Develop Reference

Pass Values to ListView by Clicking a Button

I want to pass values to list view by clicking a button. Problem is I want to make a list by gaining values from different activities with several buttons.
For Example :
In EnglandActivity if I click Button Visit I want to pass "England" to ListView in MainActivity,
In MalaysiaActivity pass "Malaysia" to ListView in MainActivity.
I dont know how to do that, Can you help me??

First Of All, You should write this on your onCreate() method of MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String data;/*For Storing Country Name*/
ListView listview = (ListView)findViewById(R.id.listView); /*Finding ListView From Layout*/
ArrayList<String> list = new ArrayList<String>(); /*ArrayList To Store All The Data Of ListView*/
ArrayAdapter adapter= new ArrayAdapter<String>(this,R.layout.android.R.layout.simple_list_item_1,list);/*Defining ArrayAdapter For ListView*/
listview.setAdapter(adapter); /*Setting Adapter To ListView*/
Bundle intentExtras = getIntent().getExtras(); /*Getting The Intent Extras Sent By The Activity Which You Had Navigated From*/
if(intentExtras != null) {/*Checking For Null*/
data= intentExtras.getString("countryName");/*Extracting The Data From The Intent Extras*/
list.add(0,data);/*You Can Replace 0 With The Position Of Your Wish*/
} else {
data=null;
}
}
Now Write This In The OnClickListener() Method Of Button On Each CountryNameActivity.java
btn.setOnClickListener(new OnClickListener() {/*Setting The Click Listener*/
#Override
public void onClick(View v) {
Intent intent = new Intent(this,MainActivity.this)/*Defining The Intent*/
intent.putExtra("countryName","CountryName");/*Putting The Data To Pass To The Next Activity*/
startActivity(intent);/*Starting The Activity*/
}
});

Make an object shared by all of your activity, put your data there and read them when you must put data into your ListView's adapter

myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int
position, long id) {
Intent listIntent = new Intent(getApplicationContext(), YourActivity.class);
listIntent.putExtra("country", yourList.get(position));
startActivity(listIntent);
}
});
in next activity onCreate:
String country;
Bundle extras = getIntent().getExtras();
if(extras == null) {
country= null;
} else {
country= extras.getString("country");
}

get user inputs from an editText and populate listView

How can i get user inputs from one activity and populate the listView with user data in another activity. I am able to get user input and populate the listView in the same activity. but now i want to get user inputs in one form and populate the list in another activity.
the code that i used to populate the listView by getting user input is as follows
public class MainActivity extends ListActivity {
ArrayList<String> list = new ArrayList<String>();
/** Declaring an ArrayAdapter to set items to ListView */
ArrayAdapter<String> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button) findViewById(R.id.btnAdd);
/** Defining the ArrayAdapter to set items to ListView */
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
/** Defining a click event listener for the button "Add" */
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText edit = (EditText) findViewById(R.id.txtItem);
String name=edit.getText().toString();
list.add(name);
edit.setText("");
adapter.notifyDataSetChanged();
}
};
/** Setting the event listener for the add button */
btn.setOnClickListener(listener);

you can store your user input / data into a local database; that will allow you to access your data anywhere in the app
(recommended since you are dealing with listview).
you can use shared preferences to store data if your data is relatively small.

In your current Activity (activity contains your button), create a new Intent:
String name = "";
name = edit.getText().toString();
Intent i = new Intent(getApplicationContext(), NewActivity.class);
i.putExtra("keyword",name);
startActivity(i);
Then in the NewActivity (activity contains your Listview), retrieve those values:
Bundle extras = getIntent().getExtras();
if (extras != null) {
String name = extras.getString("keyword");
if(name != ""){
// adapter.notifyDataSetChanged();
}
}
It is simple way, hope this help

Declare a public method in second Activity like
SecondActivity.class
public static ArrayList<String> list = new ArrayList<String>();
/** Declaring an ArrayAdapter to set items to ListView */
ArrayAdapter<String> adapter
onCreate()
{
...
;
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);
listview.setAdapter(adapter);
...
}
public static void ModifyList()
{
adapter.notifyDataSetChanged();
}
FirstActivity.class
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText edit = (EditText) findViewById(R.id.txtItem);
String name=edit.getText().toString();
SecondActivity.list.add(name);
edit.setText("");
SecondActivity.ModifyList();
}
};

Send your ArrayList like this from FirstActivity :
Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
intent.putStringArrayListExtra("Datalist",list);
startActivity(intent);
In secondActivity Recieve the list using :
Intent i = getIntent();
list = i.getStringArrayListExtra("Datalist");
Then display it in your SecondActivitys listview

Android Passing values from one activity to other activity (string) or from one class to another

I have two class Profile.class and Details.class,
In profile class i have used a spinner with values like (ATM,Banking,Personal,Others etc)
and a button (OK).
on clicking ok button it will go to next activity that is details activity where i will be taking some details like-name,description etc.
after filling the details i have given a button (save).
on clicking button save i will be saving the name and description in database but i want to save the profile name also along with details. i am unable to transfer selected spinner text from Profile.class to Details.class
how to transfer?
create.class code
public class Create extends Activity {
public ArrayList<String> array_spinner;
Button button4;
String spinnertext;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.create);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
array_spinner=new ArrayList<String>();
array_spinner.add("ATM");
array_spinner.add("Bank");
array_spinner.add("Mail");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, array_spinner);
adapter.setNotifyOnChange(true);
spinner.setAdapter(adapter);
spinner.setLongClickable(true);
spinner.setOnLongClickListener(new OnLongClickListener(){
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
return false;
}}
);
button4 = (Button)findViewById(R.id.button4);
button4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent4 = new Intent(view.getContext(), Details.class);
startActivityForResult(myIntent4, 0);
myIntent4 .putExtra("key", array_spinner.getSelectedItem().toString());
startActivity(myIntent4);
}
});
}}
details.class code
public class Details extends Activity {
EditText editText4,editText5,editText6;
Button button8,button9,button10;
TextView textView7;
String et4,et5,et6;
//SQLite Database db;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details);
String spinnervalue = getIntent().getExtras().getString("Key");
please kindly explain me what is this "key"?

You can use :
Intent i = new Intent(MainActivity.this,SecondActivity.class);
i.putExtra("YourValueKey", yourData.getText().toString());
then you can get it from your second activity by :
Intent intent = getIntent();
String YourtransferredData = intent.getExtras().getString("YourValueKey");
example
this is what you have to write in your first activity
Intent i = new Intent(getApplicationContext(), Product.class);
i.putExtra("productname", ori);
i.putExtra("productcost", position);
i.startActivityForResult(i,0);
then in your next activity you need to have this code
String productname,productcost;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product);
tv1= (TextView)findViewById(R.id.tv1);
tv2= (TextView)findViewById(R.id.tv2);
Bundle extras= getIntent().getExtras();
if(extras!=null)
{
position = extras.getString("position"); // get the value based on the key
tv1.setText(productname);//use where ever you want
productname = extras.getString("productname"); // get the value based on the key
tv2.setText(productname);
}

First of all take a spinner and provide value to them what you want and then the selected spinner value change it to string value and this string variable will be used in OK button to pass value through use of Intent or Shared preference to take this value to another activity and through there you can use it in database to display this value.

If you want to send data to another activity, you can do it using intent.
Bundle bund = new Bundle();
bund.putString("myKey",name);
Intent intent = new Intent(Profile.this, Detail.class);
intent.putExtras(bund);
startActivity(intent);
Now in Detail class, receive this data in onCreate()
#Override
protected void onCreate(Bundle savedInstanceState) {
.......
String nameReceived = getIntent().getExtras().getString("myKey");
}
I have given the example of passing String to another activity however, you can pass boolean, int, double etc to another activity. See the full list on here

How to reach variables in an activity file from another activity file?

i have two activity files in my code, and the first activity file loads the layout search, and the second file loads layout list. I have a textbox in layout search and enter some text. I want to use this text in my second activity file but i can not reach it since it is in the layout search. How can i do this? Here the first activity file, here there is an EditText item called searchedText, and i want to use it in the second activity file.
public class SearchActivity extends Activity{
public EditText searchedText;
public RadioGroup radioGroup;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
}
public void onStart(){
super.onStart();
searchedText = (EditText) findViewById(R.id.searchText);
Button searchinSearchButton = (Button)findViewById(R.id.searchInSearch);
radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
searchinSearchButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
String searched=searchedText.getText().toString();
Intent myIntent = new Intent(v.getContext(),
SearchListActivity.class);
startActivityForResult(myIntent, 1);
}
});
}
}
And here is the second activity file:
public class SearchListActivity extends Activity{
public DatabaseAdapter db;
public ArrayList<String> myList;
public ListView listview;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
db = new DatabaseAdapter(this);
myList = new ArrayList<String>();
getContacts();
// Example of retrieving tweets of the user "mashable" and adding them to
myList
/*
ArrayList<Tweet> tweets= new ArrayList<Tweet>();
tweets.addAll(Twitter.getTimeline("mashable", 10));
for(Tweet t: tweets){
myList.add(t.username + ": " + t.message + " Tweet id: "+ t.id);
}
*/
printList();
}
public void printList(){
listview = (ListView)findViewById(R.id.contactcListView);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, myList);
listview.setAdapter(adapter);
}
public void getContacts() {
db.open();
Cursor c = db.getContactbyName("y");
if (c.moveToFirst()) {
do {
DisplayContact(c);
} while (c.moveToNext());
}
db.close();
}
public void DisplayContact(Cursor c) {
String entry = "";
// if you add another attribute to your table, you need to change 3 into x
for (int i=1; i<5;i++){
entry += c.getString(i) + "\n";
}
myList.add(entry);
}
}
In this second activity file, you can see the getContacts() method. There, i search by Cursor c = db.getContactbyName("y"); but instead of "y", i want to search whatever user enters the texbox, whic is in the 1st activity file called searchedText. How can i do this?
Thanks

Send the text as an extra in your Intent when you start your second activity.
searchinSearchButton.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
String searched=searchedText.getText().toString();
Intent myIntent = new Intent(v.getContext(),
SearchListActivity.class);
myIntent.putExtra("SEARCH_STRING",searched);
startActivityForResult(myIntent, 1);
}
});
And in your onCreate get the extra. You could use Intent.getStringExtra(String name)
In other words:
mySearched = getIntent().getStringExtra("SEARCH_STRING");
Just make sure to see if anything is null before using it.

EditText Not Reading Input in Android

The problem in EditText is, it is not returning the input value.I am using that input value to check condition.
I am giving the correct input so that i checks the if condition and go to next activity but
it always goes to else condition.
Please check the code below, i had commented the problem.
Here is the snippet
public class BuildWord extends Activity
{
String word = "word";
String finished = "Word Built";
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.buildword);
EditText get = (EditText)findViewById(R.id.dataToSend);
String getdata = get.getText().toString(); //Here i am getting Data from EditText
displayIntentData();
if (getdata.equals("word"))
//Here i am checking with "word" but it goes to else condition.I am typing "word" only
{
findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent(BuildWord.this,MainActivity.class);
intent.putExtra("key", word);
startActivity(intent);
}
});
}
else
{
findViewById(R.id.sendButton1).setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent(BuildWord.this,DropCard.class);
intent.putExtra("key", finished);
startActivity(intent);
}
});
}
}
#Override
protected void onNewIntent(Intent intent)
{
super.onNewIntent(intent);
setIntent(intent);
displayIntentData();
}
private void displayIntentData()
{
Intent intent = getIntent();
TextView tv = (TextView)findViewById(R.id.intentData1);
Bundle extras=intent.getExtras();
if(extras!=null)
{
tv.setText("Data received: "+extras.getString("key"));
}
else
{
tv.setText("No extradata received");
}
}
}

After displayIntentData(); declare String getdata = get.getText().toString();

you are getting the value in the EditText field ("get") immediately after inflating the view. you couldn't have time to enter any text yet, so it is empty. you then check if "getData" contains "word" (it doesn't!) therefore you're hitting the ELSE.

We will get the text when any click event is happened ....
String getdata = get.getText().toString(); //Here i am getting Data from EditText
above code always return empty string ...
try put the code in on click event and process so that you can get the string and compare it easily

You are getting input data right after when the view is being created.
Instead try to take input data inside your click listener