Prevent dialog dismissal on screen rotation in Android

The best way to avoid this problem nowadays is by using a DialogFragment.

Create a new class which extends DialogFragment. Override onCreateDialog and return your old Dialog or an AlertDialog.

Then you can show it with DialogFragment.show(fragmentManager, tag).

Here's an example with a Listener:

public class MyDialogFragment extends DialogFragment {

    public interface YesNoListener {
        void onYes();

        void onNo();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        if (!(activity instanceof YesNoListener)) {
            throw new ClassCastException(activity.toString() + " must implement YesNoListener");
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
                .setTitle(R.string.dialog_my_title)
                .setMessage(R.string.dialog_my_message)
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ((YesNoListener) getActivity()).onYes();
                    }
                })
                .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ((YesNoListener) getActivity()).onNo();
                    }
                })
                .create();
    }
}

And in the Activity you call:

new MyDialogFragment().show(getSupportFragmentManager(), "tag"); // or getFragmentManager() in API 11+

This answer helps explain these other three questions (and their answers):

• Android Best way of avoid Dialogs to dismiss after a device rotation
• Android DialogFragment vs Dialog
• How can I show a DialogFragment using compatibility package?

// Prevent dialog dismiss when orientation changes
private static void doKeepDialog(Dialog dialog){
    WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
    lp.copyFrom(dialog.getWindow().getAttributes());
    lp.width = WindowManager.LayoutParams.WRAP_CONTENT;
    lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
    dialog.getWindow().setAttributes(lp);
}

public static void doLogout(final Context context){     
        final AlertDialog dialog = new AlertDialog.Builder(context)
        .setIcon(android.R.drawable.ic_dialog_alert)
        .setTitle(R.string.titlelogout)
        .setMessage(R.string.logoutconfirm)
        .setPositiveButton("Yes", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                ...   
            }

        })
        .setNegativeButton("No", null)      
        .show();    

        doKeepDialog(dialog);
    }

If you're changing the layout on orientation change I wouldn't put android:configChanges="orientation" in your manifest because you're recreating the views anyway.

Save the current state of your activity (like text entered, shown dialog, data displayed etc.) using these methods:

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
}

That way the activity goes through onCreate again and afterwards calls the onRestoreInstanceState method where you can set your EditText value again.

If you want to store more complex Objects you can use

@Override
public Object onRetainNonConfigurationInstance() {
}

Here you can store any object and in onCreate you just have to call getLastNonConfigurationInstance(); to get the Object.

Just add android:configChanges="orientation" with your activity element in AndroidManifest.xml

Example:

<activity
            android:name=".YourActivity"
            android:configChanges="orientation"
            android:label="@string/app_name"></activity>