Android Studio中加载文件 [英] Load file in Android Studio

问题描述

我曾尝试解决这里建议：
装载Android Studio中一个简单的文本文件
等等。

I have tried the solution suggested here: Load a simple text file in Android Studio among others.

我需要将文件从活动类的外部加载，和值在不同的其他类使用。

I need to load the files from outside of an activity class, and the values be used in various other classes.

（旁注我不一定要拥有资产文件夹中的文件，他们可以在任何地方，只要我能以某种方式加载它们）。

(Sidenote I don't necessarily have to have the files in the assets folder, they can be anywhere, as long as I could somehow load them).

基本上，它告诉我要检查一个名为app.iml文件中有这样一行：

Basically, it tells me to check a file named "app.iml" to have this line:

option name="ASSETS_FOLDER_RELATIVE_PATH" value="/src/main/assets"

它呢。

在此之后，将文件添加到资产目录。

After that, add the files to the "assets" directory.

我然后尝试将文件加载有：

I then try to load the file with:

File file = new File("IDs.txt");

和

Scanner in = new Scanner(file);

但我得到一个文件未发现异常。

But I get a File Not Found exception.

无论身在何处，我把这些文件，我不能够加载它们。
有什么建议？

No matter where I put the files, I am not able to load them. Any suggestions?

推荐答案

答复制与文件夹的应用程序更新

Answer updated with copying file to app folder

您不能从资产打开的文件与文件f =新的文件。你应该打开的资产是这样的：

You cant open file from assets with File f = new File. You should open assets like this:

File ids = new File(getExternalFilesDir("txt") + File.separator + "IDs.txt");
InputStream is = null;
    if (!ids.exists()) {
        AssetManager manager = getAssets();
        try {
            is = manager.open("IDs.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }

        if (is != null)
        try{
            OutputStream outputStream = new FileOutputStream(ids);
            byte buffer[] = new byte[1024];
            int length = 0;

            while ((length = is.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
            }

            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    try {
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

现在你可以设置文件或FILE_PATH你等级：

Now you can set file or file_path to you class:

File ids = new File(getExternalFilesDir("txt") + File.separator + "IDs.txt");

要得到一个完整的路径中使用 ids.getAbsolutePath（）;

To get a full path use ids.getAbsolutePath();

这篇关于Android Studio中加载文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！