Static PhotoLibrary in Ionic2/angularJs2 cannot be called, ionic2angularjs2

Static PhotoLibrary in Ionic2/angularJs2 cannot be called, ionic2angularjs2
PhotoLibrary call error: No provider for PhotoLibrary;

Photolibrary is used when calling photo album files. There are always some inexplicable errors. I was overwhelmed by this pitfall in March. Now I can write it down to make it easy to check (I don't know if Ionic2 is changing now ), pitfall process:

Follow the official website example:

1. Add a plug-in:

Run cmd in the project directory:

ionic plugin add cordova-plugin-photo-library --variable PHOTO_LIBRARY_USAGE_DESCRIPTION="To choose photos"

2. Add the following to the ts file:

import { PhotoLibrary } from '@ionic-native/photo-library';constructor(private photoLibrary: PhotoLibrary) { }　　this.photoLibrary.requestAuthorization().then(() => {　　　　this.photoLibrary.getLibrary().subscribe({ next: library => {　　　　library.forEach(function(libraryItem) {　　　　　　console.log(libraryItem.id); // ID of the photo　　　　　　　//........　　}); },error: err => {}, complete: () => { console.log("could not get photos"); } }); }).catch(err => console.log("permissions weren't granted"));

Okay, this operation will show No provider for PhotoLibrary;

I checked it for a long time --------- and finally found this ghost;

In PhotoLibrary. java, I saw some static internal classes (I didn't know much about java-this is probably the meaning ):

public static XXX{}

Static classes in java cannot use inheritance (using the this and super keywords );

So do this in the. ts file -------->

import { PhotoLibrary } from '@ionic-native/photo-library';

Constructor () {// 1. No PhotoLibrary is injected into the constructor.
　　
}

TheFunction () {// 2. use it directly -- this PhotoLibrary is not required. requestAuthorization (). then () => {PhotoLibrary. getLibrary (). subscribe ({next: library =>{ library. forEach (function (libraryItem) {console. log (libraryItem. id); // ID of the photo //........});}, error: err =>{}, complete: () =>{ console. log ("cocould not get photos ");}});}). catch (err => console. log ("permissions weren't granted "));}

IonViewDidLoad (){
// 3. Call the Method
This. theFunction ();

}

-------------- The call is successful -------------------

Conclusion: If you encounter a similar static class, you can refer to this method.