I have a simple program where I set a spinner to a position. I then call a second module and when I return, I reset the spinner. The spinner display does not display the spinner value. When you tap the spinner, it IS pointing to the correct value, but it displays an incorrect value. In fact, it actually steps down.
I wrote the following simple program to demonstrate. This only happens when the form has a spinner within either a Linearlayout or TableLayout with at lease 1 other element.
main.xml
<?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"
>
<TextView
android:layout_width="fill_parent" android:layout_height="200dp"
android:text="Main Form" />
<LinearLayout android:id="#+id/widget43"
android:layout_width="320dp" android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="#+id/btn" android:text="Button" android:textSize="16sp"
android:layout_width="160dp" android:layout_height="40dp" />
<Spinner
android:id="#+id/btnFour" android:textSize="16sp"
android:layout_width="160dp" android:layout_height="40dp" />
</LinearLayout>
</LinearLayout>
next.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="#+id/id1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Next"
/>
</LinearLayout>
main.java
package tt.zzz;
import android.app.Activity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
public class main extends Activity {
#Override
protected void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
fillSpinner();
Button btnGo = (Button) findViewById(R.id.btn);
btnGo.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) { Go(); } });
}
void Go() {
Intent i = new Intent(this, next.class );
startActivityForResult( i, 0 );
}
public void fillSpinner(){
Spinner spin_test = (Spinner) findViewById( R.id.btnFour );
ArrayAdapter<CharSequence> myAdapter =
new ArrayAdapter<CharSequence>(
this,
android.R.layout.simple_spinner_item
);
myAdapter.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item);
myAdapter.add("Option 1" );
myAdapter.add("Option 2" );
myAdapter.add("Option 3" );
spin_test.setAdapter(myAdapter);
spin_test.setSelection(1);
spin_test.setOnItemSelectedListener(
new Spinner.OnItemSelectedListener(){
public void onItemSelected(AdapterView<?>
arg0,View arg1,int arg2,long arg3){
}
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
fillSpinner();
}
}
next.java
package tt.zzz;
import android.app.Activity;
import android.os.Bundle;
public class next extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.next);
}
}
After your setSelection, add the following line:
myAdapter.notifyDataSetChanged();
I would do the same as barmaley suggested, except add the following:
#Override
public void onResume()
{
super.onResume();
fillSpinner();
}
The reason why that's needed is because you launch another activity, so this one is paused.
Try to call
#Override
public void onStart()
{
super.onStart();
this.fillSpinner();
}
Since onCreate called only once, so to update Spinner each time you should refresh it somewhere else. onStart() - appropriate place for that
Related
The Register Button works well, but the debugger doesn't run into the setOnItemClickListener onItemClick. If You click on a item, the activity for editing the record should be launched.
package at.bomsbg.MindX;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import at.bomsbg.MindX.sqlite.helper.MindXopenHelper;
import at.bomsbg.MindX.sqlite.helper.MindXtableAdapter;
public class Activity_cardmanager extends Activity {
MindXtableAdapter mindxtableadapt;
MindXopenHelper openHelper;
ListView nameList;
Button registerBtn;
Cursor cursor;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cardmanager);
nameList = (ListView) findViewById(R.id.title);
registerBtn = (Button) findViewById(R.id.btn_register);
mindxtableadapt = new MindXtableAdapter(this);
String[] from = { MindXopenHelper.title, MindXopenHelper.detail,
MindXopenHelper.active };
int[] to = { R.id.tv_title, R.id.tv_detail, R.id.tv_active };
cursor = mindxtableadapt.queryName();
SimpleCursorAdapter cursorAdapter =
new SimpleCursorAdapter(this,
R.layout.row, cursor, from, to);
nameList.setAdapter(cursorAdapter);
nameList.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> tobjParent, View tobjView,
int tintPosition, long tlngid) {
Bundle passdata = new Bundle();
Cursor listCursor = (Cursor) tobjParent
.getItemAtPosition(tintPosition);
int nameId = listCursor.getInt(listCursor
.getColumnIndex(MindXopenHelper.KEY_ID));
passdata.putInt(MindXopenHelper.KEY_ID, nameId);
Intent passIntent = new Intent(Activity_cardmanager.this,
Activity_edit_mindxtables.class);
Toast.makeText(getApplicationContext(),
Integer.toString(nameId), 500).show();
passIntent.putExtras(passdata);
startActivity(passIntent);
}
});
registerBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent registerIntent = new Intent(Activity_cardmanager.this,
Activity_MindXtablesRecord.class);
startActivity(registerIntent);
}
});
}
#Override
public void onResume() {
super.onResume();
cursor.requery();
}
}
activity_Cardmanager.html
<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" >
<ListView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
<Button
android:id="#+id/btn_register"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/register" />
</LinearLayout>
row.xml
I add the item clickable for the textfield. I think that is not realy necesarry.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:orientation="horizontal" >
<TextView
android:id="#+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:width="100dp" />
<TextView
android:id="#+id/tv_detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:width="100dp" />
<CheckBox
android:id="#+id/tv_active"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp" />
</LinearLayout>
You have focusable/clickable items in your list view item - the checkbox.
Option 1 - Set the android:descendantFocusability="blocksDescendants" flag to your ListView and you should have fired the onItemClickListener.
Option 2 - In your Adapter you can set an onClickListener on the entire list view item object, and handle it from there.
the Problem of my solution was on row.xml
again thanX on all:
row.xml
<LinearLayout
android:clickable="true" (removed)
<TextView
android:id="#+id/tv_title"
android:onClick="Title" (added)
android:clickable="true" (added)
android:focusable="true" (added)
on my Activity_cardmanager I inserted following code after nameList.setAdapter...
nameList.setClickable(true); // 2015-04-14
nameList.setFocusable(true); // 2015-04-14
nameList.setItemsCanFocus(true); // 2015-04-14
setViewItemListener();
.
.
.
public void setViewItemListener() {
nameList.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> tobjParent, View tobjView, int tintPosition, long tlngid) {
Bundle passdata = new Bundle();
// Cursor listCursor = (Cursor) tobjParent.getItemAtPosition(tintPosition);
Cursor listCursor = (Cursor) nameList.getItemAtPosition(tintPosition); //2015-04-15
int nameId = listCursor.getInt(listCursor
.getColumnIndex(MindXopenHelper.KEY_ID));
passdata.putInt(MindXopenHelper.KEY_ID, nameId);
Intent passIntent = new Intent(Activity_cardmanager.this,
Activity_edit_mindxtables.class);
Toast.makeText(getApplicationContext(),
Integer.toString(nameId), Toast.LENGTH_LONG).show();
passIntent.putExtras(passdata);
startActivity(passIntent);
}
});
}
the returnValue is true, but that is another story.
I just want to know if this is possible since first. I have created a custom listView based on the tutorial I read from Sai Geetha. Well it works perfectly on my app except that it needs to extend ListActivity instead of FragmentActivity. Now I'm having a hard time configuring and adding a dialog for this since I need to apply a fragment dialog and I can't use the getFragmentManager() since I'm not working with the FragmentActivity. Is there's another way I can do to work on this without sacrificing the ListActivity? Thanks!
Here's my code so far
XML:
conversation_list_view
<?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="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#id/android:list"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="20dp"/>
</LinearLayout>
group_screen
<?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="match_parent"
android:background="#color/white">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="48dp"
android:background="#drawable/action_bar_separator"
android:id="#+id/relativeLayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Group Name"
android:id="#+id/txt_group_name"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textColor="#color/dark_gray"
android:shadowColor="#color/dark_shadow"
android:shadowRadius="1"
android:shadowDy="1"/>
<Button
android:layout_width="32dp"
android:layout_height="32dp"
android:id="#+id/btn_back"
android:background="#drawable/btn_navigate_back"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"/>
<Button
android:layout_width="32dp"
android:layout_height="32dp"
android:id="#+id/btn_information"
android:background="#drawable/btn_information"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"/>
</RelativeLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Conversations"
android:id="#+id/textView2"
android:textColor="#color/holo_light_blue"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="340dp"
>
<fragment
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="com.mark.exercise.ListViewFragment"
android:id="#+id/fragment"/>
</LinearLayout>
<Button
android:layout_width="match_parent"
android:layout_height="42dp"
android:text="Ask something"
android:id="#+id/btn_ask_question"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"
android:textSize="15dp"/>
</LinearLayout>
</LinearLayout>
Java
package com.mark.exercise;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
/**
* Created by pc on 9/24/13.
*/
public class GroupActivity extends FragmentActivity {
Button information, back, new_topic;
ListView conversations;
TextView group_name;
String name, group_description, group_administrator,image_id;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.group_screen);
Intent intent = getIntent();
name = intent.getStringExtra("group_name");
group_description = intent.getStringExtra("group_description");
group_administrator = intent.getStringExtra("group_administrator");
image_id = intent.getStringExtra("image_id");
information = (Button)findViewById(R.id.btn_information);
back = (Button)findViewById(R.id.btn_back);
new_topic = (Button)findViewById(R.id.btn_ask_question);
group_name = (TextView)findViewById(R.id.txt_group_name);
group_name.setText(name);
information.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(GroupActivity.this, GroupInformationActivity.class);
intent.putExtra("group_name",name);
intent.putExtra("group_description",group_description);
intent.putExtra("group_administrator",group_administrator);
intent.putExtra("image_id",image_id);
startActivity(intent);
GroupActivity.this.overridePendingTransition(R.anim.in_from_left, R.anim.out_to_right);
}
});
new_topic.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showCreateNewTopicDialog();
}
});
back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});
}
private void showCreateNewTopicDialog() {
FragmentManager fm = getSupportFragmentManager();
DialogFragmentCreateGroup createGroup = new DialogFragmentCreateGroup();
createGroup.show(fm, "create_group");
}
#Override
public void onBackPressed(){
super.onBackPressed();
overridePendingTransition(R.anim.in_from_right,R.anim.out_to_left);
}
}
List Fragment
package com.mark.exercise;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
/**
* Created by pc on 9/27/13.
*/
public class ListViewFragment extends ListFragment {
final ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.conversations_list_view,
container, false);
setListView set_list = new setListView();
set_list.start();
return view;
}
public void onListItemClick(ListView l, View v, int position, long id) {
//super.onListItemClick(l, v, position, id);
Intent intent = new Intent(getActivity(), ConversationActivity.class);
startActivity(intent);
getActivity().overridePendingTransition(R.anim.in_from_left, R.anim.out_to_right);
}
private class setListView extends Thread {
public void run() {
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
setConversations();
}
});
}
}
private void setConversations(){
list.clear();
SimpleAdapter adapter = new SimpleAdapter(
getActivity(),
list,
R.layout.custom_list_main_conversations,
new String[] {"message","date", "reply_count", "stars_count"},
new int[] {R.id.txt_conversation_message,R.id.txt_topic_date, R.id.txt_no_of_reply, R.id.txt_no_of_stars}
);
for(int ctr=0;ctr<=5;ctr++){
Random randomGenerator = new Random();
HashMap<String,String> item_list = new HashMap<String,String>();
item_list.put("message", "This is the conversation number "+(ctr+1)+" and this topic is just a dummy data.");
item_list.put("date", "0"+(ctr+1)+"/0"+(ctr+2)+"/2013 "+(ctr+1)+":00:am");
item_list.put("reply_count", String.valueOf(ctr+randomGenerator.nextInt(10)));
item_list.put("stars_count", String.valueOf(ctr+randomGenerator.nextInt(10)));
list.add(item_list);
}
android.app.ListFragment lf = new android.app.ListFragment();
lf.setListAdapter(adapter);
}
}
You can use ListFragment inside FragmentActivity instead of using a ListActivity.
Main.xml
<?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"
>
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/spin"
android:entries="#array/num"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/btn"
android:text="Click ME"
android:gravity="center"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/txtv"
/>
</LinearLayout>
Spin.java
package com.and.spin;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
public class spin extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final TextView tv=(TextView)findViewById(R.id.txtv);
Button b=(Button)findViewById(R.id.btn);
final Spinner s=(Spinner)findViewById(R.id.spin);
b.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String spin=s.toString();
tv.setText(spin);
}
});
}
}
In this program, i'm trying to display selected options from the Spinner to the TextView. But output dsiplays android.widget.Spinner#44c0d7f8
I want output like (1,2,3,4 or 5) as the option selected in Spinner rather than android.widget.Spinner#44c0d7f8
You dont need shared preference to load values in spinner. You just need to declare array in string.xml file and load that.I am giving you my code.Just use it.:-
STEP-1:-
Declare array for spinner in your string.xml(res->values->strings.xml):--
<string-array name="country_array">
<item>Greece</item>
<item>United Kingdom</item>
<item>Italy</item>
<item>France</item>
<item>Germany</item>
<item>Turkey</item>
<item>Poland</item>
<item>India</item>
</string-array>
STEP-2:-
Declare Spinner widget in your layout xml file
<Spinner
android:id="#+id/spinCountry"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:paddingLeft="8dp"
android:popupBackground="#android:color/white"
android:scrollbars="none"
android:spinnerMode="dropdown" />
STEP-3:-
Declare Spinner in your Activity
Spinner spinCountry;
spinCountry= (Spinner) findViewById(R.id.spinCountry);//fetch the spinner from layout file
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, getResources()
.getStringArray(R.array.country_array));//setting the country_array to spinner
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinCountry.setAdapter(adapter);
//if you want to set any action you can do in this listener
spinCountry.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long id) {
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
b.setOnClickListener(new OnClickListener()
{
public void onClick(View arg0)
{
String spin=s.getSelectedItem().toString();
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tv.setText(spin);
}
});
spinCountry.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView,
View selectedItemView, int position, long id) {
try {
String select_item =parentView.getItemAtPosition(position).toString();
}
catch (Exception e) {
}
}
#Override
public void onNothingSelected(AdapterView<?> parentView) {
}
});
You are calling toString() method on spinner to get the selection which is wrong. You need to call getSelectedItemPosition() method to get the selection.
I'm very new to Android development and just started to study.
What I'm trying is to add a button and when that button is pressed a text "my first project" to get displayed in the text view.
With the help of some experts I created the button and text view.
So the button is showing in the simulator but when I click that button nothing happens.
Can anyone please help me with how can I display the text when pressing the button?
.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/txtView"
android:layout_width="150dp"
android:layout_height="150dp"
android:text="#string/hello" />
<Button
android:id="#+id/mybtn"
android:layout_width="50dp"
android:layout_height="30dp" />
<TextView
android:id="#+id/viewwidth"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/viewheight"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;
import android.widget.Toast;
public class NameonbuttonclickActivity extends Activity implements View.OnClickListener {
Button mybtn;
TextView txtView;
String hello;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.main);
super.onCreate(savedInstanceState);
mybtn= new Button(this);
txtView=new TextView(this);
mybtn.setOnClickListener(this);
printmyname();
mybtn = (Button)findViewById(R.id.mybtn);
txtView=(TextView)findViewById(R.id.txtView);
txtView = (TextView)findViewById(R.id.viewwidth);
txtView = (TextView)findViewById(R.id.viewheight);
hello="This is my first project";
//setContentView(mybtn);
// setContentView(R.layout.main);
}
public void onClick(View view){
txtView.setText(hello);
//printmyname();
Toast.makeText(NameonbuttonclickActivity.this, hello, Toast.LENGTH_LONG).show();
}
private void printmyname(){
System.out.println("coming");
}
}
You can do like this:
String hello;
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.main);
super.onCreate(savedInstanceState);
mybtn = (Button)findViewById(R.id.mybtn);
txtView=(TextView)findViewById(R.id.txtView);
txtwidth = (TextView)findViewById(R.id.viewwidth);
hello="This is my first project";
mybtn.setOnClickListener(this);
}
public void onClick(View view){
txtView.setText(hello);
}
Check your textview names. Both are same . You must use different object names and you have mentioned that textview object which is not available in your xml layout file.
Hope this will help you.
First create xml file as follows. Create one textview and a button:
main.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="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello" />
<Button
android:id="#+id/mybutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click Me" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
The first TextView is created by default. You can leave or remove it if you want.
Next one is to create a button
The next one is TextView where you want to display text.
Now coming to the main activity code...
package com.android.example.simple;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class SimpleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final TextView textView=(TextView)findViewById(R.id.textView1);
final Button button1 = (Button)findViewById(R.id.mybutton);
//Implement listener for your button so that when you click the
//button, android will listen to it.
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
textView.setText("You clicked the button");
} });
}
}
This is because you DON'T associated the OnClickListener() on the button retrieve from the XML layout.
You don't need to create object because they are already created by the Android system when you inflate XML file (with the Activity.setContentLayout( int resourceLayoutId ) method).
Just retrieve them with the findViewById(...) method.
Just check your code in .java class
You had written below line
mybtn.setOnClickListener(this);
before initializing the mybtn object I mean
mybtn = (Button)findViewById(R.id.mybtn);
just switch this two line or put that line "mybtn.setOnClickListener(this)" after initializing your mybtn object and you will get the answer what you want..
Try this
public void onClick(View view){
txtView.setText("hello");
//printmyname();
Toast.makeText(NameonbuttonclickActivity.this, "hello", Toast.LENGTH_LONG).show();
}
Also in toast use "Hello"
you use this as txtView.setText("hello");
MainActivity.java:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button1;
TextView textView1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1=(Button)findViewById(R.id.button1);
textView1=(TextView)findViewById(R.id.textView1);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
textView1.setText("TextView displayed Successfully");
}
});
}
}
activity_main.xml:
<?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" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click here" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
public void onCreate(Bundle savedInstanceState)
{
setContentView(R.layout.main);
super.onCreate(savedInstanceState);
mybtn = (Button)findViewById(R.id.mybtn);
txtView=(TextView)findViewById(R.id.txtView);
mybtn .setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
txtView.SetText("Your Message");
}
});
}
Check this:
hello.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View paramView) {
text.setText("hello");
}
});
I'm having problems using s.requestFocus() when s is a spinner. Is there a special treatment to get it to work when it's a spinner ?
Thanks
try this code..
spinner.setFocusable(true);
spinner.setFocusableInTouchMode(true);
I'm guessing you aren't literally just looking to "give focus" to the spinner. When you give focus to an EditText, the keyboard pops up, so you may be expecting the spinner selection to "open up" on focus - but it doesn't work that way (don't ask me why). Use s.performClick() to do this - it will act just as if the user clicked on the spinner control.
use this
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
public class dynamic_spinner_main extends Activity {
private Spinner m_myDynamicSpinner;
private EditText m_addItemText;
private ArrayAdapter<CharSequence> m_adapterForSpinner;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_spinner);
///////////////////////////////////////////////////////////////
//grab our UI elements so we can manipulate them (in the case of the Spinner)
// or add listeners to them (in the case of the buttons)
m_myDynamicSpinner = (Spinner)findViewById(R.id.dynamicSpinner);
m_addItemText = (EditText)findViewById(R.id.newSpinnerItemText);
Button addButton = (Button)findViewById(R.id.AddBtn);
Button clearButton = (Button)findViewById(R.id.ClearBtn);
////////////////////////////////////////////////////////////////
//create an arrayAdapter an assign it to the spinner
m_adapterForSpinner = new ArrayAdapter(this, android.R.layout.simple_spinner_item);
m_adapterForSpinner.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m_myDynamicSpinner.setAdapter(m_adapterForSpinner);
m_adapterForSpinner.add("gr");
m_myDynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
// your code here
Intent mIntent=new Intent(dynamic_spinner_main.this,sampleLocalization.class);
mIntent.putExtra("lang", m_myDynamicSpinner.getItemIdAtPosition(position));
System.out.println("Spinner value...."+m_myDynamicSpinner.getSelectedItem().toString());
startActivity(mIntent);
}
#Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}
});
////////////////////////////////////////////////////////////////
//add listener for addButton
addButton.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
addNewSpinnerItem();
}
});
////////////////////////////////////////////////////////////////
//add listener for addButton
clearButton.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
clearSpinnerItems();
}
});
}
private void addNewSpinnerItem() {
CharSequence textHolder = "" + m_addItemText.getText();
m_adapterForSpinner.add(textHolder);
}
private void clearSpinnerItems() {
m_adapterForSpinner.clear();
m_adapterForSpinner.add("dummy item");
}
}
main_spinner.xml
<?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">
<EditText android:layout_height="wrap_content"
android:layout_margin="4px"
android:id="#+id/newSpinnerItemText"
android:layout_width="fill_parent"></EditText>
<Button android:layout_height="wrap_content"
android:id="#+id/AddBtn"
android:layout_margin="4px"
android:layout_width="fill_parent"
android:text="Add To Spinner"></Button>
<Button android:layout_height="wrap_content"
android:id="#+id/ClearBtn"
android:layout_margin="4px"
android:layout_width="fill_parent"
android:text="Clear Spinner Items"></Button>
<Spinner android:layout_height="wrap_content"
android:id="#+id/dynamicSpinner"
android:layout_margin="4px"
android:layout_width="fill_parent"></Spinner>
</LinearLayout>
Spinner isn't focusable by default (source). So you have to make it focusable either in xml
<Spinner
android:id="#+id/spinner"
android:focusable="true"
android:layout_width="wrap_conten"
android:layout_height="wrap_content" />
or in code
findViewById(R.id.spinner).setFocusable(true);