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java - 访问资产文件时出现 FileNotFoundException

问题描述

我正在尝试将文件从资产文件夹复制到我的应用程序的内部文件目录，但它不断抛出 FileNotFoundException

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ava.io.FileNotFoundException: android.content.res.AssetManager@f252431/wordsdb.ser: open failed: ENOENT (No such file or directory)
2020-04-05 19:44:48.829 11247-11247/stickyapps.zabanamooz W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:496)
2020-04-05 19:44:48.829 11247-11247/stickyapps.zabanamooz W/System.err:     at java.io.FileInputStream.<init>(FileInputStream.java:159)
2020-04-05 19:44:48.829 11247-11247/stickyapps.zabanamooz W/System.err:     at stickyapps.zabanamooz.Managers.WordsManager.copy(WordsManager.java:91)
2020-04-05 19:44:48.830 11247-11247/stickyapps.zabanamooz W/System.err:     at stickyapps.zabanamooz.Managers.WordsManager.<init>(WordsManager.java:46)
2020-04-05 19:44:48.830 11247-11247/stickyapps.zabanamooz W/System.err:     at stickyapps.zabanamooz.MainActivity.onCreate(MainActivity.java:40)
2020-04-05 19:44:48.830 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.Activity.performCreate(Activity.java:7802)
2020-04-05 19:44:48.830 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.Activity.performCreate(Activity.java:7791)
2020-04-05 19:44:48.830 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
2020-04-05 19:44:48.831 11247-11247/stickyapps.zabanamooz W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:107)
2020-04-05 19:44:48.832 11247-11247/stickyapps.zabanamooz W/System.err:     at android.os.Looper.loop(Looper.java:214)
2020-04-05 19:44:48.832 11247-11247/stickyapps.zabanamooz W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7356)
2020-04-05 19:44:48.832 11247-11247/stickyapps.zabanamooz W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2020-04-05 19:44:48.832 11247-11247/stickyapps.zabanamooz W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
2020-04-05 19:44:48.833 11247-11247/stickyapps.zabanamooz W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
2020-04-05 19:44:48.836 11247-11247/stickyapps.zabanamooz W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
2020-04-05 19:44:48.836 11247-11247/stickyapps.zabanamooz W/System.err:     at libcore.io.Linux.open(Native Method)

...

我正在使用这段代码：

        File file1 = new File(context.getAssets() + "/wordsdb.ser");
        File file2 = new File(context.getFilesDir() + "/wordsdb.ser");

        try {
            copy(file1,file2);
        } catch (IOException e) {
            e.printStackTrace();
        }

复制方法：

public void copy(File src, File dst) throws IOException {
    try (InputStream in = new FileInputStream(src)) {
        try (OutputStream out = new FileOutputStream(dst)) {
            // Transfer bytes from in to out
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
        }
    }
}

我尝试重新启动android studio，重建项目，重新安装应用程序......但仍然没有运气。

标签： javaandroidfileexceptioncopy

解决方案

尝试使用资产管理器

AssetManager assetManager = getAssets();
String[] files = assetManager.list("");

这将打开一个 certian 文件：

InputStream input = assetManager.open(assetName);

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