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目录
前言
在APP中启动相册选择器或者拍照上传图片这些功能是非常常见的。对于Ionic2,我们只能通过cordova插件实现调用原生的功能。下面将简单的封装一个选择相册或拍照上传图片的ImgService服务。具体如下。
Cordova准备
下载安装所需的Cordovar插件:
Image Picker(相册选择)
ionic plugin add https://github.com/Telerik-Verified-Plugins/ImagePicker
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Camera(拍照)
ionic plugin add cordova-plugin-camera
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Transfer(上传文件)
ionic plugin add cordova-plugin-file-transfer
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ImgService服务的实现
通过显示ActionSheet组件,让用户选择上传图片的方式,如从相册选择或者拍照。具体如下:
/** * Created by admin on 2016/10/21. */import { Injectable } from "@angular/core";import { ActionSheetController } from "ionic-angular";import { Camera, ImagePicker, Transfer } from "ionic-native";import { NoticeService } from "./notice.service";@Injectable()export class ImgService { // 参考:https://github.com/driftyco/ionic-native/blob/master/src/plugins/camera.ts // 调用相机时传入的参数 private cameraOpt = { quality: 50, destinationType: 1, // Camera.DestinationType.FILE_URI, sourceType: 1, // Camera.PictureSourceType.CAMERA, encodingType: 0, // Camera.EncodingType.JPEG, mediaType: 0, // Camera.MediaType.PICTURE, allowEdit: true, correctOrientation: true }; // 调用相册时传入的参数 private imagePickerOpt = { maximumImagesCount: 1,//选择一张图片 width: 800, height: 800, quality: 80 }; //imgPath: string = ''; //图片路径 fileTransfer: Transfer; upload: any = { url: 'http://xxx/', //接收图片的url fileKey: 'image', //接收图片时的key headers: { 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' //不加入 发生错误!! }, params: {}, //需要额外上传的参数 success: (data) => {}, //图片上传成功后的回调 error: (err) => {}, //图片上传失败后的回调 listen: () => {} //监听上传过程 }; constructor(private actionSheetCtrl: ActionSheetController, private noticeSer: NoticeService) { } showPicActionSheet() { this.useASComponent(); } // 使用ionic中的ActionSheet组件 private useASComponent() { let actionSheet = this.actionSheetCtrl.create({ title: '选择', buttons: [ { text: '拍照', handler: () => { this.startCamera(); } }, { text: '从手机相册选择', handler: () => { this.openImgPicker(); } }, { text: '取消', role: 'cancel', handler: () => { } } ] }); actionSheet.present(); } // 使用原生的ActionSheet组件 /*private useNativeAS() { let buttonLabels = ['拍照', '从手机相册选择']; ActionSheet.show({ 'title': '选择', 'buttonLabels': buttonLabels, 'addCancelButtonWithLabel': 'Cancel', //'addDestructiveButtonWithLabel' : 'Delete' }).then((buttonIndex: number) => { if(buttonIndex == 1) { this.startCamera(); } else if(buttonIndex == 2) { this.openImgPicker(); } }); }*/ // 启动拍照功能 private startCamera() { Camera.getPicture(this.cameraOpt).then((imageData) => { this.uploadImg(imageData); }, (err) => { this.noticeSer.showToast('ERROR:' + err); //错误:无法使用拍照功能! }); } // 打开手机相册 private openImgPicker() { let temp = ''; ImagePicker.getPictures(this.imagePickerOpt) .then((results) => { for (var i = 0; i < results.length; i++) { temp = results[i]; } this.uploadImg(temp); }, (err) => { this.noticeSer.showToast('ERROR:' + err); //错误:无法从手机相册中选择图片! }); /*let str = '{"status":1,"msg":"提示:图片上传成功!","data":"http:\/\/192.168.1.20\/image\/580af6bcc4d40580af6bcc4d45.jpg"}'; let res = JSON.parse(str); this.upload.success(res);*/ } // 上传图片 private uploadImg(path: string) { if(!path) { return; } this.fileTransfer = new Transfer(); let options: any; options = { fileKey: this.upload.fileKey, headers: this.upload.headers, params: this.upload.params }; this.fileTransfer.upload(path, this.upload.url, options) .then((data) => { if(this.upload.success) { this.upload.success(JSON.parse(data.response)); } }, (err) => { if(this.upload.error) { this.upload.error(err); } else { this.noticeSer.showToast('错误:上传失败!'); } }); } // 停止上传 stopUpload() { if(this.fileTransfer) { this.fileTransfer.abort(); } }}
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注:这里自定义了一个NoticeService服务,主要用于统一toast的显示。如下:
/** * Created by Administrator on 2016/10/10 0010. */import { Injectable } from '@angular/core';import { ToastController } from 'ionic-angular';@Injectable()export class NoticeService { static TOAST_POS_BOTTOM: string = 'bottom'; static TOAST_POS_MIDDLE: string = 'middle'; constructor(private toastCtrl: ToastController) { } // 显示 toast提示 showToast(message: string, position: string = NoticeService.TOAST_POS_BOTTOM) { let toast = this.toastCtrl.create({ message: message, duration: 1500, position: position }); toast.present(); return toast; } /*showNoticeByToast(code: Number, msg: string) { let m = ''; if(code == 1) { m = '提示:' + msg + '!'; } else { m = '错误' + code + ':' + msg + '!'; } return this.showToast(m); }*/ showNoticeByToast(code: Number, msg: string) { let m = ''; if(msg && msg.length > 0) { if(msg.charAt(msg.length - 1) == '!' || msg.charAt(msg.length - 1) == '!') { msg = msg.substr(0, msg.length - 1); } } if(code == 1) { m = '提示:' + msg + '!'; } else { m = '错误' + code + ':' + msg + '!'; } return this.showToast(m); }}
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ImgService服务的使用
使用ImgService服务,需要在对应的Page页面中的构造方法中进行注入。如:
constructor(private notiSer: NotiService, private imgSer: ImgService) { }
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使用ImgService服务,需要我们先进行初始化,如:
// 初始化上传图片的服务 private initImgSer() { this.imgSer.upload.url = ''; // 上传图片的url,如果同默认配置的url一致,那无须再设置 this.imgSer.upload.success = (data) => { //上传成功后的回调处理 }; this.imgSer.upload.error = (err) => { this.noticeSer.showToast('错误:头像上传失败!'); }; }
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正式使用:
this.initImgSer();this.imgSer.showPicActionSheet();
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示例效果
Android显示效果如下:
相册选择器的汉化
在打开相册选择器的过程中,我们可能会发现其相册选择器的“取消”或“确定”按钮是英文显示的。但是BOSS可能会要求我们修改为中文,这时又要伤一下脑筋咯。
解决(针对Anroid来说,ios应该也是一样滴):在项目的plugins目录下找到com.synconset.imagepicker文件夹,进入src/android/Library/res目录,创建values-zh文件夹,在values-zh文件夹中创建multiimagechooser_strings_zh.xml
文件,内容如下:
<?xml version="1.0" encoding="utf-8"?><resources> <string name="multi_app_name">图片选择器</string> <string name="free_version_label">免费版本 - 剩余图片: %d</string> <string name="error_database">打开相册出现错误.</string> <string name="requesting_thumbnails">请稍后...</string> <string name="processing_images_header">图像选择</string> <string name="processing_images_message">这可能是一个短暂的瞬间的时间.</string> <string name="maximum_selection_count_error_header">Auswahllimit erreicht</string> <string name="maximum_selection_count_error_message">Sie können maximal %d Bilder auf einmal auswählen.</string> <string name="discard">取消</string> <string name="done">确定</string></resources>
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修改plugins/com.synconset.imagepicker/plugin.xml文件,找到android区域,增加如下语句:
<source-file src="src/android/Library/res/values-zh/multiimagechooser_strings_zh.xml" target-dir="res/values-zh"/>
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删除项目platforms文件夹下的android平台,重新添加平台打包运行即可。