java - OneSignal customKey 获取错误 : missing return statement report

Question

我使用codeEditor进行 appybuilder 扩展。我尝试获取应用程序从 OneSignal 获取推送通知时获得的 customkey 值。这是我尝试制作的完整代码:

import android.content.Context;
import android.util.Log;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.runtime.*;
import com.google.appinventor.components.annotations.DesignerComponent;
import com.google.appinventor.components.annotations.DesignerProperty;
import com.google.appinventor.components.annotations.PropertyCategory;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.annotations.SimpleProperty;
import com.google.appinventor.components.annotations.UsesLibraries;
import com.google.appinventor.components.annotations.UsesPermissions;
import com.onesignal.OSNotification;
import com.onesignal.OSNotificationAction.ActionType;
import com.onesignal.OSNotificationOpenResult;
import com.onesignal.OSPermissionSubscriptionState;
import com.onesignal.OneSignal;
import com.onesignal.OneSignal.LOG_LEVEL;
import com.onesignal.OneSignal.NotificationOpenedHandler;
import com.onesignal.OneSignal.NotificationReceivedHandler;
import com.onesignal.OneSignal.OSInFocusDisplayOption;
import org.json.JSONObject;

 @DesignerComponent(version = 1,  description = "This Extension was created with the AppyBuilder Code Editor.<br>" + 
               "Create your own here:<br><a href='https://editor.appybuilder.com' target='_blank'>https://editor.appybuilder.com</a><br>",
    category = ComponentCategory.EXTENSION,
    nonVisible = true,   iconName = "http://appyBuilder.com/extensions/icons/extension.png")
@SimpleObject(external = true)
public class OneSignalPlus extends AndroidNonvisibleComponent {
private ComponentContainer container;
private boolean soundEnabled = true;
private boolean subscriptionEnabled = true;
private boolean vibrateEnabled = true;

private class ExampleNotificationReceivedHandler implements NotificationReceivedHandler {
    private ExampleNotificationReceivedHandler() {
    }

    public void notificationReceived(OSNotification notification) {
        JSONObject data = notification.payload.additionalData;
        String notificationID = notification.payload.notificationID;
        String title = notification.payload.title;
        String body = notification.payload.body;
        String smallIcon = notification.payload.smallIcon;
        String largeIcon = notification.payload.largeIcon;
        String bigPicture = notification.payload.bigPicture;
        String smallIconAccentColor = notification.payload.smallIconAccentColor;
        String sound = notification.payload.sound;
        String ledColor = notification.payload.ledColor;
        int lockScreenVisibility = notification.payload.lockScreenVisibility;
        String groupKey = notification.payload.groupKey;
        String groupMessage = notification.payload.groupMessage;
        String fromProjectNumber = notification.payload.fromProjectNumber;
        String rawPayload = notification.payload.rawPayload;
        Log.d("OneSignalPush", "NotificationID received: " + notificationID);
        if (data != null) {
            String customKey = data.optString("customkey", null);
            if (customKey != null) {
                Log.d("OneSignalPush", "customkey set with value: " + customKey);
            }
        }
    }
}

class NotificationOpenHandler implements NotificationOpenedHandler {
    NotificationOpenHandler() {
    }

    public void notificationOpened(OSNotificationOpenResult osNotificationOpenResult) {
        ActionType actionType = osNotificationOpenResult.action.type;
        JSONObject data = osNotificationOpenResult.notification.payload.additionalData;
        Log.d("OneSignalPush", "NotificationID received: " + data);
        if (data != null) {
            String customKey = data.optString("customkey", null);
            if (customKey != null) {
                Log.i("OneSignalExample", "customkey set with value: " + customKey);
            } else {
                Log.i("OneSignalExample", "No data");
            }
        }
    }
}

public OneSignalPlus(ComponentContainer container) {
    super(container.$form());
    this.container = container;
    OneSignal.setLogLevel(LOG_LEVEL.DEBUG, LOG_LEVEL.NONE);
    OneSignal.startInit(container.$context()).autoPromptLocation(false).setNotificationReceivedHandler(new ExampleNotificationReceivedHandler()).inFocusDisplaying(OSInFocusDisplayOption.Notification).init();
}

/**
* Get Custom Key
*/
@SimpleProperty(category = PropertyCategory.BEHAVIOR, description = "Get custom Key. If ther is no customkey it will return '-1'.")
public final String GetCustomKey(OSNotificationOpenResult osNotificationOpenResult) {
    try {
        ActionType actionType = osNotificationOpenResult.action.type;
        JSONObject data = osNotificationOpenResult.notification.payload.additionalData;
        Log.d("OneSignalPush", "NotificationID received: " + data);
        if (data != null) {
            String customKey = data.optString("customkey", null);
            if (customKey != null) {
                return customKey;
            } else {
                return "-1";
            }
        }
    } catch (NullPointerException e) {
        return false;
    }
}

/**
* Showing Log
*/
@SimpleProperty(description = "If you want to enable the log then set it to true.")
public final void EnableLog(boolean z) {
    PushNotifications pushNotifications = this;
    if (z) {
        LOG_LEVEL log_level = LOG_LEVEL.DEBUG;
        OneSignal.setLogLevel(log_level, log_level);
        return;
    }
    OneSignal.setLogLevel(LOG_LEVEL.DEBUG, LOG_LEVEL.NONE);
}

@SimpleProperty(category = PropertyCategory.BEHAVIOR, description = "Get the subscription Status")
public final boolean GetSubscriptionStatus() {
    try {
        return OneSignal.getPermissionSubscriptionState().getSubscriptionStatus().getSubscribed();
    } catch (NullPointerException e) {
        return false;
    }
}

}

但是编译时的代码给出了错误报告“缺少返回语句”。您可以尝试在此处构建此代码 codeEditor

编辑:我尝试在 if 之后添加 return 语句，如下所示

public final String GetCustomKey(OSNotificationOpenResult osNotificationOpenResult) {
    ActionType actionType = osNotificationOpenResult.action.type;
    JSONObject data = osNotificationOpenResult.notification.payload.additionalData;
    String customKey;
    if (data != null) {
        customKey = data.optString("customkey", null);
        if (customKey != null) {
            return customKey;
        } else {
            return "-1";
        }
    }
        return "-1";
}

或

public final String GetCustomKey(OSNotificationOpenResult osNotificationOpenResult) {
    ActionType actionType = osNotificationOpenResult.action.type;
    JSONObject data = osNotificationOpenResult.notification.payload.additionalData;
    String customKey;
    if (data != null) {
        customKey = data.optString("customkey", null);
        if (customKey != null) {
            return customKey;
        } 
    }
        return "-1";
}

但它给了我更多警告和错误报告

你能告诉我代码中有什么错误或错误吗

Answer 1

您需要从内部 if 语句中删除 return "-1"; 。

public final String GetCustomKey() {
    if (data != null) {
        customKey = data.optString("customkey", null);
        if (customKey != null) {
            return customKey;
        }
    }

    return "-1";
}

为了获得奖励积分，您可以稍微清理一下方法，例如

public final String GetCustomKey(OSNotificationOpenResult osNotificationOpenResult) {
    ActionType actionType = osNotificationOpenResult.action.type;
    JSONObject data = osNotificationOpenResult.notification.payload.additionalData;

    return data.containsKey("customkey") ? data.get("customkey").toString() : "-1";
}