如何以编程方式移动，复制和删除SD上的文件和目录？
我想以编程方式移动，复制和删除SD卡上的文件和目录。 我已经做了Googlesearch，但找不到任何有用的东西。
使用标准的Java I / O。 使用Environment.getExternalStorageDirectory()获取外部存储器的根目录（在某些设备上，它是SD卡）。
在清单中设置正确的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
下面是一个函数，将以编程方式移动您的文件
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()); } }
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);
移动文件的function：
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(); } }
删除
public static void deleteRecursive(File fileOrDirectory) { if (fileOrDirectory.isDirectory()) for (File child : fileOrDirectory.listFiles()) deleteRecursive(child); fileOrDirectory.delete(); }
检查以上function的链接。
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(); } }
移动
移动是没有什么只是复制文件夹的一个位置，然后删除文件夹它
performance
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
File from = new File(Environment.getExternalStorageDirectory().getAbsolutePath().getAbsolutePath()+"/kaic1/imagem.jpg"); File to = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/kaic2/imagem.jpg"); from.renameTo(to);
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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：这是如何删除根文件夹中的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
如果你正在使用番石榴，你可以使用Files.move（source，dest）
/** * 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()); } }
使用Square的Okio复制文件：
BufferedSink bufferedSink = Okio.buffer(Okio.sink(destinationFile)); bufferedSink.writeAll(Okio.source(sourceFile)); bufferedSink.close();
Xamarin Android
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; } }
获取内部和外部SD卡path的path很简单。
为此，我们只需要使用reflection方法，而不需要生根或签名的应用程序。 在清单中添加以下权限。
uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
码：
final Class<?> surfaceControlClass = Class.forName("android.os.storage.StorageManager"); Method method1 = surfaceControlClass.getMethod("getVolumePaths") method1.setAccessible(true); final Object object = context.getSystemService(Context.STORAGE_SERVICE); String[] volumes = method1.invoke(object)
