Modify from the last exercise, keep MyFragment.java and fragmentlayout.xml no change.
Create a new /res/layout/fragmentlayout2.xml to define our second fragment.
<?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="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="It's Fragment 2" />
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="center"
android:src="@drawable/ic_launcher"/>
</LinearLayout>
Create MyFragment2.java to implement our second fragment class.
package com.exercise.FragmentTest;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MyFragment2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View myFragmentView = inflater.inflate(R.layout.fragmentlayout2, container, false);
return myFragmentView;
}
}
Modify main.xml, to add buttons to change fragment.
<?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" >
<LinearLayout
android:layout_width="0px"
android:layout_weight="1"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Select Fragment:" />
<Button
android:id="@+id/displayfragment1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Fragment 1" />
<Button
android:id="@+id/displayfragment2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Fragment 2" />
</LinearLayout>
<LinearLayout
android:id="@+id/myfragment"
android:layout_width="0px"
android:layout_weight="3"
android:layout_height="match_parent" />
</LinearLayout>
Modify main activity FragmentTestActivity.java to switch between fragments when button click. You should try to switch between fragments and the BACK key, to see how the fragment transaction work.
package com.exercise.FragmentTest;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class FragmentTestActivity extends Activity{
Fragment fragment;
Button btnFragment1, btnFragment2;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnFragment1 = (Button)findViewById(R.id.displayfragment1);
btnFragment2 = (Button)findViewById(R.id.displayfragment2);
// get an instance of FragmentTransaction from your Activity
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
//add a fragment
MyFragment myFragment = new MyFragment();
fragmentTransaction.add(R.id.myfragment, myFragment);
fragmentTransaction.commit();
btnFragment1.setOnClickListener(btnFragmentOnClickListener);
btnFragment2.setOnClickListener(btnFragmentOnClickListener);
}
Button.OnClickListener btnFragmentOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Fragment newFragment;
// Create new fragment
if(v == btnFragment1){
newFragment = new MyFragment();
}else{
newFragment = new MyFragment2();
}
// Create new transaction
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.myfragment, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}};
}
Download the files.Related article:
- Lifecycle of Fragment: onCreate(), onCreateView() and onPause().
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