[英]OneSignal Push Notification Click to open activity
I have integrated one signal library for push notification.我已经集成了一个用于推送通知的信号库。 I want to open a particular activity from click of push notification while app is not running I am receiving push notification but while I am clicking on notification the app crashes.我想在应用程序未运行时通过点击推送通知打开特定活动 我收到推送通知但当我点击通知时应用程序崩溃。 Here is my code for notification receiver这是我的通知接收器代码
public class ExampleNotificationOpenedHandler implements OneSignal.NotificationOpenedHandler
{
Context context;
@Override
public void notificationOpened(OSNotificationOpenResult result) {
OSNotificationAction.ActionType actionType = result.action.type;
JSONObject data = result.notification.payload.additionalData;
String customKey;
if (data != null) {
customKey = data.optString("customkey", null);
if (customKey != null)
Log.e("OneSignalExample", "customkey set with value: " + customKey);
}
if (actionType == OSNotificationAction.ActionType.ActionTaken)
Log.i("OneSignalExample", "Button pressed with id: " + result.action.actionID);
Intent intent = new Intent(context, User_Detail.class);
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
here is my error msg这是我的错误消息
Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
I just missed to build constructor in class before onReceivedMethod我只是错过了在 onReceivedMethod 之前在课堂上构建构造函数
Context context2;
ExampleNotificationOpenedHandler(Context context) {
context2 = context;
}
@Override
public void notificationOpened(OSNotificationOpenResult result) {
OSNotificationAction.ActionType actionType = result.action.type;
JSONObject data = result.notification.payload.additionalData;
String customKey;
Intent intent = new Intent(context2,User_Detail.class);
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);
context2.startActivity(intent);
if (data != null) {
customKey = data.optString("customkey", null);
if (customKey != null)
Log.e("OneSignalExample", "customkey set with value: " + customKey);
}
if (actionType == OSNotificationAction.ActionType.ActionTaken)
{
Log.i("OneSignalExample", "Button pressed with id: " + result.action.actionID);
}
and also pass context in Application class并在 Application 类中传递上下文
@Override
public void onCreate() {
super.onCreate();
mInstance = this;
OneSignal.startInit(this)
.setNotificationOpenedHandler(new ExampleNotificationOpenedHandler(this))
.init();
}
This means that context
variable is null.这意味着context
变量为空。
If you look in source code of Intent with picked construcor如果您使用选择的构造函数查看 Intent 的源代码
public Intent(Context packageContext, Class<?> cls) {
mComponent = new ComponentName(packageContext, cls);
}
And ComponentName
construcor和ComponentName
构造函数
public ComponentName(Context pkg, String cls) {
if (cls == null) throw new NullPointerException("class name is null");
mPackage = pkg.getPackageName(); //here you get crash
mClass = cls;
}
You can use DI to provide context, for example Dagger2.您可以使用 DI 来提供上下文,例如 Dagger2。
Or implement application class或者实现应用类
public class DemoApp extends Application {
private static DemoApp instance;
@Override
public void onCreate() {
instance = this;
super.onCreate();
}
public static DemoApp getInstance() {
return instance;
}
}
And in your manifest在你的清单中
<application
android:name=".demo.DemoApp"
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