When I use this code:
App.Current.MainPage = new NavigationPage(new MainPage());
I get space the blue one at the header the blue one.
When I do this code no space at the header.
public App()
{
InitializeComponent();
MainPage = new MainPage();
}
At the top of the app, i guess you want to hide the status bar.
If you want to hide the status bar of the app, you could try the following ways.
Android: Set the Fullscreen in MainActivity.
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Platform.Init(this, savedInstanceState);
this.Window.AddFlags(WindowManagerFlags.Fullscreen);
}
iOS: Add the following key-value in Info.plist.
<key>UIStatusBarHidden</key>
<true/>
<key>UIViewControllerBasedStatusBarAppearance</key>
<false/>
Related
I am creating an android application in xamarin. I am using a web view to display a website. To enter the input in the text box i have created custom keyboards, So i have to keep my app in full screen. I have manged to do that and My app is working properly.
But problem occurs when user connects the external keyboard( by OTG cable).
1. My Activity is restarting when i attach or detach the external keyboard.
I have tried the following code to prevent the activity restart
(a) I have written the following code in AndroidManifest.xml
<application android:configChanges="orientation|keyboard|keyboardHidden|screenSize" android:label="ABC" android:icon="#drawable/AppIcon"></application>
(b) I have added the attribute to the activity
[Activity (Label = "ABC",Icon = "#drawable/AppIcon", ConfigurationChanges = ConfigChanges.Keyboard|ConfigChanges.KeyboardHidden|ConfigChanges.ScreenSize,ScreenOrientation = ScreenOrientation.Landscape)]
public class HomeActivity : Activity
{}
2. Navigation bar with keyboard switching key is showing up when i type something from external keyboard
For this i have written the following code.
public static SystemUiFlags flags = (SystemUiFlags.Visible | SystemUiFlags.LayoutHideNavigation | SystemUiFlags.LayoutFullscreen | SystemUiFlags.HideNavigation |
SystemUiFlags.Fullscreen | SystemUiFlags.ImmersiveSticky);
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
//hide action bar and title bar
HideActionBarAndTitleBar(this);
//set view for activity
SetContentView(Resource.Layout.activity_layout_home);
HideNaviagtionBar(this);
Window.DecorView.SystemUiVisibilityChange += (sender, e) =>
{
Window.DecorView.SystemUiVisibility = (Android.Views.StatusBarVisibility)Global.flags;
};
}
public override void OnWindowFocusChanged(bool hasFocus)
{
base.OnWindowFocusChanged(hasFocus);
Window.DecorView.SystemUiVisibility = (Android.Views.StatusBarVisibility)Global.flags;
}
public static void HideActionBarAndTitleBar(Activity activity)
{
//Remove title bar
activity.RequestWindowFeature(WindowFeatures.NoTitle);
//Remove notification bar
activity.Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);
}
public static void HideNaviagtionBar(Activity activity)
{
View decorView = activity.Window.DecorView;
decorView.SystemUiVisibility = (Android.Views.StatusBarVisibility)flags;
decorView.SystemUiVisibilityChange += (object sender, View.SystemUiVisibilityChangeEventArgs e) =>
{
if (e.Visibility == (Android.Views.StatusBarVisibility)SystemUiFlags.Visible && SystemUiFlags.Fullscreen == SystemUiFlags.Visible)
{
decorView.SystemUiVisibility = (Android.Views.StatusBarVisibility)flags;
}
};
}
I don't know why this is happening, please help.
The Context
I have a HomeActivity that contains a NewsFragment. The NewsFragment contains a ListView to display news items in a list. I have a ViewPager that is added as a header-view to the ListView. This ViewPager appears as a header to the list and contains a DateFragment to display the date. The first time the user opens the HomeActivity, I want "TODAY" to be the date. When the user swipes the DateFragment to the left, I want the date text to show "TOMORROW". Swipe again and it should show the day after tomorrow. Similarly, when the user swipes in the other direction, I want to display "YESTERDAY", the day before yesterday etc. The ViewPager should support swiping infinitely (or a very large number) in both directions.
Here's how they are nested - http://tinypic.com/r/31623qw/8. (I don't have the reputation to post images yet, but this diagram is super useful for understanding this question).
The Problem
For simplicity, I'm displaying the index of the fragment as the date. When I first open the app, I see "Date: 0" being displayed as the date in the DateFragment. When I swipe the fragment to the left (to go to the next day), I can see the next fragment appear with "Date: 1" being displayed, but almost immediately, the fragment disappears. Once the fragment disappears, nothing reappears, and I just see an empty container. I can swipe to bring back the "Date: 0" Fragment, but I can't see any other Fragments. (I'm using the - Infinite View Pager by Antony T. - https://github.com/antonyt/InfiniteViewPager)
The Gory Details
I have a HomeActivity that contains a NewsFragment. The NewsFragment contains a ListView to display news items as a list. Here is the layout.xml for the NewsFragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
I have a ViewPager that is dynamically added as a header to this list. So inside NewsFragment, I first initialize the ListView:
#Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.home_news_fragment, container, false);
list = (ListView) view.findViewById(android.R.id.list);
emptyView = view.findViewById(android.R.id.empty);
list.setEmptyView(emptyView);
return view;
}
Next, in onActivityCreated(), I initialize and load the header for the ListView, and then load the news feed items:
#Override
public void onActivityCreated(final Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
loadHeader();
loadNewsFeed();
}
In the loadHeader() method, I then dynamically create a LinearLayout container to contain my ViewPager. I create a PagerAdapter for the ViewPager and I wrap it with an InfiniteViewPager to allow infinite swiping in both directions. I then create a ViewPager and I add it to the LinearLayout container. I then add the container as a Header View to the ListView:
private void loadHeader()
{
final LinearLayout headerContainer = new LinearLayout(getActivity());
headerContainer.setId(R.id.header_container_id);
headerContainer.setLayoutParams(new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
headerContainer.setOrientation(LinearLayout.VERTICAL);
// initialize the pager adapter for the view pager
PagerAdapter pagerAdapter = new HeaderPagerAdapter(getActivity().getSupportFragmentManager());
// Create a view pager. I use a custom implementation of a view pager I found from another Stackoverflow answer - WrapContentHeightViewPager - that allows ViewPager's layout.height to wrap content. The original ViewPager does not allow wrapping of content.
WrapContentHeightViewPager mViewPager = new WrapContentHeightViewPager(getActivity());
mViewPager.setId(R.id.view_pager_header);
mViewPager.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT));
// wrap pager to provide infinite paging with wrap-around
PagerAdapter wrappedAdapter = new InfinitePagerAdapter(pagerAdapter);
mViewPager.setAdapter(wrappedAdapter);
// Add the view pager to the header container
headerContainer.addView(mViewPager);
// add the container as a header view to the list
list.addHeaderView(headerContainer);
}
In the loadNewsFeed() method, I do an async fetch of the news feed items and populate the list by adding the items into the footer view. I won't go into the implementation details for this - outside the scope of this question.
The NewsFragment contains my pager adapter, which contains the getItem method that initializes the Fragment to be displayed by the ViewPager:
private class HeaderPagerAdapter extends FragmentPagerAdapter
{
public HeaderPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
return DateFragment.newInstance(i);
}
#Override
public int getCount() {
return Integer.MAX_VALUE;
}
}
And here is the actual Fragment to be displayed inside the ViewPager:
public class DateFragment extends Fragment
{
private int index;
TextView date;
public static final DateFragment newInstance(int index) {
DateFragment fragment = new DateFragment();
final Bundle args = new Bundle(1);
args.putInt(Constants.Extras.PAGE_INDEX, index);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
index = getArguments() != null ? getArguments().getInt(Constants.Extras.PAGE_INDEX) : 1;
}
#Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState)
{
View v = (ViewGroup) inflater.inflate(R.layout.summary_fragment, container, false);
date = (TextView) v.findViewById(R.id.tvDate);
return v;
}
#Override
public void onActivityCreated(final Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
date.setText("Date: " + index);
}
}
For now I am simply using the index to be displayed as the date. I want to replace this with the actual date. Why does the fragment disappear on swipe?
Considerations:
Is there a refresh/redraw event that gets called?
Does it have to do with extending FragmentPagerAdapter vs. FragmentStatePagerAdapter
Override destroyItem() or instantiateItem()?
Set up a onPageScrolled listener on the ViewPager and then handle the page scroll events? I tried thehayro.blogspot.com/2012/12/enable-infinite-paging-with-android.html and that causes my fragments to disappear and then appear after a while.
Is it because I am adding the ViewPager as a header to the list view? The list view scrolls up and down and the view pager left and right. I've added this to my ViewPager implementation to tell the list view to stop intercepting our touch events:
#Override
public boolean onInterceptTouchEvent(MotionEvent ev)
{
// Tell our parent to stop intercepting our events!
boolean ret = super.onInterceptTouchEvent(ev);
if (ret)
{
getParent().requestDisallowInterceptTouchEvent(true);
}
return ret;
}
I'm sorry about the length of this post. I felt this much detail might be necessary. Thoughts?
I am trying use the actionbarcompat (with the android support library) following the android developer's blog entry.
Basically, I am trying create a Fragment extending the ListFragment. I am using an ArrayAdapter for the listview. I was able to successfully integrate the actionbar compat with a search menu item and could get the search working as well.
I now want to retain the state of the fragment on orientation change as well. I haven't set the setRetainInstance(true) in my fragment. Inorder to retain the state of the search view, i tried the following:
save the text in the SearchView in onSaveInstanceState()
in onCreateView, retrieve the searchText if available
in onCreateOptionsMenu (which would be invoked on every orientation change), I am trying to set the search query to the SearchView instance mSearchView.setQuery(mSearchText, false);
There are 2 issues that I see with this approach:
the onQueryTextChange() is called twice on orientation change - once with the searchText that has been retained (because of mSearchView.setQuery(mSearchText, false);) and again, with an empty String value. This second call with the empty String value updates the list adapater to have all the items without any filtering. I am also not really sure why this is happening.
mSearchView.setQuery(mSearchText, false); isn't setting the query in the SearchView and is not visible in the UI as well (on orientation change, the search view is expanded by default and is focused without any text value though I have set the query).
Outline of my Fragment is as follows:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// create and initialize list adapter
....
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.plainlist, container, false);
if (savedInstanceState != null) {
mSearchText = savedInstanceState.getString(RetainDataKeySearchText, null);
}
return view;
}
#Override
public void onSaveInstanceState(Bundle outState) {
if (isAdded()) {
if (mSearchView != null) {
String searchText = mSearchView.getQuery().toString();
if (!TextUtils.isEmpty(searchText))
outState.putString(RetainDataKeySearchText, searchText);
}
}
super.onSaveInstanceState(outState);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.search_item_list, menu);
MenuItem searchItem = menu.findItem(R.id.menu_search);
mSearchView = (SearchView) MenuItemCompat.getActionView(searchItem);
mSearchView.setOnQueryTextListener(this);
if (!TextUtils.isEmpty(mSearchText))
mSearchView.setQuery(mSearchText, false);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onQueryTextChange(String newText) {
// Called when the action bar search text has changed.
searchItems(newText);
return true;
}
#Override
public boolean onQueryTextSubmit(String searchText) {
return true;
}
private void searchItems(String searchText) {
// filter results and update the list adapter
}
The menu xml (search_item_list) file is as follows:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:sprinklr="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/menu_search"
android:icon="#android:drawable/ic_menu_search"
android:title="#string/search"
android:orderInCategory="0"
sprinklr:showAsAction="ifRoom|collapseActionView"
sprinklr:actionViewClass="android.support.v7.widget.SearchView" />
</menu>
I would like to know if there is anything that I am missing or if there is a better alternate to retain the state of the SearchView (android.support.v7.widget.SearchView) on orientation change in a ListFragment with actionbarcompat.
As a workaround, replace your
mSearchView.setQuery(mSearchText, false);
with:
final String s = mSearchText;
mSearchView.post(new Runnable() {
#Override
public void run() {
mSearchView.setQuery(s, false);
}
});
It will set the saved string after the system has set the empty string.
I did it with AppCompatActivity rather than with Fragment. I used the equivalent solution as above but the search text wasn't visible even with the post on the search view. I added the menu item expansion before:
mSearchView.post(() -> {
searchItem.expandActionView();
mSearchView.setQuery(mSearchText, false);
mSearchView.clearFocus();
});
I really need help (am a newbie to ADT/Eclipse), I set up a back ground image by placing the image first in the res/drawable folder and then proceeded to place it in my application usind the:
android:background = "#drawable/image"
I then proceeded to change the layout to "scrollview"
The image appeared in the Graphical layout but after a while, ADT showed me an error saying:
(Where the error is at where "R" is written e.g. setContentView(R.layout.activity_main);
the error reads "R cannot be resolved to a variable"
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
I would kindly appreciate if anyone helps :D
I have view that extends ViewPart. In this view, I want to add toolbar menu.
What I know, we can add toolbar menu by using ActionContributionItem or Action, and add it to ToolBarMenu from createPartControl method in ViewPart.
But what I don't know is this: How can we disable/enable the toolbar menu programmatically?
So basically, I want to add Play, Stop, and Pause button to toolbar view. So at first, the Play button is on enabled mode, and the others are disabled. When I pressed Play button, it is disabled, and others will be enabled.
For more details, what I want to achieve is something like the following image.
In the red circle are disabled button, and in the blue circle are enabled button.
Instead of using Actions, have a look at Eclipse commands (they are the replacement for actions and function in a cleaner way): http://help.eclipse.org/indigo/topic/org.eclipse.platform.doc.isv/guide/workbench_cmd.htm
You will see in the documentation that you can enable and disable a command and all places where it's used will properly update their state automatically.
There is another approach which I found by stumbling upon on google. This approach is using ISourceProvider to provide variable state. So we can provide the state of enablement/disablement of command in that class (that implementing ISourceProvider). Here is the detail link http://eclipse-tips.com/tutorials/1-actions-vs-commands?showall=1
Try this..
1: Implement your actions. ex: PlayAction, StopAction.
Public class StartAction extends Action {
#Override
public void run() {
//actual code run here
}
#Override
public boolean isEnabled() {
//This is the initial value, Check for your respective criteria and return the appropriate value.
return false;
}
#Override
public String getText() {
return "Play";
}
}
2: Register your view part(Player view part)
Public class Playerview extends ViewPart
{
#Override
public void createPartControl(Composite parent) {
//your player UI code here.
//Listener registration. This is very important for enabling and disabling the tool bar level buttons
addListenerObject(this);
//Attach selection changed listener to the object where you want to perform the action based on the selection type. ex; viewer
viewer.addselectionchanged(new SelectionChangedListener())
}
}
//selection changed
private class SelectionChangedListener implements ISelectionChangedListener {
#Override
public void selectionChanged(SelectionChangedEvent event) {
ISelection selection = Viewer.getSelection();
if (selection != null && selection instanceof StructuredSelection) {
Object firstElement = ((StructuredSelection)selection).getFirstElement();
//here you can handle the enable or disable based on your selection. that could be your viewer selection or toolbar.
if (playaction.isEnabled()) { //once clicked on play, stop should be enabled.
stopaction.setEnabled(true); //Do required actions here.
playaction.setEnabled (false); //do
}
}
}
}
Hope this would help you.