It's part of the articles of lifecycle:
start reading from Understand lifecycle of Activity and Fragment, Introduction.
I try to show the different case in lifecycle of Activity and Fragment in this post. Before I show the code, I show what found in my trial experiment.
case 1:
Close app by HOME, become invisible:- MainActivity.onPause
- MyFragment1.onPause
- MainActivity.onStop
- MyFragment1.onStop
back from closed app:- MainActivity.onRestart
- MainActivity.onStart
- MyFragment1.onStart
- MainActivity.onResume
- MyFragment1.onResume
case 2:
Finished by calling finish() method (press the finish button):- MainActivity.onPause
- MyFragment1.onPause
- MainActivity.onStop
- MyFragment1.onStop
- MainActivity.onDestroy
- MyFragment1.onDestroyView
- MyFragment1.onDestroy
- MyFragment1.onDetach
back from finished:- MainActivity.onCreate
- MainActivity.onCreate / savedInstanceState == null
- MainActivity.onStart
- MyFragment1.onAttach
- MyFragment1.onCreate
- MyFragment1.onCreateView
- MyFragment1.onActivityCreated
- MyFragment1.onStart
- MainActivity.onResume
- MyFragment1.onResume
case 3:
Orientation changed:- MainActivity.onPause
- MyFragment1.onPause
- MainActivity.onStop
- MyFragment1.onStop
- MainActivity.onDestroy
- MyFragment1.onDestroyView
- MyFragment1.onDestroy
- MyFragment1.onDetach
- MainActivity.onCreate
- MyFragment1.onAttach
- MyFragment1.onCreate
- MainActivity.onCreate / savedInstanceState != null
- MainActivity.onStart
- MyFragment1.onCreateView
- MyFragment1.onActivityCreated
- MyFragment1.onStart
- MainActivity.onResume
- MyFragment1.onResume
case 3:
Kill by system
(refer this post to simulate activity killed by system) - MainActivity.onPause
- MyFragment1.onPause
- MainActivity.onStop
- MyFragment1.onStop
- MainActivity.onDestroy
- MyFragment1.onDestroyView
- MyFragment1.onDestroy
- MyFragment1.onDetach
back from killed- MainActivity.onCreate
- MyFragment1.onAttach
- MyFragment1.onCreate
- MainActivity.onCreate / savedInstanceState != null
- MainActivity.onStart
- MyFragment1.onCreateView
- MyFragment1.onActivityCreated
- MyFragment1.onStart
- MainActivity.onResume
- MyFragment1.onResume
The test code is modified version from the post "
Understand lifecycle of Activity and Fragment". To make the main code clear, custom Activity (MyFragmentActivity extends FragmentActivity) and Fragment (MyFragment extends Fragment) were implemented to display status of lifecycle on Toast and log in LogCat.
MyFragmentActivity.java
package com.example.androidfragmenttest;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.Toast;
public class MyFragmentActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
recLifeCycle();
super.onCreate(savedInstanceState);
}
@Override
protected void onStart() {
recLifeCycle();
super.onStart();
}
@Override
protected void onRestart() {
recLifeCycle();
super.onRestart();
}
@Override
protected void onResume() {
recLifeCycle();
super.onResume();
}
@Override
protected void onPause() {
recLifeCycle();
super.onPause();
}
@Override
protected void onStop() {
recLifeCycle();
super.onStop();
}
@Override
protected void onDestroy() {
recLifeCycle();
super.onDestroy();
}
public void recLifeCycle(){
String className = getClass().getSimpleName();
StackTraceElement[] s = Thread.currentThread().getStackTrace();
String methodName = s[3].getMethodName();
Toast.makeText(getApplicationContext(),
className + "." + methodName, Toast.LENGTH_SHORT).show();
Log.i("MYTAG", className + "." + methodName);
}
public void recLifeCycle(String note){
String className = getClass().getSimpleName();
StackTraceElement[] s = Thread.currentThread().getStackTrace();
String methodName = s[3].getMethodName();
Toast.makeText(getApplicationContext(),
className + "." + methodName, Toast.LENGTH_SHORT).show();
Log.i("MYTAG", className + "." + methodName + " / " + note);
}
}
MyFragment.java
package com.example.androidfragmenttest;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
public class MyFragment extends Fragment {
@Override
public void onAttach(Activity activity) {
recLifeCycle();
super.onAttach(activity);
}
@Override
public void onCreate(Bundle savedInstanceState) {
recLifeCycle();
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
recLifeCycle();
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
recLifeCycle();
super.onActivityCreated(savedInstanceState);
}
@Override
public void onStart() {
recLifeCycle();
super.onStart();
}
@Override
public void onResume() {
recLifeCycle();
super.onResume();
}
@Override
public void onPause() {
recLifeCycle();
super.onPause();
}
@Override
public void onStop() {
recLifeCycle();
super.onStop();
}
@Override
public void onDestroyView() {
recLifeCycle();
super.onDestroyView();
}
@Override
public void onDestroy() {
recLifeCycle();
super.onDestroy();
}
@Override
public void onDetach() {
recLifeCycle();
super.onDetach();
}
public void recLifeCycle(){
String className = getClass().getSimpleName();
StackTraceElement[] s = Thread.currentThread().getStackTrace();
String methodName = s[3].getMethodName();
Toast.makeText(getActivity(),
className + "." + methodName, Toast.LENGTH_SHORT).show();
Log.i("MYTAG", className + "." + methodName);
}
public void recLifeCycle(String note){
String className = getClass().getSimpleName();
StackTraceElement[] s = Thread.currentThread().getStackTrace();
String methodName = s[3].getMethodName();
Toast.makeText(getActivity(),
className + "." + methodName, Toast.LENGTH_SHORT).show();
Log.i("MYTAG", className + "." + methodName + " / " + note);
}
}
MainActivity.java
package com.example.androidfragmenttest;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.FrameLayout;
public class MainActivity extends MyFragmentActivity {
static public class MyFragment1 extends MyFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.fragment_layout1, null);
return view;
}
}
FrameLayout fragmentContainer;
Button buttonFinish;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonFinish = (Button)findViewById(R.id.finish);
buttonFinish.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
finish();
}});
fragmentContainer = (FrameLayout) findViewById(R.id.container);
if (savedInstanceState == null) {
// if's the first time created
recLifeCycle("savedInstanceState == null");
MyFragment1 myListFragment1 = new MyFragment1();
FragmentManager supportFragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = supportFragmentManager
.beginTransaction();
fragmentTransaction.add(R.id.container, myListFragment1);
fragmentTransaction.commit();
}else{
recLifeCycle("savedInstanceState != null");
}
}
}
/res/layout/activity_main.xml
<LinearLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:id="@+id/finish"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="finish()"/>
<FrameLayout
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
/res/layout/fragment_layout1.xml
<LinearLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Fragment 1"/>
</LinearLayout>
Download the files.
*
the original chart of lifecycle is taken here.
