Develop Reference

OnCreateOptionMenu is never called

I'm not able to dispay Menù in my main Activity and all the other Activities.
This is my main.xml:
<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"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:background="#color/cardview_dark_background">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
card_view:cardBackgroundColor="#color/cardview_light_background">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/articoli"
android:onClick="visualizzaArticoli"
android:background="#null"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Articoli"
android:layout_gravity="center_vertical"
android:layout_marginLeft="50dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
This is my main.java file:
package com.mcsolution.easymanagementandroid.main;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.Toast;
import com.mcsolution.easymanagementandroid.R;
import com.mcsolution.easymanagementandroid.beans.Program;
import com.mcsolution.easymanagementandroid.connection.MyDatabase;
import com.mcsolution.easymanagementandroid.utility.SyncDati;
public class Main extends Activity {
public MyDatabase db;
public ProgressDialog dialog;
public String url="";
private static final Intent SCAN_INTENT = new Intent("com.google.zxing.client.android.SCAN");
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.care_home, menu);
return super.onCreateOptionsMenu(menu);
}
private void apriConnessioneDB(){
db=new MyDatabase(getApplicationContext());
db.open(); //apriamo il db
}
public void visualizzaArticoli(View view){
Intent intent = new Intent(this, com.mcsolution.easymanagementandroid.articoli.viewArticoli.class);
startActivity(intent);
}
}
This is my menu care_home.xml:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/action_settings"
android:orderInCategory="100"
android:title="#string/action_settings"/>
<item
android:id="#+id/action_logout"
android:orderInCategory="100"
android:title="Logout"/>
</menu>
If I try to start my application, I don't have any error but I can't to see MenuBar. I have try to set a debug point into OnCreateOptionMenu method but, the method is never called.
How can I fixed it ?

You need to return true; in onCreateOptionsMenu() as shown in the code below
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.care_home, menu);
return true;
}

Simply use this:
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.care_home, menu);
return true;
}

Your activity class extends Activity, not AppCompatActivity. The default theme for these activities does not include an Action Bar, which is where the menu would live. You will need to add a <Toolbar> to your activity's layout file, and then call setActionBar() from your onCreate() method.
For example, add this as the first child of your top-level <LinearLayout> tag:
<Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
And add this just after you call setContentView() in your onCreate():
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setActionBar(toolbar);
Now you will have an Action Bar in your activity, and so your menu will appear.

You should return true instead of super like this:
#SuppressLint("RestrictedApi")
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
if (menu != null) {
}
return true;
}
Hope it helps.

You have to use both methods on your activity
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}

Programmatically setting SearchView to be open

I have a SearchView in my activity using this code:
import java.util.List;
import android.app.Activity;
import android.app.SearchManager;
import android.app.SearchableInfo;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.widget.SearchView;
import android.widget.TextView;
public class MainActivity extends Activity implements
SearchView.OnQueryTextListener {
private SearchView mSearchView;
private TextView mStatusView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_main);
mStatusView = (TextView) findViewById(R.id.status_text);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
mSearchView = (SearchView) searchItem.getActionView();
setupSearchView(searchItem);
return true;
}
private void setupSearchView(MenuItem searchItem) {
if (isAlwaysExpanded()) {
mSearchView.setIconifiedByDefault(false);
} else {
searchItem.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_IF_ROOM);
}
mSearchView.setOnQueryTextListener(this);
}
public boolean onQueryTextChange(String newText) {
mStatusView.setText("Query = " + newText);
return false;
}
public boolean onQueryTextSubmit(String query) {
mStatusView.setText("Query = " + query + " : submitted");
return false;
}
public boolean onClose() {
mStatusView.setText("Closed!");
return false;
}
protected boolean isAlwaysExpanded() {
return false;
}
}
menu:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/action_search"
android:actionViewClass="android.widget.SearchView"
android:icon="#android:drawable/ic_menu_search"
android:showAsAction="always"
android:title="Search"/>
</menu>
and layout:
<?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="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/status_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal" />
</LinearLayout>
What I want to do is when the Activity is started, I want the SearchView to start off opened. It starts off "closed" like this:
but I want it to be "open" like this:
Anyway I can do this? Thanks

It's at the top of the documentation: http://developer.android.com/reference/android/widget/SearchView.html
setIconifiedByDefault(false)
Edit:
In order to have it collapsible but expanded at the start then programatically expand it in onCreateOptionsMenu with
searchItem.expandActionView();
and you'll probably need
mSearchView.requestFocus();

How to dynamically add user input into a listView within a fragment?

Im trying to add text into a listview within a fragment but i keep getting an error: cannot find symbol method setListAdapter(ArrayAdapter).
I'm using this tutorial as reference but it only shows how to do it within a activity : http://wptrafficanalyzer.in/blog/dynamically-add-items-to-listview-in-android/
Im trying to move this over to a fragment. Can anyone help please i would highly appreciate it? heres my code :
MainActivity:
import android.app.Activity;
import android.os.Bundle;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuItem;
import com.example.fragments.DeleteDialogueFragment;
import com.example.PeopleFragment;
public class MainActivity extends Activity implements PeopleFragment.PeopleFragmentListener, DeleteDialogueFragment.DeleteDialogueListener {
private final String TAG = "MAINACTIVITY";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PeopleFragment())
.commit();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//INTERFACE METHODS
public void deleteCharacter(){
PeopleFragment peopleFragment = (PeopleFragment) getFragmentManager().findFragmentById(R.id.container);
peopleFragment.deleteCharacter();
}
}
PeopleFragment :
import android.app.Activity;
import android.app.DialogFragment;
import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.ActionMode;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import com.example.actionbardemo.R;
import java.util.ArrayList;
import java.util.Arrays;
public class PeopleFragment extends Fragment{
private final String TAG = "PEOPLEFRAGMENT";
private PeopleFragmentListener mListener;
private ArrayAdapter<String> mPeopleAdapter;
private ActionMode mActionMode;
private int mPersonSelected = -1;
/** Items entered by the user is stored in this ArrayList variable */
private ArrayList<String> pList = new ArrayList<String>();
public interface PeopleFragmentListener {
}
public static PeopleFragment newInstance() {
PeopleFragment fragment = new PeopleFragment();
return fragment;
}
public PeopleFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList<String> people = new ArrayList<String>(Arrays.asList(getResources().getStringArray(R.array.people)));
mPeopleAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,people);
// Reference to the button of the layout main.xml
Button btn = (Button) getView().findViewById(R.id.btnAdd);
// Defining a click event listener for the button "Add"
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText edit = (EditText) getView().findViewById(R.id.txtItem);
pList.add(edit.getText().toString());
edit.setText("");
mPeopleAdapter.notifyDataSetChanged();
}
};
// Setting the event listener for the add button
btn.setOnClickListener(listener);
// Setting the adapter to the ListView
setListAdapter(mPeopleAdapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
ListView peopleList = (ListView) rootView.findViewById(R.id.peopleList);
peopleList.setAdapter(mPeopleAdapter);
peopleList.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
if(mActionMode != null){
return false;
}
mPersonSelected = position;
mActionMode = getActivity().startActionMode(mActionModeCallback);
return true;
}
});
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (PeopleFragmentListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement PeopleFragmentListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
//INTERFACE METHODS
public void deleteCharacter(){
mPeopleAdapter.remove(mPeopleAdapter.getItem(mPersonSelected));
mPeopleAdapter.notifyDataSetChanged();
}
public String getToDelete(){
return mPeopleAdapter.getItem(mPersonSelected);
}
//CONTEXTUAL ACTION BAR CALLBACK
private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
// Called when the action mode is created; startActionMode() was called
#Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = mode.getMenuInflater();
inflater.inflate(R.menu.peoplemenu, menu);
return true;
}
// Called each time the action mode is shown. Always called after onCreateActionMode, but
// may be called multiple times if the mode is invalidated.
#Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false; // Return false if nothing is done
}
// Called when the user selects a contextual menu item
#Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.peopleDelete:
Log.i(TAG,mPeopleAdapter.getItem(mPersonSelected));
DialogFragment dialog = new DeleteDialogueFragment();
Bundle args = new Bundle();
args.putString("name",mPeopleAdapter.getItem(mPersonSelected));
dialog.setArguments(args);
dialog.show(getActivity().getFragmentManager(), "DeleteDiaglogueFragment");
mode.finish();
return true;
default:
return false;
}
}
// Called when the user exits the action mode
#Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
}
};
}
activity_main.xml (layout):
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame" />
fragment_main.xml (layout):
<?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="match_parent"
android:orientation="vertical">
<EditText
android:id="#+id/txtItem"
android:layout_width="240dp"
android:layout_height="wrap_content"
android:inputType="text"
android:hint="#string/hintTxtItem"/>
<Button
android:id="#+id/btnAdd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/lblBtnAdd"
android:layout_toRightOf="#id/txtItem"/>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/peopleList"
android:layout_gravity="center_horizontal" />
</LinearLayout>
strings.xml(values):
<string name="app_name">ActionBarDemo</string>
<string name="action_settings">Settings</string>
<string name="hintTxtItem">Enter an item here ...</string>
<string name="lblBtnAdd">Add Item</string>
<string name="txtEmpty">List is empty</string>
<string name="delete_confirm">Are you sure you want to delete</string>
<string name="delete">Delete</string>
<string name="cancel">Cancel</string>
<string-array name="people">
<item>person 1</item>
<item>person 2</item>
<item>person 3</item>
<item>person 4</item>
<item>person 5</item>
<item>person 6</item>
</string-array>

Emulator not displaying image on button click android

Please bear with me on this I'm new to android programming. I was trying to show an image on a button click in android but unfortunately my emulator is not showing the required output. Here is my layout.xml file
<RelativeLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="14dp"
android:text="Button" />
</RelativeLayout>
main_activity.java
package com.example.app1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.widget.ImageView;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
ImageView image;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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;
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
image.setImageResource(R.drawable.optimus);
}
});
}
}
I have included the image file under /res/drawable-mdpi. When I try running on emulator it does not show image on button click. Is there any problem with the code?

In your onCreate() method write this please :
Button theButton = (Button)findViewById(R.id.button1);
theButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
theButton.setBackgroundResource(R.drawable.optimus);
}

Assuming that you have an ImageView called imageView1,
You have to assign it, before using it.
So change this:
#Override
public void onClick(View arg0)
{
image.setImageResource(R.drawable.optimus);
}
to this
#Override
public void onClick(View arg0)
{
image = (ImageView) findViewById(R.id.imageView1);
image.setImageResource(R.drawable.optimus);
}

You have to write onclick method like this code and also you need to call addListenerOnButton method in the onCreate() method
package com.example.app1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.widget.ImageView;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButton();
}
#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;
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
button.setBackgroundResource(R.drawable.optimus);
}
});
}
}

Try This:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/background" <!-- you're adding this here -->
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textView1"
android:layout_below="#+id/textView1"
android:layout_marginTop="14dp"
android:onClick="showImage" <!-- you're adding this here -->
android:text="Button" />
</RelativeLayout>
Then in the .java file...
Package com.example.app1;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.widget.ImageView;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button button;
ImageView image;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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;
}
public void showImage(View view) {
RelativeLayout background = (RelativeLayout) findViewById(R.id.background);
background.setBackgroundResource(R.drawable.optimus);
} /* This is a whole new section of code to replace the onClick listener */
}
Since you're already using the XML Layouts, try to use the built in onClick listener whenever possible. You can do this by naming a function in your .java file called yourFunctionName with a single argument of (View view).
Then, in your XML, you need to point to it by adding android:onClick="yourFunctionName" for the view that needs the onClick method.
Lastly, you never had the image you were referring to actually pointing to anything. You simply said that the object "image" now used "R.drawable.optimus" but that Image was never used! So instead, I just pointed to placing it in the background of your RelativeView. If instead you wanted it in a separate image, you'll have to add an ImageView to the XML file and set the background resource for the ImageView the same way.
Best of luck on learning Android!

How do I create a clickable item in menu to open a new activity?

I have made an app with a lot of buttons and activities. I'm having trouble though understanding how to start a new activity through a button that is in my menu (when the menu button is clicked on phone) (inflatable menu). This is my code for the menu connected to my activity:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="#+id/item1" android:title="#string/menu_home"></item>
</menu>
Here is my activities in Java:
package com.gmail.derekcraigsmith.nanaimobus;
import android.os.Bundle;
import android.app.Activity;
import android.content.ClipData.Item;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;
public class Route1TimesCcMonfriAActivity extends Activity implements
OnMenuItemClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.route1_times_cc_monfri_a);
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.route1_times_cc_monfri_a, menu);
return true;
}
#Override
public boolean onMenuItemClick(MenuItem item) {
// TODO Auto-generated method stub
return false;
}
}

int id = item.getItemId();
switch (id) {
case R.id.your_menu_item_id : {
startActivity(new Intent(start_activity, next_activity));
}
where start activity is your main activity and next_activity is the activity you want to start.
Give a look on my blog here for more info.

activity_main.xml in menu folder
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="#+id/next"
android:title="Next" />
</menu>
In your activity inflate the menu
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId()) //get the id which is an int
{
case R.id.next: // check if its the menu item next selected
// Single menu item is selected do something
// Ex: launching new activity/screen or show alert message
Toast.makeText(MainActivity.this, "Next Selected", Toast.LENGTH_SHORT).show();
startActivity(new Intent(MainActivity.this,secondAct.class));//start activity
break;
default:
return super.onOptionsItemSelected(item);
}
}