封装代码和UI利器—Fragment(二)

       上期回顾了Fragment技术的来龙去脉，今天我主要是复习学习Fragment的生命周期，学习Fragment 的生命周期应该与Activity的生命周期同时复习，顺便做个比较。

Activity的生命周期方法有7个，而Fragment的生命周期方法多达11个。

上面我画了一张图，直角矩形代表的是Fragment的生命周期的过程，圆角矩形飙到的是Activity的生命周期。

下面给出一个实例

package com.fragmentCyle;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;




public class MyFragment1 extends Fragment{

	@Override
	public void onInflate(Activity activity, AttributeSet attrs,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		Log.d("Fragment1", "onInflate");
		Log.d("Fragment1_onInflate_activity_stringResource", activity.getResources().getString(R.id.action_settings));
		Log.d("fragment1_onInflate_class", attrs.getAttributeValue(null,"class"));
		//无法获得
		Log.d("Fragment1_onInflate_getActivity", String.valueOf(getActivity()));
		Log.d("Fragment1_onInflate_saveInstancesteate", String.valueOf(savedInstanceState));
		super.onInflate(activity, attrs, savedInstanceState);
	}
	
	@Override
	public void onAttach(Activity activity) {
		// TODO Auto-generated method stub
		//无法获得EditText
		Log.d("Fragment_onAttach_activity_Editext", String.valueOf(activity.findViewById(R.id.myEditText)));
		Log.d("Fragment_onAttach_activity_Editext", String.valueOf(getActivity().findViewById(R.id.myEditText)));
		super.onAttach(activity);
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}
	
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		View view = inflater.inflate(R.layout.first_fragment, null);
		Log.d("Fragment_onCreateView_activity_Editext", String.valueOf(getActivity().findViewById(R.id.myEditText)));
		Log.d("Fragment1_onCreateView_EditText", String.valueOf(view.findViewById(R.id.myEditText)));
		return view;
	}
	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		Log.d("Fragment_onViewCreated_activity_Editext", String.valueOf(getActivity().findViewById(R.id.myEditText)));
		Log.d("Fragment1_onViewCrated_EditText", String.valueOf(view.findViewById(R.id.myEditText)));
		super.onViewCreated(view, savedInstanceState);
	}
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		Log.d("Fragment_onActivityCreated_activity_Editext", String.valueOf(getActivity().findViewById(R.id.myEditText)));
		super.onActivityCreated(savedInstanceState);
	}
	
	@Override
	public void onStart() {
		// TODO Auto-generated method stub
		super.onStart();
	}
	@Override
	public void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
	}
	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}
	@Override
	public void onStop() {
		// TODO Auto-generated method stub
		super.onStop();
	}
	@Override
	public void onDestroyView() {
		// TODO Auto-generated method stub
		super.onDestroyView();
	}
	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
	}
	@Override
	public void onDetach() {
		// TODO Auto-generated method stub
		super.onDetach();
	}
}

package com.fragmentCyle;



import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MyFragment2 extends Fragment{

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onActivityCreated(savedInstanceState);
		Log.d("onActivityCreated", "onActivityCreated");
	}

	@Override
	public void onAttach(Activity activity) {
		// TODO Auto-generated method stub
		super.onAttach(activity);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		View view = inflater.inflate(R.layout.second_fragment, null);
		return view;
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
	}

	@Override
	public void onDestroyView() {
		// TODO Auto-generated method stub
		super.onDestroyView();
	}

	@Override
	public void onDetach() {
		// TODO Auto-generated method stub
		super.onDetach();
	}

	@Override
	public void onInflate(Activity activity, AttributeSet attrs,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onInflate(activity, attrs, savedInstanceState);
	}

	@Override
	public void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
	}

	@Override
	public void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
	}

	@Override
	public void onStart() {
		// TODO Auto-generated method stub
		super.onStart();
	}

	@Override
	public void onStop() {
		// TODO Auto-generated method stub
		super.onStop();
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onViewCreated(view, savedInstanceState);
	}

	
}

package com.fragmentCyle;


import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;


public class FragmentCycleActivity extends FragmentActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

错误分析：

引起这个错误的原因在导入了import android.support.v4.app.Fragment;   导入这个包必须继承FragmentActivity .