OneSignal 推送通知点击打开 activity

Question

我集成了一个推送通知信号库。我想通过点击推送通知打开一个特定的 activity 而应用程序不是运行我收到推送通知，但当我点击通知时，应用程序崩溃了。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);
}

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

Answer 1

这意味着 context 变量为空。

如果您使用已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);
}

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;
 }

您可以使用 DI 提供上下文，例如 Dagger2。

或实施应用class

public class DemoApp extends Application {

    private static DemoApp instance;

    @Override
    public void onCreate() {
        instance = this;
        super.onCreate();
    }

    public static DemoApp getInstance() {
        return instance;
    }

}

并且在您的清单中

<application
        android:name=".demo.DemoApp"

Answer 2

我只是错过了在 onReceivedMethod

之前在 class 中构建构造函数

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);


    }

并在应用程序中传递上下文 class

  @Override
public void onCreate() {
    super.onCreate();
    mInstance = this;


    OneSignal.startInit(this)
            .setNotificationOpenedHandler(new ExampleNotificationOpenedHandler(this))
            .init();

}

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