帮助提神清单,notifyDataSetChanged() [英] Help refreshing list with notifyDataSetChanged()
问题描述
我工作的那是我的应用程序的一部分,一个简单的文件浏览器,我增加了一些code删除文件,但是我需要的文件列表后的一个项目已经被删除,刷新。这是code我有这么远,我说在我呼吁评论fileList.notifyDataSetChanged();
但它不为我工作所以基本上我究竟做错了什么?感谢您的帮助。
私人无效GETDIR(字符串dirPath)
{ 项目=新的ArrayList<串GT;();
路径=新的ArrayList<串GT;(); 文件f =新的文件(dirPath);
文件[] =文件f.listFiles(); 如果(!dirPath.equals(根))
{ item.add(根);
path.add(根); item.add(../);
path.add(f.getParent()); } 的for(int i = 0; I< files.length;我++)
{
文件file =文件[I]
path.add(file.getPath());
如果(file.isDirectory())
item.add(file.getName()+/);
其他
item.add(file.getName());
} ArrayAdapter<串GT;的fileList =新ArrayAdapter<串GT;(这一点,R.layout.row,项目);
setListAdapter(的fileList);
} @覆盖
保护无效onListItemClick(ListView中升,视图V,最终诠释的位置,长的id){ 最终文件的文件=新的文件(path.get(位置)); 如果(file.isDirectory())
{
如果(file.canRead())
GETDIR(path.get(位置));
其他
{
新AlertDialog.Builder(本)
.setIcon(R.drawable.boot)
.setTitle([+ file.getName()+]文件夹无法读取!)
.setPositiveButton(OK,
新DialogInterface.OnClickListener(){ @覆盖
公共无效的onClick(DialogInterface对话,诠释它){
}
})。显示();
}
}
其他
{
最终的CharSequence [] =项目{信息,重命名,删除}; AlertDialog.Builder建设者=新AlertDialog.Builder(本);
builder.setTitle(为选项+ file.getName());
builder.setItems(项目,新DialogInterface.OnClickListener(){
公共无效的onClick(DialogInterface对话,诠释项){
如果(项目== 0)
{
AlertDialog.Builder建设者=新AlertDialog.Builder(Installed.this);
SimpleDateFormat的SDF =新的SimpleDateFormat(MM / DD / YYYY HH:MM:SS);
builder.setIcon(R.drawable.info)
.setTitle(file.getName()+信息)
.setMessage(路径:+ file.getPath()+\\ n \\ n大小:+(双)file.length()/ 1024 +MBS+\\ n \\ n修改:+ sdf.format(文件。上一次更改()))
.setCancelable(假)
.setPositiveButton(OK,新DialogInterface.OnClickListener(){
公共无效的onClick(DialogInterface对话,诠释的id){
dialog.cancel();
}
})。显示(); }
否则如果(项目== 1)
{
// TODO添加重命名code在这里
Toast.makeText(Installed.this,重命名,Toast.LENGTH_SHORT).show();
}
否则如果(项目== 2)
{
AlertDialog.Builder建设者=新AlertDialog.Builder(Installed.this);
builder.setMessage(你确定要删除+ file.getName()+?)
.setCancelable(假)
.setPositiveButton(是,新DialogInterface.OnClickListener(){
公共无效的onClick(DialogInterface对话,诠释的id){
文件F1 =新的文件(file.getPath());
布尔成功= f1.delete();
如果(!成功){
Toast.makeText(Installed.this,无法删除+ file.getName(),Toast.LENGTH_SHORT).show();
}其他{
Toast.makeText(Installed.this,file.getName()+删除!,Toast.LENGTH_SHORT).show();
}
//这是我尝试刷新列表
fileList.notifyDataSetChanged();
}
})
.setNegativeButton(否,新DialogInterface.OnClickListener(){
公共无效的onClick(DialogInterface对话,诠释的id){
dialog.cancel();
}
})。显示();
}
}
})。显示();
}
}
在之后删除项目
,请尝试使用 fileList.remove(theItemYouDeleted)
。这应该删除项目
从适配器
。换句话说,你必须从你的数据和从你的适配器
删除。
我希望这有助于
Hi i'm working on a simple file browser that is a part of my app and I have added some code to delete files however I need the list of files to refresh after one item has been deleted. This is the code I have so far and I added a comment in where I call on fileList.notifyDataSetChanged();
however it doesn't work for me so basically what am i doing wrong here? Thank you for any help
private void getDir(String dirPath)
{
item = new ArrayList<String>();
path = new ArrayList<String>();
File f = new File(dirPath);
File[] files = f.listFiles();
if(!dirPath.equals(root))
{
item.add(root);
path.add(root);
item.add("../");
path.add(f.getParent());
}
for(int i=0; i < files.length; i++)
{
File file = files[i];
path.add(file.getPath());
if(file.isDirectory())
item.add(file.getName() + "/");
else
item.add(file.getName());
}
ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, R.layout.row, item);
setListAdapter(fileList);
}
@Override
protected void onListItemClick(ListView l, View v, final int position, long id) {
final File file = new File(path.get(position));
if (file.isDirectory())
{
if(file.canRead())
getDir(path.get(position));
else
{
new AlertDialog.Builder(this)
.setIcon(R.drawable.boot)
.setTitle("[" + file.getName() + "] folder can't be read!")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
}
else
{
final CharSequence[] items = {"Info", "Rename", "Delete"};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Options for " + file.getName());
builder.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
if (item == 0)
{
AlertDialog.Builder builder = new AlertDialog.Builder(Installed.this);
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
builder.setIcon(R.drawable.info)
.setTitle(file.getName() + " info")
.setMessage("Path: " + file.getPath() + "\n\nSize: " + (double)file.length()/1024 + " mbs" + "\n\nModified: " + sdf.format(file.lastModified()))
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
}).show();
}
else if (item == 1)
{
//TODO Add Rename code here
Toast.makeText(Installed.this, "Rename", Toast.LENGTH_SHORT).show();
}
else if (item == 2)
{
AlertDialog.Builder builder = new AlertDialog.Builder(Installed.this);
builder.setMessage("Are you sure you want to delete " + file.getName() +"?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
File f1 = new File(file.getPath());
boolean success = f1.delete();
if (!success){
Toast.makeText(Installed.this, "Could not delete " + file.getName(), Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(Installed.this, file.getName() + " deleted!", Toast.LENGTH_SHORT).show();
}
//This is where I try to refresh the list
fileList.notifyDataSetChanged();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
}).show();
}
}
}).show();
}
}
After you delete the item
, try using fileList.remove(theItemYouDeleted)
. That should remove the item
from the Adapter
. In other words you have to delete it from your data and from your adapter
.
I hope this helps
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