I have a main activity with 6 buttons. Every button starts a new activity.
The program worked well but after that I changed some graphical attributes and made some changes in the theme a mistake occurred . I should press back button 3 times to return from an activity or exit from the main activity. Any suggestions?
btn_weeks.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
Intent i = new Intent(MainActivity.this, Weeks.class);
startActivity(i);
return false;
}
});
Buttons should implements View.OnClickListener and not OnTouchListener.
Related
I have a recyclerview set up in xamarin.android as per the code in this link
https://www.appliedcodelog.com/2019/08/reorder-list-items-by-drag-and-drop-in.html
My question is, how can I remember the position of these items when the app is restarted etc. When the user adds items they are inserted at adapter position 0,1,2,3 etc but when they close the app and come back in, it is not always in the same order.
The user can also rearrange by drag and drop so this seems to add even more confusion!
Currently I have the items in the recyclerview being saved by converting the list to Json and loading when the app opens again but as I said, the items aren't always in the same order as before the app was closed.
Can anyone advise the best way to do this? I have tried to add the item name and position number to a list converting to json then trying to insert the item at the saved position index but can't get it to work..
Thanks
Do you want to achieve the result like following GIF?
You can use PreferenceManager to store position of items(Before store data, I will Serialize data) in a recyclerview.
You can override OnPause() method, this method will be executed when application is background or app is killed. So we can store the position and data in this method.Here is code about ReOrderActivity
[Activity(Label = "ReOrderList")]
public class ReOrderActivity : Activity, IOnStartDragListener
{
private ItemTouchHelper _mItemTouchHelper;
public static ObservableCollection<string> ResourceList;
private RecyclerView _resourceReorderRecyclerView;
ReOrderAdapters resourceAdapter;
ISharedPreferences prefs;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.ReOrderLayout);
prefs = PreferenceManager.GetDefaultSharedPreferences(this);
GetCollection();
resourceAdapter = new ReOrderAdapters(ResourceList, this);
// Initialize the recycler view.
_resourceReorderRecyclerView = FindViewById<RecyclerView>(Resource.Id.ResourceReorderRecyclerView);
Button mDone = FindViewById<Button>(Resource.Id.mDone);
mDone.Click += MDone_Click;
_resourceReorderRecyclerView.SetLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.Vertical, false));
_resourceReorderRecyclerView.SetAdapter(resourceAdapter);
_resourceReorderRecyclerView.HasFixedSize = true;
ItemTouchHelper.Callback callback = new SimpleItemTouchHelperCallback(resourceAdapter);
_mItemTouchHelper = new ItemTouchHelper(callback);
_mItemTouchHelper.AttachToRecyclerView(_resourceReorderRecyclerView);
}
protected override void OnPause()
{
base.OnPause();
string ConvertData = JsonConvert.SerializeObject(ResourceList);
ISharedPreferencesEditor editor = prefs.Edit();
editor.PutString("ObservableCollection_ConvertData", ConvertData);
// editor.Commit(); // applies changes synchronously on older APIs
editor.Apply(); // applies changes asynchronously on newer APIs
}
private void MDone_Click(object sender, System.EventArgs e)
{
resourceAdapter.AddItem("Add item");
}
public void OnStartDrag(RecyclerView.ViewHolder viewHolder)
{
_mItemTouchHelper.StartDrag(viewHolder);
}
//Added sample data record here
public void GetCollection()
{
//ISharedPreferencesEditor editor = prefs.Edit();
//editor.PutString("ObservableCollection_ConvertData", "");
//editor.Apply();
string ConvertData = prefs.GetString("ObservableCollection_ConvertData","");
if(string.IsNullOrEmpty(ConvertData))
{
ResourceList = new ObservableCollection<string>();
ResourceList.Add("OnPause()");
ResourceList.Add("OnStart()");
ResourceList.Add("OnCreate()");
}
else
{
ResourceList= JsonConvert.DeserializeObject<ObservableCollection<string>>(ConvertData);
}
//var or= ResourceList.ToString();
}
}
}
You can download my demo
https://drive.google.com/file/d/1mQTKf3rlcIVnf2N97amrqtnrSCRk-8ZW/view?usp=sharing
I just want to be able to display a list of contacts (without even communicating to a server) just the way it is displayed on the "Contacts" native app on the phone.
I have like 1500 contacts and when I try to load the recycler view, all items at once, it lags a lot 2 - 3 seconds.
I've achieved loading more items but with a loading bar and thats not what I want.
I've already tried Threads, Executors, postOnUIThread(), handler.post() and even AsyncTask -> Override -> doOnBackground. Nothing works.
private class CustomTask extends AsyncTask<Void, Void, Void> {
int inserted;
#Override
protected Void doInBackground(Void... param) {
//Do some work
try {
lcf.getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
((BaseActivity) lcf.getActivity()).showProgressDialog();
}
});
int currentSize = contactsLoaded.size();
for (inserted = 0; inserted < lcf.getController().getContacts().size() && contactsLoaded.size() < lcf.getController().getContacts().size(); inserted++) {
contactsLoaded.add(lcf.getController().getContacts().get(currentSize + inserted));
notifyItemRangeInserted(contactsLoaded.size() - 1, inserted);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void param) {
//Print Toast or open dialog
//notifyItemRangeInserted(contactsLoaded.size() - 1, 0);
if(!lcf.getController().isSelectedAffiliated()){
lcf.disclaimerLayout.setVisibility(View.VISIBLE);
}else{
lcf.disclaimerLayout.setVisibility(View.GONE);
}
lcf.isLoading=false;
((BaseActivity) lcf.getActivity()).hideProgressDialog();
}
}
That code lives within my adapter, "lcf" is a reference to the fragment. If I use the already loaded list saved on the controller (that I get from the fragment reference) and then just call notifyDataSetChanged() it LAGS like hell. So with this CustomTask I tried to load every item and notify it one by one to a Background task hoping it would make the items pop up quickly and sequentially without interfereing with the UI thread to not freeze the screen. It doesn't work. I am out of options now. I've tried everything.
public void addListenerOnButton()
{
final Context context = this;
inquiry = (Button)findViewById(R.id.btnInquiry);
link = (Button)findViewById(R.id.btnLink);
inquiry.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(context,QuickInquiry.class);
startActivity(i);
}
});
link.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(context,PortfolioFragment.class);
startActivity(i);
}
});
}
When I click on the button which should open the fragment, I get an exception that PortfolioFragment is not mentioned in the android manifest file. PortfolioFragment is the fragment java file.
You can only use Activity with startActivity().
From Android Documentation,
A Fragment represents a behavior or a portion of user interface in an
Activity. You can combine multiple fragments in a single activity to
build a multi-pane UI and reuse a fragment in multiple activities. You
can think of a fragment as a modular section of an activity, which has
its own lifecycle, receives its own input events, and which you can
add or remove while the activity is running (sort of like a "sub
activity" that you can reuse in different activities).
Here's a detailed explanation of Fragments:
http://developer.android.com/guide/components/fragments.html
I am creating an Android activity and starting a service from this activity using the following code. Now I want to display text "Hello user" from this service to screen, meaning service should trigger this display. I could use Toast.maketext.show but the display will disappear after couple of seconds.
new Thread(new Runnable() {
#Override
public void run() {
startAdapterIntent.setAction("START_ADAPTER");
startService(startAdapterIntent);
System.out.println("Thread2: Adapter Service started.");
}
}).start();
How do I do that?
I tried to use this link:
Making changes to Main Activity UI from thread in Service
and its (probably) parent link
http://developer.android.com/reference/android/app/Service.html
section "Remote Messenger Service Sample"
While using this second link, the onServiceConnected part of ServiceConnection doesn't seem to be working? Please help. Thank you.
From within your service you should create a handler that can be triggered by a timer task, the handler should be the one directly responsible of doing the communication with the currently active UI thread..an example would be
long delay = 3000;
long period = 3000;
TimerTask mDoTask = new TimerTask() {
#Override
public void run() {
xHandler.sendMessage(Message.obtain(xHandler, SOME_OPERATION));
}
};
mT.scheduleAtFixedRate(mDoTask, delay, period);
Handler xHandler=new Handler(){
#Override
public void handleMessage(Message message){
switch (message.what){
case SOME_OPERATION:
YourMethod();// in this method you can display your text
break;
}
}
};
I've set a listener to my Pane so that it will detect mouse left and right buttons being down.
But when I hold left mouse button, then press right one, previous action seem to lose it's effect!
My code:
root.setOnMouseDragged(new EventHandler<MouseEvent>(){
#Override
public void handle(MouseEvent t) {
if(t.getButton() == MouseButton.PRIMARY) f1();
if(t.getButton() == MouseButton.SECONDARY) f2();
}
});
while holding LMB I have f1() running, but when I push RMB it seems like new event totally overwrites previous one: only f2() runs.
How can I separate this two events?
getButton() can return only one value at a time. And it's latest pressed button. If you need to detect multiple mouse down being pressed you need to use corresponding functions:
root.setOnMouseDragged(new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent t) {
if (t.isPrimaryButtonDown()) {
System.out.println("rockets armed");
}
if (t.isSecondaryButtonDown()) {
System.out.println("autoaim engaged");
}
}
});