¿Cómo mover, copiar y eliminar archivos y directorios en SD mediante programación?

Question 1

Quiero mover, copiar y eliminar archivos y directorios en la tarjeta SD mediante programación. Hice una búsqueda en Google pero no pude encontrar nada útil.

Question 2

Utilice E / S estándar de Java . Úselo Environment.getExternalStorageDirectory()para acceder a la raíz del almacenamiento externo (que, en algunos dispositivos, es una tarjeta SD).

Question 3

establecer los permisos correctos en el manifiesto

     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

a continuación se muestra una función que moverá su archivo mediante programación

private void moveFile(String inputPath, String inputFile, String outputPath) {

    InputStream in = null;
    OutputStream out = null;
    try {

        //create output directory if it doesn't exist
        File dir = new File (outputPath); 
        if (!dir.exists())
        {
            dir.mkdirs();
        }


        in = new FileInputStream(inputPath + inputFile);        
        out = new FileOutputStream(outputPath + inputFile);

        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
        in.close();
        in = null;

            // write the output file
            out.flush();
        out.close();
        out = null;

        // delete the original file
        new File(inputPath + inputFile).delete();  


    } 

         catch (FileNotFoundException fnfe1) {
        Log.e("tag", fnfe1.getMessage());
    }
          catch (Exception e) {
        Log.e("tag", e.getMessage());
    }

}

Para eliminar el uso del archivo

private void deleteFile(String inputPath, String inputFile) {
    try {
        // delete the original file
        new File(inputPath + inputFile).delete();  
    }
    catch (Exception e) {
        Log.e("tag", e.getMessage());
    }
}

Copiar

private void copyFile(String inputPath, String inputFile, String outputPath) {

    InputStream in = null;
    OutputStream out = null;
    try {

        //create output directory if it doesn't exist
        File dir = new File (outputPath); 
        if (!dir.exists())
        {
            dir.mkdirs();
        }


        in = new FileInputStream(inputPath + inputFile);        
        out = new FileOutputStream(outputPath + inputFile);

        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
        in.close();
        in = null;

            // write the output file (You have now copied the file)
            out.flush();
        out.close();
        out = null;        

    }  catch (FileNotFoundException fnfe1) {
        Log.e("tag", fnfe1.getMessage());
    }
            catch (Exception e) {
        Log.e("tag", e.getMessage());
    }

}

Question 4

Mover archivo:

File from = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic1/imagem.jpg");
File to = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic2/imagem.jpg");
from.renameTo(to);

Question 5

Función para mover archivos:

private void moveFile(File file, File dir) throws IOException {
    File newFile = new File(dir, file.getName());
    FileChannel outputChannel = null;
    FileChannel inputChannel = null;
    try {
        outputChannel = new FileOutputStream(newFile).getChannel();
        inputChannel = new FileInputStream(file).getChannel();
        inputChannel.transferTo(0, inputChannel.size(), outputChannel);
        inputChannel.close();
        file.delete();
    } finally {
        if (inputChannel != null) inputChannel.close();
        if (outputChannel != null) outputChannel.close();
    }

}

Question 6

Eliminar

public static void deleteRecursive(File fileOrDirectory) {

 if (fileOrDirectory.isDirectory())
    for (File child : fileOrDirectory.listFiles())
        deleteRecursive(child);

    fileOrDirectory.delete();

    }

Consulte este enlace para ver la función anterior.

Copiar

public static void copyDirectoryOneLocationToAnotherLocation(File sourceLocation, File targetLocation)
    throws IOException {

if (sourceLocation.isDirectory()) {
    if (!targetLocation.exists()) {
        targetLocation.mkdir();
    }

    String[] children = sourceLocation.list();
    for (int i = 0; i < sourceLocation.listFiles().length; i++) {

        copyDirectoryOneLocationToAnotherLocation(new File(sourceLocation, children[i]),
                new File(targetLocation, children[i]));
    }
} else {

    InputStream in = new FileInputStream(sourceLocation);

    OutputStream out = new FileOutputStream(targetLocation);

    // Copy the bits from instream to outstream
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    in.close();
    out.close();
}

}

Moverse

mover no es nada, simplemente copie la carpeta de una ubicación a otra y luego elimine la carpeta que es

manifiesto

     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Question 7

Permisos:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Obtener la carpeta raíz de la tarjeta SD:
```
Environment.getExternalStorageDirectory()
```

Eliminar archivo: este es un ejemplo de cómo eliminar todas las carpetas vacías en una carpeta raíz:

public static void deleteEmptyFolder(File rootFolder){
    if (!rootFolder.isDirectory()) return;

    File[] childFiles = rootFolder.listFiles();
    if (childFiles==null) return;
    if (childFiles.length == 0){
        rootFolder.delete();
    } else {
        for (File childFile : childFiles){
            deleteEmptyFolder(childFile);
        }
    }
}

Copiar archivo:

public static void copyFile(File src, File dst) throws IOException {
    FileInputStream var2 = new FileInputStream(src);
    FileOutputStream var3 = new FileOutputStream(dst);
    byte[] var4 = new byte[1024];

    int var5;
    while((var5 = var2.read(var4)) > 0) {
        var3.write(var4, 0, var5);
    }

    var2.close();
    var3.close();
}

Mover archivo = copiar + eliminar archivo fuente

Question 8

File from = new File(Environment.getExternalStorageDirectory().getAbsolutePath().getAbsolutePath()+"/kaic1/imagem.jpg");
File to = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic2/imagem.jpg");
from.renameTo(to);

Question 9

Copie el archivo usando Okio de Square :

BufferedSink bufferedSink = Okio.buffer(Okio.sink(destinationFile));
bufferedSink.writeAll(Okio.source(sourceFile));
bufferedSink.close();

Question 10

/**
     * Copy the local DB file of an application to the root of external storage directory
     * @param context the Context of application
     * @param dbName The name of the DB
     */
    private void copyDbToExternalStorage(Context context , String dbName){

        try {
            File name = context.getDatabasePath(dbName);
            File sdcardFile = new File(Environment.getExternalStorageDirectory() , "test.db");//The name of output file
            sdcardFile.createNewFile();
            InputStream inputStream = null;
            OutputStream outputStream = null;
            inputStream = new FileInputStream(name);
            outputStream = new FileOutputStream(sdcardFile);
            byte[] buffer = new byte[1024];
            int read;
            while ((read = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, read);
            }
            inputStream.close();
            outputStream.flush();
            outputStream.close();
        }
        catch (Exception e) {
            Log.e("Exception" , e.toString());
        }
    }

Question 11

Si está usando Guava, puede usar Files.move (desde, hasta)

Question 12

Android de Xamarin

public static bool MoveFile(string CurrentFilePath, string NewFilePath)
{
    try
    {
        using (var f = new File(CurrentFilePath))
        using (var i = new FileInputStream(f))
        using (var o = new FileOutputStream(NewFilePath))
        {
            i.Channel.TransferTo(0, i.Channel.Size(), o.Channel);
            f.Delete();
        }

        return true;
    }
    catch { return false; }
}

public static bool CopyFile(string CurrentFilePath, string NewFilePath)
{
    try
    {
        using (var i = new FileInputStream(CurrentFilePath))
        using (var o = new FileOutputStream(NewFilePath))
            i.Channel.TransferTo(0, i.Channel.Size(), o.Channel);

        return true;
    }
    catch { return false; }
}

public static bool DeleteFile(string FilePath)
{
    try
    {
        using (var file = new File(FilePath))
            file.Delete();

        return true;
    }
    catch { return false; }
}

Question 13

Para mover un archivo, se puede usar esta api, pero necesita atleat 26 como nivel de api -

mover archivo

Pero si desea mover el directorio, no hay soporte, por lo que se puede usar este código nativo

    import org.apache.commons.io.FileUtils;

    import java.io.IOException;
    import java.io.File;

    public class FileModule {

    public void moveDirectory(String src, String des) {
    File srcDir = new File(src);
    File destDir = new File(des);
     try {
        FileUtils.moveDirectory(srcDir,destDir);
    } catch (Exception e) {
      Log.e("Exception" , e.toString());
      }
    }

    public void deleteDirectory(String dir) {
      File delDir = new File(dir);
      try {
        FileUtils.deleteDirectory(delDir);
       } catch (IOException e) {
      Log.e("Exception" , e.toString());
      }
     }
    }

Question 14

Mover archivo usando kotlin. La aplicación debe tener permiso para escribir un archivo en el directorio de destino.

@Throws(FileNotFoundException::class, IOError::class)
private fun moveTo(source: File, dest: File, destDirectory: File? = null) {

    if (destDirectory?.exists() == false) {
        destDirectory.mkdir()
    }

    val fis = FileInputStream(source)
    val bufferLength = 1024
    val buffer = ByteArray(bufferLength)
    val fos = FileOutputStream(dest)
    val bos = BufferedOutputStream(fos, bufferLength)
    var read = fis.read(buffer, 0, read)
    while (read != -1) {
        bos.write(buffer, 0, read)
        read = fis.read(buffer) // if read value is -1, it escapes loop.
    }
    fis.close()
    bos.flush()
    bos.close()

    if (!source.delete()) {
        HLog.w(TAG, klass, "failed to delete ${source.name}")
    }
}

Question 15

Mover archivo o carpeta:

public static void moveFile(File srcFileOrDirectory, File desFileOrDirectory) throws IOException {
    File newFile = new File(desFileOrDirectory, srcFileOrDirectory.getName());
    try (FileChannel outputChannel = new FileOutputStream(newFile).getChannel(); FileChannel inputChannel = new FileInputStream(srcFileOrDirectory).getChannel()) {
        inputChannel.transferTo(0, inputChannel.size(), outputChannel);
        inputChannel.close();
        deleteRecursive(srcFileOrDirectory);
    }
}

private static void deleteRecursive(File fileOrDirectory) {
    if (fileOrDirectory.isDirectory())
        for (File child : Objects.requireNonNull(fileOrDirectory.listFiles()))
            deleteRecursive(child);
    fileOrDirectory.delete();
}