Java 键入Darray作为Cordova插件参数
我正在为Cordova 3.3开发一个插件 在我的javascript部分,我下载了一个pdf文件,该文件存储为uInt8ArrayJava 键入Darray作为Cordova插件参数,java,javascript,cordova,sencha-touch,typed-arrays,Java,Javascript,Cordova,Sencha Touch,Typed Arrays,我正在为Cordova 3.3开发一个插件 在我的javascript部分,我下载了一个pdf文件,该文件存储为uInt8Array download: function ( ) { var xhr = new XMLHttpRequest(); xhr.open('GET', 'url/to/pdf', true); xhr.responseType = 'arraybuffer'; xhr.setRequestHeader('A
download: function ( ) {
var xhr = new XMLHttpRequest();
xhr.open('GET', 'url/to/pdf', true);
xhr.responseType = 'arraybuffer';
xhr.setRequestHeader('Accept', 'application/pdf');
xhr.onload = function(e) {
var uInt8Array = new Uint8Array(this.response);
window.plugins.filedownloader.saveFile(
uInt8Array,
"Downloads",
function ( response ) {
console.log("success");
},
function ( response ) {
console.log("failure");
}
);
};
xhr.send();
},
我将uInt8Array提交给我的cordova插件的save方法。
我的插件的javascript部分如下所示:
var exec = require('cordova/exec');
function FileDownloader() {
};
FileDownloader.prototype = {
login: function ( loginUrl, params, username, password, successCallback, failureCallback ) {
exec( successCallback, failureCallback, "FileDownloader", "doLogin", [ loginUrl, params, username, password ] );
},
getHtmlPage: function ( url, successCallback, failureCallback ) {
exec( successCallback, failureCallback, "FileDownloader", "getHtmlPage", [ url ] );
},
downloadAndSaveFile: function ( url, saveFolder, successCallback, failureCallback ) {
exec( successCallback, failureCallback, "FileDownloader", "downloadAndSaveFile", [ url, saveFolder ] );
},
saveFile: function ( data, saveFolder, successCallback, failureCallback ) {
exec( successCallback, failureCallback, "FileDownloader", "saveFile", [ data, saveFolder ] );
}
};
FileDownloader.install = function () {
if (!window.plugins) {
window.plugins = {}
}
window.plugins.filedownloader = new FileDownloader();
return window.plugins.filedownloader;
};
cordova.addConstructor(FileDownloader.install);
java部分中的save方法如下所示:
public PluginResult execute(JSONArray args) {
PluginResult result = new PluginResult(PluginResult.Status.OK, "blub");
log("saveFile");
try{
JSONObject dataValues = args.getJSONObject(0);
} catch (JSONException e) {
e.printStackTrace();
}
return result;
}
我现在的问题是,typedArray不再是数组了。这是一个JSONObject。uInt8Array的索引现在是字符串,不再排序。此外,至少还有一个新的密钥“byteBuffer”
在将typedArray交给插件的java部分时,是否有一种方法将其视为JSONArray,或者是否有一种不同的方法来处理此问题?有一种更好的方法 因为我使用的是Sencha Touch,所以我不需要自己创建xhr对象。 事实上,就像问题中所做的那样,它会导致ios内存问题,并且应用程序会因较大的文件而崩溃
Ext.Ajax.request()
downloadFile: function ( record ) {
var me = this;
Ext.Ajax.request({
url: record.get("url"),
method: 'GET',
success: function ( response ) {
me.onFileDownloaded( response, record );
},
failure: function ( response ) {
},
scope: this,
responseType: "arraybuffer",
timeout: 300000
});
此请求的响应为arraybuffer,可按如下方式使用:
window.plugins.filemanager.saveUint8ByteArrayToFile(
"Download",
record.get("title"),
response.responseBytes,
response.responseBytes.byteLength,
function ( filePath ) {
me.onFileSaved( filePath );
},
function ( message ) {
me.onFileSaveError( message );
}
);
在Android上,response.responseBytes
将转换为base64编码字符串。在iOS上,它将转换为NSData