JS代码

Question

我正在做后台程序，目前在 ionic 中使用cordova's background fetch plugin。即使终止应用程序，我也想运行后台任务。它可以在iOS上运行，但documentation表示它还支持 android 。根据{{3}}的说法，为了使select 'XYZ' as 'Sync By', select '2021-10-16' as 'Sync Date', (select ID, EmailAddress, StartDate, EndDate, from table EmailAddresses for json path) EmailAddresses, (select Id, CardNumber, ValidFrom, ValidTo, CVC from table Cards for json path) Cards for json path能够正常工作，我需要编写一个Java代码，并将BackgroundFetchHeadlessTask.java文件放置在应用程序中的任何位置。创建BackgroundFetchHeadlessTask.java文件后，我仍然获得无头任务的默认实现。

我也尝试过documentation，但是当我终止我的应用程序时，它会停止后台进程。 cordova-plugin-background-mode符合我的所有要求，所以这就是为什么我现在坚持使用它。我目前将Java文件放置在：

myProjectFolder / www / src / android / BackgroundFetchHeadlessTask.java

这是我的代码：

JS代码

enableHeadless: true

Java代码

$ionicPlatform.ready(function(){
  var BackgroundFetch = window.BackgroundFetch;
  function background() {
    var fetchCallback = function() {
      console.log('[js] BackgroundFetch event received');
      BackgroundFetch.finish();
    };
    var failureCallback = function(error) {
      console.log('- BackgroundFetch failed', error);
    };
    BackgroundFetch.configure(fetchCallback, failureCallback, {
      minimumFetchInterval: 15, // <-- default is 15
      stopOnTerminate: false,
      enableHeadless: true
    });
  }
});

config.xml

package com.transistorsoft.cordova.backgroundfetch;
import android.content.Context;
import com.transistorsoft.tsbackgroundfetch.BackgroundFetch;
import android.util.Log;

public class BackgroundFetchHeadlessTask implements HeadlessTask {
    @Override
    public void onFetch(Context context) {
        Log.d(BackgroundFetch.TAG, "My BackgroundFetchHeadlessTask:  onFetch");
        // Perform your work here.
        Log.d(BackgroundFetch.TAG, "Yes, I am running");

        // Just as in Javascript callback, you must signal #finish
        BackgroundFetch.getInstance(context).finish();
    }
}

我想要得到的是：

<platform name="android">
        <edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application" xmlns:android="http://schemas.android.com/apk/res/android">
            <application android:networkSecurityConfig="@xml/network_security_config" />
        </edit-config>
        <resource-file src="resources/android/xml/network_security_config.xml" target="app/src/main/res/xml/network_security_config.xml" />
        <allow-intent href="market:*" />
        <icon density="ldpi" src="resources/android/icon/drawable-ldpi-icon.png" />
        <icon density="mdpi" src="resources/android/icon/drawable-mdpi-icon.png" />
        <icon density="hdpi" src="resources/android/icon/drawable-hdpi-icon.png" />
        <icon density="xhdpi" src="resources/android/icon/drawable-xhdpi-icon.png" />
        <icon density="xxhdpi" src="resources/android/icon/drawable-xxhdpi-icon.png" />
        <icon density="xxxhdpi" src="resources/android/icon/drawable-xxxhdpi-icon.png" />
        <splash density="land-ldpi" src="resources/android/splash/drawable-land-ldpi-screen.png" />
        <splash density="land-mdpi" src="resources/android/splash/drawable-land-mdpi-screen.png" />
        <splash density="land-hdpi" src="resources/android/splash/drawable-land-hdpi-screen.png" />
        <splash density="land-xhdpi" src="resources/android/splash/drawable-land-xhdpi-screen.png" />
        <splash density="land-xxhdpi" src="resources/android/splash/drawable-land-xxhdpi-screen.png" />
        <splash density="land-xxxhdpi" src="resources/android/splash/drawable-land-xxxhdpi-screen.png" />
        <splash density="port-ldpi" src="resources/android/splash/drawable-port-ldpi-screen.png" />
        <splash density="port-mdpi" src="resources/android/splash/drawable-port-mdpi-screen.png" />
        <splash density="port-hdpi" src="resources/android/splash/drawable-port-hdpi-screen.png" />
        <splash density="port-xhdpi" src="resources/android/splash/drawable-port-xhdpi-screen.png" />
        <splash density="port-xxhdpi" src="resources/android/splash/drawable-port-xxhdpi-screen.png" />
        <splash density="port-xxxhdpi" src="resources/android/splash/drawable-port-xxxhdpi-screen.png" />
        <resource-file src="www/src/android/BackgroundFetchHeadlessTask.java" target="src/com/transistorsoft/cordova/backgroundfetch/BackgroundFetchHeadlessTask.java" />
</platform>

我得到的是这样的：

08-31 12:13:07.722  1169  1169 D TSBackgroundFetch: - My BackgroundFetchHeadlessTask:  onFetch
08-31 12:13:07.741  1169  1169 D TSBackgroundFetch: - Yes, I am running

是否有解决此问题的方法，或者是否有替代cordova-plugin-background-fetch的其他替代方法？

Answer 1

似乎正在执行插件的默认处理。检查平台下的BackgroundFetchHeadlessTask.java是否已被覆盖。如果未覆盖，则目标路径不正确。 target =“ src / com / transistorsoft / cordova / backgroundfetch / BackgroundFetchHeadlessTask.java”

为什么'BackgroundFetchHeadlessTask.java'在ionic中不起作用？

JS代码

Java代码

config.xml

1 个答案: