將文件從資產復制到Android中的SD卡

Question

我正在使用此代碼將資產文件夾中的文件處理到sdcard中，但出現錯誤，並且文件副本的卷為3KB。 我花了大約3個小時來解決問題，但是我不能！ 有什么問題和解決方法

該代碼用於復制

FileOperations.copyFromAsset(MainActivity.this,"database_tafsir_persian_azim","quran/data/database_tafsir_persian_azim");

---

public static void copyFromAsset(Context context,String src,String dst) throws IOException {  


   try{
        AssetManager asset=context.getAssets();
        InputStream in = asset.open(src);
        OutputStream out = new FileOutputStream(new File(dst));//ERROR IS FROM THIS LINE
        // Transfer bytes from in to out
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
            Log.i("Copying", "please wait...");
        }
        in.close();   
        out.close();
        out.flush();
       }catch(Exception e){
           e.printStackTrace();
       }
   }

日志貓：

09-18 16:05:20.096: W/System.err(4219): java.io.FileNotFoundException: /quran/data/database_tafsir_persian_azim: open failed: ENOENT (No such file or directory)
09-18 16:05:20.165: D/TextLayoutCache(4219): Using debug level: 0 - Debug Enabled: 0
09-18 16:05:20.175: W/System.err(4219):     at libcore.io.IoBridge.open(IoBridge.java:419)
09-18 16:05:20.175: W/System.err(4219):     at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
09-18 16:05:20.175: W/System.err(4219):     at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
09-18 16:05:20.175: W/System.err(4219):     at ir.aiga.apps.quran.classes.FileOperations.copyFromAsset(FileOperations.java:112)
09-18 16:05:20.175: W/System.err(4219):     at ir.aiga.apps.quran.MainActivity$ProgressHorizantol.doInBackground(MainActivity.java:732)
09-18 16:05:20.175: W/System.err(4219):     at ir.aiga.apps.quran.MainActivity$ProgressHorizantol.doInBackground(MainActivity.java:1)
09-18 16:05:20.175: W/System.err(4219):     at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-18 16:05:20.175: W/System.err(4219):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-18 16:05:20.175: W/System.err(4219):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-18 16:05:20.186: W/System.err(4219):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-18 16:05:20.186: W/System.err(4219):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-18 16:05:20.186: W/System.err(4219):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-18 16:05:20.186: W/System.err(4219):     at java.lang.Thread.run(Thread.java:856)
09-18 16:05:20.186: W/System.err(4219): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
09-18 16:05:20.186: W/System.err(4219):     at libcore.io.Posix.open(Native Method)
09-18 16:05:20.186: W/System.err(4219):     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
09-18 16:05:20.186: W/System.err(4219):     at libcore.io.IoBridge.open(IoBridge.java:403)

Answer 1

嘗試先創建父目錄，也許它們不存在：

File destination = new File(dst);
File parent = new File(destination.getParent());
parent.mkdirs();
OutputStream out = new FileOutputStream(destination);

還要確保dst是您外部目錄（sd卡）的正確路徑。 您應該通過以下方式獲得該路徑：

Environment.getExternalStorageDirectory().getPath() + "/your_file";