Ionic 2 Contacts本机插件在实际的Android设备中无法正常工作

Question

I installed the Contacts plugin for Ionic 2 as explained in this documentation:

https://ionicframework.com/docs/v2/native/contacts/

The reference don't give us any explanation on how to use the plugin and no example of how to find and handle errors.

In an emulator my app works just fine. It lists all the contacts. But in real device it gives me an empty error and no contact is written to the list.

Contacts.find(['phoneNumbers']).then((phone_contacts) => {
   self.contacts = {};
  // Some code
}).catch((error) => {
   alert('Contacts error: '+JSON.stringify(error));
});

The error object is empty and alert prints {} .

I installed the app by two different ways:

1- sudo ionic run android 2- copying the android-debug.apk to downloads folder and install it via package manager. I granted the requested permissions.

These two lines are in my Manifest.xml

<uses-sdk android:minSdkVersion="16" android:targetSdkVersion="24" />
<uses-permission android:name="android.permission.READ_CONTACTS" />

Anyone got a clue on how I can debug it? Or what could be this error?

@edit

It's a Android 4.4.2, KitKat

@edit 2

I put the code in my home.ts , in constructor, in the ready event.

platform.ready().then(() => {

});

Answer 1

I have a similar error, in the console.log show this message:

EXCEPTION: Uncaught (in promise): TypeError: navigator.contacts is undefined Contacts

This is my code:

import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar, Splashscreen } from 'ionic-native';
import { Contacts } from 'ionic-native';
import { HomePage } from '../pages/home/home';


@Component({
  templateUrl: 'app.html'
})
export class MyApp {
  rootPage = HomePage;

  constructor(platform: Platform) {
    platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
      Splashscreen.hide();

    Contacts.find(['displayName','name','nickname'], {filter:''})
      .then(
        cont=>{
          console.log(cont[0]);
          alert(JSON.stringify(cont[0]));
        })      
    });
  }
}