NativeScript/camera/camera.android.ts

import appModule = require("application");

var REQUEST_IMAGE_CAPTURE: number = 1;
var REQUEST_SELECT_PICTURE: number = 2;

export class CameraManager {
    public takePicture(params: any, onSuccess: (imageData: any) => any, onError?: (error: any) => any) {
        var takePictureIntent = new android.content.Intent('android.media.action.IMAGE_CAPTURE');
        var androidApp = appModule.android;

        if (takePictureIntent.resolveActivity(androidApp.context.getPackageManager()) !== null) {
            androidApp.currentActivity.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }

    // options { useSavedPhotos: true }
    public pictureFromLibrary(params: any, onSuccess: (imageData: any) => any, onError?: (error: any) => any) {
        var readPictureIntent = new android.content.Intent();
        var androidApp = appModule.android;

        readPictureIntent.setType('image/*');
        readPictureIntent.setAction('android.intent.action.GET_CONTENT');

        androidApp.currentActivity.startActivityForResult(android.content.Intent.createChooser(readPictureIntent, 'Select Picture'),
            REQUEST_SELECT_PICTURE);
    }
}