Android begins to support fragments from the version 3.0 onwards. In those versions prior to 3.0, we have to use Android Support Library to create fragments. In this article we will create an application which adds a fragment to the main activity at runtime in Android version 2.3 using Android Support Library.
1. Create a new Android Project namely “DynamicFragmentsForLegacy”
Figure 1: New Android Project
2. Select Android Build Target 2.3 for this application
Figure 2: Select Android Build Target
3. Enter application details
Figure 3: Enter Application Details
4. Add Android Support Library
Android supports fragments from the version 3.0 onwards only. Android provide and external support library to use fragments in the versions prior to 3.0. In order to add this library to our project in eclipse, right click “DynamicFragmentsForLegacy”(ProjectExplorer) -> Android Tools -> Add Support Library.
5. res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainActivity!</string>
<string name="app_name">DynamicFragmentsForLegacy</string>
<string name="str_btn_load">Load Fragment</string>
<string name="str_tv_fragment">This is a fragment</string>
</resources>
6. res/layout/hello_fragment_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/str_tv_fragment"
/>
</LinearLayout>
7. src/in/wptrafficanalyzer/dynamicfragmentslegacy/HelloFragment.java
package in.wptrafficanalyzer.dynamicfragmentslegacy;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class HelloFragment extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.hello_fragment_layout, null);
return v;
}
}
8. res/layout/main.xml
<?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" >
<Button
android:id="@+id/btn_load"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/str_btn_load" />
<LinearLayout
android:id="@+id/fragment_container"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
</LinearLayout>
</LinearLayout>
9. src/in/wptrafficanalyzer/dynamicfragmentslegacy/MainActivity.java
package in.wptrafficanalyzer.dynamicfragmentslegacy;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
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;
public class MainActivity extends FragmentActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
OnClickListener listener = new OnClickListener() {
@Override
public void onClick(View v) {
Fragment hello = new HelloFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.fragment_container,hello);
fragmentTransaction.commit();
}
};
Button btnLoad = (Button) findViewById(R.id.btn_load);
btnLoad.setOnClickListener(listener);
}
}
10. Execute the application
Figure 4: Main Activity
- On clicking the button “Load Fragment” of the Figure 4, a fragment will be loaded at in the same activity as shown in the Figure 5.
Figure 5: Main Activity with a dynamically loaded Fragment
11. Download
12. Reference
http://developer.android.com/guide/index.html
I am George Mathew, working as software architect and Android app developer at wptrafficanalyzer.in
You can hire me on hourly basis or on project basis for Android applications development.
For hiring me, please mail your requirements to info@wptrafficanalyzer.in.
My other blogs
store4js.blogspot.com
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