phonegap入門--Cameraカメラ

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Camera カメラ phonegap入門

今日はphonegapのCameraカメラの章節入門の知識を見て、公式サイトのAppから例を見て、分析しました.
設定はホームページのAPIを見てもいいです.http://www.phonegap100.com/doc/cordova_cameracamera.mdy.萝Camera.
公式サイトのAPIを見て、関連方法と属性パラメータをまとめます.

Camera Api     
Camera         ，             。    base64    
      URI     。 
 
  ：   
1. camera.getPicture              
navigator.camera.getPicture( cameraSuccess, cameraError, [ cameraOptions ] ); 
cameraSuccess：       onSuccess     。 
cameraError：        onError    。 
cameraOptions：             
2. camera.cleanup                    
navigator.camera.cleanup( cameraSuccess, cameraError ); 
 
3.cameraOptions   ： 
 
            。 
quality :         ，   [0,100]。 
destinationType :         。 
sourceType :      。data:image/jpeg;base64, 
allowEdit :                     。(    ios  ) 
encodingType :             encodingType: Camera.EncodingType.JPEG 
targetWidth :                          
targetHeight :                          
saveToPhotoAlbum:                    
mediaType            
cameraDirection                  
 
  ： Android 。 
  allowEdit   。 
Camera.PictureSourceType.PHOTOLIBRARY
Camera.PictureSourceType.SAVEDPHOTOALBUM          。

以下はホームページ上の例をあげて、関連コードの説明はすでにとてもはっきりしています.

<!DOCTYPE html>
<html>
  <head>
    <title>Capture Photo</title>
    <script type="text/javascript" charset="utf-8" src="cordova-x.x.x.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 inline 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 inline 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 });
    }

    // 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 });
    }

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

    </script>
  </head>
  <body>
    <button onclick="capturePhoto();">Capture Photo</button> <br>
    <button onclick="capturePhotoEdit();">Capture Editable Photo</button> <br>
    <button onclick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br>
    <button onclick="getPhoto(pictureSource.SAVEDPHOTOALBUM);">From Photo Album</button><br>
    <img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
    <img style="display:none;" id="largeImage" src="" />
  </body>
</html>

上記の実例を通して、知識点を学びます.
1)関連パラメータ、特にcamera Optionsパラメータを使用します.
2)返却タイプはdestination Type:destination Type.DATA_URLの場合:successで返した関数にはbase 64でsmage.src=「data:image/jpeg;base 64」＋imageDataを復号します.
3)返却タイプはdestination Type:destination Type.FILE_URIの場合:successで返した関数の中で、largeImage.src=mageURIを使って、直接にこのfile gauをあげます.url経路でいいです
4)htmlでブロックレベルの要素を設定します.smage.style.display='block'

javascriptオブジェクトと関数(方法)の違いと連絡