如何以編程方式重命名SD卡中的音頻文件？

Question

這是我的代碼，用於在列表視圖中顯示所有音樂文件名，在這里，我將所有文件放在數組列表中，然后在列表視圖中顯示，方法是使用contextmenu對listitems執行“重命名”，但是這些更改不會影響實際的文件在SD卡中，建議我如何執行此操作，我嘗試過這樣的文件操作。

path = "/sdcard/";
    if (getIntent().hasExtra("path")) {
        path = getIntent().getStringExtra("path");
    }
    setTitle(path);
    // Read all files sorted into the values-array
    values = new ArrayList();
    File dir = new File(path);
    if (!dir.canRead()) {
        setTitle(getTitle() + " (inaccessible)");
    }
    final String[] list = dir.list();
    if (list != null) {
        for (String file : list) {
            if (file.contains(".3gp")) {
                values.add(file);
            }
        }
    }
    Collections.sort(values);
    // Put the data into the list
    adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_2,
            android.R.id.text1, values);
    setListAdapter(adapter);
    registerForContextMenu(myList);
}

final int CONTEXT_MENU_DELETE = 1;
final int CONTEXT_MENU_RENAME = 2;

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenu.ContextMenuInfo menuInfo) {
    menu.add(Menu.NONE, CONTEXT_MENU_DELETE, Menu.NONE, "silmek");
    menu.add(Menu.NONE, CONTEXT_MENU_RENAME, Menu.NONE, "adını değiştirmek");
}

@Override
public boolean onContextItemSelected(MenuItem item) {

    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item
            .getMenuInfo();
    Long id = myList.getAdapter().getItemId(info.position);
    final int number_of_item_in_listview = Integer.valueOf(id.intValue());
    final int context_menu_number = item.getItemId();

    switch (item.getItemId()) {

這是我如何使用contextmenu的listview語法重命名文件的方式

case CONTEXT_MENU_RENAME:

        AlertDialog.Builder alert = new AlertDialog.Builder(this);
        alert.setTitle("öğeyi yeniden adlandırmak");
        alert.setMessage("Seçili öğe için yeni bir isim girin");

        final EditText input = new EditText(this);
        alert.setView(input);

        alert.setPositiveButton("tamam",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                            int whichButton) {
                        String value = input.getText().toString();
                        values.set(number_of_item_in_listview, value
                                + ".3gp");
                        adapter.notifyDataSetChanged();
                        /*
                         * File sdcard =
                         * Environment.getExternalStorageDirectory(); File
                         * from = new File(sdcard,"from.txt"); File to = new
                         * File(sdcard,"to.txt"); from.renameTo(to);
                         */
                        File f = new File(path + filename);
                        if (f != null && f.exists()) {
                            File from = new File(f, f.getName());
                            File to = new File(f, value);
                            from.renameTo(to);
                        }

                    }
                });

        alert.setNegativeButton("iptal",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                            int whichButton) {
                    }
                });
        alert.show();
        return (true);
    }
    return (super.onOptionsItemSelected(item));

Answer 1

我建議使用File.renameTo（）而不是運行mv命令，因為我可以肯定不支持后者。

您是否已授予您的應用程序寫入SD卡的權限？

您可以通過將以下內容添加到AndroidManifest.xml中來實現 ：

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

如果添加權限后它不起作用，則在嘗試重命名文件時（使用adb命令或在Eclipse中的logcat視圖中）檢查設備日志中是否存在錯誤。

訪問SD卡時，您不應該對路徑進行硬編碼，而應使用Environment.getExternalStorageDirectory()方法來獲取目錄。

以下代碼對我有用：

File sdcard = Environment.getExternalStorageDirectory();
File from = new File(sdcard,"from.txt");
File to = new File(sdcard,"to.txt");
from.renameTo(to);