I want to make a popup list like above in that list there will be different distances and when i click on a distance in that distance's description will be shown from the following list. please help
atleast tell how to make popup list. For Android
Thanks
I think you're referring to a Spinner. Its very easy to use. If you're only using a specific set of values for the drop down list you can use string array resource as the source of data for the Spinner. Define in XML under the values directory an array like this. Put as many items in as you need for the Spinners drop down list.
<string-array name="distances">
<item>1 Mile</item>
<item>2 Miles</item>
</string-array>
In a layout file define a Spinner widget
<Spinner
android:id="#+id/spinnerDistances"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
And then in whatever activity you use that layout in:
Spinner spinner = (Spinner) findViewById(R.id.spinnerDistances);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.distances, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
Don't forget to define an event listener for the spinner so the program can do something when a user selects something on the Spinner.
EDIT:
To do something when an item is selected from the spinner you need to override OnItemSelectedListener.onItemSelected() and set the Spinner to use that listener with Spinner.setOnItemSelectedListener(). You can do this by making your class implement OnItemSelectedListener and implementing the required methods or something like:
mySpinner.setOnItemSelectedListener(new OnItemSelectedListener()
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
// TODO Auto-generated method stub
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
);
Well you can create activity in android with
<activity
android:name=".youractivityname"
android:screenOrientation="portrait"
android:theme="#android:style/Theme.Dialog" />
And add list view in this activity with your desired item in the list.
The theme dialog creates your activity as a dialog and show as its a kind of popup
Please let me know if this helps you
Related
I have an android spinner that allows the user to select a translation. I can tap the spinner and it will reveal a list with available translations, but when I select an item in the list it will not appear in the spinner and neither does the onItemSelected method get called.
Here is the xml code for the spinner:
<Spinner
android:id="#+id/trans_list"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_toRightOf="#+id/chap_list"
android:layout_weight="1" />
Here is the relevant code for initiating the spinner. (edit) This code is ran from inside a Fragment class and not from my MainActivity class:
trans_spinner = v.findViewById(R.id.trans_list);
ArrayAdapter<String> adapter = new ArrayAdapter<>(v.getContext(), android.R.layout.simple_spinner_dropdown_item, translations);
trans_spinner.setAdapter(adapter);
trans_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String translation = trans_spinner.getItemAtPosition(trans_spinner.getSelectedItemPosition()).toString();
Log.d("trans", translation);
Toast.makeText(view.getContext(), translation, Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
Log.d("test", "1");
}
});
trans_spinner.setSelection(1);
Neither the onItemSelected() or onNothingSelected() method gets called when I select an item. I found this page describing an issue very similar to mine:
Android Spinner will not launch OnItemSelected and current selected item is not displayed in Spinner
However the user did not present a clear solution to their problem so it doesn't help me much.
I am not sure if it is relevant, but the items in the spinner are taken from an online webpage that provides JSON data to fill the spinner. This seems to work, as the options do appear in the spinner list. The issue is that upon selecting one of them, the spinner appears empty and the listener doesn't do anything.
So I found out that the issue was actually because of how I obtained the list of strings to put inside the spinner. As mentioned in the original post, I am loading the string values from a webpage in JSON format. I'm using the Retrofit2 API for this.
The problem was caused by the fact that I was downloading this data and then initializing the spinner both in the onCreateView() method of my fragment. What I did to fix it is I created a new method that initializes the spinner, and then I would call it from the onResponse() method used by the Retrofit API. This means that it doesn't initialize the spinner until after it has finished downloading/populating the list of strings.
<Spinner
android:id="#+id/planets_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
f the available choices for your spinner are pre-determined, you can provide them with a string array defined in a string resource file:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="planets_array">
<item>Mercury</item>
<item>Venus</item>
<item>Earth</item>
<item>Mars</item>
<item>Jupiter</item>
<item>Saturn</item>
<item>Uranus</item>
<item>Neptune</item>
</string-array>
</resources>
With an array such as this one, you can use the following code in your Activity or Fragment to supply the spinner with the array using an instance of ArrayAdapter:
Spinner spinner = (Spinner) findViewById(R.id.spinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.planets_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
When the user selects an item from the drop-down, the Spinner object receives an on-item-selected event.
To define the selection event handler for a spinner, implement the AdapterView.OnItemSelectedListener interface and the corresponding onItemSelected() callback method. For example, here's an implementation of the interface in an Activity:
public class SpinnerActivity extends Activity implements OnItemSelectedListener {
...
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
// parent.getItemAtPosition(pos)
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
}
The AdapterView.OnItemSelectedListener requires the onItemSelected() and onNothingSelected() callback methods.
Then you need to specify the interface implementation by calling setOnItemSelectedListener():
Spinner spinner = (Spinner) findViewById(R.id.spinner);
spinner.setOnItemSelectedListener(this);
If you implement the AdapterView.OnItemSelectedListener interface with your Activity or Fragment (such as in the example above), you can pass this as the interface instance.
Java Code
public class MainActivity extends AppCompatActivity {
Spinner spinner;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = findViewById(R.id.spinner);
List<String> translations = new ArrayList<>();
translations.add("string1");
translations.add("string2");
translations.add("string3");
translations.add("string4");
translations.add("string5");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, translations);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Object getPosition = parent.getItemAtPosition(position);
String value = getPosition.toString();
Toast.makeText(getActivity(), value, Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
XML Code
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/spinner">
</Spinner>
Add this code after init adapter
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
And to get the selected item inside onItemSelected
translations.get(position)
I am dynamically adding the Spinners in my application by parsing the XML file.
I have done using the below code
List<Spinner> allspin = new ArrayList<Spinner>();
Spinner spin = new Spinner(getParent());
allspin.add(spin);
spin.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getParent(),
android.R.layout.simple_spinner_item, selectval);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spin.setAdapter(adapter);
Spinners are displayed correctly but i don't know how to retrieve the value of selected spinner. If there is one spinner i can retieve, but there are multiple how should i do?
You can get the reference of the spinner from your arraylist like this :
Spinner spn = allspin.get(index);
After that you can get the selected item by simply calling:
spn.getSelectedItemPosition();
You can set id of spinner dynamically.
For that,you can use
spin.setId(i); //if you use i of for loop for creating multipal spin at a tym or you can use a global variable i,incremented by one each time you create a spinner
and further,you can use those ids to get values from particular spinner.
Example:
for(int i=1;i<4;i++)
{
Spinner spin=new Spinner(getApplicationCotext());
spin.setId(i);
...
//other code
...
mLayout.add(spin);//add this spinner to your layout(mLayout is object of your layout in xml)
}
Now,
for(int i=1;i<4;i++)
{
Spinner sp=(Spinner)findViewById(i);
sp.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
System.out.println(sp.getText().toString());//prints values of a pinner when it is changed/selected
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}
If you need multiple spinners (I'm not sure I understand your use case), then, as you're creating each of them, you need to also create the appropriate listeners. You shouldn't have to retrieve values of spinners yourself; handling these selection events should be done in your listeners. Perhaps if you explained what you're attempting to do a bit better it would be easier to help...
I have two spinners. Country and City.
I want to dynamically change the City's values upon Country selection.
I know how to create and initialize the values of Country but don't know how to set and change the City's values.
Any guidance is appreciated.
UPDATES1
The problem is, I don't have idea on how to update the content of City Spinner. I know listener and other basics on how to create a fixed spinner.
For the second spinner, use an Adapter over a List<String> (or whatever your City representation is). After changing the contents of the list, call notifyDataSetChanged on the adapter, and that will do.
You need to get a programmatic reference to the spinner, something like this:
Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.planets_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
Then to update your city's values, use an OnItemSelectedListener, like this:
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
//update content of your city spinner using the value at index,
// id, or the view of the selected country.
}
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
Finally, you need to bind the listener to the country spinner like this:
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
see here for reference: http://developer.android.com/resources/tutorials/views/hello-spinner.html
all i have two spinners spinner1 & spinner2. in one spinner i am showing names from database.(Ex. onkar) now if i select onkar name on spinner1 then all names must be occurred on spinner2 except name onkar.
i want to do like this.but i am not getting how to achieve it?
give me some sample or give idea for the same.
or can i change data of spinner dynamically????
Thanks in Advance--
consider that u have used two adapters to set data to spinner when u select first spinner just remove that value from second adapter and then call method notifyDataSetChanged() it will change second spinner data.
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
super.onItemSelected(parent, view, position, id);
// Step 1: Remove Data from ArrayList 1
// Step 2: Adpater for first spinner .notifiyDataSetChanged()
}
I have a spinner with a background image. But when I add array adapter to the spinner, the text is shown on the background image. I want to hide this text. There is also a TextView. My requirement is, when I click the image, the spinner should pop up and when I selects an item, the TextView gets updated with the selected item.
Spinner spin = (Spinner) d.findViewById(R.id.searchCriteria);
spin.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// hide selection text
((TextView)view).setText(null);
// if you want you can change background here
}
public void onNothingSelected(AdapterView<?> arg0) {}
});
Create ghost_text.xml in your layouts folder with this text:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#android:color/transparent" />
Then use that file in your adapter like this:
ArrayAdapter<String> your_adapter = new ArrayAdapter<String>(this,
R.layout.ghost_text, your_list);
your_spinner.setAdapter(your_adapter);
You should also be able to use this technique with other resource-based adapters.
Probably you can define a xml-layout file, without any textview in it, and supply it to the adapter for the spinner.
e.g. empty_spinner_item.xml
<ImageView xmlns:android="http..."
android:layout_width=".."
/>
and then use any adapter:
spinner.setAdapter(new SimpleAdapter(this, data, R.layout.empty_spinner_item, ... ));