我已经做了一个程序,列出所有的文件和文件夹(f&f)位于SD卡上。如果我触摸其中一个列表项(如果它是一个文件夹),则列表将显示faf位于该文件夹上。
这是源代码
public class FileList extends ListActivity
{
private File file;
private List<String> myList;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
myList = new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
file = new File( root_sd + "/external_sd" ) ;
File list[] = file.listFiles();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
File temp_file = new File( file, myList.get( position ) );
if( !temp_file.isFile())
{
file = new File( file, myList.get( position ));
File list[] = file.listFiles();
myList.clear();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
Toast.makeText(getApplicationContext(), file.toString(), Toast.LENGTH_LONG).show();
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
}
@Override
public boolean dispatchKeyEvent(KeyEvent event)
{
if( KeyEvent.KEYCODE_BACK == event.getKeyCode())
{
String parent = file.getParent().toString();
file = new File( parent ) ;
File list[] = file.listFiles();
myList.clear();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
Toast.makeText(getApplicationContext(), parent, Toast.LENGTH_LONG).show();
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
return true;
}
}
现在我有两个问题
中的JFileChooser那样显示所有f&f。
发布于 2011-12-27 05:34:26
似乎当你回击dispatchKeyEvent()时会收到两次KeyEvent KEYCODE_BACK,所以我建议你这样做:
public class FileList extends ListActivity
{
private File file;
private List<String> myList;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
myList = new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
file = new File( root_sd + "/external_sd" ) ;
File list[] = file.listFiles();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
File temp_file = new File( file, myList.get( position ) );
if( !temp_file.isFile())
{
file = new File( file, myList.get( position ));
File list[] = file.listFiles();
myList.clear();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
Toast.makeText(getApplicationContext(), file.toString(), Toast.LENGTH_LONG).show();
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
}
@Override
public void onBackPressed() {
String parent = file.getParent().toString();
file = new File( parent ) ;
File list[] = file.listFiles();
myList.clear();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
Toast.makeText(getApplicationContext(), parent, Toast.LENGTH_LONG).show();
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList ));
}
发布于 2013-11-04 20:01:53
要列出外部存储器的所有文件和文件夹,最好使用
final String state = Environment.getExternalStorageState();
if ( Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state) ) { // we can read the External Storage...
getAllFilesOfDir(Environment.getExternalStorageDirectory());
}
其中getAllFilesOfDir()是递归方法:
private void getAllFilesOfDir(File directory) {
Log.d(TAG, "Directory: " + directory.getAbsolutePath() + "\n");
final File[] files = directory.listFiles();
if ( files != null ) {
for ( File file : files ) {
if ( file != null ) {
if ( file.isDirectory() ) { // it is a folder...
getAllFilesOfDir(file);
}
else { // it is a file...
Log.d(TAG, "File: " + file.getAbsolutePath() + "\n");
}
}
}
}
}
发布于 2013-09-05 17:03:24
ArrayList<File> fileList = new ArrayList<File>();
public ArrayList<File> getfile(File dir,String fileType)//pass fileType as a music , video, etc.
{
File listFile[] = dir.listFiles();
if (listFile != null && listFile.length > 0)
{
for (int i = 0; i < listFile.length; i++)
{
if (listFile[i].isDirectory())
{
getfile(listFile[i],fileType);
}
else
{
if("doc".equals(fileType))
{
if(listFile[i].getName().endsWith(".pdf") || listFile[i].getName().endsWith(".txt") ||
listFile[i].getName().endsWith(".xml") || listFile[i].getName().endsWith(".doc") ||
listFile[i].getName().endsWith(".xls") || listFile[i].getName().endsWith(".xlsx"))
{
fileList.add(listFile[i]);
}
}
else if("music".equals(fileType))
{
if(listFile[i].getName().endsWith(".mp3"))
{
fileList.add(listFile[i]);
}
}
else if("video".equals(fileType))
{
if(listFile[i].getName().endsWith(".mp4"))
{
fileList.add(listFile[i]);
}
}
else if("image".equals(fileType))
{
if(listFile[i].getName().endsWith(".png") || listFile[i].getName().endsWith(".jpg")
|| listFile[i].getName().endsWith(".jpeg") || listFile[i].getName().endsWith(".gif"))
{
fileList.add(listFile[i]);
}
}
}
}
}
return fileList;
}
https://stackoverflow.com/questions/8638293
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