qr code - Ionic cordova-plugin-qrscanner has no camera preview -


i run simple demo use cordova-plugin-qrscanner, can scan qrcode no camera preview.

qrscannerdemo on github

related code blow:

import { component } '@angular/core';  import { navcontroller } 'ionic-angular';      import { androidpermissions } '@ionic-native/android-permissions';  import { qrscanner, qrscannerstatus } '@ionic-native/qr-scanner';    @component({    selector: 'page-home',    templateurl: 'home.html'  })  export class homepage {      constructor(public navctrl: navcontroller,                public androidpermissions: androidpermissions,                public qrscanner: qrscanner) {      }      qrscanner() {        // optionally request permission      this.qrscanner.prepare()        .then((status: qrscannerstatus) => {          if (status.authorized) {            // camera permission granted            alert('authorized');              // start scanning            let scansub = this.qrscanner.scan().subscribe((text: string) => {              console.log('scanned something', text);              alert(text);              this.qrscanner.hide(); // hide camera preview              scansub.unsubscribe(); // stop scanning            });              this.qrscanner.resumepreview();              // show camera preview            this.qrscanner.show();              // wait user scan something, observable callback called            } else if (status.denied) {            alert('denied');            // camera permission permanently denied            // must use qrscanner.opensettings() method guide user settings page            // can grant permission there          } else {            // permission denied, not permanently. can ask permission again @ later time.            alert('else');          }        })        .catch((e: any) => {          alert('error is' + e);        });      }    }
<ion-header>    <ion-navbar transparent>      <ion-title>        ionic blank      </ion-title>    </ion-navbar>  </ion-header>      <ion-content padding style="background: none transparent;">    <button ion-button (click)="qrscanner()">qrscanner</button>  </ion-content>

run ionic project on android click button nothing happened , no camera preview show.

i test project again , find can scan qrcode , result test, no camera preview.

i search problem, says should set body , elements transparent. try not work.

android. nothing appears on screen. #35

anyone help?

in top level index.html:

<ion-app style="background: none transparent;"></ion-app>

in camera display page html file:

<ion-content style="background: none transparent;">

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