我正在使用android GCM来显示一些通知。它工作正常。但是当我添加一个可以让我在点击通知时启动Home活动的代码时,它会崩溃。如果我删除PendingIntent它工作正常但没有动作。
以下是我正在使用的代码
public class GcmMessageHandler extends GcmListenerService {
public static final int MESSAGE_NOTIFICATION_ID = 435345;
Intent intent = new Intent(GcmMessageHandler.this, HomeActivity.class);
int requestID = (int) System.currentTimeMillis(); //unique requestID to differentiate between various notification with same NotifId
int flags = PendingIntent.FLAG_CANCEL_CURRENT; // cancel old intent and create new one
PendingIntent pIntent = PendingIntent.getActivity(this, requestID, intent, flags);
@Override
public void onMessageReceived(String from, Bundle data) {
String message = data.getString("message");
createNotification(from, message);
}
// Creates notification based on title and body received
private void createNotification(String title, String body) {
Context context = getBaseContext();
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setContentText(body)
.setContentIntent(pIntent);
mBuilder.setAutoCancel(true);
NotificationManager mNotificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(MESSAGE_NOTIFICATION_ID, mBuilder.build());
}
}
以下是我得到的错误日志。
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: FATAL EXCEPTION: main
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: Process: abenakebe.yournet.com.abenakebe, PID: 14201
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: java.lang.RuntimeException: Unable to instantiate service abenakebe.yournet.com.abenakebe.utils.GcmMessageHandler: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:3623)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.access$2000(ActivityThread.java:198)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1759)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.os.Looper.loop(Looper.java:145)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6837)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:101)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.PendingIntent.getActivity(PendingIntent.java:286)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.PendingIntent.getActivity(PendingIntent.java:252)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at abenakebe.yournet.com.abenakebe.utils.GcmMessageHandler.<init>(GcmMessageHandler.java:25)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.reflect.Constructor.newInstance(Native Method)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.Class.newInstance(Class.java:1684)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:3620)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.access$2000(ActivityThread.java:198)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1759)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.os.Looper.loop(Looper.java:145)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6837)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
04-14 23:24:59.165 14201-14201/abenakebe.yournet.com.abenakebe E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
答案 0 :(得分:0)
您应该将这两件事至少移到onCreate()
或onMessageReceived()
Intent intent = new Intent(GcmMessageHandler.this, HomeActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(this, requestID, intent, flags);
崩溃是因为this
在调用Context
之前没有onCreate
。
应该是这样的:
public class GcmMessageHandler extends GcmListenerService {
public static final int MESSAGE_NOTIFICATION_ID = 435345;
Intent intent;
int requestID = (int) System.currentTimeMillis(); //unique requestID to differentiate between various notification with same NotifId
int flags = PendingIntent.FLAG_CANCEL_CURRENT; // cancel old intent and create new one
PendingIntent pIntent;
@Override
public void onMessageReceived(String from, Bundle data) {
String message = data.getString("message");
intent = new Intent(GcmMessageHandler.this, HomeActivity.class);
pIntent = PendingIntent.getActivity(this, requestID, intent, flags);
createNotification(from, message);
}
// Creates notification based on title and body received
private void createNotification(String title, String body) {
Context context = getBaseContext();
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setContentText(body)
.setContentIntent(pIntent);
mBuilder.setAutoCancel(true);
NotificationManager mNotificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(MESSAGE_NOTIFICATION_ID, mBuilder.build());
}
}