如何在nativescript插件中获取Activity？

我在开发nativescript时遇到了一些麻烦.我不知道如何在nativescript插件中获取Activity？

在android中:

import android.app.Activity;
import com.alipay.sdk.app.PayTask;
public Alipay(Activity activity) {
    this.activity = activity;
    PayTask alipay = new PayTask(activity);
    String result = alipay.pay(payInfo);
}

当我在nativescript中开发插件时.我写下这段代码:

var application = require("application");
var context = application.android.context;
//var context = application.android.foregroundActivity;
 
module.exports = {
    startpay: function(orderInfo) {

        var payTask = new com.alipay.sdk.app.PayTask(context);
        return payTask.payV2(orderInfo,true);
    }
};

它可以使用com.alipay.sdk.app.PayTask().但背景是错误的.我试过

var context = application.android.context;

和

var context = application.android.foregroundActivity;

但是,当App运行时也有异常:

An uncaught Exception occurred on "main" thread. com.tns.NativeScriptException:  Calling js method onClick failed

Error: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
    com.alipay.sdk.sys.b.a(SourceFile:46)
    com.alipay.sdk.app.PayTask.(SourceFile:57)
    com.tns.Runtime.callJSMethodNative(Native Method)
    com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1022)
    com.tns.Runtime.callJSMethodImpl(Runtime.java:907)
    com.tns.Runtime.callJSMethod(Runtime.java:895)
    com.tns.Runtime.callJSMethod(Runtime.java:879)
    com.tns.Runtime.callJSMethod(Runtime.java:871)
    com.tns.gen.android.view.View_OnClickListener.onClick(android.view.View$OnClickListener.java)
    android.view.View.performClick(View.java:4790)
    android.view.View$PerformClick.run(View.java:19933)
    android.os.Handler.handleCallback(Handler.java:739)
    android.os.Handler.dispatchMessage(Handler.java:95)
    android.os.Looper.loop(Looper.java:135)
    android.app.ActivityThread.main(ActivityThread.java:5569)
    java.lang.reflect.Method.invoke(Native Method)
    java.lang.reflect.Method.invoke(Method.java:372)
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:931)
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:726) File: "/data/data/com.zhengbancn.app/files/app/tns_modules/nativescript-alipay/index.js, line: 8, column: 15

pkanev.. 7

您可以使用核心模块API来检索应用程序上下文/活动,如下所述:https: //docs.nativescript.org/cookbook/application#using-the-android-application-context

import app = require("application"); var context = app.android.context;

要么

var utilsAd = require("utils/utils").ad; var context = utilsAd.getApplicationContext();

您可以使用核心模块API来检索应用程序上下文/活动,如下所述:https: //docs.nativescript.org/cookbook/application#using-the-android-application-context

import app = require("application"); var context = app.android.context;

要么

var utilsAd = require("utils/utils").ad; var context = utilsAd.getApplicationContext();