java.io.FileNotFoundException 当我试图读入我的 Android Studio 项目中的二进制文件时

Question

正如标题所说，我想读入一个已经创建的二进制文件“mac_address_name”。该项目在连接到 android 工作室 IDE.

的物理设备上运行

这是我的项目树，你可以看到 classes 和二进制文件：

PROJECT TREE.PNG

这是 ProcessorManager class 中的代码，您可以在评论中看到我尝试过的其他方法...

private String readFromFile() {

    String ret = "";

    try {

        /*InputStream inputStream = main_activity.getApplicationContext().openFileInput("mac_address_name");*/
        /*InputStream inputStream = new FileInputStream(new File("../mac_address_name"));*/
        /*InputStream inputStream = main_activity.openFileInput("mac_address_name");*/
        InputStream inputStream = new FileInputStream(new File("mac_address_name"));
        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append("\n").append(receiveString);
            }

            inputStream.close();
            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e("login activity", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("login activity", "Can not read file: " + e.toString());
    }

    return ret;
}

输出：

E/login activity: File not found: java.io.FileNotFoundException: mac_address_name: open failed: ENOENT (No such file or directory)

Answer 1

为此，您应该使用资产。将文件移动到项目中的 src/main/assets 文件夹。然后使用AssetsManager获取文件内容：

AssetManager am = context.getAssets();
InputStream is = am.open("mac_address_name");

更多信息请访问： https://nbasercode.com/net/android-read-text-file-from-assets-folder-in-android-studio/ https://developer.android.com/reference/android/content/res/AssetManager

java.io.FileNotFoundException 当我试图读入我的 Android Studio 项目中的二进制文件时

java.io.FileNotFoundException when I'm trying to read into a binary file in my Android Studio project

java

android

filenotfoundexception

file-not-found

android-studio