Question

为什么会这样：

myFile1 = "myReadme.txt";

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);

function gotFS(fileSystem) {
    fileSystem.root.getFile(myFile1, {create: true, exclusive: false}, gotFileEntry, fail);
}

function gotFileEntry(fileEntry) {
    alert("good");                      
}

function fail(error) {
    alert("Error");
}

这不起作用？

myFile2 = cordova.file.externalDataDirectory + "myReadme.txt";

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);

function gotFS(fileSystem) {
    fileSystem.root.getFile(myFile2, {create: true, exclusive: false}, gotFileEntry, fail);
}

function gotFileEntry(fileEntry) {
    alert("good");                      
}

function fail(error) {
    alert("Error");
}

我们不能为Android使用cordova.file.dataDirectory或cordova.file.externalRootDirectory或externalDataDirectory吗？

谢谢

Answer 1

我会尝试回答这个问题（但我确定我们可以做得更好吗？）

首先，当我将设备插入计算机时，树路径就是这样：

MyFile1.txt
所有MyApplication
- MYFILES
- MyCache
应用
DCIM
媒体
影
的音乐
的Android
- 数据
  - 数据（我认为当你没有扎根时我无法访问？）
  - com.MyDomainName.MyAppName
    - 缓存
    - 文件

然后，

遵循此官方Cordova文件：http://plugins.cordova.io/#/package/org.apache.cordova.file ，我的第一个愿望是用＆＃34; cordova.file.dataDirectory＆＃34;存储我的文件和数据。或＆＃34; cordova.file.externalDataDirectory＆＃34;还是别的......？
当您执行console.log(cordova.file.dataDirectory)时，您获得file:///data/data/com.MyDomainName.MyAppName/files/ =＆gt;这样，当您没有root时，就无法访问当你获得console.log(cordova.file.externalDataDirectory)时，你获得了 file:///storage/emulated/0/

当你做那件事

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);
function gotFS(fileSystem) { console.log(fileSystem.root) ...

你可以在这个对象中看到：nativeURL：＆＃34; file：/// storage / emulated / 0 /＆＃34; ......所以，它和＃34; externalDataDirectory＆＃34;相同。我想我们不能使用＆＃34; dataDirectory＆＃34; ...

无论如何，我不知道这是否是最好的做法，但在这里你是我的解决方案：

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFSWin, getDirectoryFail);

function onFSWin(fileSystem) {
    fileSystem.root.getDirectory("myFolder", {create: true, exclusive: false}, getDirectorySuccess, getDirectoryFail);
}

function getDirectorySuccess(parent) {
    console.log("New Folder or Folder already exists: " + parent.fullPath);
}

function getDirectoryFail(error) {
    console.log("Unable to create new directory: " + error.code);
}

// Second, we gonna check or create a new file in a specific folder
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFSWin2, onFSFail2);

function onFSWin2(fileSystem) {
    fileSystem.root.getFile("myFolder/myFile1.txt", {create: true, exclusive: false}, gotFileEntry, onFSFail2);
}

function gotFileEntry(fileEntry) {
    console.log("New file: " + fileEntry.fullPath);
    fileEntry.createWriter(gotFileWriter, onFSFail2);
}

function gotFileWriter(writer) {

writer.onwriteend = function(evt) {
   console.log("contents of file now 'some sample text'");

   writer.truncate(11);

   writer.onwriteend = function(evt) {
       console.log("contents of file now 'some sample'");

       writer.seek(4);
       writer.write(" different text");

       writer.onwriteend = function(evt){
           console.log("contents of file now 'some different text'");
       }
   };
};
writer.write("some sample text");
}

function onFSFail2(error) {
console.log(error.code);
}

Answer 2

您可以使用resolveLocalFileSystemURL来使用cordova.file.*属性：

window.resolveLocalFileSystemURL(cordova.file.externalDataDirectory, function (dirEntry) {
    dirEntry.getFile("myFile1.txt", {
        create: true,
        exclusive: false
    }, function (fileEntry) {
        // fileEntry.createWriter
    }, onError);
});

Cordova Phonegap文件插件FileWriter cordova.file

2 个答案: