how to delete item from listview and refresh that - android-listview

Question

I need some help in my homework here...
I want to do a listview with itens from editText.. but I dont know how to delete and edit the item, I tryed to use ContextMenu. I will post my code, and if you think that i have to change anything, tell me.. I'm begginer.
private Button bt;
private ListView lv;
private EditText et;
private ArrayList<String> Arraylt = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_l);
bt = (Button)findViewById(R.id.bt);
lv = (ListView)findViewById(R.id.lv);
et = (EditText)findViewById(R.id.et);
lv.setOnCreateContextMenuListener(this);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view,
int posicao, long id) {
Object o = lv.getItemAtPosition(posicao);
et.setText(String.valueOf(o));
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addadicionar();
}
});
}
public void addadicionar() {
Arraylt.add(et.getText().toString());
lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Arraylt));
et.setText("");
}

Answer 1

hey this is my note pad code it will help you .. have a look
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
if (v.getId()==R.id.listView1)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
}
}
#Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.edit:
// edit stuff here
return true;
case R.id.delete:
ArrayAdapter <String> adapter=new ArrayAdapter<String>(menu.this,android.R.layout.simple_list_item_1,data);
Cursor cursor2=mydb1.rawQuery("SELECT * FROM notes;", null);
data.remove(info);
lv.setAdapter(adapter);
cursor2.moveToPosition(info.position);
int id= cursor2.getInt(cursor2.getColumnIndex("id"));
mydb1.delete("notes", "id=?", new String[] {Integer.toString(id)});
list(view); // this will refresh my list by calling my display list method here
return true;
default:
return super.onContextItemSelected(item);
}

Answer 2

try to remove the item from listItems(List), then call adapter.notifyDataSetChanged();

Answer 3

try this code :
// note : you need to create xml file in res/menu folder which conatain deleter and editer item
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
if (v.getId()==R.id.listView1)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
}
}
#Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.Deletar:
// edit stuff here
return true;
case R.id.editar:
ArrayAdapter <String> adapter=new ArrayAdapter<String>(menu.this,android.R.layout.simple_list_item_1,data);
data.remove(info);
lv.setAdapter(adapter);
list(view); // this will refresh my list by calling my display //list method here
return true;
default:
return super.onContextItemSelected(item);
}

Answer 4

Yes, I win!.. now, I can edit and delete the item from listview...
private Button bt;
private ListView lv;
private EditText et;
private ArrayList<String> Arraylt = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_l);
bt = (Button)findViewById(R.id.bt);
lv = (ListView)findViewById(R.id.lv);
et = (EditText)findViewById(R.id.et);
lv.setOnCreateContextMenuListener(this);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view, int posicao, long id) {
Object o = lv.getItemAtPosition(posicao);
et.setText(String.valueOf(o));
bt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addadicionar();
}
});
}
public void addadicionar() {
Arraylt.add(et.getText().toString());
lv.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, Arraylt));
et.setText("");
}
sorry for the bad indent..