GcmIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
Bundle extras = intent.getExtras();
GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
// The getMessageType() intent parameter must be the intent you received
// in your BroadcastReceiver.
String messageType = gcm.getMessageType(intent);
if (!extras.isEmpty()) { // has effect of unparcelling Bundle
/*
* Filter messages based on message type. Since it is likely that GCM
* will be extended in the future with new message types, just ignore
* any message types you're not interested in, or that you don't
* recognize.
*/
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(), "");
// If it's a regular GCM message, do some work.
} else if (GoogleCloudMessaging.
MESSAGE_TYPE_MESSAGE.equals(messageType)) {
// This loop represents the service doing some work.
/*for (int i=0; i<5; i++) {
Log.i(TAG, "Working... " + (i+1)
+ "/5 @ " + SystemClock.elapsedRealtime());
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
}*/
//Log.i(TAG, "Completed work @ " + SystemClock.elapsedRealtime());
Log.i(TAG, "Received a notification");
// Post notification of received message.
sendNotification(extras.get("price").toString(), extras.get("id").toString());
Log.i(TAG, "Received: " + extras.toString());
}
}
// Release the wake lock provided by the WakefulBroadcastReceiver.
GcmBroadcastReceiver.completeWakefulIntent(intent);
}
// Put the message into a notification and post it.
// This is just one simple example of what you might choose to do with
// a GCM message.
private void sendNotification(String msg, String id) {
Intent notificationIntent = new Intent(this, DemoActivity.class);
notificationIntent.putExtra("theMsg",msg);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
NotificationManager mNotificationManager = (NotificationManager)
this.getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(
this,
0,
notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_stat_gcm)
.setContentTitle("GCM Notification")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(msg))
.setContentText(msg);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}
}
这是AndroidManifest：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="fm.ana.officialgcmtest">
<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="com.google.android.c2dm.permission.RECEIVE" />
<permission android:name="fm.ana.officialgcmtest.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="fm.ana.officialgcmtest.permission.C2D_MESSAGE" />
<application android:allowBackup="true" android:label="@string/app_name"
android:icon="@mipmap/ic_launcher" android:theme="@style/AppTheme">
<activity android:name=".NotificationHandler" />
<activity
android:name=".DemoActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<receiver
android:name=".GcmBroadcastReceiver"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="fm.ana.officialgcmtest" />
</intent-filter>
</receiver>
<service android:name=".GcmIntentService" />
</application>
</manifest>
我进行了一些研究，我发现在调用getIntent（）时我必须告诉应用程序获取新的意图，但我无法正确地做到这一点。
任何人都可以提供帮助吗？
答案 0 :(得分：2)
当你使用FLAG_ACTIVITY_NEW_TASK时，它意味着很多东西（请参阅链接了解更多内容）但在你的情况下最重要的是，当一个活动已经创建时，它不会再被重新创建，而是它将会被重建带回到前台，并以新意图重新开始。
在您的演示活动中，只有在创建活动时才调用getIntent（并且只发生一次，无论用户点击您在意图上传递的标记上的通知基数多少）
因此，当用户点击通知时获取新意图请覆盖onNewIntent（意图意图）;
示例
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Bundle extras = intent.getExtras();
if (extras != null) {
notificationText = extras.getString("theMsg");
mDisplay.setText(notificationText);
}
}
您甚至可以在onCreate（）方法中删除该行。瞧！我相信它现在应该有效。
祝你好运！ 编辑：为了使其正常工作，您需要设置您的意图标志如下：intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
另外，请不要删除onCreate中的行，因为如果您收到通知并且尚未创建活动，则需要它。