fragment的初始化

package com.bignerdranch.android.criminalintent;

import android.os.Bundle;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;

public class CrimeActivity extends FragmentActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_crime);
        FragmentManager manager = getSupportFragmentManager();
        Fragment fragment = manager.findFragmentById(R.id.fragmentContainer);

        if (fragment == null) {
            fragment = new CrimeFragment();
            manager.beginTransaction()
                .add(R.id.fragmentContainer, fragment)
                .commit();
        } 
    }
}

然后在fragment中

 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mCrime = new Crime();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_crime, parent, false);
        
        mTitleField = (EditText)v.findViewById(R.id.crime_title);
         ......
        return v;}