Activity与Fragment的生命周期
一、Activity 生命周期
二、Fragment 生命周期
三、对比图
四、测试代码
package com.goso.testapp; import android.app.Activity; import android.app.ListFragment; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; /** * Demonstration of using ListFragment to show a list of items * from a canned array. */ public class FragmentListArray extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.e("HJJ", "Activity &&&& onCreate..."); // Create the list fragment and add it as our sole content. if (getFragmentManager().findFragmentById(android.R.id.content) == null) { ArrayListFragment list = new ArrayListFragment(); getFragmentManager().beginTransaction().add(android.R.id.content, list).commit(); } } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); Log.e("HJJ", "Activity &&&& onStart..."); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.e("HJJ", "Activity &&&& onResume..."); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); Log.e("HJJ", "Activity &&&& onStop..."); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.e("HJJ", "Activity &&&& onPause..."); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.e("HJJ", "Activity &&&& onDestroy..."); } public static class ArrayListFragment extends ListFragment { @Override public void onAttach(Activity activity) { // TODO Auto-generated method stub Log.e("HJJ", "ArrayListFragment **** onAttach..."); super.onAttach(activity); } @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub Log.e("HJJ", "ArrayListFragment **** onCreate..."); super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub Log.e("HJJ", "ArrayListFragment **** onCreateView..."); return super.onCreateView(inflater, container, savedInstanceState); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); Log.e("HJJ", "ArrayListFragment **** onActivityCreated..."); String[] array = new String[]{"C++", "JAVA", "PYTHON"}; setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, array)); } @Override public void onStart() { // TODO Auto-generated method stub Log.e("HJJ", "ArrayListFragment **** onStart..."); super.onStart(); } @Override public void onResume() { Log.e("HJJ", "ArrayListFragment **** onResume..."); // TODO Auto-generated method stub super.onResume(); } @Override public void onPause() { Log.e("HJJ", "ArrayListFragment **** onPause..."); // TODO Auto-generated method stub super.onPause(); } @Override public void onStop() { Log.e("HJJ", "ArrayListFragment **** onStop..."); // TODO Auto-generated method stub super.onStop(); } @Override public void onDestroyView() { Log.e("HJJ", "ArrayListFragment **** onDestroyView..."); // TODO Auto-generated method stub super.onDestroyView(); } @Override public void onDestroy() { // TODO Auto-generated method stub Log.e("HJJ", "ArrayListFragment **** onDestroy..."); super.onDestroy(); } @Override public void onDetach() { Log.e("HJJ", "ArrayListFragment **** onDetach..."); // TODO Auto-generated method stub super.onDetach(); } @Override public void onListItemClick(ListView l, View v, int position, long id) { Log.i("FragmentList", "Item clicked: " + id); } } }
五、测试结果
onCreate过程 01-22 15:30:28.091: E/HJJ(10315): Activity &&&& onCreate... 01-22 15:30:28.091: E/HJJ(10315): ArrayListFragment **** onAttach... 01-22 15:30:28.091: E/HJJ(10315): ArrayListFragment **** onCreate... 01-22 15:30:28.115: E/HJJ(10315): ArrayListFragment **** onCreateView... 01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onActivityCreated... onStart过程 01-22 15:30:28.123: E/HJJ(10315): Activity &&&& onStart... 01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onStart... onResume过程 01-22 15:30:28.123: E/HJJ(10315): Activity &&&& onResume... 01-22 15:30:28.123: E/HJJ(10315): ArrayListFragment **** onResume... onPause过程 01-22 15:31:26.748: E/HJJ(10315): ArrayListFragment **** onPause... 01-22 15:31:26.748: E/HJJ(10315): Activity &&&& onPause... onStop过程 01-22 15:31:27.638: E/HJJ(10315): ArrayListFragment **** onStop... 01-22 15:31:27.638: E/HJJ(10315): Activity &&&& onStop... onStart过程 01-22 15:31:57.537: E/HJJ(10315): Activity &&&& onStart... 01-22 15:31:57.537: E/HJJ(10315): ArrayListFragment **** onStart... onResume过程 01-22 15:31:57.537: E/HJJ(10315): Activity &&&& onResume... 01-22 15:31:57.537: E/HJJ(10315): ArrayListFragment **** onResume... onPause过程 01-22 15:32:47.412: E/HJJ(10315): ArrayListFragment **** onPause... 01-22 15:32:47.412: E/HJJ(10315): Activity &&&& onPause... onStop过程 01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onStop... 01-22 15:32:47.865: E/HJJ(10315): Activity &&&& onStop... onDestroy过程 01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDestroyView... 01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDestroy... 01-22 15:32:47.865: E/HJJ(10315): ArrayListFragment **** onDetach... 01-22 15:32:47.865: E/HJJ(10315): Activity &&&& onDestroy...
明星效应。很简单,在一个领域保持顶尖水平,比在一两个领域保持领先水平和五六个领域保持一般水准都要更有价值、并且收益更好。
有悖常识的真相:让未来更开放的方式,正是专注的去做好一件事情。这个世界上最成功的人,他们在某一领域获得成功之后,可通过经营杠杆进入任何他们想要涉足的领域。而这都得依赖于他们曾极致的专注在做好一件事情上。