Develop Reference

How to go back from 3rd activity to second activity by back button?

I just started android programming and I created 3 activities.A button in each activity will open another.I can navigate from my 2nd activity back to my first but I can't navigate from my third activity back to my second.Here's what I tried but the app crashes when I click on the back button. I guess it's trying to jump from the third activity to the second. If it helps my second activity's java file is called CountryDetails.java
public class WikiPage extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web);
getSupportActionBar().setTitle(R.string.title_activity_wikipedia_details);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}

Simply call onBackPressed() instead of NavUtils.navigateUpFromSameTask(this)

Remove NavUtils.navigateUpFromSameTask(this);
You should use onBackPressed() only.
Called when the activity has detected the user's press of the back
key. The default implementation simply finishes the current activity,
but you can override this to do whatever you want.
case android.R.id.home:
onBackPressed();
return true;

Use onBackPressed() instead of NavUtils.navigateUpFromSameTask(this) for activity backstake manage

Back button as Menu in fragment

I want to add a back button as menu in the left of the action bar in fragment. But I don't want the back arrow as my icon.
actionBar.setDisplayHomeAsUpEnabled(true);
The above code line gives the back arrow symbol. Instead i want to use some custom image. Also using that custom image should get it back to its previous activity.

I added something like:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
getActivity().onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
It worked for me.

Add this to your theme in styles.xml:
<item name="android:homeAsUpIndicator">#drawable/my_icon</item>
It will override the default icon. By default it uses the following id:
android.R.id.home
You can use this id to navigate back to your previous activity:
View homeView = getActionBar().getCustomView().findViewById(android.R.id.home);
homeView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v)
{
//Go back
}
});
or
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
//Return back to your activity!
return true;
}
return super.onOptionsItemSelected(item);
}
For more information check the official documentation at : https://developer.android.com/training/implementing-navigation/ancestral.html

Dynamic parent activity for Android up \ back navigation in Preferences menu

I've a Preference activity for a options menu in my Android app.
I've enabled the Up \ Back navigation on the ActionBar and I need to come back to the previous activity that called the Options menu.
For the Preference activity, I could use in the manifest:
android:parentActivityName="mypackage.com.MainActivity"
but how come back to other activies ? The Options menu is called from 4 different activities.
public class Prefs extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
ActionBar actionBar = getActionBar();
// Enabling Up / Back navigation
actionBar.setDisplayHomeAsUpEnabled(true);
}
}

Make sure that you have declared the parent activity in the manifest like this...
<activity
android:name="com.myapp.SetPreferenceActivity"
android:parentActivityName="com.myapp.MainActivity"
>
and then make sure to add the case into your onOptionsItemSelected method...
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
//Take me back to the main activity
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
if you prefer to have the up button point to a custom activity, you can just use an intent.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
Intent changeActivity = new Intent(this,OtherActivity.class);
startActivity(changeActivity);
return true;
}
return super.onOptionsItemSelected(item);
}

The default behaviour of the Back button is that it will get you back to the calling activity. The system maintains a back stack of activities while the user navigates the application. Do you need to override this functionality? Please be more specific.

Solved in this way:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
}
return true;
}

How can i set back navigation button in my action bar?

I am using actionBar.setDisplayHomeAsUpEnabled(true); for back navigation functionality but it is not working as properly as i need it and when i am using back button of my phone it works properly.
Is there any way to code on a button such that it work same as back navigation button of phone?

Along with
actionBar.setDisplayHomeAsUpEnabled(true);
or
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
you can try using this in Activity, too:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
So your menu item "Home"'s click will be handled using that.

I know this has been answered, but i always do this in my method when having the same back-button-like capability in another ActionBarActivity.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case android.R.id.home:
finish();
break;
}
return super.onOptionsItemSelected(item);
}
and ofcourse:
actionBar.setDisplayHomeAsUpEnabled(true);
You may/may not used this, its up to you :)

How to use sliding menu toggle() from fragment

In my application I use Sherlock actionbar with sliding menu.
I can use the sliding menu toggle from Sherlock Fragment activity like this:
switch (item.getItemId()) {
case android.R.id.home:
toggle();
break;}
but now I am trying to hide the actionbar and want to use the actionBar menu button from fragments.
I hide the actionbar, but how can I use the toggle() from fragments?
Can anyone give me an idea how can I use android.R.id.home action from fragment instead of fragmentActivity?

Two way to done this:
In your Activity override onOptionsItemSelected and handle home button clicked and call super for other options menu. (new for home the toggle() will be called and other menu options you can handle them in the Fragment)
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
toggle();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
define an interface in your Fragment and implements it on the Activity. Call the interface function on case android.R.id.home in the Fragment, then call toggle() in the Activity.