getActivity() where it is defined?

Question

I'm very new to android and I'm following this example.

The code says we need to do these steps to get an dialog box:

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

// 2. Chain together various setter methods to set the dialog characteristics
builder.setMessage(R.string.dialog_message)
       .setTitle(R.string.dialog_title);

// 3. Get the AlertDialog from create()
AlertDialog dialog = builder.create();

But where does the getActivity() method is defined?

I can't find that method.

Answer 1

getActivity(); is a method of android Fragment, if you want to show dialog in your activity, just pass this of your activity instead of getActivity().

Answer 2

I had exactly the same problem and finally I found what I actually suspected... Simply add:

dialog.show();

...and voila. There it is. Wonder why this isn't stated in the original example!?

Answer 3

getActivity() is implemented in the Fragment class.

See http://developer.android.com/reference/android/app/Fragment.html

Answer 4

new AlertDialog.Builder() needs Context as input parameter. So try like

AlertDialog.Builder builder = new AlertDialog.Builder(yourActivityName.this);

Answer 5

// 1. Instantiate an AlertDialog.Builder with its constructor

AlertDialog.Builder builder = new AlertDialog.Builder(yourActivityName.this);

// 2. Chain together various setter methods to set the dialog characteristics

builder.setMessage(R.string.dialog_message).setTitle(R.string.dialog_title);

// 3. Get the AlertDialog from create()

AlertDialog dialog = builder.create();

// 4. Show the AlertDialog

dialog.show();

Answer 6

Update android API level 23.

Use getContext() instead of getActivity().