Android UI How to - Life Cycle of a Fragment Example

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Fragments have their own life cycle.

Example

The following code examines the various states experienced by a fragment.

In the res/layout folder, add a new file and name it fragment1.xml. Populate it with the following:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout/*from   w w  w  . j a v  a 2  s .co m*/
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#00FF00"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="This is fragment #1"
    android:textColor="#000000"
    android:textSize="25sp" />
</LinearLayout>

Also in the res/layout folder, add another new file and name it fragment2.xml. Populate it as follows:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout// w ww  .j a v a 2s. co  m
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFE00"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="This is fragment #2"
    android:textColor="#000000"
    android:textSize="25sp" />
</LinearLayout>

In activity_main.xml, add the following code:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:orientation="horizontal" >
/*from www . ja  v  a  2 s.c  o  m*/
    <fragment
        android:name="com.java2s.Fragments.Fragment1"
        android:id="@+id/fragment1"
        android:layout_weight="1"
        android:layout_width="0px"
        android:layout_height="match_parent" />
    <fragment
        android:name="com.java2s.Fragments.Fragment2"
        android:id="@+id/fragment2"
        android:layout_weight="1"
        android:layout_width="0px"
        android:layout_height="match_parent" />

</LinearLayout>

Under the com.java2s.Fragments package name, add two Java class files and name them Fragment1.java and Fragment2.java

Add the following code to Fragment1.java:

// w  w w.j  a  v a2s  . co  m
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {

    Log.d("Fragment 1", "onCreateView");

    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment1, container, false);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    Log.d("Fragment 1", "onAttach");
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d("Fragment 1", "onCreate");
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    Log.d("Fragment 1", "onActivityCreated");
  }

  @Override
  public void onStart() {
    super.onStart();
    Log.d("Fragment 1", "onStart");
  }

  @Override
  public void onResume() {
    super.onResume();
    Log.d("Fragment 1", "onResume");
  }

  @Override
  public void onPause() {
    super.onPause();
    Log.d("Fragment 1", "onPause");
  }

  @Override
  public void onStop() {
    super.onStop();
    Log.d("Fragment 1", "onStop");
  }

  @Override
  public void onDestroyView() {
    super.onDestroyView();
    Log.d("Fragment 1", "onDestroyView");
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    Log.d("Fragment 1", "onDestroy");
  }

  @Override
  public void onDetach() {
    super.onDetach();
    Log.d("Fragment 1", "onDetach");
  }

}

Add the following code to Fragment2.java:

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
// ww w  .j  ava  2 s .co m
public class Fragment2 extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment2, container, false);
  }
}

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