I am trying to set background for my List view . I have taken a image from the drawable and set it as background to the layout file then it is giving the result as following screen shot
and when i just remove the background am getting the thing which i required but no background.
and screen shot is
Is there is any other Syntax to set background for ListView.
And my Code for layout is
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:text="#+id/TextView01" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="#+id/label"
android:textColor="#FF0000"
android:textSize="30px"></TextView>
</LinearLayout>
And my java code and that is
String[] names = new String[] { "India", "Malaysia" };
// Use your own layout and point the adapter to the UI elements which
// contains the label
this.setListAdapter(new ArrayAdapter<String>(this, R.layout.screen3,
R.id.label, names));
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
// Get the item that was clicked
Object o = this.getListAdapter().getItem(position);
String keyword = o.toString();
if(keyword.equals("India"))
{
Intent ima1=new Intent(screen3.this,new21.class);
startActivity(ima1);
}
else
{
Intent ima2=new Intent(screen3.this,new22.class);
startActivity(ima2);
}
Toast.makeText(this, "You selected: " + keyword, Toast.LENGTH_LONG)
.show();
}
And lastly i need is I want the background image with proper listview showing one listitem after another. Thanks in advance
}
Try this code, Instead of extending ListActivity you can set layout that contains List View and separate layout for contents of List View.
Java Code :
public class Table_Layout extends Activity {
ListView list_view;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.table_layout);
list_view=(ListView)findViewById(R.id.list_view);
String[] names = new String[] { "India", "Malaysia" };
list_view.setAdapter(new ArrayAdapter<String>(this, R.layout.screen3,R.id.label, names));
}
}
Main XML that contains List View :table_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#drawable/uploading">
<ListView android:layout_width="fill_parent" android:layout_height="fill_parent"
android:id="#+id/list_view"
/>
Then Contents of List View :screen3.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView android:text="#+id/TextView01" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="#+id/label"
android:textColor="#FF0000"
android:textSize="30px"></TextView>
</LinearLayout>
Set you Background for the table_layout.xml so that it will applied for entire List View as you expected.
All looks well with your xml file. Try implementing the below mentioned:-
Make an image of the size you want your listview's each row of. And set it as the parent LinearLayout's background. Set:- android:layout_width="fill_parent" android:layout_height="wrap_content".
Hope this helps !! :)
Related
I have a problem with my personal adapter. When I search through the Observer pattern for information in a local database, it brings me the records but the adaptare is not called until you make a second attempt to delete and add the same petra to search. If I change the letter I have to delete it and re-enter it a second time so that it shows the help as you see in the image.
If you could help me I would appreciate it.
First search
enter image description here
second search. I delete the letter and enter it again
enter image description here
as you can see, now it works correctly.
I don't understood why.
Function call observer:
fun searchCountry(cadena:String){
var chain_1 = ""
if(cadena.trim().isNullOrEmpty()){
chain_1 = ""
}else{
chain_1 = cadena.trim() + "%"
}
locationViewModel.locationSearch(chain_1)
locationViewModel.locations.observe(this, Observer { locationList ->
autoCompleteTextView.setAdapter(LocationAdapter(this,locationList as List<Location>))
})
}
VieModel:
#HiltViewModel
class LocationViewModel #Inject constructor(private val getLocationUserCase: GetLocationUseCase) : ViewModel() {
val locations = MutableLiveData<List<Location?>>()
fun locationSearch(chain:String){
viewModelScope.launch {
val locationLst: List<Location> = getLocationUserCase(chain)
if(!locationLst?.isNullOrEmpty()){
locations.postValue(locationLst)
}else{
}
}
}
}
Adapter:
class LocationAdapter(context: Context, locations: List<Location>) : ArrayAdapter<Location>(context, 0, locations) {
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
val view = convertView ?: LayoutInflater.from(context).inflate(R.layout.account_frg_user_create_location_items, parent, false)
getItem(position)?.let { location ->
view.findViewById<TextView>(R.id.txtCountry).apply {
text = location.nom_municipio
}
view.findViewById<TextView>(R.id.txtProvince).apply {
text = location.nom_provincia
}
}
return view
}
}
XML-adapter:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:maxHeight="56dp"
android:padding="16dp"
android:layout_height="wrap_content">
<TextView
android:id="#+id/txtCountry"
android:layout_width="match_parent"
android:layout_weight="1"
android:textAppearance="#style/TextAppearance.MaterialComponents.Body1"
android:layout_height="wrap_content"
tools:text="Pueblo" />
<TextView
android:id="#+id/txtProvince"
android:layout_width="match_parent"
android:layout_weight="1"
android:textAppearance="#style/TextAppearance.MaterialComponents.Body2"
android:gravity="end"
android:layout_height="wrap_content"
tools:text="Provincia" />
</LinearLayout>
XML-Autocomepletetextview:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<AutoCompleteTextView
android:id="#+id/autoCompleteTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:completionThreshold="1"
android:imeOptions="actionDone"
android:inputType="text"
/>
</LinearLayout>
It is expected that when I enter a letter for the first time, it will show the search help that does show if I delete and add the same letter again or enter two letters or more.
Finally, I found my mistake. What happened is that the component, AutoCompleteTextView, already performed the same function that it was doing with the addTextChangedListener, so it searched for the information on both sides. Finally, the solution is to remove the addTextChangedListener, and pass the complete list to the adapter, since it is the autocomplete that is in charge of carrying out the search that it did on the database.
fun iniciacilarBd(){
locationViewModel.locationSearch("%")
// <!-- BASE_DE_DATOS
locationViewModel.locations.observe(this, Observer { locationList ->
locations = locationList
LocationAdapter(this,locations).also { locationAdapter ->
autoCompleteTextView.setAdapter(locationAdapter)
}
})
}
Thanks for the help
I want to add a logout option to the tool bar, which has the image view. due to fixed size in tool bar menu, i gone for a custom menu by specifying
app:actionLayout="#layout/custom_menu"
i specified this in my , and did a custom menu in custom_menu.xml.
now when i click the item, i want to perform some task, lets call something like a toast message for testing.
but when i click the in my tool bar, nothing responses.
what am i doing wrong here?
MyJavaActivity.java
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.logout, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.logOut) {
Toast.makeText(UserActivity.this, "logout clicked", Toast.LENGTH_LONG).show();
return true;
}
return super.onOptionsItemSelected(item);
}
logout.xml (menu for items)
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<item
android:id="#+id/logOut"
android:title="logout"
app:actionLayout="#layout/custom_menu"
app:showAsAction="ifRoom">
</item>
</menu>
custom_menu.xml (customizing my menu for toolbar)
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:layout_gravity="center">
<ImageView
android:id="#+id/logout"
android:layout_width="#dimen/menu_item_icon_size"
android:layout_height="#dimen/menu_item_icon_size"
android:layout_gravity="center"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="#drawable/ic_logout"
android:clickable="true"
android:elevation="5dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Actually Our custom menu item isn’t automatically given the same padding as a normal menu item. So the area that receives touch events is greatly reduced. I was just hunting around to click in the right area. We can fix this by adding a FrameLayout to our custom view.
make sure you have FrameLayout height and width is greater than the custom icon height and width.
this was the change i did in my custom_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="#dimen/menu_item_size"
android:layout_height="#dimen/menu_item_size">
<FrameLayout
android:layout_width="52dp"
android:layout_height="52dp"
android:layout_gravity="center">
<ImageView
android:id="#+id/logout"
android:layout_width="#dimen/menu_item_icon_size"
android:layout_height="#dimen/menu_item_icon_size"
android:layout_gravity="center"
android:elevation="5dp"
android:src="#drawable/ic_logout" />
</FrameLayout>
</FrameLayout>
here is the result.
In my Xamarin.Android app, I want to use ZXing to scan barcode. I want to display the scanner in the view of an activity.
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="5">
<Button
android:text="Scan with Default Overlay"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/buttonScanDefaultView"
android:layout_weight="1" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/scanView"
android:layout_weight="2" />
</LinearLayout>
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
scannerFragment = new ZXingScannerFragment ();
scannerFragment.CustomOverlayView = CustomOverlayView;
scannerFragment.UseCustomOverlayView = UseCustomOverlayView;
scannerFragment.TopText = TopText;
scannerFragment.BottomText = BottomText;
this.FragmentManager.BeginTransaction ()
.Replace (Resource.Id.scanView, scannerFragment, "ZXINGFRAGMENT")
.Commit ();
}
I'm getting an error stating that I cannot convert support.v4.fragment into android.app.Fragment.
Can anyone advise what I'm doing wrong and how should I approach this to get the scanner view (of ZXing) in a layout of my current activity.
ZXingScannerFragment derives from Android.Support.V4.App.Fragment while the Activity.FragmentManager expects fragments derived from Android.App.Fragment.
Now, how to fix that:
Inherit your activity from any activity that works with Android.Support.V4. Easiest would to use Android.Support.V4.App.FragmentActivity from package Xamarin.Android.Support.v4 that is already installed by ZXing.Net.Mobile package as a dependency.
When you have correct activity, you can use this.SupportFragmentManager instead of this.FragmentManager to work with Support.V4-based fragments.
So, layout you have is good. Code should be updated to something like:
using Android.App;
using Android.Widget;
using Android.OS;
using ZXing.Mobile;
using Android.Support.V4.App;
namespace ZXingSample
{
[Activity(Label = "ZXing Sample", MainLauncher = true, Icon = "#mipmap/icon")]
public class MainActivity : FragmentActivity
{
int count = 1;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Main);
var scannerFragment = new ZXingScannerFragment();
scannerFragment.UseCustomOverlayView = false;
scannerFragment.TopText = "Scan your code";
scannerFragment.BottomText = "Then proceed";
this.SupportFragmentManager.BeginTransaction()
.Replace(Resource.Id.scanView, scannerFragment, "ZXINGFRAGMENT")
.Commit();
}
}
}
Launching the app, you will see your scanner:
I am new to Android Development.
I read about ViewStub from https://developer.android.com/training/improving-layouts/loading-ondemand.html
It mentions that it is cheap and less memory to use it.
I have the following:
MainLayout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/Layout1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:background="#color/blue"
android:orientation="vertical" >
.....
.....
<Button android:id="#+id/ShowBackground"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
<Button android:id="#+id/ShowBackground2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="#string/title_close" />
<View
android:id="#+id/ShowView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#color/blue" />
<ViewStub
android:id="#+id/ShowViewStub"
android:layout="#layout/test"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone" />
</RelativeLayout>
test.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ShowViewLayout"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:background="#color/blue_dimmer"
android:orientation="vertical" >
</RelativeLayout>
MainActivity:
private ViewStub mViewStub;
private View mView;
private Button mBackground1;
private Button mBackground2
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.MainLayout);
mView = (ViewStub) findViewById(R.id.ShowView);
mViewStub = (ViewStub) findViewById(R.id.ShowViewStub);
mBackground1 = (Button)this.findViewById(R.id.ShowBackground);
mBackground1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mView.setVisibility(View.VISIBLE);
}
});
}
mBackground2 = (Button)this.findViewById(R.id. ShowBackground2);
mBackground2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mViewStub.setVisibility(View.VISIBLE);
}
});
}
Questions:
View and ViewStub are working fine in the MainActivity.
I do understand ViewStub is good for the view that is rarely used.
If ViewStub is called at least 1 time in the MainActivity, shouldn't it be more memory usage since the test.xml layout is added to the activity?
As I can see is that ViewStub is always visible unless it is called View.Gone....
Can someone please explain what the differences between the two?
I greatly appreciate for your help,
Thank you.
The < include /> will just include the xml contents in your base xml file as if the whole thing was just a single big file. It's a nice way to share layout parts between different layouts.
The < ViewStub /> is a bit different because it is not directly included, and will be loaded only when you actually use it/need it, ie, when you set its visibility to VISIBLE (actually visible) or INVISIBLE (still not visible, but its size isn't 0 anymore). This a nice optimization because you could have a complex layout with tons of small views or headers anywhere, and still have your Activity load up really fast. Once you use one of those views, it'll be loaded.
I have an AsyncTask linked to a refresh Button (when I click on my refresh button my AsyncTask is called).
I have on my Layout a LinearLayout field for my ProgressBar :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#color/grey">
<Button android:id="#+id/refresh_p"
android:text="#string/refresh_promo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/custom_button1"/>
<LinearLayout android:id="#+id/linearlayoutProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"/>
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:listSelector="#color/tabTransparent"
android:cacheColorHint="#00000000"/>
<!-- <ListView android:id="#+id/list_promo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>-->
</LinearLayout>
In my AsyncTask :
#Override
protected void onPreExecute()
{
super.onPreExecute();
pb = new ProgressBar(context);
LinearLayout ll = (LinearLayout) ((Activity) context).findViewById(R.id.linearlayoutProgressBar);
ll.addView(pb);
pb.setVisibility(View.VISIBLE);
}
#Override
protected void onPostExecute(ArrayList<HashMap<String, String>> promoList)
{
...
if (pb!=null)
{
pb.setVisibility(View.GONE);
((LinearLayout)pb.getParent()).removeView(pb);
}
}
The problem I have is when I make more than 2 clicks on my Refresh Button then Multiple ProgressBar are displaying into the screen.. I just want that the new ProgressBar replace the old at the same position ..
My guess is that you are probably starting your AsyncTask in a manner similar to this:
new RefreshTask().execute(params);
Instead of that, create an instance variable in your activity. Let's say this is named mTask and substitute the above code for the following call:
if(mTask != null && mTask.getState != AsyncTask.State.RUNNING){
mTask = new RefreshTask();
mTask.execute(params);
}
This way you will ensure that only one instance of your task is running at a given time and the user will have to wait until the refresh is finished before he can start a new refresh.
If you want the user to be able to cancel an existing refresh task and run a new one, you will have to cancel the old one before starting a new one:
if(mTask != null){
if(mTask.getStatus() == AsyncTask.Status.RUNNING){
mTask.cancel(true);
}
mTask = new RefreshTask();
mTask.execute(params);
}
This way the old task and it's ProgressBar will be properly replaced by the new one.