Question

当我拍照时，我开始不断收到内存警告。我使用Cordova 3.5和相机插件进行了这些设置。

var _config;      
var pictureSource;
var destinationType; // sets the format of returned value.
var encodingType; // enconding type 0=JPG 1=PNG

/**
 * Initialize camera plugin.
 * @param {object} config - settings.
 */
function initialize(config) {
    alert("CAMERA is comming!!");
    // Wait for Cordova to connect with the device
    document.addEventListener('deviceready', onDeviceReady, false);
}

/** 
 * Cordova is ready to be used!
 * @param {object} config - settings.
 */
function onDeviceReady() {

    console.log("CAMERA is READY!!");
    pictureSource=navigator.camera.PictureSourceType;
    destinationType=navigator.camera.DestinationType;
    encodingType = navigator.camera.EncodingType;
    capturePhoto();
}

/**
 * Set camera plugin settings.
 * @param {object} config - settings.
 */
function setConfig(config) {
    _config = config;
}

/**
 * Take picture using device camera and retrieve image as base64-encoded string.
 */
function capturePhoto() {
    setConfig({ quality: 20, destinationType: destinationType.DATA_URL, encodingType: 0});
    navigator.camera.getPicture(onPhotoDataSuccess, onFail, _config);
}

/**
 * Photo is successfully retrieved.
 * @callback getPicture~onPhotoDataSuccess
 * @param {string} imageData - A base64-encoded image.
 */
function onPhotoDataSuccess(imageData) {
    //Edit photo
}

我确保质量很低，但在崩溃之前它会变慢。

感谢您的帮助！

Answer 1

最后，我通过修正照片尺寸来解决问题：

 /**
 * Take a picture and get the image as base64-encoded string.
 */
function capturePhoto() {
    setConfig({ quality: 20, targetWidth: 600, targetHeight: 600, correctOrientation: true, destinationType: destinationType.DATA_URL, encodingType: 0});
    navigator.camera.getPicture(onPhotoDataSuccess, onFail, _config);
}

Answer 2

DATA_URL将图像作为数据流返回。由于返回到程序的字符串值的大小，现代高分辨率相机简单地重载JavaScript引擎。来自我的Apache Cordova API Cookbook：

＆＃34;使用Camera.DestinationType.DATA_URL存在问题。摄像机图像包含大量数据，将图像转换为字符串并将其传递到Cordova应用程序以超出大多数设备的JavaScript引擎的限制。除非您降低图像的质量或大小，否则当您使用此选项时，您很可能会发现应用程序非常慢或崩溃。＆＃34;

建议使用FILE_URI，除非拍摄非常小的照片，否则您将永远无法使用DATA_URL。

使用Cordova相机后收到内存警告iOS

2 个答案: