Question

我对这一切都不熟悉所以请耐心等待。我试图按照http://docs.phonegap.com/en/2.6.0/cordova_camera_camera.md.html#cameraOptions示例使用相机api做我的第一个phonegap应用程序。

我让它工作，但当我离开页面然后返回时，图像消失了。如何在本地保存它以便在我打开页面时，使用此应用程序拍摄的所有图像仍然存在？

我认为这会涉及带有图片网址的websql？你知道那里的任何教程吗？

我希望我能正确解释这一点。

我的示例基本上是来自Phonegap网站的直接副本：

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <title></title>
<!-- Extra Codiqa features -->
  <link rel="stylesheet" href="codiqa.ext.css">
  <link href="css/themes/default/main_plain.css" rel="stylesheet" type="text/css">
  <link href="css/themes/curatio.min.css" rel="stylesheet" type="text/css">
  <link href="css/themes/default/jquery.mobile.structure-1.3.2.min.css" rel="stylesheet" type="text/css">
  <!--<link href="css/themes/default/jquery.mobile-1.3.2.min_plain.css" rel="stylesheet" type="text/css">-->

  <!-- jQuery and jQuery Mobile -->
  <script src="js/jquery.js"></script>
  <script src="js/jquery.mobile-1.3.2.min.js"></script>

    <script type="text/javascript" charset="utf-8" src="cordova-2.4.0.js"></script>
    <script type="text/javascript" charset="utf-8">

    var pictureSource;   // picture source
    var destinationType; // sets the format of returned value

    // Wait for device API libraries to load
    //
    document.addEventListener("deviceready",onDeviceReady,false);

    // device APIs are available
    //
    function onDeviceReady() {
        pictureSource=navigator.camera.PictureSourceType;
        destinationType=navigator.camera.DestinationType;
    }

    // Called when a photo is successfully retrieved
    //
    function onPhotoDataSuccess(imageData) {
      // Uncomment to view the base64-encoded image data
      // console.log(imageData);

      // Get image handle
      //
      var smallImage = document.getElementById('smallImage');

      // Unhide image elements
      //
      smallImage.style.display = 'block';

      // Show the captured photo
      // The in-line CSS rules are used to resize the image
      //
      smallImage.src = "data:image/jpeg;base64," + imageData;
    }

    // Called when a photo is successfully retrieved
    //
    function onPhotoURISuccess(imageURI) {
      // Uncomment to view the image file URI
       console.log(imageURI);

      // Get image handle
      //
      var largeImage = document.getElementById('largeImage');

      // Unhide image elements
      //
      largeImage.style.display = 'block';

      // Show the captured photo
      // The in-line CSS rules are used to resize the image
      //
      largeImage.src = imageURI;
    }

    // A button will call this function
    //
    function capturePhoto() {
      // Take picture using device camera and retrieve image as base64-encoded string
      navigator.camera.getPicture(onPhotoDataSuccess, onFail, { 
      quality: 50,
      destinationType: destinationType.DATA_URL, 
      sourceType : Camera.PictureSourceType.CAMERA,
      allowEdit : true,
      encodingType: Camera.EncodingType.JPEG,
      targetWidth: 300,
      targetHeight: 380,
      popoverOptions: CameraPopoverOptions,
      saveToPhotoAlbum: true });
    }

    // A button will call this function
    //
    function capturePhotoEdit() {
      // Take picture using device camera, allow edit, and retrieve image as base64-encoded string
      navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true,
        destinationType: destinationType.DATA_URL, saveToPhotoAlbum: true });
    }

    // A button will call this function
    //
    function getPhoto(source) {
      // Retrieve image file location from specified source
      navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
        destinationType: destinationType.FILE_URI,
        sourceType: source, saveToPhotoAlbum: true  });
    }

    // Called if something bad happens.
    //
    function onFail(message) {
      alert('Failed because: ' + message);
    }

    </script>
  </head>
  <body>


<div data-role="page" id="page1">
    <div data-theme="c" data-role="header">
        <!--<h3>
            Curatio
        </h3>-->
        <div data-role="navbar" data-iconpos="top">
            <ul>
                <li>
                    <a href="usermenu.html" rel="external" data-transition="fade" data-theme="" data-icon="edit"
                    class="ui-btn-active ui-state-persist">
                        Menu
                    </a>
                </li>
                <li>
                    <a href="#page1" data-transition="fade" data-theme="" data-icon="search">
                        Search
                    </a>
                </li>
                <li>
                    <a href="#page1" data-transition="fade" data-theme="" data-icon="alert">
                        Reminders
                    </a>
                </li>
                <li>
                    <a href="map.html" rel="external" data-transition="fade" data-theme="" data-icon="info">
                        Contact
                    </a>
                </li>
            </ul>
        </div>
    </div>
    <div data-role="content">
        <h3>
            Diagnostic Imaging
        </h3>
    <button onclick="capturePhotoEdit();">Capture Editable Photo</button> <br>
    <button onclick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br>

    <img style="display:none;width:300px;height:400px;" id="smallImage" src="" />
    <img style="display:none;" id="largeImage" src="" />
    </div>

Answer 1

您需要通过更改destinationType：

将图像保存到文件系统

destinationType: destinationType. FILE_URI

在你onPhotoDataSuccess内，您将获得图像的路径，并可以再次加载（稍后）。

与每个页面应用程序一样，您需要存储状态。如果您离开页面，状态就会消失。

phonegap相机api商店图像

1 个答案: