SampleFragment.java

package com.dianping.example.fragment;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.dianping.example.fragmentdeveloper.R;

public class SampleFragment extends Fragment {
	Button btn;
	int counter;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.sample_fragment, container, false);
		btn = (Button) v.findViewById(R.id.btn);
		btn.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				btn.setText(String.valueOf(++counter));
			}
		});
		if (savedInstanceState != null) {
			counter = savedInstanceState.getInt("counter");
		}

		btn.setText(String.valueOf(counter));
		return v;
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		super.onViewCreated(view, savedInstanceState);

	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putInt("counter", counter);
	}
}