Develop Reference

Android menu crashs application

I have the following in my code and I want to switch to this new activity when I select it from the menu, but the app just keeps closing:
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.mi_baas:
startActivity(new Intent("com.my.project.BAAS"));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
Please help, 2 days so far.....

You have to pass context and class which is to be opened.
Your code should be like this.
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.mi_baas:
startActivity(new Intent(getContext(),BAAS.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
Hope it helps:)

Item ID of title ActionBar

look this image:
When you click on the "Action bar" string my app enter in this method:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_search:
openSearch();
return true;
case R.id.action_settings:
openSettings();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
So also it is an item, the problem is that i don't know which id it has.
Where can i get the id of this item ?

android.R.id.home
if you have set
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true)‌​;

Try this:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_search:
openSearch();
return true;
case R.id.action_settings:
openSettings();
return true;
case android.R.id.home:
//here you put your code
Toast.makeText(this, "You click Action Bar", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}

Linking actionbar buttons with Activity in android?

how can I link my setting buttons in the action bar with a another activity.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.about:
about(); // shows a dialogbox
break;
case R.id.settings:
// I want to link this with my setting screen
break;
}
return super.onOptionsItemSelected(item);
}
I linked up my about action bar button with a dialog box but for my settings, I want it to go to another activity. How can I do this? The activity I want to link to is called settings.java

How about this?
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.about:
about(); // shows a dialogbox
break;
case R.id.settings:
startActivity(this, settings.class);
// This doesn't work?
break;
}
return super.onOptionsItemSelected(item);
}

How to find out the String ID of an item in the Menu knowing its decimal value?

I am using android-support-v7-appcompat.
In an activity I want to show in the actionbar the back button.
I do:
public class News extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_news_screen);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(false);
}
}
And:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
System.out.println(item.getItemId()); // 16908332
System.out.println(R.id.home); // 2131034132
System.out.println(R.id.homeAsUp); // 2131034117
switch(item.getItemId())
{
case R.id.home:
onBackPressed();
break;
case R.id.homeAsUp:
onBackPressed();
break;
case 16908332:
onBackPressed(); // it's works
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
If I use numerical filter by id works, but I think that ID is generated by R and therefore can change, is therefore used R.id. . Any idea?

The home/back icon in the actionbar has the id android.R.id.home.
You can look for that id.
The values in android.R.* will never change and are linked statically.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.home:
onBackPressed();
break;
case R.id.homeAsUp:
onBackPressed();
break;
case android.R.id.home:
onBackPressed();
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}

why it don't work when I click back arrow icon?

I set the following code in my activity:
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
#Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
Why it can't work, when i click back arrow icon?

You need implement it by yourself：
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}