PreferencesActivity.java 文件源码

@Override
public void onFolderSelection(@NonNull FolderChooserDialog folderChooserDialog, @NonNull File folder) {
    try {
        MaintenanceFragment f = (MaintenanceFragment) getSupportFragmentManager()
                .findFragmentById(R.id.container);

        f.exportPersonalKey(this,
            new FileOutputStream(new File(folder, PersonalKeyPack.KEYPACK_FILENAME)));
    }
    catch (FileNotFoundException e) {
        Log.e(PreferencesFragment.TAG, "error exporting keys", e);
        Toast.makeText(this,
            R.string.err_keypair_export_write,
            Toast.LENGTH_LONG).show();
    }
}