我想以编程方式在SD卡上移动，复制和删除文件和目录。我已经完成了谷歌搜索，但找不到任何有用的东西。
答案 0 :(得分：143)
在清单中设置正确的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
下面是一个以编程方式移动文件的函数
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());
}
}
删除文件使用
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());
}
}
复制
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());
}
}
答案 1 :(得分：131)
移动文件：
File from = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic1/imagem.jpg");
File to = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic2/imagem.jpg");
from.renameTo(to);
答案 2 :(得分：33)
移动文件的功能：
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();
}
}
答案 3 :(得分：24)
Use standard Java I/O。使用Environment.getExternalStorageDirectory()访问外部存储的根目录（在某些设备上是SD卡）。
答案 4 :(得分：14)
删除
public static void deleteRecursive(File fileOrDirectory) {
if (fileOrDirectory.isDirectory())
for (File child : fileOrDirectory.listFiles())
deleteRecursive(child);
fileOrDirectory.delete();
}
检查上面功能的this链接。
复制
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();
}
}
<强>移动
移动不仅仅是将文件夹一个位置复制到另一个位置然后删除文件夹就可以了
<强>清单
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
答案 5 :(得分：9)
权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
获取SD卡根文件夹：
Environment.getExternalStorageDirectory()
删除文件：这是关于如何删除根文件夹中所有空文件夹的示例：
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);
}
}
}
复制文件：
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();
}
移动文件=复制+删除源文件
答案 6 :(得分：6)
File from = new File(Environment.getExternalStorageDirectory().getAbsolutePath().getAbsolutePath()+"/kaic1/imagem.jpg");
File to = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic2/imagem.jpg");
from.renameTo(to);
答案 7 :(得分：4)
使用Square的Okio
复制文件BufferedSink bufferedSink = Okio.buffer(Okio.sink(destinationFile));
bufferedSink.writeAll(Okio.source(sourceFile));
bufferedSink.close();
答案 8 :(得分：3)
如果您使用的是番石榴，则可以使用Files.move(source, dest)
答案 9 :(得分：2)
var images = document.querySelectorAll('img');
for (var i = 0; i < images.length; i++) {
var img = images[i];
img.dataset.src = img.src;
img.src = '';
}
答案 10 :(得分：1)
移动文件或文件夹：
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();
}
答案 11 :(得分：1)
在 Kotlin 中你可以使用 copyTo() 扩展函数，
sourceFile.copyTo(destFile, true)
答案 12 :(得分：0)
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; }
}
答案 13 :(得分：0)
要移动文件，可以使用此api，但需要atleat 26作为api级别 -
但是如果要移动目录，则不支持，因此可以使用此本机代码
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());
}
}
}
答案 14 :(得分：0)
使用kotlin移动文件。应用必须具有在目标目录中写入文件的权限。
@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}")
}
}