Fragment

首先FragmentActivity类及布局；

public abstract class SingleFragmentActivity extends FragmentActivity {
    protected abstract Fragment createFragment();

    @Override
    public void onCreate(Bundle savedInstanceState ) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = fragmentManager.findFragmentById(R.id.fragmentContainer);
        if (fragment == null){
            fragment = createFragment();
            fragmentManager.beginTransaction().add(R.id.fragmentContainer, fragment)
            .commit();
        }

    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/fragmentContainer"
    tools:context="com.zps.criminalintent.CrimeActivity">

</FrameLayout>

其次fragment类及布局；

public class CrimeFragment extends Fragment{
    public static final String EXTRA_CRIME_ID = "criminalintent.CRIME_ID";
    private Crime mCrime;
    private EditText mTitleField;
    private Button mDateButton;
    private CheckBox mSolvedCheckBox;

    public static CrimeFragment newInstance(UUID crimeId) {
        Bundle args = new Bundle();
        args.putSerializable(EXTRA_CRIME_ID,crimeId);
        CrimeFragment fragment = new CrimeFragment();
        fragment.setArguments(args);
        return fragment;
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //mCrime = new Crime();
        UUID crimeId = (UUID)getArguments().getSerializable(EXTRA_CRIME_ID);
        mCrime = CrimeLab.get(getActivity()).getCrime(crimeId);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_crime, container, false);

        mDateButton = (Button) v.findViewById(R.id.crime_date);
        mDateButton.setText(mCrime.getDate().toString());
        mDateButton.setEnabled(false);
        mSolvedCheckBox = (CheckBox) v.findViewById(R.id.crime_solved);
        mSolvedCheckBox.setChecked(mCrime.isSolved());
        mSolvedCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                mCrime.setSolved(isChecked);
            }
        });
        return v;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/crime_title_label"
    style="?android:listSeparatorTextViewStyle"/>
  

</LinearLayout>

最后activity类继承父类，实例化CrimeFragment；

public class CrimeActivity extends SingleFragmentActivity {

    @Override
    protected Fragment createFragment() {
        UUID crimeId = (UUID) getIntent()
                .getSerializableExtra(CrimeFragment.EXTRA_CRIME_ID);

        return CrimeFragment.newInstance(crimeId);
    }


}