Develop Reference

How to go to a new activity in ListView?

I have created a ListView and create A ,B and C in the list
now , i want when the user click A ,it led the user to a new activity called D. when he clicks B, led him to new Activity called E,Clicks C and go to Activity F.
what should I do to accomplish that?
here is my code
public class MainActivity extends Activity implements
OnItemClickListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView support_device_list=(ListView)
findViewById(R.id.support_device_list);
support_device_list.setOnItemClickListener(this);
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
--------------------------------------------------------------------------------The new code
is it Like that?
public class MainActivity extends Activity implements
OnItemClickListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView support_device_list=(ListView)
ListView list = (ListView) findViewById(R.id.listview);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if(position==0)
{
Intent in=new Intent(lt18iActivity.this,lt18iActivity.class);
startActivity(in);
}
if(position==1)
{
Intent in=new Intent(YourActivity.this,ActivityB.class);
startActivity(in);
}
if(position==2)
{
Intent in=new Intent(YourActivity.this,ActivityC.class);
startActivity(in);
}
}
});
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

try this
ListView list = (ListView) findViewById(R.id.listview);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(position==0)
{
Intent in=new Intent(YourActivity.this,ActivityA.class);
startActivity(in);
}
if(position==1)
{
Intent in=new Intent(YourActivity.this,ActivityB.class);
startActivity(in);
}
if(position==2)
{
Intent in=new Intent(YourActivity.this,ActivityC.class);
startActivity(in);
}
}
});

set menu item as to aways show + icon

I am enable to set one of the ActionBar menu items as an icon and show it as "showAsAction="always" all I am getting is the overflow menu and a the title of the button instead of the icon. I don't understand what I am doing wrong?
this is the code in the activity:
public class RecipientsActivity extends ListActivity {
private static final String TAG = RecipientsActivity.class.getSimpleName();
protected List<ParseUser> mFriends;
protected ParseUser mCurrentUser;
protected MenuItem mSendMenuItem;
protected ParseRelation<ParseUser> mFriendsRelation;
#Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipients);
getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
getActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public void onResume() {
super.onResume();
mCurrentUser = ParseUser.getCurrentUser();
mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
setProgressBarIndeterminateVisibility(true);
ParseQuery<ParseUser> query = mFriendsRelation.getQuery();
query.addAscendingOrder(ParseConstants.KEY_USERNAME);
query.findInBackground(new FindCallback<ParseUser>() {
#Override
public void done(List<ParseUser> friends, ParseException e) {
setProgressBarIndeterminateVisibility(false);
if (e == null) {
mFriends = friends;
String[] friendNames = new String[mFriends.size()];
int i = 0;
for (ParseUser friend : mFriends) {
friendNames[i] = friend.getUsername();
i++;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(RecipientsActivity.this,
android.R.layout.simple_list_item_checked,
friendNames);
setListAdapter(adapter);
} else {
Log.e(TAG, e.getMessage());
AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
//e.getMesssage = says useful information about the error
builder.setMessage(e.getMessage());
builder.setTitle(R.string.error_title);
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_recipients, menu);
mSendMenuItem = menu.getItem(0);
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.action_send) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
mSendMenuItem.setVisible(true);
}

Your activity is ListActivity. That means that you are using the native API Level 11+ implementation of the action bar, not the appcompat-v7 backport.
Hence, change app:showAsAction to android:showAsAction.

passing value from mainactivity to a listview

Hi everyone I am currently developing an android app, I am having some confusions in the code, I have a main activity in which I store some array values.
I have two xml files(one mainactivity.xml and other the other one is listview.xml)
In main activity.xml there are four switches, when I click any particular switch it should take me to the listview.xml, with a corresponding array displayed on list view by list view adapter. The code is as follows
public class MainActivity extends ActionBarActivity {
ListView l;
Button chem = (Button) findViewById(R.id.button4);
public String[] contentc = {
"Abundance",
"Anxiety",
"Bruxism",
"Discipline",
"Drug Addiction"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
l= (ListView) findViewById(R.id.listview);
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_element, contentp);
chem.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
//DO SOMETHING! {RUN SOME FUNCTION ... DO CHECKS... ETC}
setContentView(R.layout.list);
l.setAdapter(adapter);
}
});
}
#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;
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Intent intent = new Intent(activity2.this, activity1.class);
intent.putExtra("message", message);
startActivity(intent);
In activity1, in onCreate(), you can get the String message by retrieving a Bundle (which contains all the messages sent by the calling activity) and call getString() on it :
Bundle bundle = getIntent().getExtras();
String message = bundle.getString("message")

One Result Activity with many Activities

I have many activities which have 1 resultant activity. Does anyone know how to separate it, the result will display one result from many activity. If i run it it will display result fruitQuestion and AnimalQuestion.
Test.java:
public class Test extends Activity {
Button btnFruitQ,btnAnimalQ;
ToggleButton tb;
public static boolean tbflag;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
btnFruitQ = (Button) findViewById(R.id.btnFruitQ);
btnAnimalQ = (Button) findViewById(R.id.btnAnimalQ);
tb = (ToggleButton) findViewById(R.id.ToggleButton);
btnFruitQ.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
tbflag=tb.isChecked();
startActivity(new Intent(Test.this, FruitQuestion.class));
}
});
btnAnimalQ.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
tbflag=tb.isChecked();
startActivity(new Intent(Test.this, AnimalQuestion.class));
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_test, 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.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
FruitQuestion.java:
public class FruitQuestion extends Activity {
TextView tv;
Button btnNext;
RadioGroup rg;
RadioButton bt1,bt2,bt3;
String Question[]={"HAHA","HAHA2","HAHA3"};
String ans[]={"i1","12","i3"};
String opt[]={"i1","lali","uu","12","hehe","oo","i3","jj","cc"};
int flag=0;
public static int mark,correct,wrong;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fruit_question);
tv=(TextView) findViewById(R.id.tvque);
btnNext=(Button) findViewById(R.id.btnNext);
rg = (RadioGroup) findViewById(R.id.rg);
bt1 = (RadioButton) findViewById(R.id.btn1);
bt2 = (RadioButton) findViewById(R.id.btn2);
bt3 = (RadioButton) findViewById(R.id.btn3);
tv.setText(Question[flag]);
bt1.setText(opt[0]);
bt2.setText(opt[1]);
bt3.setText(opt[2]);
Toast.makeText(this,"Negative Mark : "+Test.tbflag,1000).show();
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RadioButton uans=(RadioButton)findViewById(rg.getCheckedRadioButtonId());
String ansText= uans.getText().toString();
if (ansText.equalsIgnoreCase(ans[flag]))
{
correct++;
}
else
{
wrong++;
}
flag++;
if(flag<Question.length)
{
tv.setText(Question[flag]);
bt1.setText(opt[flag*3]);
bt2.setText(opt[(flag*3)+1]);
bt3.setText(opt[(flag*3)+2]);
}
else
{
if(Test.tbflag)
{
mark=correct-wrong;
}
else
{
mark=correct;
}
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
startActivity(in);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_fruit_question, 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.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
ResultActivity.java:
public class ResultActivity extends Activity {
TextView tv;
Button btnRestart;
StringBuffer sb=new StringBuffer();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
tv=(TextView)findViewById(R.id.tvres);
btnRestart=(Button)findViewById(R.id.btnRestart);
sb.append("Correct Answer : " + FruitQuestion.correct);
sb.append("\nWrong Answer : " + FruitQuestion.wrong);
sb.append("\nFinal Score : " + FruitQuestion.mark);
tv.setText(sb);
FruitQuestion.correct = 0;
FruitQuestion.wrong = 0;
sb.append("Correct Answer : "+AnimalQuestion.correct);
sb.append("\nWrong Answer : "+AnimalQuestion.wrong);
sb.append("\nFinal Score : " + AnimalQuestion.mark);
tv.setText(sb);
AnimalQuestion.correct=0;
AnimalQuestion.wrong=0;
btnRestart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent in=new Intent(getApplicationContext(),Test.class);
startActivity(in);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_result, 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.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

You can use Intent Extras to tell ResultActivity which Activity called it, and display the corresponding results.
Note that you should also re-factor your code so that you're not using static variables in the Activities to store data, you could use SharedPreferences instead.
Just to get you started though, here is what you could do in the short term:
In FruitQuestion, you would have:
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
in.putExtra("question", "fruit");
startActivity(in);
And in AnimalQuestion, you would have:
Intent in=new Intent(getApplicationContext(),ResultActivity.class);
in.putExtra("question", "animal");
startActivity(in);
Then, in ResultActivity, capture the Intent Extra, and show corresponding result:
Bundle extras = this.getIntent().getExtras();
if (extras != null){
String question = extras.getString("question");
if (question.equals("fruit")) {
sb.append("Correct Answer : " + FruitQuestion.correct);
sb.append("\nWrong Answer : " + FruitQuestion.wrong);
sb.append("\nFinal Score : " + FruitQuestion.mark);
tv.setText(sb);
FruitQuestion.correct = 0;
FruitQuestion.wrong = 0;
}
else if (question.equals("animal")) {
sb.append("Correct Answer : " + AnimalQuestion.correct);
sb.append("\nWrong Answer : " + AnimalQuestion.wrong);
sb.append("\nFinal Score : " + AnimalQuestion.mark);
tv.setText(sb);
AnimalQuestion.correct = 0;
AnimalQuestion.wrong = 0;
}
}

Firstly, give your Intent instance a different name. Other than in. You can put extra in intent object and send it to ResultActivity
Like this
Intent intent = new Intent(getApplicationContext(),ResultActivity.class);
intent.putExtra("activityName", "FruitQuestion");
startActivity(intent);
In ResultActivity
Intent intent = getIntent();
String activityName = intent.getStringExtra("activityName");
Check your activityName value and show its results.

I think I understand you, you want to pass some values from A-activity to B-activity.
To pass data between activities, you can use the same intent you are sending.
Here an example:
Intent i = new Intent(this, ActivityA.class);
i.putExtra("key1", value1);
i.putExtra("key2", value2);
startActivity(i);
putExtra method allow pass multiples kinds of value, like boolean, string, integer...
Then, in the another activity, in onCreate method, you can get this value this way:
String save = getIntent().getExtras().getString("key1");
Or
Bundle bundle = getIntent().getExtras();
boolean check = bundle.getBoolean("key2");
I hope it help you :)

Removing item from list on other activity

How can I remove a item from a ListActivity from a button on another Activity, the thing is,
I have this ListActivity:
public class ListaEventos extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
protected void onResume() {
super.onRestart();
republicar();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.lista_eventos, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.criar_evento:
Intent criar = new Intent(this, CriarEvento.class);
startActivity(criar);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void republicar() {
List<DadosEvento> eventos = MySingleton.getInstance().getEventos();
setListAdapter(new ArrayAdapter<DadosEvento>(this, android.R.layout.simple_list_item_1, eventos));
}
#Override
public void onListItemClick(ListView listView, View view, int position, long id) {
DadosEvento clickNumber = MySingleton.getInstance().getEventos().get(position);
Intent intent = new Intent(this, ExibirEvento.class);
Bundle exibirEvento = new Bundle();
exibirEvento.putString("exibirNome", clickNumber.getNome());
exibirEvento.putString("exibirData", clickNumber.getData());
exibirEvento.putString("exibirEnd", clickNumber.getEndereco());
exibirEvento.putString("exibirTel", clickNumber.getTel());
intent.putExtras(exibirEvento);
startActivity(intent);
}
}
Other Activity:
public class ExibirEvento extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exibir_evento);
Intent intent = getIntent();
Bundle exibirEvento = intent.getExtras();
String exibirNome = exibirEvento.getString("exibirNome");
String exibirData = exibirEvento.getString("exibirData");
String exibirEnd = exibirEvento.getString("exibirEnd");
String exibirTel = exibirEvento.getString("exibirTel");
TextView exibir_nome = (TextView) findViewById(R.id.exibirevento_edittext_nome);
exibir_nome.setText(exibirNome);
TextView exibir_data = (TextView) findViewById(R.id.exibirevento_edittext_data);
exibir_data.setText(exibirData);
TextView exibir_end = (TextView) findViewById(R.id.exibirevento_edittext_end);
exibir_end.setText(exibirEnd);
TextView exibir_tel = (TextView) findViewById(R.id.exibirevento_edittext_tel);
exibir_tel.setText(exibirTel);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.exibir_evento, menu);
return true;
}
public void sairExibicao(View v) {
finish();
}
}
Now, on the ExibirEvento is where it shows me the infos about the Party, and there I need a button that removes that item from the List.

Well there are several scenarios that you can follow.
Use startActivityForResult instead of startActivity and then override the onActivityResult method and catch a proper requestCode and result (e. g. RESULT_OK) and delete current item and notifyDataChanged the adapter
Use singelton class, create newInstance, set values, and then refere to it from ExibirEvento
Use the database, and take advantage of ContentProvider and Loader, and pass only the ID of the entry to ExibirEvento
I think that the 3 option is the best way to go for.